THE FEDERAL DEMOCRATIC REPUBLIC OF ETHIOPIA MINISTRY OF WATER RESOURCES BARO 1 & 2 MULTIPURPOSE PROJECTS Including Genjl Diversion Schome FEASIBILITY STUDY Final Report Volume 4 C Geology and Geotechnics Ground Conditions and Ground Engineering Annex 4 E Annex 4 F Annex 4 G September 2006 NORPLAN Kfl Norconsult ^1 INTERNATIONALTHE FEDERAL DEMOCRATIC REPUBLIC OF ETHIOPIA MINISTRY OF WATER RESOURCES FEASIBILITY STUDY OF THE BARO MULTIPURPOSE PROJECT VOLUME 4 C - GEOLOGY AND GEOTECHNICS GROUND CONDITIONS AND GROUND ENGINEERING FINAL REPORT SEPTEMBER 2006 Date of issue: 14.09.2006 Checked by: Approved by: NORPlANtni Norconsult■ r IVolume 4 A Page i Structure of the Feasibility Report Volume 1 Main Report Volume 1 is the Main Report, a stand-alone volume that gives the reader a complete picture of the recommended project and the main results of the study. Volume 1 starts with an Executive Summary. Details and data sheets of studies and analyses within the various fields (ge ology, hydrology, sediments, simulations, hydraulic analysis, economic analyses, etc.) are given in separate volumes/annexes. Volume 2 Project Drawings of Baro 1 MPP, Baro 2 MPP, and Genji Diversion Series Series A: Ba1: General drawings Baro 1 MPP Series Ba2: Baro 2 MPP • .«• Volume 3 Series Gen: Genji Diversion Project Supporting Documents Part 1 - Various analyses Annex 3 A: Reservoir operation and power production Annex 3 B: Hydrology and sediment transport Annex 3 C: Hydraulic analyses. Optimisation. Annex 3 D: Access roads Annex 3 E: Power system and transmission lines Annex 3 F: Surveying and mapping Annex 3 G: Detailed cost estimate Annex 3 H: Economic and financial analyses Annex 3 I: Genji Diversion - Background studies Annex 3 J: Terms of Reference Volume 4 A Supporting documents Part 2. Geology and Geotechnics. Ground conditions and ground engineering. Report text and drawings Annex 4 A: Rotary core drillings (ARDCO- RODIO JV) Volume 4 B Annex 4 B: Core box photographs Annex 4 C: Field permeability tests Annex 4 D: Test pit logs Volume 4 C Annex 4 E: Laboratory test results (ARDCO RODIO JV) Annex 4 F: Report from geological mapping by Mengesha and Molla. Annex 4 G: Seismic Hazard Assessment at Baro Dam Site (Geophysical Observatory Science Faculty, Addis Ababa University) Volume 5 Environmental Impact Assessment ------------------- “Trilogy -14 September 2006.doc NORPLAN - NORCONSULT - LAHMEYER JV B aro volume---------------------------------------------------------- jn j t|on with Shebelle Engineering and WWDSE assoc aiFederal Democratic Republic of Ethiopia - Ministry of Water Resources Volume 4 C • Annex 4 E Feasibility Study of Baro 1 & 2 Multipurpose Project Page “ Testing of Rock Samples Baro 1, Baro 2 and Genji Frontpage 4 E doc NORPLAN - NORCONSULT - LAH^yER JV in association with Shebelle Engineering and WWDSEP.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT 01566 17/12/97 LABORATORY RESULTS OF ROCK SAMPLES FOR BARO 1, BARO 2, AND 6ENJI HYDROPOWER PROJECTS GEOTECHINCAL INVESTIGATIONS project Consultant Location: Baro 1 and 2 Dam site ARDCO PLC Baro river Rock Compressive Strength Dimension Item. No BH No Depth (m) Diameter (m) Height Im) Unit weight (Kg/m3) Load (KN) Compressive Strength (KN/m2) 1 B1D-7 27.83 0.060 0.120 2748 134.6 48772 2 GJD-1 32.60 0.060 0.125 2822 144 52178 3 B2D-3 34.83 0.060 0.120 2725 155.4 56309 4 GJD-3 28.00 0.047 0.098 2925 87.9 51907 5 GJD-3 9.09 0.047 0.085 2768 88.4 52202 6 GJD-1 8.93 0.060 0.117 2710 234.2 84862 7 B1T-5 76.31 0.050 0.103 2815 116.5 60788 8 B2T-3 58.11 0.060 0.122 2642 189.9 68810 9 B1T-3 150.13 0.050 0.099 2733 202.5 105661 10 B2D-4 6.75 0.060 0.125 2684 223.7 81058 11 B2D-4 24.91 0.059 0.125 2667 145.3 54449 12 B2D-1 36.31 0.060 0.120 2913 162.6 58918 13 B2D-2 36.00 0.060 0.125 1427 215.2 77978 14 GJT-1 39.11 . 0.050 0.107 2805 116.8 60423 15 GJD-3 8.75 0.047 0.099 2738 116.8 68973 16 GJT-1 73.76 0.047 0.101 2798 65.3 38561 17 GJT-1 ’ 36.34 0.050 0.101 2770 111.7 58283 18 GJD-3 28.40 0.047 0.098 2807 74 43698 19 GJT-1 93.64 0.047 0.091 2788 50.5 29821 20 GJT-1 42.49 0.047 0.090 2762 87.7 51789 21 B2D-3 8.54 0.060 0.125 2675 152.3 55186 22 B1D-4 20.60 0.060 0.115 2683 109.3 39605 23 B1D-7 46.86 0.060 0.123 2825 110.2 39931 24 B1D-3 23.44 0.050 0.104 2837 117.8 61466 25 B1D-7 13.87 0.060 0.125 2735 227.3 82362 26 B2T-4 149.45 0.047 0.094 2951 79.3 46828 27 B2T-6 38.73 0.050 0.095 2805 115.6 60318 28 B1T-4 122.10 0.050 0.101 2825 87.6 45708 29 B1T-4 160.86 0.050 0.103 2800 90.4 47169 ADDIS ABABA OCTOBER 5, 2005 30 B1T-2 16.87 0.047 0.094 2693 98.5 58166 31 B1T-2 16.72 0.047 0.080 2754 165.8 97908 ' 32 "" B1T-2 45.18 0.047 0.092 2890 96.4 56926 33 B1T-6 48.31 0.050 0.100 2762 155.8 81294 34 B1T-5 39.30 0.067 0.128 2955 296.6 86189 — 35 B1T-1 43.33 0.047 0.090 2813 111.4 85784 36 ~ B1D-1 44.36 0.050 0.100 2685 37 19306 37 B1D-2 32.80 0.050 0.100 2772 86 44873 hgxBARO1 and 2 Dame Site Geotechnical Investigation Core Samples for Thin Section and Petrographic Analysis. BHNo, B1D-1 B1D-4 B1D-5 B1D-6 B1D-7 B1T-1 Sampled Section 5.97-11.04m 51.33-51.89m 39.30-39.56m 12.33 - 12.99m 28.86- 29.79m 27.83-28.73m 45.96 - 46.86m 42.86- 43.60m B1T-3 I I r BIT-4 B1T-5 B2D-1 B2D-3 B2T-1 B2T-2 B2T-4 64.23 - 65.05m 113.34-113.93m 122.10-123.06 36.63 - 37.40m 16.17-17.40m 8.54-9.19m 21.44-24.33m 72-72.13ra i 97.72- 98.44m B2T-5 8.80 - 9.60m 24.35-24.50m 207.91-210.73m 83.95 -85.60m 9 ta B2T-6 GJD-1 GJD-3 GJT-1 181.00-191.65m 38.73- 39.95m 95.87- 96.18M 9.96-10.52m 9.09 - 9.39m 93.64-93.94mBHNo B1D-3 B1D-1 B1D-1 B1D-6 B1D»6 B2T-4 B2T-4 B2T-4 B2T-4 B2T-4 B2T-4 B2T-1 B1T-4 Depth 23.92 23.66 5.97 12,33 18.76 8.80 98.16 207.19 32.40 24.32 20.96 21.44 16.22 Unit weight! Load Height (Kglm3) I (KN) 0.088 0.097 0.100 0.120 0.120 0.090 2658 2616 2808 2565 2577 3138. 2683 258^ 2774 2850 2472 2550 B2T-2 B2T-3 B1T-5 B2T-1 B2D-1 B2D-1 B2D-2 B1T-3 B1T-3 B1T-3 2676 97.72 43.20 Dimension Diameter 0.050 0.050 0.050 0.060 . 0.060 0.045 0.047 0.047 0.047 0.047 0.047 0.047 0.050 0.047 0.063 — 2122 B1T-5 B1T-6 36.63 36.24 30.14 16.17 20.33 64.23 90.22 113.34 54.34 22.30 0.060 0.047 0.060 0.060 0.054 0.050 0.050 0.050 0.060 0.050 ___ 0.095 0.088 0.095 0.087 0.094 0.095 0.100 0.095 0.126 0.118 0.093 0.118 0.111 0.117 0.095 0.092 0.100 0.120 0.100 2394 2783 2710 2873 2981 3357 2698 2847 2752 2223 2680 GdT-1 73.46 141.24 83.95 0.047 0.047 0.095 0.096 0.094 2707 B2T-5 2811 B2T-5 0.047 2761 B2T-5 181.00 3145 B1D-6 14.10 0.045 0.060 0.090 0.120 2722 Compressive Strength (KN/m2) 26611 24002 42578 61599 71021 49602 46651 10829 7086 19369 8858 34250 96895 49013 32209 16994 32360 58991 90225 63523 64075 43673 42264 45656 39656 53383 30412 46887 50890 30039 57650 Tested by IsavasARfflu and Approved by Date Date 03/10/05 Checked by Abrahan Assefa Date -- 04/10/05,Borehole no. B1D-4 Section 51.33.51.89 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resources Development In.Co. (ARDICO) Sample No. 51.33-51.89m Rock Name: Meta granite pegmatite Hand specimen description: texture. Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT. Lab. No.: 11425/2005 Sample type: core Type of Analysis: Thin section preparation & petrographic analysis.________________________________ pink and light gray in color and fine-very coarse grained Mineral content Abr. Mineral Mode % Grain Size Texture Quartz 20 Hypidioblastic- Xenoblastic 1 Plagioclase 16 Hypidioblastic- Xenoblastic Microcline 15 Xenoblastic Orthoclase 13 Hypidioblastic- Xenoblastic 1 Seri cite 12 Tiny flaky Zeolite 10 Radial fibrous Biotite 9 Flaky Muscovite 5 Flaky Iron-oxide Opaque Trace Xenoblastic Chlorite r Trace Flaky —A ______ /1 (1 Textures and Descriptive notes: Schistose texture. ' Hypidioblastic- Xenoblastic quartz, plagioclase, xenoblastic microcline and flaky biotite displayed Tood parallel alignment Some of the orthoclase changed to seri cite and zeolite. Chlorite started to replace by biotite. X I Trace = <1% Described by: Girma Asen^u-^^fe & Workelul G/K 7y / Checked by: Workelul G/K ^2 Date Completed: 25/09/2005 1Borehole no. B1D*1 Section 5.97-11.04 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept./Proj: Addis Resource Development In.Co. (ARDICO) Originator Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424- 2005PVT Sample No. 5.97-11.04m Lab. No.:l 1424/2005 Rock Name: Epidote-sphene-plagioclase-biotite schist Sample tvDe: Core Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Dark with white spot in color, Coarse-grained texture. ' • Abr. Mineral Mode % Grain Size Texture Orthoclase and Microcline K-feldspar 10 Xenoblastic- Hypidioblastic Quartz 10 Xenoblastic Plagioclase 19 Xenoblastic- Hypidioblastic Hornblende 8 Xenoblastic Biotite 20 Flaky Epidote 10 Xenoblastic Apatite 6 Idioblastic- Hypidioblastic Sphene 12 Idioblastic- Xenoblastic Iron-oxide Opaque 3 Hypidioblastic- Xenoblastic Calcite 2 Xenoblastic Chlorite Trace L C c Flaky Textures and Descriptive notes: Schistose texture.________________________________________________ _ Flaky mica (Biotite) shows strong parallel alignments. Granulated idiblast-hypidioblast apatite. , Hypidio-xenoblast plagioclase, k-feldspar and xenoblast epidote are strained to the schistose plane. On the ground clearly \dsible recrystallization of orthoclase, microcline and quartz along their grain boundaries and within grains. Poikilitic texture is also observed on grains of biotite, hornblende and sphene crystals.________________ _______________j_---------- ------------------------------------ — Trace = <1%_______________ Described by: Girma Asem & Workelul G/K Checked by: Workelul G/K ^Laboratory Date Completed: 17/09/2005Borehole no. B1D-6 Section 12.33 -12.99 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: 1 “ Addis Resources Development In.Co. (ARDICO) Sample No.12.33-12.99 Rock Name: Microcline -plagioclase- biotite schist Hand specimen description: texture. Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Lab. No.: 11427/2005 Sample type: core Type of Analysis: Thin section preparation & petrographic analysis. Gray with white tint in color and medium-coarse grained Mineral content Abr. Mineral Mode % Grain Size Texture Plagioclase 26 Hypidioblastic- Xenoblastic Biotite 26 Flaky Microcline 15 Hypidioblastic- Xenoblastic Muscovite 13 Flaky Quartz 11 Xenoblastic Orthoclase 10 Hypidioblastic- Xenoblastic Sphene 5 Idioblastic-Xenoblastic Iron-oxide Opaque 3 Xenoblastic Epidote 1 Xenoblastic Calcite Trace Xenoblastic Apatite Trace Idioblastic Zircon Trace Idioblastic Textures and Descriptive notes: Schistose Texture._____________________________________________ Xenoblaslic-hypidioblastic plagioclase, microcline, flaky biotite and muscovite make clearly visible Preferred parallel alignment.. Some of the plagioclase grains are altered to muscovite, epidote and calcite.______ Trace = <1% Described by: Girma Asemu & Workelul G/K Checked by: WorkelulG/K Date Completed: 20/09/2005 Laboratory HBorehole no. B1D-5 Section 39.3-39.56 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) [DcpL/Proj^ Addis Resources Development ln.Co. (ARDICO) Originator. Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT Sample No. 3930-39.56 Lab. No.: 11426/2005 Rock Name: Amygdaloidal porphyritic olivine basalt Sample tvne: core Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Dark gray in colour and fine - coarse trained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Plagioclase 38 Anhedral-lath Pyroxene 36 Subhedral-anhedral lron-oxide Opaque 12 Subhedral-anhedral Olivine 9 euhedral-anhedral Calcite 5 anhedrar /*> .. 1 — \ X \ Textures and Descriptive notes: Porphertic Texture.______________________________________________ Phencrysts of subhedral-anhedral pyroxene and euhedral to anhedral olivine lie in the ground mass composed of lath plagioclase and an intergranular pyroxene. The cavities are filled by calcite .Borehole no. B1D-7 Section 27.83 - 28.73 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) I Dept/Proj: I Addis Resources Development In. Co. (ARDICO) ‘ Originator: Ato Aklilti Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. I Sample No.27.83-28.73m Lab. No.: 11429/2005 Sample type: core I RockName: I Meta granite pegmatite Type of Analysis: Thin section preparation & petrographic analysis. | Hand specimen description: Light gray with black spots in color and medium-very very coarse grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Plagioclase 15 Xenoblastic Quartz 24 Hypidioblastic- Xenoblastic Microcline 24 Xenoblastic Biotite 15 Flaky Muscovite 7 Flaky Iron-oxide Opaque 5 Xenoblastic Chlorite Trace Flaky Apatite Trace Idioblast ic Calcite Trace Xenoblastic Epidote Trace Xenoblastic Zeolite 10 Radial-fibrous Textures and Descriptive notes: Schistose texture._________________________________ _______• Hypidioblastic -xenoblastic quartz, xenoblastic Plagioclase, flaky biotite and muscovite reveal schistosity. Plagioclase and microcline recrystallized along the grain boundaries and within the grains. Graphic texture is clearly seen on microcline crystals.Zeolite isdeveloped as the expense of k-feldspar and plagioclase.___________________________________ • fl____________________________ Trace = <1% __________ ’ Described by: Girina Asemu & Workelul G/K Checked by: Workelul G/K Date Completed: 22/09/2005 aye Lemtna (Dr.) / w x 7 0/ ^ic.l S'*Borehole no. B1D-6 Section 28.86 - 29.79 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resource Development In.Co (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Sample No. 28.86-29.79m Rock Name: Meta pegmatite granite Lab. No.: 11428/2005 Sample tvoe: Core Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Pale pinkish to light gray and black in color, coarse - fine grained texture. Mineral content Grain Size Texture Mode % Orthoclase and Microcline K-feldspar 36 Hypidio - xenoblastic Quartz Plagioclase Biotite Muscovite Epidote Sericite Chlorite Calcite Opaque Apatite Sphene Zircon 20 Iron oxide 12 10 5 5 3 2 2 2 2 1 Trace Xenoblastic_________ Hypidio - xenoblastic Flaky_____ Flaky_____ Xenoblastic Tiny flaky Platy______ Xenoblastic Xenoblastic Idioblastic Hypidio - xenoblastic Idioblastic Textures and Descriptive notes: Schistose texture.________________ ._______________________________ Parallel alignment is shown on mica minerals (biotite muscovite) and chlorite. Some grains of_______________ k-feldspar (Orthoclase and microcline) are sericitized. There is a deformation on the felsic minerals (Quarts k-feldspar). Most crystals of mica minerals crystallized alonggrain boundaries.-------------------------------- Biotite is replaced by chlorite and muscovite. Also perthite texture is observed on the section.------------------------ Trace = <1%____________ _ Described by: Girma Ase & Workelul G/K ^Checked by: Workelul G/K Date Completed: 17/09/2005 IIea3Borehole no. B1T-1 Section 42.86 - 43.6 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) 1 Dept/Proj: I Addis Resources Development In.Co. I (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. | Sample No.42.86-43.60m Lab. No.: 11431/2005 Sample type: core I Rock Name: I Orthoclase -plagioclase -biotite schist Type of Analysis: Thin section preparation & petrographic analysis. I Hand specimen description: Light gray and black in color and medium-coarse grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Biotite 35 Flaky Orthoclase 17 Hypidioblastic- Xenoblastic Plagioclase 15 Xenoblastic Quartz 13 Hypidioblastic- Xenoblastic Muscovite 4 Flaky Microcline 5 Xenoblastic Epidote 5 Xenoblastic Sphene 3 Idioblastic-Xenoblastic Calcite 2 Xenoblastic Seri cite 1 Fine Iron-oxide Opaque Trace Xenoblastic Hornblende Trace Idioblastic Apatite Trace Xenoblastic Chlorite Trace Fibrous Textures and Descriptive notes: Schistose texture.___________________;_________________ _ Hypidioblastic- xenoblastic orthoclase, quartz, xenoblastic plagioclase, and flaky biotite show strong parallel alignment. Plagioclase and orthoclase crystals start to break down in to fine calcite and seri cite respectively. Trace = <1%Borehole no. B1D-7 Section 45.96-46.86 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DepL/Proj: Addis Resources Development In.Co. (ARDICO) Rock Name: Hornblende- plagioclase- biotite schist peta^^fc Hand specimen description: ngmator: Aklilu Asefa Lab. No.: 11430/2005 Date Submitted: 16/09/2005 Request No.:11424-2005PVT. e: core Type of Analysis: Thin section preparation & Dark gray in colour and medium-coarse grained texture. Abr. Mineral Mode % Grain Size Texture Biotite 30 Flaky Plagioclase 23 Hypidio blastic- Xenoblastic | Sphene 10 Idioblastic-Xenoblastic | Hornblende 10 Xenoblastic | Quartz 9 Xenoblastic ; Microcline 5 Hypidioblastic- Xenoblastic Orthoclase 5 Hypidioblastic- Xenoblastic 1 Iron-oxide Opaque 5 Idioblastic-Xenoblasti^ |> Epidote 3 Xenoblastic \ K Calcite Trace Xenoblastic Apatite Trace dioblastic J’ Muscovite Trace . iaky ? Seri cite | Trace Fine 1 Textures and Descriptive notes: Schistose texture. Xennhl^in-hvpidiobLtic plagioclase and flaky biotite revealed well developed preferred parallel.. Orientation. h!cnor plagiocfaseand orthoclase seri cifced. Some ilmemte^Twithin the gramsof Sphene crystals, and in other sphene is rimed by ilmenite Trace = <1%-------------------------.------------------- --------------------- F== Described by-: Girina Asemu t Workelul G/K 'Checked by: Workelul G/K I Date Completed: 18/09/2005 Labors liBorehole no. B1T-3 Section 113.34-113.95 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) 1 Dept./Proj: Addis Resources Development In. Co. (ARDICO) Originator: Ato Aldilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT Sample No.113.34-113.93m Lab. No. 11433/2005 Sample type: core Rock Name: Quartz -orthoclase -epidote- biotite schist Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Light gray and black in color and fine-coarse grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Biotite 24 Flaky Epidote 15 Xenoblastic Orthoclase 15 Hypidioblastic- Xenoblastic Quartz 12 Xenoblastic Plagioclase 10 Hypidioblastic- Xenoblastic Sphene 10 Idioblastic-Xenoblastic Iron-oxide Opaque 9 Hypidioblastic- Xenoblastic Hornblende 5 Xenoblastic Apatite Trace Idioblastic Calcite Trace Xenoblastic Microcline Trace Xenoblastic [ L C Textures and Descriptive notes: Schistose texture._____________________________________________ Hypidioblastic -xenoblastic plagioclase, orthoclase, xenoblastic epidote, and flaky biotite appear to define schistosity .Plagioclase and orthoclase recrystallized along the grain boundaries._____________ Sphene is rimed by i Trace = <1% , Described by: Girma Ase & Workelul G/Kireholeno. B1T-3 Section 64.23 - 65.05 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DcpL/Proj: Addis Resource Development In.Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-200SPVT. Sample No. 64.23-65.05m Lab. No.: 11432/2005 Sample type: Core Rock Name: Biotite-zeolite-k-feldspar schist Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: grained texture. Pale pinkish - light gray and black in color, Coarse-fine Abr. Mineral Mode % Grain Size Texture Orthoclase and Microcline 30 Xenoblastic- Hypidioblastic Zeolite 15 Radial-fibrous Quartz 13 Xenoblastic Biotite 12 Flaky Plagioclase 10 Hypidioblastic - Xenoblastic Muscovite 8 Flaky ’ Epidote 3 Xenoblastic Sphene 3 Idioblastic- Xenoblastic Apatite 2 Idioblastic • Sericite 2 Tiny flaky Chlorite 1 Platy Iron-oxide Opaque 1 Xenoblastic Zircon Trace Idioblastic Textures and Descriptive notes: Schistose texture._________________________________ _______________ Mica minerals show preferable parallel alignment k-feldspar (microcline and orthoclase) is strongly changed to r»dml- fibrous zeolite crystals and also beginning of minor sericitization over it._________________ Some of the biotites replaced by muscovite and chlorite.________________ _____________________________ Trace =* <1% Described by: Girina Asemu & Workelul G/K ( 'Checked by: Workelul G/K ^Labors Date Completed: 18/09/2005Borehole no. B1T - 5 Section 36.63 - 37.40 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resource Development In.Co. (ARDICO) Sample No. 36.63-37.40m Rock Name: Originator Ato Aklilu Asefa Lab. No.: 11435/2005 Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Sample type: Core Type of Analysis: Thin section preparation Actinolitic- hornblende -plagioclase -biotite schist________&___ petr___________________ ographic analysis, Hand specimen description: ' Gray with pale pinkish gray in color, course - fine grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Biotite 20 Flaky Actinolitic Hornblende 13 Relict Plagioclase 17 Hypidioblast ic OrthoclaseA Microcline K-feldspar 10 Hypidioblastic Apatite 5 Idioblastic Sphene 7 Xenoblasic-hypidioblastic Chlorite 1 Platy Zircon Trace Idioblastic Serpentine 2 Fibrous Sericite 1 Tiny flaky Iron oxide Opaque 10 Xenoblastic-hypidioblastic Calcite 2 Xenoblastic Quartz 10 Xenoblastic Epidote 2 Xenoblastic-Idioblastic Textures and Descriptive notes: Schistose texture, _____________________ Biotite and actionolitic hornblende are showing preferable parallel alignment. Hypidio-xenoblastic Plagioclase and k-feldspar (microcline and orthoclase) are strained onschistose nhn . RHH e actinolitic hornblende altered to fibrous serpentine. Some of the opaque minerals rimed bvsphene Crystal’s poikilitic texture observed on actinolitic hornblende and biotite grains. ---------------- ------------ lescribed by: Girma Asem &WorkelulG/K hecked by: elul G/K Date Completed: 17/09/2005Bo^ehoJeno. Borehole no. B1T - 4 Section 122.1 -123.06 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore anlP Dcpt./Proj: Addis Resources Development In. Co. (ARDICO) Sample No.122.10-123.06m Rock Name: Orthoclase quartz plagioclase biotite schist Hand specimen description: -coarse grained texture. Originator: Ato Aklilu Asefa Lab. No. :11434/2005 ■pate Submitted: 16/09/2005 Request No.:11424-2005PVT Sample type: core Type of Analysis: ThinSio^eparcitkm & petrographic analysis. 1 Abr. Mineral MIL Mode % icmi vvui Grain Size -- Texture 1 Biotite 20 Flaky 1 Plagioclase 20 Xenoblastic ; Quartz 18 Hypidioblastic - Xenoblastic 1 Orthoclase 14 Hypidioblastic- Xenoblastic 5 Sphene JO Idioblastic- hypidioblastic Iron-oxide Opaque 6 Xenoblastic f Muscovite 5 Flaky .... Epidote 5 Xenoblastic F' Hornblende 1 Xenoblastic • Calcite 1 Xenoblastic | Apatite Trace Idioblastic \ Chlorite Trace 7 ibrous ; I Textures and Descriptive notes; Schistose texture.__________________________ Hypidioblastic -xenoblastic quartz, orthoclase, xenoblastic plagioclase, flaky biotite clearly show parallel orientation ■ Orthoclase recrystallized along the grain boundaries. Trace = <1% Described by: Girina Asemu &WorkelulGZKBorehole no. B2D-3 Section 8.54-9.19 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept./Proj: Addis Resources Development In.Co. (ARDICO) Originator: Ato Akiilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT. Sample No.8.54-9.19m Lab. No.: 11437/2005 Sample type: core Rock Name: Meta granite pegmatite Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Dark gray with white tint in color and very very coarse texture. Mineral content Abr. Mineral Mode % Grain Size Texture Plagioclase 25 Hypidioblastic- Xenoblastic Microcline 22 Xenoblastic Biotite 20 Flaky Quartz 10 Xenoblastic Iron-oxide Opaque 8 Hypidioblastic- Xenoblastic Sphene 7 Idioblastic-Xenoblastic Orthoclase 5 Hypidioblastic- Xenoblastic, Muscovite 3 Flaky Calcite Trace Xenoblastic ..'Ji Chlorite Trace Flaky ' Zircon Trace Idioblastic ■— C-- L — . 1 z Textures and Descriptive notes: Schistose texture.____________________________________________________________ Xenoblastic-hypidioblastic plagioclase, Xenoblastic microcline and flaky biotite exhibited noticeable parallel alignment. Plagioclase strongly altered to fine-grained Seri cite and calcite._________________________________ Perthite texture is clearly observed, sphene rimed by ilmenite crystals._________________________________________ Trace = <1% Described by: Girma Ase & Workelul G/K f- Checked by: Workelul G/K Date Completed: 18/09/2005 &Borehole no. B2D -1 Section 16.7-17.4 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resource Development In.Co. (ARDICO) Sample No. 16.17-17.4m Rock Name: Amygdaloidal Porphyritic basalt Hand specimen description: Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Lab. No.: 11436/2005 Sample type: Core Type of Analysis: Thin section preparation & petrographic analysis.____________________________________ Gray in color, coarse - very fine-grained texture. Abr. Mineral Texture Mode % Grain Size Plagioclase 40 Tabular, lath Augite Pyroxene 38 Anhedral Iron oxide Opaque 12 Euhedral - anhedral Calcite C- 10 Anhedral / f \ '**■**/ 1 .L_ Textures and Descriptive notes: Porphyritic texture. Tabular large crystal of plagioclase and pyroxenes are phenocrysts in intergranular groundmass of Pyroxene, hth plagioclase and euhedral-anhedral iron oxide. Fractures and cavities are filled with calcite. Described by; Girina Asem & Worketui G/K Checked by: Workelul G/^ Date Completed: 17/09/2005' ___ pr-5 GeologicalBorehole no. B2T-2 Section 72.0-72.13 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept./Proj: Addis Resource Development In.Co. (ARDICO) Sample No. 72-72-73m Rock Name: Sphene-k-feldspar-plagioclase biotite schist Hand specimen description: texture. Originator: Ato Aklilu Asefa Lab. No.: 11439/2005 Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Sample type: Core Type of Analysis: Thin section preparation & petrographic analysis. Black and light gray in color, course -medium grained Mineral content Abr. Mineral Mode % Grain Size Texture Orthoclase and Microcline K-feldspar 15 Xenoblastic- Hypidioblastic Quartz 10 Xenoblastic Plagioclase 17 Xenoblastic- Hypidioblastic Calcite 2 Xenoblastic Muscovite 5 Flaky Sericite 2 Tiny flaky Apatite 5 Idioblastic- Hypidioblastic Zircon Trace Idioblastic Iron-oxide Opaque 5 Idioblastic- Xenoblastic Biotite 27 Flaky Epidote 8 Xenoblastic Hornblende 3 Xenoblastic Chlorite 1 Platy Textures and Descriptive notes: Schistose texture._______________________________________________ ___________ Biotite crystals are showing preferable parallel orientations. Idioblastic-xenoblastic sphene,__________________________ xenoblastic epidote, k-feldspar are strongly strained to the schistose plane. Large crystals of_________________________ microcline break down in to small once(recrystallized).Perthite texture is also visible on k-feldspar. Micro fractures over the Surface of Described by: Girma Asem & Workelul G/K iffilspars are filled with calcite. ^Checked by: Workelul G/K Date Completed: 18/09/2005 Laboratory Headi lorehole no. B2T -1 Section 21.44-24.33 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DepL/Proj: Addis Resources Development In.Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT Sample No.21.44-24.33m Lab. No.l 1438/2005 | Sample type: core Rock Name: Type of Analysis: Thin section preparation & Seri cite —microcline- plagioclase -quartz schist petrographic analysis._______________________________________ Hand specimen description: grained texture. Pale pinkish and gray in color and fine-medium Abr. Mineral Mode % Grain Size Texture Quartz 20 Xenoblastic Plagioclase 19 Hypidioblastic- Xenoblastic Microcline 17 Hypidioblastic- Xenoblastic Seri cite 13 Tiny flaky Orthoclase 12 Hypidioblastic- Xenoblastic Muscovite 2 Flaky Biotite 9 Flaky Iron-oxide Opaque 8 Xenoblastic Chlorite Trace Flaky \ L ZL Textures and Descriptive notes: Schistose texture, Hypidioblastic- xenoblastic plagioclase, microcline, xenoblastic quarto and tiny flaky seri cite show well defined parallel alignment. Recrystallization is clearly visible on the crystals of plagioclase, quartz and k-feldspars.__________________ ____________________ C_____________________________________ Trace = <1% ' $ Described by: Girma Asemu & Workelul G/K \ Checked by: Workelul G/K Date Completed: 25/09/2005i Borehole no. B2T - 4 Section 8.8 - 9.6 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) 1 Dept./Proj: | Addis Resource Development In.Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2605 Request No.: 11424-2005PVT. I Sample No. 8.80-9.60m Lab. No.: 11441/2005 Sample type: Core 1 Rock Name: 1 Amygdaloidal Porphyritic basalt Type of Analysis: Thin section preparation & petrographic analysis. 1 Hand specimen description: gray in color, very fine- coarse grained texture. Mineral content Abr. Mineral Texture Mode % Grain Size Plagioclase 40 Tabular, Lath Augite Pyroxene 33 Anhedral Calcite 10 Anhedral Iron-oxide Opaque 12 Anhedral Volcanic glass 5 / 1r n / | Textures and Descriptive notes: Porphyritic texture, | Groundmass is mainly composed of lath plagioclase, granular anhedral pyroxenes, opaque minerals | (Iron-oxide) and calcites. The groundmass also contains fractures and cavities filled with calcite grains Phenocrysts of large tabular plagioclase and cavity filled large crystals of calcite are developed in the groundmass.________________ Trace = <1%________________ Described by: Girina Asemi & Workelul G/K Checked by: Workelul G/K Date Completed: 17/09/2005•rehole no. B2T - 2 Section 97.72-98.44 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resources Development In.Co. (ARDICO) Sample No. 97.72-98.44 Rock Name: Orthoclase -plagioclase- biotite schist Hand specimen description: Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT. Lab. No.: 11440/2005 Sample type: core Type of Analysis: Thin section preparation & petrographic analysis. ___________________________________ Light gray and black in color and medium grained texture. Abr. Mineral Mode % Grain Size Texture Biotite 25 Flaky Plagioclase 20 Xenoblastic Orthoclase 14 Hypidioblastic -Xenoblastic Sphene 10 Idioblastic-Xenoblastic Quartz 10 Xenoblastic J Hornblende 10 Xenoblastic Microcline 5 Xenoblastic Lron-oxide Opaque 5 Xenoblastic Epidote 1 Xenoblastic Calcite Trace Xenoblastic • Apatite Trace ldioblastic Muscovite Trace Flaky Seri cite Trace Fine Textures and Descriptive notes: Schistose texture. Xenoblastic plagioclase hypidioblastic- xenoblastic orthoclase, xenoblastic hornblende and flaky jiotite have strong schistosity .Plagioclase and orthoclase begin to change to calcite and sen cite Respectively. Ilmenite crystals grow along the rim and within the grains of sphene____________________ Trace = <1% Described by: Girma Asem: & Workelul G/K Checked by: Workelul G/K Date Completed: 24/09/2005Borehole no. B2T - 4 Section’07.91 -210.73 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) 1 Dept./Proj: I Addis Resource Development In.Co. (ARDICO) Originator: Ato Aklilu Asefe Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. I Sample No. 207.91-210.73m Lab. No.: 11443/2005 Sample type: Core 1 Rock Name: I Meta granite pegmatite Type of Analysis: Thin section preparation & petrographic analysis. | Hand specimen description: Pale pinkish and pale gray yellow in color, very very 1 Coarse grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Microcline and Orthoclase K-feldspar 44 Xenoblastic- Hypidioblastic Quartz 25 Xenoblastic Plagioclase 15 Xenoblastic- Hypidioblastic Calcite 7 Xenoblastic Muscovite 5 Flaky Sericite 3 Tiny flaky Apatite 1 Idioblastic- Hypidioblastic Zircon Trace Idioblastic Iron-oxide Opaque Trace Idioblastic I f V 1 zzt ---- 1--------- Textures and Descriptive notes: Granoblastic texture.________________________________________________________ Xenoblastic-hypidioblastic K-feldspar (Orthoclase and Microcline), becoming sericitized.___________________________ Fractures continiously crossing along grain boundaries and within crystals of plagioclases as vein lets are completely filled by calcite grains. Perthite and graphitic texture is observed in the section._______________________ I Ther is a clear deformation along cleavages of plagioclases and microcline.______________________________ Trace = <1% Described by: Girma Asemj & Workelul G/K Checked by: Workehil G/K Date Completed: 17/09Z2005 T “t ”’ gX'»' 1Borehole no. B2T-4 Section 24.35 - 24.5 m » Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept./Proj: Addis Resources Development In. Co. (ARDICO Sample No. 2435-24.50 Rock Name: Biotite- plagioclase- hornblende schist Hand specimen description:_______________ texture grained. Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.ll424-2005PVT Lab. No.l 1442/2005 | Sample type: core Type of Analysis: Thin section preparation & petrographic analysis.__________ _________ _____ Pale pink and black in color and medium-coarse Mineral content Abr. Mineral Mode % Grain Size Texture I Hornblende 25 Xenoblastic £ Plagioclase 22 Hypidioblastic- Xenoblastic 1 Biotite 18 Flaky 1 Quartz 10 Xenoblastic Ls Orthoclase 10 Hypidioblastic- Xenoblastic? | Calcite 8 Xenoblastic ' Epidote 5 Xenoblastic Sphene 1 Idioblastic- Xenoblastic Iron-oxide Opaque 1 Xenoblastic • Chlorite Trace Fibrous Apatite Trace Idioblastic Muscovite Trace Flaky Textures and Descriptive notes: Schistose texture. Hypidioblastic xenoblastic plagioclase, orthoclase, xenoblastic quartz, hornblende and flaky biotite crystals show strong parallel orientation. Calcite crystals grow along.the schistose plane.____________________ Poikiloblastic texture is seen on large crystals of hornblende.. Trace = < 1% Described by: Girma Asemiu^X< fcWorkelulG/K V - - ------ Checked by: Workelul G/K Date Completed: 24/09/2005 1 AjiSontory Hea<P'j\Borehole no. B2T-5 Section 181.00-191.65 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) I DepLZProj: Addis Resources Development In.Co. (ARDICO) Sample No.18L00-191.65m Rock Name: Hornblende- plagioclase- quartz- biotite schist Hand specimen description: texture. Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT Lab. No.: 11445/2005 Sample type: core Type of Analysis: Thin section preparation & petrographic analysis. Dark gray in colour and medium-coarse grained in Mineral content Abr. Mineral Mode % Grain Size Texture Biotite 20 Flaky Quartz 19 Hypidioblastic- Xenoblastic Plagioclase 17 Hypidioblastic- Xenoblastic Hornblende 15 Xenoblastic Epidote 13 Xenoblastic Orthoclase 10 Hypidioblastic- Xenoblastic Sphene 5 Idioblastic-Xenoblastic Iron-oxide Opaque 1 Xenoblastic Calcite Trace Xenoblastic Apatite Trace Idioplasmic 1 f ------------- L------------ L I Textures and Descriptive notes: Schistose texture.__________________________________________________ Xenoblastic-hypidioblastic quartz, plagioclase, Xenoblastic epidote, hornblende and flaky___________________________ green biotite show good parallel alignment. Some of the plagioclase changed to calcite and epidote. On granular quartz and plagioclase visible clear strained. Trace = <1 % lescribed by: Girma Asem & Workelul G/K Checked by: Workelul G/K Date Completed: 18/09/2005 E LaboraBorehole no. B2T - 5 Section 83.95 - 85.6 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resources Development In. Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Sample No.83.95-85.60m Lab. No.: 11444/2005 Sample type: core Type of Analysis: Thin section preparation & Hornblende -quartz —plagioclase- biotite schist petrographic analysis. Hand specimen description: texture. Dark gray and black in color and fine to medium grained Abr. Mineral Mode % Grain Size Texture Biotite 25 Flaky Plagioclase 20 Xenoblastic Quartz 15 Hypidioblastic- Xenoblastic Hornblende 12 Xenoblastic Orthoclase 10 Hypidioblastic- Xenoblastic Epidote 10 Xenoblastic Iron-oxide Opaque 5 Xenoblastic Calcite 1 Xenoblastic Sphene 1 Idioblastic-Xenoblastic Muscovite 1 Flaky Chlorite Trace Flaky Apatite Trace Idioblastic Seri cite Trace Fine Textures and Descriptive notes: Schistose texture.__________________________________________ Hypidioblastic- xenoblastic quartz, orthoclase, xenoblastic plagioclase, flaky biotite and Xenoblastic hornblende exhibited well developed schistosity. Plagioclase grains begin to alter in to fine grains of calcite.________ Trace = <1% Described by: Girma Asem & Workelul G/K Checked by: Workelul G/K Date Completed: 24/09/2005Borehole no. B2T-6 Section 95.87 - 96.18 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples)Borehole no. B2T - 6 Section 38.73 - 39.95 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resources Development In.Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424-2005PVT Sample No38. 73-39.95m Lab. No.: 11446/2005 Sample type: core Quartz-hornblende- plagioclase- biotite schist Hand specimen description: Type of Analysis: Thin section preparation & petrographic analysis. I Dark gray in color and medium grained texture. Abr. Mineral Mode % Grain Size Texture Biotite 20 Flaky ; Plagioclase 20 Hypidioblastic- Xenoblastic 1 Quartz 15 Hypidioblastic- Xenoblastic 1 Hornblende 15 Xenoblastic Chlorite 10 Flaky i Iron-oxide Opaque 10 Idioblastic- Xenoblastic Orthoclase 5 • Hypidioblastic- Xenoblastic 1 Epidote 5 Xenoblastic S Sphene Trace Xenoblastic Apatite Trace Idioblastic ;; Calcite Trace Xenoblastic J ----------------------------------------------- fc Textures and Descriptive notes: Schistose texture. Hypidioblastic -xenoblastic plagioclase, xenoblastic hornblende, flaky green biotite and chlorite crystals they show an appearance well developed strong parallel orientation(schistosity)._______________________________ Poikiloblastic texture is observed that is in large hornblende grains enclosgd quartz, biotite, chlorite and opaque minerals.______________ Trace = <1 %___________________ Described by: Girma Asemu & Workelul G/K becked by: Workelul G/K Date Completed: 21/09/005Borehole no. GJD - 3 Section 9.09 - 9.39 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) 1 Dept/Proj: I Addis Resource Development In.Co. (ARDICO) Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.: 11424- 2005PVT. | Sample No. 9.09-9.39m Lab. No.: 11449/2005 Sample type: Core Rock Name: Muscovite-biotite-quartz- k-feldspar schist Type of Analysis: Thin section preparation & petrographic analysis. Hand specimen description: Light gray in color, Coarse-fine grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Orthoclase and Microcline K-feldspar 35 Xenoblastic- Hypidioblastic Quartz 24 Xenoblastic i Plagioclase 8 Xenoblastic- Hypidioblastic I I Sericite 3 Xenoblastic Biotite 13 Flaky Muscovite 10 Flaky Apatite 1 Idioblastic- Hypidioblastic Sphene Trace Idioblastic- Xenoblastic Iron-oxide Opaque 3 Xenoblastic -Hypidioblastic Calcite 2 Xenoblastic Chlorite 1 Flaky Zircon Trace Idioblastic Textures and Descriptive notes: Schistose texture.________________________________________________ ________ K-feldspar (microcline and orthoclase) are deformed and recrystallized. Quartz crystals strained to schistose plane. Muscovite and biotite show parallel alignment. Some of the biotites replaced by Chlorite and muscovite. Inclusions of calcite are visible on plagioclases. Trace = <1% Described by: Girma Asemu & Workelul G/K T Checked by: Workelul G/K Date Completed: 19/09/2005torehole no. GJD -1 Section 9.96 -10.52 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept./Proj: Addis Resources Development In.Co. (ARDICO) Sample No.9.96-10.52m Rock Name: Meta granite pegmatite Hand specimen description: coarse grain texture. Originator: Ato Aklilu Asefa Date Submitted: 16/09/2005 Request No.:11424-2005PVT. Lab. No.: 11448/_____________ 2005 Sample type: core___________ Type of Analysis: Thin section preparation & petrographic analysis._______________ Light gray and black in color and medium-very very Abr. Mineral Mode % Grain Size Texture Orthoclase 28 Hypidioblastic- Xenoblastic 1 Plagioclase 27 Hypidioblastic- Xenoblastic Quartz 25 Hypidioblastic- Xenoblastic / Microcline 8 Xenoblastic f Biotite 5 Flaky !i Muscovite 5 Flaky Calcite 1 Xenoblastic j Seri cite 1 Fine ? • Chlorite Trace Fibrous ‘ Iron-oxide Opaque Trace Xenoblastic ” Apatite Trace Idioblastic Textures and Descriptive notes: Schistose texture. Hypidioblastic- xenoblastic quartz, plagioclase, orthoclase, flaky biotite and muscovite show____________________________ parallel orientation .Plagioclase and orthoclase start to alter in to fine calcite and seri cite respectively. Some biotite crystals are replaced by chlorite . Graphic textures are observed on K~feldspars. Trace = <1% nzz Described by: Girma Aseqw*^j^^£, Checked by: Workelul G/K & Workelul G/K Xabora Date Completed: 25/09/2005 'D/nrvFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 C - Annex 4 E Pageiv Testing of Soil Samples Baro 1 Frontpage Annex 4 E.doc NORPLAN - NORCONSULT - LAHMEYER JV in association with Shebelle Engineering and WWDSEBorehole no. GJT -1 Section 93.64 - 93.44 m Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Addis Resources Development In.Co. (ARDICO) Sample No.93.64-93.94m Rock Name: Meta granite pegmatite Hand specimen description: coarse grained texture. Originator: Ato Aklilu Asefa Lab. No.: 11450/2005 Date Submitted: 16/09/2005 Request No.: 11424-2005PVT. Sample type: core Type of Analysis: Thin section preparation & petrographic analysis.______________ Light gray and pink in color and medium- very very Abr. Mineral Mode % Grain Size Texture Microcline 22 Hypidioblastic- Xenoblastic Quartz 18 Hypidioblastic- Xenoblastic | Plagioclase 16 Xenoblastic Biotite 15 Flaky j Orthoclase 8 Xenoblastic 1 Epidote 7 Xenoblastic | Muscovite 5 Flaky £ Hornblende 3 Xenoblastic i • Sphene 2 Idioblastic ? Calcite 2 Xenoblastic '■ Seri cite 2 Fine Apatite Trace Idioblastic Chlorite Trace Fibrous J Zircon Trace Idioblastic Iron-oxide Opaque | Trace Xenoblastic '■ Textures and Descriptive notes: Schistose texture. Hypidio blastic-xeno blastic micro cline, quartz, xeno blastic plagioclase, and flaky biotite, show parallel orientation. Microcline crystals recrystallizd along the grain boundaries. Plagioclase grains altered to fine calcite crystals._______________ _______________ __ —£2----------------------------------------------------------- Trace = <1 %4—------------------------------------------------------------------------------------- ---------------------------------------------- Described by: Girina Asem & Workelul G/K Checked by: Workelul G/K Date Completed: 23/09/2005 -^5° &eoWP.O.Box 40036 TEL 420616, 420601 FAX (251-1) 420153 W.O.N° = 01950 Date = 29/02/98 Project :• Baro hydropower project Client :■ ARDCO PLC Location :■ Baro 1 (Dam site) Test :■ Various tests Object :■ Soil samples TEST RESULTS 1. Atterberg limits Item N° BH N° Depth (m) Liquid limit (%) ... Plastic limit (%JL Plasticity index (% ) 1 2 3 4 5 6 7 8 9 B1-NTP-Q4 B1-NTP-D4 B1-NTP-D5 B1-NTP-Q1 B1-NTP-Q2 B1-NTP-Q3 B1-NTP-Q5 B1-NTP-Q5 B1-NTP-Q4 1.75-2 4-4.25 2.55-2.8 1.55 2.40 3.10 2.80 3.10-3.35 2.00 55.70 63.90 59.50 45.90 37.90 NP 63.10 64.30 54.50 32.28 43.37 45.69 17.07 26.15 NP 43.03 39.71 44.73 23.42 20.53 13.81 28.83 11.75 NP 20.07 24.59 9.77 2. Grain size analysis Nine graphs for the grain size distribution are drawn and attached herewith.ARbCO TeL 251-1-5183 85 Fax; 251-1-517877 FOB 4360, Addis Ababa, Ethiopia Ref.No. AR/AA2554/05 ROblO Geotechnics (Pty) Ltd TeL (11) 3101040 Fax: (11)3101342 POB 714, Johannesburg, S. Africa Date: 27th December, 2005 NORPLAN-NORCONSULT-LAHMEYER JV Holtevegen 4 P. O. Box 280 1401 Ski, NORWAY Attn: Mr. Jan Atle Roti Dear Sirs, Subject: - Laboratory Test Results Please find attached laboratory test results from Baro 1 and 2 dam site. 1. ASR test on 4 rock samples B1D6, B1T2, Bl T5, and Baro 2 Quarry. 2. Atterberg limits of nine samples - Barol Test Pit. 3. Grain size analyses of nine samples - Barol Test Pit. 4. UCS tests on twelve samples - Barol Test Pit. 5. Permeability tests on eight samples - Barol Test Pit. 6. Moisture content and unit weight on six samples - Barol Test Pit. 7. Direct shear test on two samples — Barol Test Pit. 8. Compaction test on line samples - Barol Test Pit. 9. Tri axial (CU) tests on four samples - Barol Test Pit. 10. One Dimensional Consolidation tests on five samples Barol. These results represent the last patch required to be submitted by us as per our contract agreement. Sincerely, Omer Mohamed Getta DirectorW.O/Proj. No 01950 Date 27/02/96 Sample ID: Gs-6/98/433 P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: Baro -1 Dam site ARDCO PLC Baro1 Description: Brown silty clay with little sand TP/BH Depth (m) B1-NTP-O5 (U0SS) 2.55 - 2.8 GRAIN SIZE DISTRIBUTIONW.O/Proj. No Date 01950 27/02/98 ISample ID: Gs-6/9 8/432 • 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: Description: Baro -1 Dam site ARDCO PLC Baro -1 Brown silty clay with little sand TP/BH Depth (m) B1-NTP-O4 (U0SS) 4.00 • 4.25 [Specific gravity | 2.68 | GRAIN SIZE DISTRIBUTION Tested by: Anlev abebe Date : . Checked by: 9/3/98 Abraham As Date: 26/03/98W.O/Proj. No Date 01W0 27/D2/98 Sample ID: Gs^9e/429 I P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: Description: Baro -1 Dam site ARDCO PLC Baro -1 Light brown clayey sand with some silt GRAIN SIZE DISTRIBUTION TP/BH Depth (m) ei-NTP-Q2(_BSl Tested by: Dato : . Chocked by: Date: Anlev abebe 9/3/98 Abraham Asse 26/03/98-— W.O/Proj. No Date 01950 27/02/98 ISample ID: I Gs-6/98/437?] P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Baro *1 Dam site Consultant ARDCO PLC Location: Baro -1 Description: Light brown clayey sand with silt TP/BH B144TP.Q1 (LBS) Depth (m) 1-85 | Specific gravity I GRAIN SIZE DISTRIBUTION |-------------------------------------------- ------------- ----------------------W.O/Proj. No 01950 Date 27/02/98 I Sample ID: | Gs-&W36 | . P;?J?°X 40036 TeL 420616-420601 FAX <251-1) 42 01 53 materials testing department and FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: • Description: Baro -1 Dam site ARDCO PLC Baro -1 Brown sandy clay with some silt TP/BH Depth (m) B1-NTP-Q4 (LBS) GRAIN SIZE DISTRIBUTION [Specific gravity | Tested by: Date : .. . Checked by: Date: Aniey abebe 9/3/98 Abraham As 26/03/98W.O/Proj, No Date 01950 J 27/02/98 ’ ISample ID: Gs-6/98/430 MATERIALS TESTINgTeVaRtTeNT^d'51'1’ 01 “ FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: Baro -1 Dam site ARDCO PLC Baro -1 Description: Light greyish silty sand with little clay GRAIN SIZE DISTRIBUTION TP/BH B1-NTP-Q3 (LBS) Depth (m) 3.10 (Specific gravity | 2.75 "]W.O/Proj. No 01950 Date 27/02/98 Sample ID: Gs-6/98/43« P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Consultant Location: Description: Baro -1 Dam site ARDCO PLC Baro -1 Brown clayey silt with little sand TP/BH Depth (m) Bl-NTP-O5(ieS) GRAIN SIZE DISTRIBUTION [Specific gravity | 2.81 | Cobble Gravel Size Sand Size Coarse Fine Grained Fine 0.0001 Tested by: Date : Checked by: Date*. Anley abebe 9/3/98 /J Abraham Ass e/a 26/03/98 V " ■■Ka■gr-------- W.O/Proj. No 01950 zf Date 27/02/98 P.O Ray XAnoe (Sample ID: | Gs-6/98/43i | foundation investigation departement project Consultant Location: Description: Baro -1 Dam site ARDCO PLC Baro -1 Dark brown silty clay with sand GRAIN SIZE DISTRIBUTION TP/BH B1-NTP-Q4 (UBSS) Depth (m) 1.75-2.00 [Specific gravity | 2.53 | 1 t I Tested by: Date : Checked by: Date: Anlev abebe 9/3/98 Abraham Ass 26/03/98 Jit -3. UCS Item N° BH N° Sample type Depth (m) Test Condition UCS ( Kg/m2) 1 2 3 4 5 6 7 8 9 10 11 12 B1-NTP-D4 B1-NTP-D4 B1-NTP-D5 B1-NTP-D5 B1-NTP-Q1 B1-NTP-Q2 B1-NTP-Q3 B1-NTP-Q5 B1-NTP-Q5 B1-NTP-Q5 B1-NTP-Q4 B1-NTP-Q4 UBSS UBSS UBSS UBSS LBS LBS LBS LBS UBSS UBSS UBSS UBSS 4-4.25 4-4.25 2.55-2.80 2.55-2.80 1.55 2.40 3.10 2.80 3.10-3.35 3.10-3.35 1.75-2.00 1.75-2.00 Undisturbed Recomputed Undisturbed Recompacted Recompacted Recompacted Recompacted Recompacted Undisturbed Recompacted Undisturbed Recompacted 26.00 17.61 39.00 16.21 176.00 337.00 285.00 443.00 25.00 963.00 17.00 19.52 4. Permeability Item N° BH N° Sample type Depth (m) Test Condition Permeability K ( Cm/Sec ) 1 2 3 4 5 6 7 8 B1-NTP-D4 B1-NTP-D4 B1-NTP-D5 B1-NTP-Q1 B1-NTP-Q2 B1-NTP-Q3 B1-NTP-Q5 B1-NTP-Q4 UBSS UBSS UBSS LBS LBS LBS LBS UBSS 4-4.25 4-4.25 2.55-2.80 1.55 2.40 3.10 2.80 1.75-2.00 Undisturbed Recompacted Undisturbed Recompacted Recompacted Recompacted Recompacted Recompacted 6.26x10-7 1.20x10-8 4.20x10-8 7.22x10*7 7.54x10-7 6.32x10-7 4.43x10-7 5.34x10-8W.O/Proj. No 01950 fir Date 27/02/98 Y I Sample ID: | Gs-6/98/43Fn 420616----4-2--0--6-0--1----FAX (251 1)42 01 53 MMAATTEERRIIAALLSS TTEESSTTIINNGG DDEEPPAARRTTMMEENNTT AANNDD FFOOUUNNDDAATTIIOONN IINNVVEESSTTIIGGAATTIIOONN DDEEPPAARRTTEEMMEENNTT project Consultant Location: Description: Baro -1 Dam site ARDCO PLC Baro -1 Brown clayey silt with some sand TP/BH Depth (m) 81-NTP-Q5 (USSS) 3.10-3.35 GRAIN SIZE DISTRIBUTION [Specific gravity | Grain Size (mm) Tested by: Date : Checked by: Date:W.O/Proj. No Date 01950 27/02/88 | Sample ID: | D-8/9a/169"~| P.O. Box 40036 Tel. 420616-420801 FAX (261-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT DIRECT SHEAR TEST RESULT Project Baro -1 Dam site Client ;• ARDCO PLC Location Baro Object Soil Sample Tost Type Consolidated Undrlned 1. SPECIMEN DATA TP /BH N° B1-NTP-Q4 (UBSS) Sample No Depth (m) 1.76-2.00 Sample condition Recompacted Initial height (mm) 20.00 Specimen Size (mm) 60x60x20 1 Initial area (Cm ) 36.00 3 Initial volume (cm ) 72.00 initial Weight (gm) 124.18 3 Bulk density (gm/cm ) 1.725 Final dry Weight (gm) 96.74 3 Dry density (gm/cm ) 1.330 Moisture content (%) 29.71 Specific gravity 2.53 Remark Normal stress (KN/m ) x 100 200 300 C (KN/m ) 1 0( Degrees) 1 J r Hear stress (KN/m ) 92 107 142 64 U1Moisture content and Unit weight Item N° BH N° Sample type Depth (m) Test Condition Moisture content (%) Unit weight (KN/m ) 3 1 2 3 4 5 6 B1-NTP-D4 B1-NTP-D5 B1-NTP-Q5 B1-NTP-Q5 B1-NTP-Q4 B1-NTP-Q4 UBSS UBSS UBSS LBS UBSS LBS 4-4.25 2.55-2.80 3.10-3.35 3.10-3.35 1.75-2.00 2.00 Und Und Und Recom Und Recom 41.48 44.07 47.76 30.50(omc) 16.87 22.44(opc) 1615 1650 1564 2062( com) 1667 2101 (com) 6. Direct shear Item N° BH N° Sample type Depth (m) Test Condition Cohesion C ( KN/m ) 2 Angle of Internal friction 0 ( Degrees ) 1 2 B1-NTP-Q4 B1-NTP-Q5 UBSS LBS 1.75-2.00 2.80 Recom Recom 64 67 14 13 Note The necessary graphs for direct shear test result are attached herewith 7. Modified Compaction Nine graphs for the Modified Compaction test result are drawn and attached herewith h r & £KL- t ‘? • '. '’*** X /*> fr- // 1 d - #P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT ProjectBaro-1 Dam site Client > ARDCO PLC Location:- Baro-1 COMPACTION TEST Sample No W.O.No 01950 Date : 27/02/98 B1-NTP-D4(UBSS) Description:- Soil sample Type of Compaction :- Modified 3 Maximum Dry Density (Kg/m ) Depth (m) Natural Moisture Content (%) 1487 Optimum Moisture Content (%) 4.00-4.25 4.48 32.75 Dry Density Vs Moisture Content 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 4Q 42 44W.O/Proj. No Date 01950 27/02/98 [Sample ID: | 0-6/95/168^ -------420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT DIRECT SHEAR TEST RESULT Project :• Baro-1 Dam site Client ARDCO PLC Location Baro - 1 Object Sol! Sample Teat Type Consolidated Undrined 1. SPECIMEN DATA TP /BH N° B1-NTP-Q5 (LBS) Depth (m) Sample No 2.80 Initial height (mm) Sample condition 20.00 Recompacted Initial area (Cm*) Specimen Size (mm) 36.00 60x60x20 Initial Weight (gm) 3 Initial volume (cm ) 126.42 72.00 Final dry Weight (gm) 3 Bulk density (gm/cm ) 98.17 1.756 3 Dry density (gm/cm ) Moisture content (%) 28.78 1.363 Specific gravity 2.81 Remark :• 2 Normal stress (KN/m ) 100 200 300 2 C (KN/m ) 0( Degrees) 2 Shear stress (KN/m ) 91 109 137 67 13 /V'WMi'WrfnjWJP.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT ProjectBaro-1 Dam site Client ARDCO PLC Location:- Baro-1 COMPACTION TEST W.O.No 01950 Date : 27/02/98 Description:- Soli sample Type of Compaction :- Modified 3 Maximum Dry Density (Kg/m ) Sample No Depth (m) B1-NTP-Q1(LBS) 1.55 Natural Moisture Content (%) 0.84 1825 Optimum Moisture Content (%) 15.0048 46 FAX (251-1) 42 01 53 ATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT W.O.No Date 01950 27/02/98 reject: * ‘ftcr.t >o cation Baro-1 Dam site ARDCO PLC Baro-1 COMPACTION TEST Sample No B1-NTP-D5(UBSS) Description:- Soil sample Type of CompactionModified Maximum Dry Density (Kg/n?) Depth (m) Natural Moisture Content (%) 1545 Optimum Moisture Content (%) 2.55-2.80 2.75 28.24 Dry Density Vs Moisture Content 1475 S' 1450 Tested by Getachew Haile Date 06/03/98 fi Checked bv: Abraham Assfffa Date 9/3/98 JP.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT W.O.No 01950 Date : 27/02/98 Project > . Client Location:- Baro-1 Dam site ARDCO PLC Baro-1 COMPACTION TEST Description:- Soil sample Type of Compaction :• Modified 3 Maximum Dry Density (Kg/m ) Sample No Depth (m) B1-NTP^Q3(LBS) 3.10 Natural Moisture Content (%) 1.39 1854 Optimum Moisture Content (%) 14.25 Dry Density Vs Moisture Content Tested by :• Getachew Haile Date :• 06/03/98 , Checked bv: Abraham Asset V- ?s Date . 9/3/98~T.T Project :• Baro-1 Dam site Client ARDCO PLC Location:- Baro-1 Description:- Soil sample Type of Compaction Modified 3 Maximum Dry Density (Kg/m ) W.O.No 01950 Date : 27/02/98 COMPACTION TEST Sample No Depth (m) B1-NTP-Q2(LBS) 2.40 Natural Moisture Content (%) 0.73 1969 Optimum Moisture Content (%) 12.08o4 c ik pONBYKUOTIOfJ DMBION too. P.O. Box 40038 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT W.O.No 01950 Date : 27/02/98 Project Client Location: - Baro-1 Dam site ARDCO PLC Baro-1 COMPACTION TEST Description:- Soil sample Type of Compaction Modified 3 Maximum Dry Density (Kg/m ) Sample No Depth (m) B1-NTP-Q4(UBSS) 1.75-2.00 1610 Natural Moisture Content (%) Optimum Moisture Content (%)4 tu » ------------ CM? N»Tn WQTtQJM DWHON HO a P.O. Box 40036 Tel. 42 06 13-16 66 47-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT W.O.No Date 01950 27/02/98 Project Client Location: Baro-1 Dam site ARDCO PLC Baro-1 COMPACTION TEST Sample No B1-NTP-Q Description:- Soli sample Depth (m) Type of Compaction Modified Natural Moisture Cont ent (%) 4(LBS) 2.00 5.60 3 Maximum Dry Density (Kg/m ) Optimum Moisture Co ntent (%) 22.44 Dry Density Vs Moi sture Content Tested byNapoleon & Date 08/03/98 Checked by: Abraham As <• Date 9/3/98 * DeolS^ ■—P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project > Baro-1 Dam site Client :- ARDCO PLC Location:- Baro-1 COMPACTION TEST W.O.No Date 01950 27/02/98 Description:- Soil sample Type of Compaction :- Modified 3 Maximum Dry Density (Kg/m ) Sample No Depth (m) B1-NTP-Q5(UBSS) 3.10-3.35 1601 Natural Moisture Content (%) Optimum Moisture Content (%) 5.60 29.00 Tested by :• Napoleon & Abraha Date :• 08/03/98 Checked bv: Abraham Ass Date 9/3/98 by •4>*DateG 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT W.O.No 01950 Date : 27/02/98 Project :• Client :• Location: Baro-1 Dam site ARDCO PLC Baro-1 COMPACTION TEST Description:- Soil sample Type of Compaction :- Modified Maximum Dry Density (Kg/m ) Sample No Depth (m) B1-NTP-Q5(LBS) 2.80 Natural Moisture Content (%) 5.60 3 1580 Optimum Moisture Content (%) 30.50 Tested by :• Napoleon & Ab Date :• 08/03/98 Checked by: Abraham Asse Date 9/3/98P.O.Box 40036 TEL 420616, 420601 FAX (251-1)420153,400621 MATERIALS TESTING DEPARTMENT W.ON° '01950 Date:- 29/02/98 Project :Baro hydro power project Client : ARDCO PLC Location: Baro 1 (Dam site) Test Type: Triaxlal(CU) Object : Soil sample SPECIMEN DATA TP /BH N° B1-NTP-D4 Sample N° Depth (m) 4.00-4.25 sample condition UBSS Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm ) 1 11.34 Initial volume (cm ) 3 86.15 Initial Weight (gm) 145 Bulk density (g/cm ) 3 1.683 Final dry Weight (gm) 104 Dry density (g/cm ) 3 1.207 Moisture content (%) 39.42 P . R . Factor (KN/div) 0.0022 Chamber pressure. (KN/m2) fe) 100 200 300 C (KN/m ) 2 0 (Degrees) Deviator Stress, (a aj) (KN/m2) r 252 324 444 35 23 Pore pressure (KN/m2) 16 30 80 Approved^ Tested by :-lsayas Demlle/y Date 19/12/05 Checked by :-Abraham As/af, Date >19/12/05 ILinear shrinkage & organic matter content Item N° BH N° Sample type Depth (m) Linear Shrinkage (%) 1 2 3 4 5 6 7 8 B1-NTP-Q4 B1-NTP-D4 B1-NTP-D5 B1-NTP-Q1 B1-NTP-Q2 B1-NTP-Q3 B1-NTP-Q5 B1-NTP-Q4 Organic matter content (%) LBS UBSS UBSS LBS LBS LBS UBSS UBSS 2.00 4-4.25 2.55-2.80 1.55 2.40 3.10 3.10-3.35 1.75-2.00 - 8.77 3.51 5.26 4.91 0 - 8.50 11.08 11.32 6.65 8.24 6.06 8.58 9.33 9. Tri axial (CU) The necessary graphs for tri axial test are attached herewith 10. One-Dimensional consolidation The necessary data sheet for Time —settlement and void ratio — pressure curves are attached herewith Tested by Mulu, Getachew Date 06/12/05 Checked by Abraham Assefa/ Date 06/12/055 XP.O.Box 40036 TEL 420616, 420601 FAX (251-1) 420153,400621 MATERIALS TESTING DEPARTMENT W.O N° '01950 Date:- 29/02/98 Project :Baro hydro power project Client : ARDCOPLC Location: Baro 1 ( Dam site) Test Type: Triaxial ( CU) Object : Soil sample SPECIMEN DATA TP /BH N° B1-NTP-Q1 Sample N° Depth (m) 1.55 sample condition LBS Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm ) 1 11.34 Initial volume (cm ) 1 86.15 Initial Weight (gm) 163 Bulk density (g/cm ) 1 1.892 Final dry Weight (gm) 132 Dry density (g/cm’) 1.532 Moisture content (%) 23.48 P. R . Factor (KN/dlv) 0.0022 Remark Chamber pressure, (KN/m2) P =1/2 (, q = 1/2 (o;- o3) 100 <Oj) 200 300 C (KN/m ) 2 0 (Degrees) Deviator Stress, (G|- Oj) (KN/m2) 410 580 764 47 30 Pore pressure (KN/m2) 30 66 98 y = 0.5728X ♦ 47 348 Normal Stress(KN/m ) 2 Tested by >lsayas Demile^ Date > 19/12/05 Checked by :-Abraham As$f Date >19/12/05P.O.Box 40036 TEL 420616, 420601 FAX (251-1) 420153,400621 MATERIALS TESTING DEPARTMENT W.ON" '01950 Data:- 29/02/98 Project: Baro hydro power project Client : ARDCO PLC Location: Baro 1 ( Dam site) Test Type: Triaxlal ( CU) Object : Soil sample SPECIMEN DATA TP /BH N° B1-NTP-D5 Sample N° Depth (m) 2.55-2.80 sample condition UBSS Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm ) 1 11.34 Initial volume (cm’) 86.15 Initial Weight (gm) 158 Bulk density (g/cm ) 3 1.834 Final dry Weight (gm) 137 Dry density (g/cm ) 3 1.590 Moisture content (%) 15.33 P . R . Factor (KN/dlv) 0.0022 Remark P =1/2 (p^o,) , q = 1/2 (Ol- a,) Chamber pressure, (KN/m2) («j) 100 200 300 C (KN/m ) 2 0 (Degrees) Deviator Stress » (O|- Pj) (KN/m2) 300 372 480 49 24 Pore pressure (KN/m2) 32 58 120 Tested by :-lsayas Demile^. Date :• 22/12/05 tj Checked by :-Abraham Aspra Date :-23/12/05^j_P.O. Box 40036 Tel. 42 06 16,42 06 01 FAX (255-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVIST1GATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) Specimen data BEFORE TEST Proj. hT: 01960 Date: 28/02/98 BH N° : 01 wtp-o4(ubs8) DEPTH: 4-oo-Lifi Weight of sample & Ring (gm) 264.63 Specific Gravity (GJ 2.68 Weight of Ring (gm) 112.29 Sample Diameter (D) (mm) 75.00 Weight of sample (gm) 142.34 Sample Thickness (HJ (mm) 20.00 Weight of Dry Sample (gm) 101.98 Area (A) (cm ) 2 44.18 Weight of Initial Moisture (gm) ' 40.36 Volume (V) (cm ) 3 88.37 Initial Moisture content (MJ (%) 39.68 Bulk Density (pj (gm/cm ) 3 1.611 Dry Density (pj (gm/cm ) 3 1.154 |Initial Void Ratio : e = (G./p )-1 Qd | 1.322] (Height of Solids: H H«/(1+e ) (mm) | ao c 8.612) (initial Saturation : S = (M *GJ/e (%) | o00 80.211 AFTER TEST Weight of Sample + Ring +Can (gm) 318.00 Over all settlement (mm) 3.800 Weight of Dry Sample + Ring +Can (gm) 284.50 Volume change (cm ) 3 16.79 Weight of Ring + Can (gm) 182.62 Final Volume (cm ) 3 71.58 Weight of Wet Sample (gm) 136.48 Final Bulk Density (gm/cm ) 3 1.893 Weight of Dry Sample (gm) 101.98 Final Dry Densslty (gm/cm ) 3 1.426 Weight of Final Moisture (gm) 33.50 Final Void Ratlo:(e ) r 0.881 Final Moisture Content (M ) (%) f 32.85 |Flnal Saturation: s/ Tested by: Date: Checked by: AbrafaamAO? 21/03/98 Approved by:.40036 TEL 420616, 420601 FAX (251-1) 420153,400621 MATERIALS TESTING DEPARTMENT W.O N° '01950 . Date:- 29/02/98 Project :Baro hydro power project Client : ARDCO PLC Location: Baro 1 ( Dam site) Test Type: Triaxial ( CU) Object : Soil sample SPECIMEN DATA TP /BH N° B1-NTP-Q2 Sample N° Depth (m) 2.40 sample condition LBS Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm ) 1 11.34 Initial volume (cm ) 3 86.15 Initial Weight (gm) 177.66 Bulk density (g/cm ) 3 2.062 Final dry Weight (gm) 130.25 Dry density (g/cm ) 3 1.512 Mol8ture content (%) 36.40 P . R . Factor (KN/div) 0.0022 Remark P =1/2 (g^o,) , q = 1/2 (a,-a,) Chamber pressure, (KN/m2) (Oj) 100 200 300 C (KN/m ) f 0 (Degrees) Deviator Stress , (KN/m2) (G|- a}) 460 615 800 72 28 Pore pressure (KN/m2) 40 67 95 Tested by :-lsayas Demlle Date > 19/12/05 Checked by -.-Abraham Ase Date >19/1 Approw Dat<u&\ Aft * V IP.O. Box 40036 Tol 42 06 13-19 86 17-18 48 48 FAX (291-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVI8TIGAT1ON DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD ■ TIME SETTLEMENT READINGS Project : Baro hydropower project Client t ARDCOPLC Location: Bero 1 (Dam site) BH N* : Bt WTP O4(t«tt» DEPTH : Sample diameter (D) 75.00 mm Area (A) 44.18 cm |sample thickness (H> 2 20.00 mm Lever ratio “I 9 | ~ 1Kg on hanger gives pressure of: 20 Kga LOADING Increment N’ 1 2 3 4 6 6 7 T Date started 6/3/91 63/98 7/3/98 8/3/98 9/3/98 103/98 11/3/98 Load Kg 1 2 4 • 16 32 M • Pressure Kps 20 40 80 160 320 640 1240 • Elapsed time h m 8 t (mJn) Cumulative compression mm AH Cumuls Uve compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumutatlva compression mm AH Cumulaihre compression nun AH Cumulative compression am AH Cumulative compression mm AH 0 0 0.00 0.000 0.214 0x174 0.866 1.600 2.592 3.634 4.613 15 0.25 0.60 0.177 0.422 0.810 1.500 2.430 3.399 4.334 0.000 30 0.5 0.71 0.180 0.426 0.815 1.510 2.446 3.420 4.355 0.000 1 1 1.00 0.183 0.431 0.820 1.524 2.465 3.440 4.390 0.000 2 2 1.41 0.187 0.436 0.826 1.538 2/190 3.474 4.425 0.000 4 4 2.00 0.191 0.441 0.831 1.550 2.614 3.512 4.460 0.000 8 8 2.83 0.195 0.446 0.837 1.560 X530 3.540 4.498 0.000 15 15 3.87 0.199 0.450 0.842 1.568 2.544 3.580 4.635 0.000 30 30 6.48 0.204 0.454 0.848 1.575 2.556 3.575 4.566 0.000 1 60 7.75 0.208 0.458 0.854 1.580 2.568 3.690 4.585 0.000 2 120 10.95 0.210 0.462 0.858 1.585 2.572 3.602 4.595 0.000 4 240 15.49 0.211 0.466 0.861 1.590 2.577 3.614 4.603 0.000 p 480 21.91 0.212 0.470 0.863 1.595 2.580 3.624 4.610 0.000 24 1440 37.95 0.214 0.474 0.866 1.600 2.592 3.634 4.613 4.625 48 2860 53.67 72 4320 65.73 Hoteljmulatlve compros lion (At I - 0.214 0.474 0.866 1.600 2.592 3.634 4.613 4.625 Tested by: Date: Abraham Asset W03/98j^ Checked by: Date:•* P.O. Box 40034 TeL 42 OB 13-18 68 17-14 44 <6 FAX (251-1) 42 01 63 MATERIALS TESTING ANO FOUNDATION INVESTIGATION DEPARTMENT ONE ■ DIMENSIONAL CONSOLIDATION TEST CALCULATION SHEET Project : Client : Location: Bare hydropower project ARDCO PLC Bare 1 (Dam atte) BHN° : DEPTH : 01 NTP4M1UBSS1 Sample diameter (D) 75.00 mm 20.000 mm HeJ-f.tof solids Hs . 8.612 mm Height Ho Initial Voids ratio o« ■ 1.322 Voids Ratio COMPRESSIBILITY COEFFICIENT OF CONSOLIDATION lACT«naatal c. tncrannantN* P/MfUTQ P KR Cumutaflve compare eaten (AH) am ConaoiMatotf hatgni H-fU-aH VoMi Ratto a-H-HS/Ha Haight change rrjn PraaaMa change Kpa m'/MN t* mln W rain H • 1Z2JH,- Hj} pjMrHVw m'^aat (OdirMVu m'/yaat 0 0 0.000 20.000 022 0.214 20 0.535 1 20 0.214 19.786 1.287 - 36.00 19.893 1.22 0.474 40 0.599 2 40 0.474 19.526 1.267 - 7.84 19.656 5.47 0.392 40 0.502 3 80 0.866 19.134 1.222 8.00 19.330 6.18 0.734 80 0480 4 160 1.600 18.400 1.137 - 4.00 18.767 9.77 * 0.992 160 0.337 5 320 2.592 17.408 1.021 • 4.62 17.904 7.70 1.042 320 0.187 6 640 3.634 16.366 0.900 - 6.70 16.887 4.72 0.979 640 0.093 7 1280 4.613 16.387 0.787 - 30.25 15.877 0.92 8 320 4.274 15.726 0.826 -■ 80 4.000 16.000 0.868 10 20 3.800 16.200 0.881 • — Tested by: Date: Checked by: Abrpppfn Aasfl Approved by : Date: £J \ vF"t—: -r-r■WWW * r~ r;P.O. Box 40036 Tel 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : NTP-D4(UBSS) DEPTH : 4.00-4.25 Tested by Abraham Aes c checked by: Date: / i » Date : Checked by * i Approved by: Date: Date: • •P.O. Box 40036 T«L 42 06 13-U 66 17-16 4B 46 FAX (261-1) 42 01 63 MATERIALS TESTING ANO FOUNDATION INVESTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD ■ TIME SETTLEMENT READINGS Project : Client : Location: Baro hydropower project ARDCO PLC Baro 1 (Dam site) BHN° : DEPTH : Sample diameter (D) 76.00 mm Area (A) 44.18 cm (sample thickness (H) 20.00 mm a |Lever ratio I9I1 1Kp on hanger gives pressure of: 20 Kpa UNLOADING Tested by: Date: Checked by: Dale: Abraham Ab? 21/D3/M Approved by :Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP-D4(UB3S) DEPTH : 4.00-4.25 0.840 E E 0.860 0.880 0.800 0.820 Square, root.(Ime (mln) ---------------- Tested by Abraham Asse Date: Checked by: Date: ’^‘.checked by: Dat^ •Sate s» t? I « » • 4 A8 materials testing and foundation | nSX department Project: Client : Baro hydropower project ARDCO PLC Location: Baro 1 (Dam site) BH N° ; B1 NTP-D4(UBSS) DEPTH : 4.00-4.25 Tested by Abraham Assets Date: 21/03/98 Checked by: Date: ■t. »*.I I P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° : B1 NTP-D4(UBSS) DEPTH : 4.00-4.25 SQUARE ROOT TIME VS SETTLEMENT 2.470 2.550 E E 2.570 c o E 2.590 2.610 2.710 2.700 Squaj&Toot time (mln) Tested by Abraham Assets Date: 21/03/98 ^7^ Checked by: Date:testing i* ’reject: client : -ocatlon : Bare hydropower project ARDCO PLC Baro 1 (Dam site) BH N° : B1 NTP-D4(UBS3) DEPTH : 4.00.4.25 SQUARE ROOT TIME VS SETTLEMENT 1.480 1.500 iiiiijiiHiiiiSg Pressure = 160 Kpa tw = 4‘OQ min HHHHH 2 24 28 Tested by Date: Checked by: Date: Abraham Ass 21/03/98 s 9JWSMS!?t drne (mln) checked by: „ j^te : _____ ^Approved by:Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP-D4(UBSS) DEPTH : 4.00-4.25 Tested by Abraham As sera Date: 21/03/98 ^:^^ Checked by: Date: ~~~ > c checked by: Date :_ ? Approved by \ Date: :zjl ---------- J ■ as? MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° : B1 NTP-D4(UBSS) DEPTH : 4.00-4.26P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INSTIGATION DEPARTMENT Project : Baro hydropower project Client : ARDCOPLC Location: Baro 1 (Dam site) BH N° : B1 ntp-D4(Ubss> DEPTH : 4.00-4.25 COEFFICIENT QF CONSOLIDATION Vs LOG PRESSURE Tested by Date: Abraham Assfefa 21/03/98 5 Approved by Date: . Checked by: Date: V *r I.'P.O. Box 40036 Tel. 42 0613-16 6617-16 48 46 FAX (261-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N°: B1 ntp-04(ubss) DEPTH : 400-425 VOID RATIO VS LOG PRESSURE Q 1.000 > 0.850 PRESSURE (KN/nr) Tested by Date: Abraham Assffa 21/03/98 Approved by : Checked by. Date: JI I P.O. Box 40036 Tel. 42 06 13-16 66 17-16 46 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Client : Baro hydropower project ARDCO PLC Location: Baro 1 (Dam site) BH N° : ntp-D4(ubssj B1 DEPTH VOID RATIO VS LOG PRESSURE 6! = 1.137 P^KN/tnZ) 160 e 2= 1.021 320 e e = 0.786 3 » 0.900 4 Pl{KN*n2) 640 ?4(KN/m2) 0.000720 1280 (•r^MPrP*) Myf= a„/(1+Oj) Avg.Mvs (Mv^MvJ/2 0.000337 m’/KN 0.0001798 0.0000948 m’/KN 0.0002168 mVKN IP.O. Box 40036 Tel. 42 05 13-16 66 17-46 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : Location: ARDCO PLC Baro 1 (Dam site) BH N° : ntp-w(ubss) B1 DEPTH : 4.00-4.26 Date:.■ P.O. Box 40038 Tot. 42 0613*16 66 17*16 48 46 FAX (261*1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTJGATION DEPARTMENT ONE - DIMENSIONAL CONSOLIDATION TEST CALCULATION SHEET Project : Client : Location: Bare hydropower project ARDCO PLC Boro 1 (Dam site) BHN° : DEPTH : Sample diameter (D) 76.00 mm Height Ho Initial Voids ratio e ° ft Voids Ratio COMPRE SSIB1UTY COEFFl CIENT OF CO NSOUDAT1ON inaeiMntN* >rM«um P KP* I Cwnulrtlv* compitBilon ttH) mm ConvoUdaM b«l®ht VoM* R*Oo •-K416M* H«!pM cnanQs 1H mm Fthmi KP* m.HWAMTiOOO'M ■tot M-wpvtW pLoarwha. m*/ywr 0 0 0.000 20.000 0.9B6 • - • 0236 20 0.591 1 20 0.236 19.764 0.951 2736 19382 - 1.59 0.386 40 0.468 2 40 0.386 19.614 0.948 9.00 19.689 • 4.78 0.813 40 1.036 3 80 1.199 18.801 0.866 27.04 19.208 - 1.51 0.991 BO 0.859 4 160 2.190 17.810 0.767 6.25 18.306 • 6.95 1.091 160 0.383 6 320 3.281 16.718 0.659 7.56 17265 - 4.38 1.119 320 0209 6 640 4.400 15.600 0.548 6.25 16.160 - 4.64 1.048 640 0.105 7 1280 6.448 14.652 0.444 12.96 15376 - 1.95 8 320 4.154 15.846 0.573 9 80 3.071 16.929 0.680 10 20 2.164 17.B36 0.770 - I /] J •I -■ Tested by: Date: Checked by: Abraham Asa Approved by; Date: /Ol' --- * K.U. Box 40036 Tel. 42 0616,42 06 01 FAX (261-1) 42 01 631-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Pro). Date: N°: 01960 29/02/98 ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) Specimen data BECORETEST BH N° *. 01 NTP-O5{UM81 DEPTH: 2J5.2.M i i i Weight of sample & Ring (gm) 276.80 Specific Gravity (G ) a 2.66 Weight of Ring (gm) 112.25 Sample Diameter (D) (mm) 76.00 Weight of sample (gm) 164.55 Sample Thickness (H ) (mm) o 20.00 Weight of Dry Sample (gm) 113.98 2 Area (A) (cm ) 44.18 Weight of Initial Moisture (gm) 50.57 3 Volume (V) (cm ) 88.37 Initial Moisture content (M ) (•/•) o 44.37 3 Bulk Density (pb) (gm/cm ) 1.862 3 Dry Density (p^ (gm/cm ) 1.290 i [initial Void Ratio ; eQ c (GJpaH | | Height of Solids : H ° {initial Saturation : S = (M *G.)/e AFTER TEST t o 0 0 (%) | (mm)| 0.98S| 10.0771 115.34] i Weight of Sample + Ring +Can (gm) 327.00 Over all settlement (mm) 3.071 Weight of Dry Sample +■ Ring *Can (gm) 296.50 3 Volume change (cm ) 13.57 Weight of Ring ♦ Can (gm) 182.52 3 Final Volume (cm ) 74.80 Weight of Wet Sample (gm) 144.48 3 Final Bulk Density (gm/cm ) 1.932 Weight of Dry Sample (gm) 113.98 3 Final Dry Densslty (gm/cm ) 1.624 Weight of Final Moisture (gm) 30.50 Final Void Ratlo:(e ) r 0.680 Final Moisture Content (M ) (%) f 26.76P.O. Box 40038 Tel. 42 0813-18 6617-16 46 46 FAX (251-1) 42 01 63 MATERIAL8 TE8TING AND FOUNDATION INVIST1GAT1ON DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD ■ TIME SETTLEMENT READINGS Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam alto) BH N* : ■' HTPwnMTC) DEPTH : Sample diameter (D) 75.00 mm Area (A) 44.18 cm’ | Sample thickness (H) 20.00 mm Lever ratio T 9 1 i 1Kfl on hanger gives pressure of: 20 Kpa UNLOADING DIcramant N* 1 2 3 4 6 8 7 8 Dato startod 17/03/88 18/0 3/58 1W03/M Lea- Kq 16 4 1 Pros a uro Kps 320 80 20 Elnpaed tima h m at (mln) ■^t Cumulathro .omproailon mm AH Cumulative :ompro»sion mm AH Cumulative ;ompreulon rm AH Cumulative compression mm AH Cumulative :ompro»sion mm AH Cumulative compression mm AH Cumulative compraasion mm AH Cumuistivs compression mm All 6 0 0 5.448 4.154 3.071 6 0.1 0.32 10 0.17 0.41 15 0.25 0.5 30 0.5 0.71 1 1 1 2 2 1.41 4 4 2 8 8 2.83 16 15 3.9 30 30 5.5 1 60 7.75 2 120 11 4 240 15.5 .8 480 21.9 24 1440 3fi 4.154 3.071 1164 4f J 288C 53/ r 7 2 432 65. r Net cumulative compresslon/AH) 4.15 4 3.Q7 1 4 I/ ______ *. Tested by: Abraham Assjfa Date: 2V£3/98 Chocked by: Date: Approved by:P.O. Box 40011 Tel. 42 OS 13-16 M 17.18 48 41 FAX (261.1) 42 01 63 MATERIALS TESTING ANO FOUNDATION INVESTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TE8T LOAD •TIME SETTLEMENT READINGS Project : Client : Location: Bare hydropower project ARDCO PLC Bare 1 (Dam site) 0H N° : m ntpwims) DEPTH : Sample diameter (D) Lever ratio n 9 I r- 76.00 mm 1 Area (A) 44.18 cm (sample thickness (H) 20.00 mm 1Kg on hanger gives pressure of: 20 Kpa LOADING Incrrmom N* 1 2 3 4 6 6 7[7 □■to started 5/3/98 6/3/98 7/3/98 8/3/98 1/3/98 10/3/98 11/3/98 Load Ko 1 2 4 8 18 32 • 64 Preaaura Kpa 2D 40 80 160 320 640 1280 - t ■lapaod Unw h m e |t (mln) ^Jt Cumulative om pres a Ion mm AH Cumulative compraaalon c mm AH Cumuli Uva omproulon c mm AH JumulaUve I C □mprosilon cc mm AH umulatlve C >mpraai!on c mm AH .umulattva C umulatlve wnpresalon c<>mpra salon c mm mm AH AH lumulatlvo ompraaalon mm AH 00 0.00 0.000 0336 0386 1.199 2.190 3.281 4.400 5.448 15 0.26 0.50 0.198 0.314 1.098 2.055 3.116 4.140 5.061 0.000 30 0.5 0.71 0.200 0.324 1.110 2.070 3.130 4.170 5.090 0.000 1 1 1.00 0205 0330 1.124 2.084 3.150 4.198 6.130 0.000 2 2 1.41 0.210 0.335 1.138 2.102 3.174 4240 6.180 0.000 4 4 2.00 0216 0341 1.160 2.120 3.195 4280 6240 0.000 8 8 2.83 0319 0347 1.160 2.133 3214 4310 5312 0.000 15 15 3.87 0324 0352 1.168 2.143 3.228 4.329 5354 0.000 30 30 5.48 0328 0.358 1.176 2.162 3.242 4350 5.382 0.000 1 60 7.75 0332 0364 1.183 2.160 3.256 4.366 5400 0.000 2 120 10.95 0334 0370 1.190 2.168 3.252 4376 6.416 0.000 4 240 15.49 0335 0375 1.194 2.174 3.266 4386 6.430 0.000 8 480 21.91 0335 0380 1.198 2.180 3.272 4395 5.43 0.000 24 1440 3736 0.236 0386 1.19$ 2.190 3281 4.40( 6.44 8 5.448 48 2880 53.61 72 432C 65.71 Net cumulatfva compression (All) ■J^L Tested by: Abraham Ap^rovwl by: Date: 21/03/98 Checked by:4 C»i —— BQMTTtUCmON DtlOJ P.O. box 40036 Tel. 4206 13-16 66 17-16 46 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Client : Baro hydropower project Location : ARDCO PLC Baro 1 (Dam site) BHN° ! B1 NTP-D5(UBSS) DEPTH : 2.55-2^0 Tested by Abraham Ass *V < ^•c|iockod by: Data: 21/03/98 -•.. - . • •/ ■ dat6 : *, Checked by: Approved by Date: Date: * bl »• *.o. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 IATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Baro hydropower project ARDCO PLC Baro 1 (Dam site) BHN° : B1 NTP-DS(UBSS) DEPTH : 2.55-2.80 SQUARE ROOT TIME VS SETTLEMENT Pressure = 20 Kpa 0.210 -g* 0.220 E c o E o 2 o co 0.230 0.240 0.250 0.260 Tested by Abraham Asee Date: 21/03/98 Checked by Date: e^qjjn) --------------- • X- X c’cjidpked by: Dat0 ± Apprdyed by: Date:P.O, Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : Bl NTP-D5(UBSS) DEPTH : 2-55*2.80 SQUARE ROOT TIME VS SETTLEMENT 0 2 4 6 8 10 12 14 18 18 20 22 24 26 28 30 32 34 36 38 40 Square root time (mln) — Tested by checked by: Date: • ,*r : <^te:__________ Checked by: ‘‘AApppprro’v“ed by:. Date: baft: rI Ktbr^t;s™gand ou dat.on FAX (251-1) 42 01 63 Sn department FN Project: Client : Location: Bare hydropower project ARDCO PLC Baro 1 (Dam site) B HN° : Bl NTP-D5(UBSS) DEPTH : 2.55-2.80 SQUARE ROOTTWeVSSgTLaaBgP.O. Box 40036 Tef. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Client : Location : Baro hydropower project ARDCO PLC Baro 1 (Dam site) BH N° : Bl NTP-OS(UBSS) DEPTH : 2.85 - 2.80 SQUARE ROOT TIME VS SETTLENIENT 4 .OSO 4.100 4.150 4.200 4.250 4.: E *■ 4.- 4. 4 Square root time (min) Testod by Abraham ' Date-. Checked by: Date*. 21/03/98 cchecked by: Date ; Approved by : iuiUa iUmP.O. Box 40036 Tel. 42 06 13-16 6G 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Client : Location : Baro hydropower project ARDCO PLC Baro 1 (Dam site) BH N° ’. Bl NTP-t>5(UBS3^ DEPTH 2-55 - 2.B0 3 1OO 3.150 3.200 3.250 3.300 3.350 3.400 3.450 Tested by Date: Checked by: Date: Abraham Asse 21/03/98 c dhebked by: Daft __________ Approved by : Datp;< : L_ A* r .P.O. Box 40036 Tel. 42 06 13-16 66 17*16 48 46 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp-05(ubss) DEPTH : 2-55 -2.80 VOID RATIO VS LOG PRESSURE Tested by Date: Checked by: Date: Abraham Asse 21/03/98MBR.ALS TESTING AND FOUNDATION I—™ ” » •NVISTIGATION department roject: Bent : □cation: r ARDC hOydpr°lPc°we project Baro 1 (Dam site) BH N° : B1 NTP-OS(UBSS) DEPTH : 2.55-2.80 SgUARE ROOT TIME VS SFTTI centS .O. Box 40036 Tel. 42 0613-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCOPLC Location: Baro 1 (Dam site) BH N°: B1 ntp-ds(ubss) DEPTH :2.«-2.w VOID RATIO VS LOG PRESSURE ©1 = 0.548 e 2 55 0.444 P1 = 640 P2= 1280 Cc= (ei-ejyiogOVPt) 0.345 2 PRESSURE (KN/m ) Tested by Date: Checked by: Date: Abraham Assi 1 21/03/98 Approved by Date:11ATrnlll_ - FAX (251-1)42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGAT1ON DEPARTMENT Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp«d6(ubss) DEPTH I2.55-2.B0P.O, Box 40036 Tol. 42 0616,42 06 01 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Prof. N® : 01950 Date: 29/02/98 ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : D1 NTP-QlfLBS) DEPTH: 1-m SpuJmen data BEFORE TEST Weight of sample & Ring (gm) 287.06 Specific Gravity (G ) s 2.64 Weight of Ring (gm) 111.48 Sample Diameter (D) (mm) 75.00 Weight of sample (gm) 176.58 Sample Thickness (HJ (mm) 20.00 Weight of Dry Sample (gm) 142.48 2 Area (A) (cm ) 44.18 Weight of Initial Moisture (gm) 33.10 2 Volume (V) (cm ) 88.37 Initial Moisture content (M ) (%) o 23.23 3 Bulk Density (p*) (gm/cm ) 1.987 3 Dry Density (pd) (gm/cm ) 1.612 [initial Void Ratio : e ® (G /p )-1 0 ad 0.637| |Helghtof Solids: H, = H /(1+e ) (mm)| 00 12.216) |Initial Saturation : S = (M/GJ/e, (%j~| o 96.221 AFTER TEST Weight of Sample + Ring +Can (gm) 353.00 Over all settlement (mm) 1.480 Weight of Dry Sample ♦ Ring *Can (gm) 325.00 3 Volume change (cm ) 6.54 Weight of Ring + Can (gm) 182.52 3 Final Volume (cm ) 81.83 Weight of Wet Sample (gm) 170.48 3 Final Bulk Density (gm/cm ) 2.083 Weight of Dry Sample (gm) 142.48 3 Final Dry Densslty (gm/cm ) 1.741 Weight of Final Moisture (gm) 28.00 Final Void Rationed 0.516 Final Moisture Content (M ) (%) f 19.65 [Final Saturation : Sf c (M *G,)/erif : (%) | f t 100.51 Tested by: Date: Checked by: Date: Abraham Assofy Approved by: Date:MATERIALS TESTING AND FOUNDATION 48 46 FAX (251-1)42 01 53 INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp.d5(ubss) DEPTH :2.55-2.w Pl(KN/m2) 160 P 2(KN/m2) 320 P 3(KN/m2) 640 P 4(KN/m2) 12B0 0.000677 0.000383 m’/KN 0.0001625 0.0001050 m’/KN 0.0002439 m*/KNI ■P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (261-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGA'nON DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD - TIME SETTLEMENT READINGS Project : Baro hydropower project f'Client : ARDCO PLC Location: Baro 1 (Dam site) BH N* : bi mr-cnfLMj DEPTH : i-m Sample diameter (D) 76.00 mm Area (A) 44.18 cm1 |Sample thickness (H) 20.00 mm Lever ratio 101 1 1Kg on hanger gives pressure of: 20 Kpa LOADING Incromont Np 1 2 3 4 5 • 7 Date s tart ad 6/3/98 7/3/9! 8/3/98 9/3/98 10/3/98 11/3/98 • Load Kq 2 4 8 16 32 84 Pressure Kpa • 40 60 180 320 840 1280 • Elapsod time h m s (mln) •Vt Cumulative compreaalon mm AH Cumulative compreaalon mm AH Cumulative compression mm AH Cumulative compreaalon mm AH Cumulative compreaalon mm AH Cumulative compreaalon mm AH Cumulative compression mm AH Cumulative compreaalon mm AH 0 0 0.00 0.000 0.000 0.136 0236 0.422 0.700 1.126 1.765 15 026 0.50 0.000 0.121 0.198 0.372 0.620 1.025 1.640 0.000 30 0.5 0.71 0.000 0.122 0202 0.375 0.626 1.032 1.650 0.000 1 1 1.00 0.000 0.123 0204 0278 □.634 1.042 1.665 0.000 2 2 1.41 0.000 0.124 0207 0282 0.642 1.054 1.678 0.000 4 4 2.00 o.oob 0.126 0210 0.387 0.648 1.065 1.694 0.000 8 8 2.83 o.ooo 0.126 0213 0.392 0.654 1.076 1.708 0.000 15 15 3.87 0.000 0.127 0.215 0295 0.659 1.084 1.720 0.000 30 30 5.48 0.000 0.129 021B 0.400 0.664 1.094 1.731 0.000 1 60 7.75 0.000 0.131 0.221 0.404 0.669 1.100 1.738 0.000 2 120 10.95 0.000 0.132 0224 0.408 0.674 1.104 1.745 0.000 4 240 15.49 0.000 0.134 0227 6.413 0.680 1.108 1.749 0.000 8 480 21.91 0.000 0.135 0230 0.417 0.686 1.115 1.756 0.000 24 1440 37.95 0.000 0.136 0236 0.422 0.700 1.126 1.765 1.777 48 2880 63.67 72 4320 65.73 Nat cumulative compression (All ) f ) 0.000 0.136 0236 0.422 0.700 1.126 1.765 fl 1.777 Tested by: AbrahariLAssef Date: Checked by: Approved byP.O. Box <0036 Tel. 42 06 13-56 66 17-16 48 <6 FAX (261-1) 42 01 63 MATERIALS TEST1NO AND FOUNDATION INVIST13ATI0N DEPARTMENT OHE_-_DlMENSIONAL CONSOLIDATION TEST CALCVMTIQN sheet Project : Client : Location; Bare hydropower project ARDCO PLC Bare 1 (Dam alto) BH ND DEPTH Bl NTFM31(LBn Sample diameter (D) 75.00 mm Height Ho 20.000 mm Height of solids H* . 12.215 mm nlUal Voids ratio e = 0.637 o Voids Ratio COMPRESSIBILITY COEFFICIENT OF CONSOLIDATION incraffwnial Gv P*Mim w Cu»Ut«tN« ooiKpm<»toc (AM) mra ContoUdMMJ haighl nw> Void* RkUc chAno* 4H Pm*ur» CfeAAQ* •P Kpa ■.•(BWflOOWM n*nm U mU w mln H * 1/QHt* H>} ((MJWH’y*. m’/yw PlIWHV" 0 0 0.000 20.000 0.637 0.138 40 0.170 1 40 0.136 19.864 0.626 • 95.06 19.932 - 0.46 0.100 40 0.126 2 80 0.236 19.764 0.618 - 14.06 19.814 - 3.10 0.186 80 0.118 3 160 0.422 19.578 0.803 10.56 19.671 -• 4.07 0.278 160 0.089 4 320 0.700 19.300 0.680 - 14.44 19.439 2.90 0.426 320 0.069 5 640 1.126 18.874 0.545 - 4.84 19.087 8.36 0.638 640 0.053 6 1280 1.765 18.236 0.493 - 7.56 18.556 6.05 7 320 1.602 18.398 0.506 8 80 1.480 18.520 0.516 - - - • I Tested by: Date: Chocked by: Abrpha.niASSJ 21/03/98 Approved by: Date:P.d. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCOPLC Location : Baro 1 (Dam site) BH N° : 81 NTP-Qt(LBS) DEPTH : 1.55 Tested by Abraham Asbg Date: 21/03/98 Checked by: Date: c checked by: Date : Approved by : Date: ; / •/P.O. Box 40038 Tel. 42 08 13-16 66 17-16 48 48 FAX (251-1)42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD > TIME SETTLEMENT READINGS Project : Client : Location: Baro hydropower project ARDCO PLC Baro 1 (Dam eite) DEPTH : Sample diameter (D) 75.00 mm Area (A) 44.18 cm’ |Semple thickness (H) 20.00 mm Lever ratio I9I1 1Kg on hanger gives pressure of: 20 Kpa | UNLOADING DtCHHYMjnt N* 4 Date atartod Load Prwsura 5 6 7 Kq Kpa — n —-— Elapeed time 1 17IO3/9B .16 320 Cumulative comprwion mm AH 1.777 2 18/03/08 4 80 Cumulative compression mm AH 1.602 3 1W03/M 1 20 Cumulative compraaalon mm AH 1.480 Cumulative i/t l omproaalon mm AH Cumulative :ompr»aalon mm AH Cumulative lomprosslon mm AH Cumulative Cumulative h tn a t (mln) .ompreaalon c mm AB ompre talon mm AH 0 6 10 16 30 • 1 2 4 8 15 30 1 2 4 8 24 0 0.1 0.17 0.25 0.5 1 2 4 8 15 30 60 120 240 480 1440 2880 4320 0 0.32 0.41 0.5 0.71 1 1.41 2 2.83 3.9 5.6 7.75 11 15.5 21.9 38 53.7 65.7 1.602 1.480 48 ■ 72 Note umuloth re comi jression(Ml) .WALUEI 71 # • Tested by: Abraham Aase Date: 21/03/88 Checked by: / S'" * vSJKk. Approved by:_'rA Z Date: •, . HZxtJ diMATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCOPLC • Location : Baro 1 (Dam site) BH N° : NTP-QI(LBS) DEPTH : 165 SQUARE ROOT TIME VS SETTLEMENT (mln) c checked Date : Approved Date: :a .O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX 1261.11 d? M m MATERIALS TESTING AND FOUNDATION INSTIGATION DEPARTMENT Project: Client : Location : Baro hydropower project ARDCOPLC Baro 1 (Dam site) BHN° : B1 NTP-QI(LBS) DEPTH I 1.55’.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° : B1 NTP-Q1(LBS) DEPTH : 1.55 1.000 1.010 1.020 1.030 1.040 1.070 1.080 1.130 1.190’- 1.200 £ 0 46 Tested by Abraham Assets Date: 21/03/93 ffiZ Checked by: ^=2/ Date: checked by: : pproved by: pte: :z S K—-——J P.O. Box donns T« r? MATBR.ALS TESTING AND FOUNDATION Project: Client : Location: Baro hydropower project ARDCO PLC BHN° : B1 NTP.Q-I(LBS) DEPTH : 1.56 SQUARE ROOT TIME VS SETTLEMFMt E E c o ! CO Tested by Abraham As Date: 21/03/98 Checked by: Date: c checked by: Date : Approved by Dale:P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp-qi(lbs) DEPTH ;i-« VOID RATIO VS LOG PRESSURE Tested by Date: Checked by: Date: Abraham Asseffa 21/03/98 Approved by :FAX (251-1)42 01 53 an fo D UN daw N1 n VST1 gaK1!eSe t N Project : Client : Location: Baro hydropower protect AROCO PLC Baro 1 (Dam site) BH N°: bi ntp-qi(lbs) DEPTH IK §9y^^gmMEYSSEnLEMENT MRI Pressure = 1280 Kpa | 1740 ~ 1750 II X % BP 1 ° 2 4 6 8'A « U «« 20 22 24 26 28 30 32 34 38 38 ■_■ < Tested by Abraham Assdfa Date: 21/03/9$ Checked by: Date: PI/ ’ -•M •« QJ/ <■ root time (mln) .cj • ’ t* \ -------------------------------- c checked by: ->Date: Approved by: fcDate: :____ ' V v V vCBS- 4 P.O, Box 40036 Tel. 42 06 13-16 66 17-16 4fl 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp-qklbsj DEPTH :i.« VOID RATIO VS LOG PRESSURE e, = 0.545 e2 = 0.493 P,= 640 P2 = 1280 CcB (e^yiogfP^t) 0.174 2 PRESSURE (KN/m ) Tested by Date: Checked by: Date:• 06 1346 66 1746 48 46 FAX (2514) 42 01 53 AND FOUNDATION INVtSTIGATION DEPARTMENT ydropower project OPLC 1 (Dam site) BH N° : B1 NTP-QI(LBS) DEPTH -4.55 COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE’.0. Box 40036 tel, 42 06 16,42 06 o4 FAX (261-1) 42 01 63 MATERIALS TE8TING AND FOUNDATION INSTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) Specimen data BEFORE TEST Pro). N*: 01960 Date: 29/02/98 BH N° : Bl NTP-Q2(LBS) DEPTH: Weight of sample & Ring (gm) 306.40 Specific Gravlty(G J 2.65 Weight of Ring (gm) 111.63 Sample Diameter (D) (mm) 75.00 Weight of sample (gm) 194.77 Sample Thickness (H ) (mm) e 20.00 Weight of Dry Sample (gm) 142.48 2 Area (A) (cm ) 44.18 Weight of Initial Moisture (gm) 52.29 3 Volume (V) (cm ) 8837 Initial Moisture content (M ) (%) o 36.70 3 Bulk Density (pu) (gm/cm ) 2.204 3 Dry Density (pd) (gm/cm ) 1.612 [Initial Void Ratio: e„ ° (G,/p.,)-1 | 0.644] | Height of Solids : H, = H.A'l+e.) (mm)| 12.169] |Initial Saturation : S = (M *G )/e (%) | e oto 151.12| AFTER TEST Weight of Sample + Ring +Can (gm) 356.00 Over all settlement (mm) 0.635 Weight of Dry Sample + Ring +Can (gm) 325.00 3 Volume change (cm ) 3.69 Weight of Ring + Can (gm) 182.52 3 Final Volume (cm ) 84.68 Weight of Wet Sample (gm) 173.48 3 Final Bulk Density (gm/cm ) 2.049 Weight of Dry Sample (gm) 142.48 3 Final Dry Densslty (gm/cm ) 1.683 Weight of Final Moisture (gm) 31.00 Final Void Ratio:(ef) 0.575 Final Moisture Content (M ) (%) f 21.76 [Final Saturation : S = (M *6 j/e f f f : (%) [ Tested by: Abraham Ass Jy Date: Checked by: Date:L« 6 T® ’ 42 W 'l3’‘IG66 1746 48 46 FAX (2614) 42 01 53 MATERIALS TESTING AND FOUNDATION INVIST1GAT1ON DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N°: 01 ntpomlqs) DEPTH Uss VOID RATIO VS LOG PRESSURE e! = 0.603 e 2 = 0.680 e 3 = 0.645 e 4 = 0.492 a = (•re.MPrPi) M = ^/(l**,) vi tl M = a^(1*e>) VJ Avg.Mv= (Mv-j+MViJ/2 P^NftnZ) 160 ^2(KN/m2) 320 Ps(KN/m2) ®40 P<HKNhn2) 1280 0.000142 0.000089 m’/KN 0.0000833 0.0000539 m*/KN 0.0000713 m’/KN Tested by Date: Checked by: Date:1 MATERIALS TESTING AND FOUNDATION INVIST1GATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD > TIME SETTLEMENT READINGS ■: Project : Bare hydropower project Client : ARDCOPLC Location: Baro 1 (Dam site) . BHN’ : DEPTH : ei WTP-cntLBD |Sample diameter (D) 75.00 mm Area (A) 44.18 cm’ |sample thickness (H) 20.00 mm I Lever ratio ...I.. ,g L 1 1Kg on hanger gives pressure of: 20 Kpa LOADING Increment N° 1 2 3 4 5 • 7 Dau started 6/3/S8 7/3/M 8/3/M e/j.'ea 10/3/98 11/3/M • Load Kg . 2 4 8 16 32 64 - Pressure Kpa 40 80 160 320 640 1280 • Elapsed time h m s t (mln) ^t Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulathre compression mm AH Cumulative compression mm AH Cumulative compression mm AH 0 0 0.00 0.000 0.000 0.036 0.139 0.318 0.618 0.786 1.106 16 0.25 0.50 0.000 0.016 0.104 0.248 0.460 0.724 1.028 0.000 30 0.5 0.71 0.000 0.020 0.106 0.255 0.466 0.730 1.038 0.000 1 1 1.00 0.000 0.021 0.108 0.261 0.474 0.735 1.046 0.000 2 2 1.41 0.000 0.022 0.111 0.267 0.479 0.742 1.053 0.000 4 4 2.00 0.000 0.023 0.114 0.274 0.484 0.748 1.061 0.000 8 8 2.83 0.000 0.024 0,117 0.279 0.488 0.753 1.068 0.000 15 15 3.87 0.00D 0.025 0.120 0.284 0.492 0.758 1.072 0.000 30 30 6.48 0.000 0.026 0.122 0.288 0.496 0.762 1.076 0.000 1 60 7.76 0.000 0.028 0.125 0.292 0300 0.766 1.080 0.000 .2 120 10.95 0.000 0.030 0.126 0.296 0.504 0.771 1.085 0.000 4 240 15.49 0.000 0.031 0.131 0.301 0.508 0.775 1.090 0.000 8 480 21.91 0.000 0.033 0.134 0.306 0312 0.77B 1.095 0.000 24 1440 37.95 0.000 0.036 0.139 031B 0318 0.785 1.106 1.106 48 2880 53.67 72 4320 65.73 Not ci imulallvo sompres lion (All) /I 0.000 0.036 0.13E 0.316 0.518 0.786 1.106 1.106 Tested by: Date: Checked by: Abraham Asse Approved by I a’•'k bi* Vwiii oi ii iy.<4 41A fax (Hid) <i0113 KWH tmtino ano foundation invistwation department W. calculation sheet Project : Client : Location: ‘Samote £mj Biro hydropower project ARDCO PLC Bare 1 (Dam alte) BHN° DEPTH **Pt 76J0Q mtn iHaAHnoisc^ ■*» Height Ho f== i9 1X169 mm Initial Voids ratio e • o 0.644 VttoRaSo c:ompre COEFF XS H *w «=»«V XI Pwmn * «*• ■SS1BILTTY ■,-omyriww «*lMN *•» ICIENT OF CO H« V2fH«« HJ NS OLID ATI □N c P.111M7U w’/ywtr M’/yw tL 1 TJKD : 2LSOf p £S44 - - ** cxsg; 40 01X45 1XM £^41 J! . 90.25 19.982 .5 j-OB] 48 0.49 0.129 2 <K- £□3 1XZ2 ‘ - 15-21 19.913 n I *tb; V 2.89 0.113 z> 15~T 7 - 7.84 19.772 5.53 □23 t-?u ”&£X2 ism 7---------- !I 0C84 7.56 19.582 5.63 «5 = •/ I . . 5-28T 2Z5 0,543 4.00 19.349 10.39 1 t-ac A S-3Z! i CO Q£2& -□st -x* - 7M 19.055 5.33 -------------------------------------------------------------------- -------- 228 55 ? I■ n "‘ /......-*■■• i.- -■ 1«$ j jj " 1.1 - 1 11 ii ! ■ 1 1 l | f '-------------------- - 1 l «r ■ ............... .-1 I Approved by:► ’.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP«Q2(LBS) DEPTH : 2.40 Tested by Abraham Asse Date: Checked by: Date: 21/03/9 *- cchecked by: Date : Approved by Date: : r.■ P.O. Box 40036 TeL 42 06 13-16 88 17-16 48 46 FAX (261-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT .ONE PJMENSIONAL CONSOLIDATION TEST LOAD - TIME SETTLEMENT READINGS Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : 81 NTF^uaes) DEPTH : Sample dlamotor (D) 76.00 mm Area (A) 1 44.18 cm 1 Sample thickness (H) Lever ratio J§L 20.00 mm 1 1Kg on hanger gives pressure of: 20 Kpa UNLOADING 01 creme nt N* 1 2 3 Date steeled 4 5 6 7 —T—fl 17/03/93 18/03/98 19/03/93 Load Kg 16 4 Kpa 1 Preesurs 320 00 20 Bapeedtlme h tn a (mln) * Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulative com pre eel on mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH Cumulative compression mm AH 0 0 0 1.106 0.962 0.835 6 0.1 0.32 10 0.17 0.41 15 0.25 0.5 30 0.5 0.71 1 1 1 2 2 1.41 4 4 2 B 8 2.83 15 16 3.9 30 30 5.5 1 60 7.75 2 120 11 4 240 15.5 8 480 21.9 24 1440 38 0.962 0.835 - 48 2880 53.7 72 4320 65.7 Net cumulatl ve compression (Aid) 0.962 0.835 AVALUEJ Tested by. Date: Abraham Asse 21/03/98 Approved by: Checked by: Date: 1*.0 Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP-Q2(ieS) DEPTH : 2.40 SQUARE ROOT TIME VS SETTLEMENT Tested by Date: Checked by: Date: z 1P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (261-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° : 81 NTP-Q2(LBS) DEPTH : 2.40’.0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP-Q2(LBS) DEPTH : ;uo SQUARE ROOT TIME VS SETTLEMENT .Square root time (mln) Tested by Abraham Assqfa Date: Checked by: 21/03/98 I Date: ~ ’ cchecked by: : Approved" by41 OQNBTf^VO'riON DKVI«N BO*. 3 .0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INV1ST1GATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam Bite) 01 BH N° : ntp-Q2(lbs) DEPTH : 2.40 SQUARE ROOT TIME VS SETTLEMENT Square root time (mln) Tested by Date: Checked by: Date: cchecked by: Date :________ Approved by: rn.i nJ.3 ,0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : ’ ntp-02(lbs) B DEPTH VOID RATIO VS LOG PRE SSURE I RESSURE ( KN/m‘) Tested by Abraham Assgta 1 Approved by : Date: Checked by: Date:D= PO Box 40036 Tel. 42 06 13-16 66 17-16 4846 FA^^51-1) 42 01 63 materials TESTING AND FOUNDATION INVISTIGATION DEPAR Project: Bare hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BH N° : B1 NTP-Q2(LBS) depth : 2 40 - SQUARE ROOT TIME VS SETTLEMENT g- 1.080 F 1.090 '^uareroottim&(mln) Tested by Abraham Assdfa Date: 21/03/9.8 3 Checked by: Date: ^checked by: Date; Approved by; Datd: ; TO' "*’; rMATERIALS TESTING AND FOUNDATION INVISTIGAT1ON DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp-q2(lbs) DEPTH '.2M e, = 0.579 e2 = 0.553 P, = 640 P2= 1280 Cc= (et-ej^yiogCP^f) 0.088 2 PRESSURE (KN/m ) Tested by Abraham Asse Date: Checked by: Date:(& ’.0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project : Bare hydropower project Client : ARDCOPLC Location: Baro 1 (Dam site) BH N° : B1 NTP-Q2(LBS) DEPTH 12.40 COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE PRESSURE (KN/m ) 2 Tested by Date: Checked by: Date; Abraham Assgfa 21/03/98 ^Approved by:' P.O. Box 40036 Tel. 42 06 16,42 06 01 FAX (251*1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Pro). N*: 01960 Date: 29/02/98 ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) Specimen data BEFORE TEST BH N° : 01 MTP-Q4(LB8) DEPTH: 2-w Weight of sample & Ring (gm) 208.65 Specific Gravity (GJ 2.6B Weight of Ring (gm) 132.01 Sample Diameter (D) (mm) 50.00 Weight of sample (gm) 76.64 Sample Thickness (H ) (mm) o 20.00 Weight of Dry Sample (gm) 66.48 1 Area (A) (cm ) 19.64 Weight of Initial Moisture (gm) 20.16 3 Volume (V) (cm ) 39.28 Initial Moisture content (M ) (%) o 35.69 3 Bulk Density (pb) (gm/cm ) 1.951 3 Dry Density (pj (gm/cm ) 1.438 [initial Void Ratio : e = (G^pJ-l 0 [Height of Solids : H,B Ml+eJ (mm) | [initial Saturation : S «= (M/G,)/e o o (%) , 0.8641 10.732| 110.77) AFTER TEST Weight of Sample + Ring +Can (gm) 255.00 Over all settlement (mm) 1.327 Weight of Dry Sample + Ring +Can (gm) 239.00 3 Volume change (cm ) 2.61 Weight of Ring + Can (gm) 182.52 3 Final Volume (cm ) 36.67 Weight of Wot Sample (gm) 72.48 3 Final Bulk Density (gm/cm ) 1.977 Weight of Dry Sample (gm) 56.48 3 Final Dry Densslty (gm/cm ) 1.540 Weight of Final Moisture (gm) 16.00 Final Void Ratio:(ef) 0.740 Final Moisture Content (M ) (%) r 28.33 [Final Saturation: S «(jiy f Tested by: Abraham Asset Approved by^. Date: urn Checked by: Date: vMATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : NTP-Q2ILBS) DEPTH VOID RATIO VS LOG PRESSURE 6, = 0.617 e 2 = 0.601 e 3 = 0.579 O = 0.653 4 a^= M^= a^lfe,) (•j-oJAPrP,) M,z= atJ/(1+e ) 3 Avg.Mv= (Mvi+Mv )/2 2 Pf(KN/m2) 160 P2(KN/m2| 320 P3(KN/m2) 6*0 P4(KN/m2) 1280 0.000103 0.000064 m2/KN 0.0000412 0.0000261 m’/KN 0.0000448 m2/KN Tested by Date: Checked by: Date: Abraham Ass 21/03/98 • 'Approved by: Date:'' -5. j § f F ,-v. J# 9*. VP.O. Box 40038 TeL 42 06 13-18 U 17-18 48 48 FAX (261-1) 42 01 63 MATERIALS TESTING AND FOUNDATION WVISTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD ■ TIME SETTLEMENT READINGS Project : Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N* : * wpoiiim) DEPTH : trample diameter (D) 50.00 mm Area (A) 19.64 cm [Sample thickness (H) 20.00 mm 3 I Lever ratio | 10 ( 1 1Kp on hanger gives pressure of: 50 Kpa LOADING Increment N° . 1 2 3 4 8 • 7 Data started 6/3/9B 7/X'll i/3/ss 8/3/98 lorm 11/3/M - Load Kg 2 4 • 16 32 64 • Pressure Kpa 100 200 400 800 1600 3200 • Elapsed time h m 6 t (mln) 'h Cumulative compression mm AH Cumulative compression mm AH Cumulative compression HOT AH Cumulative compression mm AH Cumulative compress ton mm AH Cumuletlve compression mm AH Cumulative compression mm AH Cumulative compression mm AH 0 0 0.00 0.000 0.000 0403 0.4B8 0.640 0.838 1.116 1.818 15 0.25 0.50 0.000 0.391 0448 0.564 0.740 0.986 1.298 0.000 30 0.5 0.71 0.000 0.392 0449 0.570 0.750 0.997 1.320 0.000 1 1 1.00 0.000 0.393 0.451 0373 0.758 1.010 1348 0.000 2 2 1.41 0.000 0.394 0452 0.579 0.766 1.023 1378 0.000 4 4 2.00 0.000 0395 0454 0.583 0.775 1.035 1.416 0.000 8 8 2.83 0.000 0.395 0457 0387 0.782 1.046 1.457 0.000 16 15 3.87 0.000 0397 0460 0390 0.787 1.053 1490 0.000 30 30 5.48 0.000 0.398 0464 0395 0.794 1361 1316 0.000 1 60 7.75 0.000 0.399 0468 0.600 0.800 1.068 1338 0.000 2 120 10.95 0.000 0.400 0.472 0308 0306 1.077 1360 0.000 4 240 16.49 0.000 0.401 0476 0314 0.812 1.085 1380 0.000 8 480 21.91 0.000 0.402 0.480 0323 0.820 1.095 1.600 0.000 24 1440 37.95 0.000 0.4D3 0.488 0340 0.838 1.116 1318 1318 48 2880 53.67 72 4320 65.73 Net c jmulaUve compros ilon (AH 0.000 0.403 0488 0340 0338 1.116 1.618 1318 Tested by: Date: Checked by: Abraham Assef 21/03/9 Approved by Date:F.O. Box 40038 Tot 42 06 13-18 86 17.16 48 46 FAX (251*1) 42 01 W MATERIALS TESTING AND FOUNDATION INVIST1QAT1ON DEPARTMENT ONE - DIMENSIONAL CONSOLIDATION TEST CALCULATION SHEET Prujvcx : Client : Location: Bare hydropower project ARDCO PLC Baro 1 (Dam site) BHN° ; DEPTH : Bl NTP*a4(LBS) 2 Sample diameter (D) 50.00 mm Holght Ho 20.000 miT Height of solids H$ . 10.732 nm nitlal Voids ratio o ■ 0 0.864 /olds Ratio COMPRE SSIBILITY COEFF CIENT OF CONSOLIDATION Miitai a Kpa Cumutafhra Consolidated beighl Void* Rato Haight change (AKJ Pcwjuri ehanga •p Kpa Ok'/HN u min L. mln H-miHr K>j c» p.0WH*A. m’ryem (MlVH*yita m*/yaar 0 0 0.000 20.000 0.864 0.403 100 0.201 1 too 0X03 19.597 0.826 18.06 19.799 2.41 0.086 100 0.043 2 200 0.488 19.612 0.818 47.61 19.565 0.89 0.162 200 0.039 3 400 0.640 19.360 0.804 4.41 19.436 - 9.51 0.198 400 0.026 4 800 0.83B 19.162 0.786 6.76 19.261 - 6.09 0.278 BOO 0.018 5 1600 1.116 18.884 0.760 4.00 19.023 - 10.04 0.502 1600 0.017 6 3200 1.618 18.382 0.713 12.25 18.633 - 3.15 7 800 1.460 18.640 0.728 8 200 1.327 18.673 0.740 - - - Tested by: Date: Checked by: —? Abraham Asseff Zf .* ■ v Approved by: v* Date: t A -V. / 2 Lo 7-P Date: i V- c > • •• •> II *. * V■ 41 pOr<,TWUCTION O«»*ON •<*- 'TIIMfl P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° ; B1 NTP-Q4(LBS) DEPTH : 2.00 Date: Chocked by: Date: 21/03/9 c checked by: ved by:^4:-------- 1 P.O, Bom 40038 Tel. 42 06 13-16 M 17-16 48 48 FAX (251-1)4201 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD - TIME SETTLEMENT READINGS Project : Client : Location: Bare hydropower project ARDCO PLC Baro 1 (Dam aite) BHN° I B1WTMN(LB8) DEPTH : ioo Sample diameter (D) 50.00 mm Area (A) 19.64 cm’ (sample thickness (H) 20.00 mm Lever ratio 1 1° I ~i 1Kg on hanger gives pressure of: 50 Kpa UNLOADING Tested by: Date: Checked by: Abraham Awf Approved by: Date: — . -’.0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251 -1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCOPLC Location : Baro 1 (Dam site) BH N° : B1 NTP-Q4(LBS) DEPTH : 2.00 SQUARE ROOT TIME VS SETTLEMENT 0.550 0.570 0.580 E 0.590 g c 0.600 0.620 0.630 0.640 Square root time (min) Tested by Abraham Assfa Date; Checked by: ' * Date:’.0. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Client : Baro hydropower ARDCOPLC project Location : Baro 1 (Dam site) BH N° : B1 NTP*Q4(LBS) DEPTH : 2.00 SQUARE ROOT TIME VS SETTLEMENT ested by Abraham Asee' late; 21/03/98 =</ becked by.* ate:MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location : Baro 1 (Dam site) BHN° : B1 NTP-Q4ILBS) DEPTH : 2.00 1.050 1.070 E ~ 1.090 Square root time (mln) Tested by Abraham Ass jf a < -iX .a c checked by: Date: - £ Date : Checked by: • 4. •* ** k Approved by: Date: • ' * * • •• . Date: ; ‘. ••■‘IProject: Client : Location : Baro hydropower project ARDCO PLC Baro 1 (Dam site) BH N° ; B1 NTP-Q4(LBS) DEPTH : 2.00 Tested by Abraham Aastfa Date: 21/03/98 Checked by: Data: / v* » . \ c checked by: £ Date : •a o • Approved by : '.Date: vj >’.o'. Box 40036 Tel'. 42 06 13-16 66 17-16 40 46 FAX (251-1) 42 01 63 MATERIALS TESTING AND FOUNDATION INVIST1GATION DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° i 81 NTP-O41LBB) DEPTH VOID RATIO VS LOG PRESSURE PRESSURE (KN/m’) Tested by Date: Checked by: Date: Abraham Ass 21/03/98 Approved by:UTCRULS TOUnSSJ; DE^TMENT > rojoct: -Sent : -ocsbon: Bare hydropower project ARDCOPLC Bare 1 (Dam site) BHN* : B1 NTP-Q4(LBS) 2.00 SQUARE ROOT TIME VS SETTLEMENT Pressure = 1280 Kna ■ ■■■■ 1!! !■ ■■■"!! Square root time (mln) Tested by Date: Checked by: Date: Abraham Asse 21/03/98 c checked by: Date : Approved by: Date: ;P.O. Box 40036 Tel. 42 06 13-16 66 17-16 46 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTJGAT1ON DEPARTMENT Project: Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : NTP-O4(LBS) DEPTH :2-oo VOID RATIO VS LOG PRESSURE e, C 0.760 ej = 0.713 Pt« 1600 P2 = 3200 Cc= (G<-« yiog(P/P ) 1 1 0.155 Tested by Date: Checked by: Date: Abraham Assdfa 21/03/98 Zl Approved by.; Date: • .■»».O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project ; Baro hydropower project Client : ARDCO PLC Location: Baro 1 (Dam site) BH N° : B1 ntp-cm(lbs) DEPTH :2.oo COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE 20J Z o H < D □ O CO 2- O ra y >» 10.00 14.1 10000 PRESSURE (KN/m ) 2 Tested by Abraham Asstffa Date: 21/03/98 3 Checked by: Date: Approved by: Date: aVolume 4 C - Annex 4 E Page v Testing of Soil Samples Baro 2 Frontpage Annex 4 E.doc NORPLAN - NORCONSULT - LAHMEYER JV »n association with Shebelle Engineering and WWDSEProject: Bare hydropower project Client : ARDCO PLC Location: Bare 1 (Dam site) BH N° : B1 NTP«Q4(I.BS) DEPTH :2.oo VOID RATIO VS LOG PRESSURE 0730 01 = 0.804 e 2 = 0.786 e 3 = 0.760 e 4 c 0.713 0*1* (•rWrh) a^Ue,) (•r«4y(PrP4) M =a v2 vt /(1+e ) 3 Pl(KN/m2) 400 P 2(KN/m2) 800 P 3(KN/m2) 1600 P 4{KN/m2) 3200 0.000048 0.000026 m’/KN 0.0000292 0.0000166 m’/KN Avg.Mv=» (Mvt+MvtJ/2 0.0000211 m’/KN Tested by Abraham As Approved Date by: Date: 21/03/98 Checked by: Date:_______________________ Materials Testing & Foundation Investigation Department__________________ B 40036 » 420800, 423366, 420616, 420601 FAX (251-1) 420153, 400621 W.O.No. 01281 Project :■ BARO 2 DAM SITE Client ARDCO PLC Location BARO RIVER NOTIFICATION OF TEST RESULTS The Materials Testing and Foundation Investigation Department of Construction Design Share Company has carried out laboratory tests for Bara Dam Site of ARDCO Pic... This report is composed of laboratory test results report, necessary data sheets and graphs. Addis Ababa August. 2005W.O.No. 01281 LABORATORY REPORT Project BARO 2 DAN SITE Client :■ ARDCO PLC Location BARO RIVER Addis Ababa August, 20053. Direct shear UCS, and permeability test I Lem BH Depth N” N" . (nL Bulk unit weight Wl ) UCS (KN/m2) 1 Cohesion C (KN/tn ) 2 1 B2.NTP-Q3(U) 2 B2.NTP-Q4(U| . >•y B2 NTP-Q2(l)| _ 0.85-1.15 17.10 267 1.45-1 75 17 26 271 0.70 10 20 10 719 Angle of internal friction 0 (Degrees ) 47 19 30 29 Permeability K ( Cm / 1 4 B2.NTP-Q2(R) 0.70- 1.0 5 B2.NTP-Q3(R) 0.85-1.15 - 143 - 729 6 1 7 B2.NTP-Q4(R) B2.NTP-Dl(Uj 1.45-1.75 0.35-0.65 15.70 472 - - - — - — 4. Modified Compaction I ivc graphs (nr Modified Compart ion test result are drawn and attached herewith 5. Triaxial The necessary- Data and graphs for Triaxial lest result are attached herewith. 8 B2.NTP-D2(U) 0.30-0.60 20.16 - 3.24x 106 6.24x10-3 - 6. One dimensional consolidation and swell pressure test Time - settlement. void ratio- pressure curve and (he necessary data sheets for one - dimensional consolidation and swell pressure lest result arc attached herewith U Stands for Undisturbed «s R Stands for Rr-rntildcd Tested by Anlry & Emebcl Checked bv : Abrah.im Asscfa^^^XpprovccI'bvss - Dale 04/12/97 ’ Date 27/11/9? fVrre-’ • a (1 ~kW.O.N° = 01281 Date = 22/10/97 Project :• Baro 2 - Dam. site Client :■ ARDCO PLC Location :■ Baro river Test :• Various tests Object Soil samples submitted by the client ■1 • Atterberg timits, Linear TEST RESULTS ic matter content and e ic item iV BH X" V i Depth Liquid 1 Plastic ( m J limit limn U (%) (%) Plasticity Linear index 1 Shrinkage (%) (% J Organic matter content (%J Specific gravity . B2-NTP-Q2(RJ 0.70-1 90 50.00 25.32 24.68 14.00 5.90 2.49 20.53 Moisture Con re nt (%) B2 NTP-Q2(b) 0.70-1.00 47.00 23.45 23.55 - - -- B2-NTP-Q.3 0.85-1.15 45.45 30.94 14.51 13.33 i 9.15 2.50 1 19.21 B2-NTP-Q4 1.45-1.75 <54.65 34.92 19.93 13.33 5.00 2.49 1 1 29.03 B2-NTP-D1 0.35-0.65 32.80 22.85 9.95 B2-NTP D2 0.30-0.60 NP NP NP B2-NTP-Q5 0.50 1- 7.37 2.58 2 1.45 4.26 2.61 1 12.45 1.26 1 - - B2-NTP-Q6 82-XTP Q7 2. Grain size analysis 0.30 0 45 - - - 0.16 1.30 / ^5 1 r:: yrnphs for the yr.un size disti ibuiion tin- dr'iwn and altac bed herewith.WC/Pro/ No . Lf Da\e [Samole ID | &W& P.O. Box 40036 Tel. 420616-420601 FAX (251-1)42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Baro-2-Dam site Client : ARDCO PLC Location: Baro river Description: Red to brown sandy clay with some silt TP/BH B2-NTP-Q3 Depth (m) 0.85-1.IS GRAIN SIZE DISTRIBUTION [specific gravity ! 2 50 I Tested by: Date : Chocked by? Date? IsLqe &.Abraham • 8/11/97 Abraham AsscfabVVO/Proj NO Dale [Sample IE P.O. flox 40036 Tel. 420616-420601 FAX (251-1)42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Client : Location, Description: Baro-2-Dam site ARDCO PLC Baro river Dark greyish silty sand with clay TP/BH Depth (m) srNTr-c: GRAIN SIZE DISTRIBUTION |Specific gravity Tested by mulu & Tsiqe Date 6/11/97 n I Checked by Care Abraham Asscfa/ — TL 3/12/97iw O/Prcj No JUT [Date fSamc^eib j ] P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Client : Baro-2-Dam site ARDCO PLC Location: Bare river Descriptor.: Greyish clayey silt with sand TP/BH B2-NTP-D1 Depth (m) 0.35 * 0.65 GRAIN SIZE DISTRIBUTION [Specific gravity j 2 58 | i Cookie Gravel Size Sand Size Fine Grained Coarse jMroiumj F-f-ft Coarse j Medrun ] Fir-e S-Z9 Car Size | I rx 1 ----- — ,, —X \ 1 t XXX X 1 —4 x 1 1 __ X1 I J I I ’1 i j 1 1 •o ‘0* CO1 0 03 _- ____O_G_OO1» Grain Size (mm] Tested by: Date : Checked by' Date: 3/12/97WO/PrO| NO Date C1281 22HG/97 D= • DPIWU. Mia P.O, Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Baro-2-Dam site Client : ARDCO PLC Location- Baro river Description: Red to brown sandy clay with some silt TP/BH B2-NTP-O4 Depth (m) 1.45 -1.75 GRAIN SIZE DISTRIBUTION jSpecific gravity | 2 j Gram Size (mm) Tested by: Date : Checked by; Date: Tsiqe &.Abraham 8/11/97 Abraham Asscfa 3/12/97 ^ 8ru<Xfflf/rApnroved by fWO/Prq No Date aw jSarcpielD | P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 materials testing department and foundation investigation departement project Baro-2-Dam site Client : ARDCO PLC Location: Baro river Description: Dark greyish silty sand with clay ___________ ____________ GRAIN SIZE DISTRIBUTION [Specific gravity | 2 a | TP.'BH B2-NTP-Q2 Depth (m) 07-10 Cvboie Gravel Size Sand Size CoarseM] ccumj F.p oCoarse | | Fmc Fine Grained Sit -00 -• 1 'l 90 _ L \ \ i .■ » i j 1 1 cc V) c Q. c •I uI d i; Q. -------- \ —V \ \ k .1 1 ! i 1 < 1 ,Jf T J. t 1t I i 1 ____ 1___ !___. Gram Size (mm)WO/Proj No 0^281 Date 22/W I Sample ID G5W/258 P.O. Box 40036 Tel 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT ANO FOUNDATION INVESTIGATION DEPARTEMENT project Baro-2-Dam site Client : ARDCO PLC Location-. Baro river Description: Light brown silty sand with some clay _____________________________ GRAIN SIZE DISTRIBUTION Specific gravity FF1 TP/BH B2-NTF-D2 Depth (m) 0.3 - 0.6 Tested by Date Chocked by Dau mulu & Tsiqe 6/11/97 // Abraham Asset a I/ ^97•/v O/Prq No Date C'.M? 22HO97 P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Baro-2-Dam site Client ! ARDCO PLC Location: Baro river Description: Dark greyish silty sand with day TP/BH B2-NTP-Q2 Depth Im) 0.7 -1.0 GRAIN SIZE DISTRIBUTION jSpecific gravity | 2 49 | tested by; Date . Checked by* Date:W O/Proj No •J<281 Date 22rW (Sample ID | | P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Client : Location: Description; Baro-2-Dam site ARDCO PLC Baro river Light brown silty sand with some clay TP/BH B2-NTF-D2 Depth (m) 0.3 - 0.6 f )Specific gravity_________ z grain size distribution | Tested by mulu & Tsiqe Date : 6/11/97 /j Checked by Abraham Assefaj/ Date 3/12/97W C/PrQj No C’^1 Date [Sample ID 1 | P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Boro*2-Dom sito Client : ARDCO PLC Location: Boro river Description: Tost type Sieve Analysis TP/BH B24HP-O5 Depth (m) 0 50 GRAIN SIZE DISTRIBUTION [Specific gravity j ] . Connie I Gravel Size torse |r.: a.um| f Fine Grained 3 |.................... . ■ \ i I • ! \ • \ \- 1 \ I \ V \ ! \l Si 9 i 1 i • Grain Size tmni| Tested by Date ; Checked by: Date. Anlev Abebe 5/11/97 /i Abraham AsscLy 3/12/97 Approved by •?e \Datc o »*W O/Proi No Date Mint r.w | Sample ’0 G* $9*3% 0. Bo* 4QQ36 T®1_ CK)SlS-42Q6Q1 FAX tZSW) 42 QI 53 MATERIALS testing QEPaRTMENT a\d PQMNCAlTCTt. lKYES' K5ATtQN, QEPARTEMBXT r 5^W«WS;tB Ciwc ^ussfcfcr. TtescwSfite-. Sknatess TPJSS S2ATP-C3 &c®Sh pn, 0 45 ^m$e£as?^sg!7o*i (IL 'A' 0/P'Oj \’o 3*25* • Date 22H(X®? | Sample ID GS-6-V.297 I P.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Baro-2-Dam site Client : ARDCO PLC Location: Baro river Description: Test type Sieve Analysis (Specific gravity | TP/BH B2-NTP-Q7 Depth (m) 0-45 GRAIN SIZE DISTRIBUTION fa Tested by Oate AnleyAbeb/Xj 5O2Z |J-<' '* Approved Date Chocked by: Abraham Asscfa Dale 3/12/97 ~T .W O/Pro). No 012a-. Date 22/50/97 [Sample ID | Gs»6/97t^7~| r.O. Box 40036 Tel. 420616-420601 FAX (251-1) 42 01 S3 MATERIALS TESTING DEPARTMENT AND FOUNDATION INVESTIGATION DEPARTEMENT project Client : Location: Description: Test type Baro-2-Dam site ARDCO PLC Baro river Sieve Analysis TP/BH 82-NTP-Q6 Depth (m) 0.30 ., [Specific gravity | GRAIN SIZE DISTRIBUTION - | Tested by' Date * Checked by Date Anley Abeba ftiJ 5/11/97 7 Abraham Asset Approved by Date 3(12/97 h'woaks to Date F?M 22 m" [Sams* O MATERIALS TESTING DEPARTMENT ANO FOUNDATION INVESTIGATION DEPARTEMENT DIRECT SHEAR TEST RESULT Project Baro-2-Dam site Client ARDCO PLC Location Baro river Object Sori Sample Test Type :• Consolidated Undrined 1. SPECIMEN DATA TP /BH N* B2-NTP-Q3 Depth (ml 0.85-1 15 Initial height (mm) 20.00 1 Initial area (Cm 1 38.00 Initial Weight (gm) 138.25 Final dry Weight (gm) 115.98 Moisture content 1&J1 Sample No Sample condition Specimen Sue (mm) : Initial volume (cm*i (Bulk density igmcm') Dry density (gntfcnf; 5pecdic gravity i Recompacted . 60*60x20 72.00 1 920 1 611 250 Homi/k ........ Normal stress (KN'mh 100 200 300 C(KN/m l 1 0t Degrees' : Shear stress (KNim'l 88 102 i 156 «7 j <9 , * c uc ?• nW 0iP(0| No Date 01281 22/10/97 |Samr,felD j D-6/97nO2~| i-STVNG DEPARTMENT AND INVESTIGATION departement DIRECT SHEAR TEST RESULT Baxo-2-Dam site ARDCO PLC Baro river Soil Sample Consolidated Vndnned :iMEN DATA IT B2-NTP-Q4 I (Sample No i 2i 1 V45-V7S \ [Sample condition irnghl lmm| | Recompacteri 20.00 \ [Specimen Sue (mm) 1 area (Cm ) 60x60x20 L 3600 l (Initial volume (Ctn*| Weight lgm\ 72.00 i 133.67 1 iBulk density Igm/cm*) 1.326 Or* Weight tgm) \ 107 .47 \ [Dry density (gmlcm'l 1433 lute content (Y»l I 2S.03 \ (Specific gravity 2 SO atk ---- -------------------- 1 rmal stress tKNtm ) \ 100 I 200 300 I C (KNJm’l O( Degreesl *ear stress (KN(m‘) \ 30 137 19A 30 _____ letoy Date Checked by - Oat« Antey fcbebe 5 AH 1(97 '"'ft Abraham Asseia j 03^2137P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 materials testing and foundation investigation department ProjectBaro- 2- Dam Site Client ARDCO Pic. Location :* Baro River COMPACTION TEST W.O.No: 01281 Date : 22/10/97 DescriptionSoil Sample Type of Compaction Modified Maximum Dry Density (Kg/m ) :• 3 1866 Sample No.B2- NTP- Q3 (A) Natural Moisture Content (%) 0 05 Optimum Moisture Content (%) 23.07 Dry Density Vs Moisture Content Tested by;- Isayas Domilo Date-.- 28/11/97 Chocked by: Abraham Assefaf Zr proved by Date;- 04/12/97 ->P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project Client Location :• W.O.No: 01281 Date : 22/10/97 Baro- 2- Dam Site ARDCO Pic. Baro River COMPACTION TEST Description :- Soil Sample Type of Compaction :- Modified Maximum Dry Density (Kg/m’l 1753 Sample No.:- B2 - NTP- Q2 Natural Moisture Content (%) 7,84 Optimum Moisture Content (V.) 15.50 Dry Density Vs Moisture Content Moisture Content (%) Tested by:- Getachew Haile Date:- 28/11/97 Checked by Abraham Asset: Date:- 3/12/1997P.O. Box 40036 Tel. 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro- 2- Dam Site Client : ARDCO Pic. Location: Baro River COMPACTION TEST W.O.No 01281 Date : 22/10/9 7 Description:- Soil Sample Type of Compaction modified 3 Maximum Dry Density (Kg/m ) Sample No.B2- NTP- 04 (A) Natural Moisture Content (%) 17.60 1648 Optimum Moisture Content (%) 2fcP0 Dry Density Vs Moisture Content■X w 0a. ... _ _ ' —oqx 400^8 Tel 42 0613-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project > Ban> 2* Dam Site CM > ARDCOPIc. Location > Baro Rhrer COMPACTION TEST W.O.No: 01281 Date : 22/10/97 DescriptionSod Sample Type of Compaction :• Modified Maxwnum Dry Density (KgfmJ 1858 Sample No. :• H2- NTP- Q3 (B) Natural Moisture Content (%) 0-94 Optimum Moisture Content {%) 23.S9 Dry Density Vs Moisture Content Moisture Content (•/•) Tested by:- Isayas Demilo ^-•-'''-Ic'T^.Approvcd by :• _ Da '«-- 28/11/9/ ChecJted by Abraham As» fj z W •••.. ..<7x7/7? O £ Z- * * / a il X V »•* » *# c r,’ i*» 6' » »P.O. Box 40096 TH 420616 *420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro-2-Dam sit© Client : ARDCO PLC Location: Baro river Specimnn data BEFORE TEST Prpj hf : 01211 Date Z2HW BH N" DEPTH • *'« Weight of sample & Ring (gm) 295.55 Specific Gravity (GJ 2.50 Weight of Ring (gm) 112.08 Sample Diameter (O) (mm) 75.00 Weight of sample (gm) 183.47 Sample Thickness (HJ (mm) 20.00' Weight of Dry Sample (gm) 152.42 2 Area (A) (cm ) 44 16 Weight of Initial Moisture (gm) 31.05 4 Volume (V) (cm ) initial Moisture content (MJ {%) 20.37 3 Bulk Density (pj (gntfem ) 88.31 2 078 Swell Pressure (KpaJ 20 Dry Density (pj (gm/cm’) 1 726 [initial Void Ratio: e = (G>/p )-1 ad 0.449, [Height or Solids : H, = H^(1«e.) (mm)| 13.807] | Initiai Saturation : S = (M^G^e* (%) j c 113.55] AFTER TEST Weight of Sample ♦ Ring +Can (gm) 293.50 Overall settlement (mm) ■fbsol Weight of Dry Sample ♦ Ring *Can (gm) 275.00 3 Volume change (cm ) 9.06 Weight of Ring ♦ Can (gm) 122.58 5 Final Volume (cm ) 79 26 Weight of Wet Samplo (gm) 170.92 J Anal Bulk Density (gm/cm ) 2 156] Weight of Dry Sample (gm) 152.42 3 Final Dry Denssity (gm/cm ) 1 923 Weight of Anal Moisture (gm) 18.50 Final Void Ratio: to) I0 300 Final Moisture Content (M ) (%) f 12.14P.O. Box 40036 Tel 42 06 13-16 66 17-16 48 46 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro- 2- Dam Site Client : ARDCO Pie. Location: Baro River COMPACTION TEST W.O.No 01281 Date : 22/10/97 Description:- Soil Sample Type of Compaction modified 3 Maximum Dry Density (Kg/m ) 1623 Sample No.B2- NTP- Q4 (B) Natural Moisture Content (%) 15.60 Optimum Moisture Content (%) 28.25 Dry Density Vs Moisture Content Moisture Content (%)P.O. Box 4WH Tel. 42061 J-42t401 FAX 1251.11 <2 01 53 VUSALS TESTING ANO FOUNDATION WVSlIGATlOM DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD - TIME SETTLEMENT REAPINGS Project: Baro>2<Oam site Client ; ARDCOPLC Location*. Bare river BH N* BJ NTF-Q2 DEPTH 3 Tt 1 ©0 Sample diameter (D) 75.00 mm Area (A) 44.10 cm7 ]Sample thickness (H) 20 00 mm . Lever ratio I9I' TKg on hanger gives pressure o!: 20 Kpa LOADING 1 H/1MT 4 1MVW S an vw |ioia Tested by. gmybcl Worteneh Date: HKif97 Checked by: Abraham Msela Date: WIW cchecker by Dale :_________ Approved by Date _ OONE > DIMENSIONAL CONSOLIDATION TEST CALCULATION SHEET Project Chenl Location Baro-2-Oam site ARDCOPLC Bare river BHN* DEPTH Voids Ratio COMPRESSIBILITY COEFFICIENT OF CONSOLIDATION c. ------------ , 20.000 19302 19.626 19 214 18.750 11.227 17 638 16.975 18.982 17.307 Tested by. Date Checked by Date. Emebet Wpfkcneh 11/11/97 Abraham Aygla 18/11*97 c checked by. Dato : ______ Approved by.P.O. Box 40036 Tel. 420616 - 420601 FAX (251-1)42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: BafO'2*Dam site Client : ARDCOPLC Location: Baro river BHN* ; B2-NTP-Q2 DEPTH 0 70-1.00 SQUARE ROOT TIME VS SETTLEMENT Tested by Date: Checked by: Abraham Abs< Dale: Emebet Workeryh 11/11/1997 /| __________ ------- kM 18/11/97 ZF •• c checked by Date :____________ Approved by : Datr /7UZTFWUi S TESTING ANO FOUNDATION WVtSUGATKJN DtFMHMI NI ONg DIMENSIONAL CONSOLIDATION JEST LOAD • TIME SETTLEMENT READINGS Project Client : Location*. Baro-2-Oam site ARDCOPLC fiaro nver BHN* depth WFCI iN'« Sample diameter (D) Lever ratio I 75.00 mm IL A/ca |A) 44.16 cm7 [Sample thickness (HL IKg on hanger gives pressure oLL UNLOADING 1 mW I Frotorv Cumulative compression Cumulative cocaprmion CumuUnvr cOfftprtiikxi Cumulilfvc cdnpfMiiop CunwXlttw Ctx,»prwMOO CuourtiUve compiwsion Cumulative comprw'ao 3 025P.O. Box 40036 Tel. 420616 " 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCOPLC Location: Baro river BH N° B2-NTP-Q2 DEPTH 0 70-1.00 SQUARE ROOT TIME VS SETTLEMENT | 0 560 E. 0 670 C 0660 g 0 690 O 0 700 ? 0 71C CO 0 720 Square root time (min) Tested by Emobet Workench Date: 11111197 Checked by: Abraham Assefa Date: 18/11197 , cchecked by: <Pate :___________ -*• Approved by date: * / k420! S3 —I INVISTIGAT10N DEPARTMENT Project: Client . vocation: site AROCO PLC Baro river BH N* ; B2-NTP-Q2 DEPTH : 0.70-1.00 Prossure^^Kpa = -5l_Slrnin Square root time (min) Tested by Date gmebet Wprkeneh 11/11/1997 _____ Checked by: Abraham Asscfj Date 18/11/97 ■• ■ ‘-v .P.O. Box 40036 Tel. 420616 - 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INSTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location; Bare river BHN’ : B2-NTP-Q2 DEPTH : 0 70-1.00 EE EE 1250 I 300 1 350 1 400 1450 1 500 •-* cc oo 1 550 f •* 1600 oo CcOo 1 650 1 700 f 1 BOO 1 S5<i 1900 SSqquuaarree rroooott ttiimmee ((mmiinn)) Tested by Date*. Ecnebct Workcnc 11/11/1997 _____ c chocked by, : Checked Date: by: Abraham Assefa 18/1 *• Xpprovcd by :_______ . :U. r 7 /• «. .-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVIST1GATION DEPARTMENT Project: Baro-2-Dam site Client : ardco PLC Location : Baro river BH N° : B2-NTP-Q1 DEPTH ; 0.70-1.00 SQUARE ROOT TIME VS SETTLEMENT Square root time (min) 54 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client J ARDCO PLC Location: Baro river BHN° : B2-NTP-Q DEPTH : 0.70-1.00 SQUARE ROOT TIME VS SETTLEMENT Square root time (min) Tested by Date: Emebct Workench 11/11/97 Checked by Abraham Assefa Date: 16/11/97materials testing and1 foSto^£st!g^ ’reject: Baro-2-Dam site silent : ARDCO PLC -ocation: Bare river ----------------------------- ---— ___________________________ BH N’ : 82-NTP-Q2 DEPTH : 0.70-1.00 SQUARE ROOT TIME VS SETTLEMENT «o SSqquuaarree rroooott ttiimmee ((mmiinn)) i ------------ t ested by Emcbet Workeneh Date: 11/11/1997 Checked by: Abraham Ass of a Date. 18/11/97 \ c chocked by: * Date : ' Approved by : Date:MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project : Baro-2-Dam site Client : ARDCO PLC Location; Baro river BHN° : B2-NTP-Q2 DEPTH : oro-100 COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE Tested by Date: Checked by: Date: Emebet Workeneh 11711/97 Abraham Assefa 18/11/97 C, checked by: Date Approved by :- rvA I i JU ==- P.O. Box 40026 Tel 420616 - 420601 FAX (251-1) 4201 53 MATERIALS TESTING AND FOUNDATION INSTIGATION DEPARTMENT Project: Baro-2-Dam site Client ; ARDCO PLC Location: Baro river BH N° : B2 NIP 02 DEPTH ; ojo-i oo Tested by Dale: Checked by: Date:Ll ^2’------------1 P.O. Box 40036 Tn. 420616 - <20601 FAX (251-1) 42 01 53 MATERIALS TESTING AMD FOUNDATION WVISHGATJON DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project : Baro-2-Oam site Client : ARDCO PLC Location: Ba ro river Specimen data BEFORE TEST ProjN* 012S1 Date 22fiO/»? BNN* •:*'*** DEPTH Weight Of sample & Ring (gm) | 262.08| Weight of Ring (gm) 1 111.471 Weight of sample (gm) 150.611 Weight of Dry Sample (gm) 129.421 r S pacific Gravity (GJ 'Sample Diameter (D) (mm) Sample Thickness (H.) (mm) Area I A) (cm*) . Weight of Initial Moisture (gm) 21.19 volume |V) (cm*) Initial Moisture content (M ) (%) f 16.37| 1 Bulk Density (pj (gnvcm ) Swell Pressure (Kpa) ___ !i Dry Density (pj (gm/cm*) 2.50 75.00} 20 00 44 16j W.3l] 1 705 i ass: ae [Initial Void Ratto : ce - (G /p )-1 0.706) [Height of Solids : H, « H^(1*eJ (mm); 11.724) [initial Saturation ; S ~ (M/GJ/e. (•/.) | o 57.98 ( AFTER TEST Weight of Sample ♦ Ring *Can (gm) 262.00 Weight of Dry Sample ♦ Ring *Can (gm) 252.00 Weight of Ring * Can (gm) 122.58 Weight of Wet Sample (gm) 139.42 j Weight of Dry Sample (gm) 129.421 Weight of Final Moisture (gm) 10.00) Over afl settlement (mm) 1 Volume change (cm ) 3 Final Volume (cm ) Final Bulk Density (gm/cm’) 3 Final Dry Density (gmfcrn ) Final Void Ratio:!®,) 6 072 i 28.»l| 61.50- 2 26T j 2.104} o isii Final Moisture Content (M,) (%) [Final Saturation : S, g(Mf*Gj/e • (%) t 102.75] Tested by □ate: EnwtetWoriceneh 11/11/97 Chocked by. Abrnham Asscfa Doto: 18/11/9? c checked by D*« Approved by . Date ) j J.KU. BOX 40035 Tel. 420616 - 420601 FAX (251-1) 42 01 53 MATERIALS TESTING ANO FOUNDATION INVlSTlGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location: Baro river BHN°: bijhp-qj DEPTH : 0.70-100 e,= 0.277 e2 = 0.229 P.= 1280 Pi = 2560 Cc» (e»-c )Zlo9(P^J ? 0.160 7 PRESSURE <KN/cn ) i I z---! PO 801 «0W4 T®t4W8lf .42«01FAX|:si ih:01 w MATERIALS TESTING ANO FOUNDATION ■WDGATiQN DtPAKTUeNT ONE DIMENSIONAL CONSOLIDATION TEST LOAD . TIME SETTLEMENT READINGS Project : Baro*2>Dam site Client | ARDCO PLC L oca bon- Sara river bm n* aa-NTPQ: DEPTH 51* 1 is Sample diameter (D) 76.00 mm Area (A) 44.16 cm* Sample thickness/H} 2D 00 mm Laver ratio 9—1 1— 1Kg on hanger gives pressure of ” JftL LOADING Increment N* t 12 1» 4 6 j!I 7 J------ ! DM* tUrtetf ZSHMT Wno-v V1VT7 8114/ nwt 4. t W SI V»? Load Ko 1 40 I 19 2 |, 4 1 ’.M 324 U9 22 4 €4 ue IPreitUfC KM 20 2S44 CurvuLMve • CuMutaOw C <OR>f|nlM i; lee 1 ruvpfiian Eupxee time h m s It |min)| vt CmnmUUw compression ran AH AH AH SnWUl AH Contpecfcsxon mn» aH AH 1 Ml 2196 34331 5071 r- AJI 01 0 i 0 0.000 1.0721 1.271 1.629 6 6351 1 15 0.25 i 0.50 0.298 1.146 1.439 2.031 3306 4 34£| 5 799 T-fiSjl 30 0 5| 0.71 0.336 1.158 1.455 2.060 3316 <366T BA49 7 573 1 11 1.00 0J87 1.170j 1.470 2-091 3.326 44001 6.901 7 606 2 21 1.41 0.475 1.1821 1.484 2.114 3J46 4 4541 5.949 7 644 4 4 zoo 0370 1.194J 1.506 2.130 3369 4320? 6.029 7.697 8 8 r 2.83 0672 1-206 1.526 2.141 3.383 4397 1. 6 102 7 8001 — 15 15 3.87 0.790 1-216 1.543 2.152 3393 4 6611 6.178 7.89V 30 30 5.48 0.871 1.228 1 "= 1 15601 2.161 3.403 4.7231 6.280 7.967} 60 775 0.935 1241 1570 2.169 3.411 4 7821 636C 8.03 V J 2 120 10.95 0.978 1-252 1-580 2.1761 3.416* 4 850 6 4171 «.083j 4 240 r 15.49 1.005 1261 1.590 2 181 3.423 4-920 64801 8.113 ---------------’ 8 480 21.91 1.023 1.265 1.602 2186 3.428 <986 65001 8 125 J 24 “1 r 1440 37.95 1.072 1.271 1.629 2.196 3 433 5-078 6 6351 6 125 1 <81 2880 53.67 i. 4320 65.73 72 Her curauiMhre compression | Ml | 1.072 1 271 1.629 2.196 3<33 5.0781 1 6.635 1.125 Tested Date: Checked Date: by; Emebet 11/11/97 by. Abraham 18/11/97 Workeneh Asset* / V Approved by Co .1 P.O. Box 40036 Tel. 420616 - 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client 1 ARDCO PLC Location: Baro river BHN* : B2-NTP-Q2 DEPTH : 0.85-1.15 SQUARE ROOT TIME VS SETTLEMENT (min) Tested by Emebet Workenoh oj\c checked by: Date; 11/11/97 j Checked by Abraham As sc I a L Date: 18/11197 A *a*MATERIALS TESTING AMD F GUN DA TO H INV1STOATON DEPARTMENT ONE DIMENSIONAL CONSOLIDATION TEST LOAD . TIME SETTLEMENT READINGS Project : Baro-2-Dam ske Client ARD CO PLC Location: Baro rtver 0HN* B2-NTP-Q3 DEPTH : 0.8S-1.1S Sample diameter ID) 75.00 mm (Area (A) 44.16 cma [sample thickness (H) Lever ratio 5 1 1 h Kg on hanger gives pressure ol: UNLOADING ____________ 20.00 mm 20 Kpa /Z2 EmeDet Workeneh c checked by Data Checked by 1131/97 Abranatn Assefa Date :•________ Approved by: - Date 1831/97 f 4VP.O. BOX40036 Tel. 420616-420601 FAX (251-1) 4201 53 MATERIALS TESTING ANO FOUNDATION INVI5TIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCOPLC Location: Baro river BHN' : B2-NTP-Q3 DEPTH : 0.85-1.15 I SQUARE ROOT TIME VS SETTLEMENT :450 1 460 1 470 1 480 1 490 Tested by Date: Emebet Workeneh 1m1m/1i13/31f 997 Chcckod by: Abraham Assefar/ Date: 18/11/97 c checked by: Date : e, - ft Approved by .I Materials testing ano'inVistklltioh department Project; Baro-2-Oam site Client : ARDCO PLC Location : Bare river BHN° ; B2-NTP.Q3 DEPTH : 0.85-1,15 SQUARE ROOT TIME VS SETTLEMENT '30 ^Square root CiAW&jn) T osted by Date: Emebet Workeneh 11/11/1997 ?. Checked by: Abraham Dale. n AAxxsseeffaa L' ./ <Jctfnn zP.O. Box 40036 Tel. 420616.420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location: Baro river BHN° : B2-NTP-Q3 DEPTH : 0.85-1.15 SQUARE ROOT TIME VS SETTLEMENT i I i i I iBox 40036 Tel. 420616 - 420601 FAX (251-1) 42 01 53 ER1ALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT >ject: Baro-2-Dam site ent ; ARDCO PLC cation: Baro river BH N* : B2-NTP-Q3 DEPTH : 0.85-1.15 ?OOD-| 2 040 2 050 2Q60 2 070 HOC E 2 120 Q 2 140 c o 2H 2 ;eo 22 24 rCCKbl 4 [U ■ Li l P.O. Box 40036 Tel. 420616 - 420601 FAX (2514) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location: Baro river BHN* : 3244TP-Q3 DEPTH : 0.854.15 SQUARE ROOT TIME VS SETTLEMENT 5 600 5 700 6 c a E Q> 6400 Q> (/) 6 20 22 24 2C Square root time (min) Testad by Emebet Workeneh Date: 11/11/1997 >1 Checked by: Abraham Asset a h Date: 18/11/97 / Zr / > cf it r. a .O. Box 40036 Teh 420616 -420601 FAX (251-1) 42 01 53 VIATER1ALS TESTING AND FOUNDATION INV1STIGATION DEPARTMENT Project; Baro-2-Dam site Client : ARDCO PLC Location : Baro river BHN* : B2-NTP-Q3 DEPTH 1 0.85-1.15 SQUARE ROOT TIME VS SETTLEMENT Square root lime (mln)<O. Box 40036 Tel. 420616 - 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location: Bare river BHN°: B2-NTP-Q3 DEPTH : 0.85-1.15 VOID RATIO VS LOG PRESSURE 0.550 I < O' Q 0400 0350 5 0300 > 0250 PRESSURE (KN/m'J Tested by Date: Checked by: Date: Emebet Workeneh 11/11/97 Abraham Assefa 18/11/97 C. checked by: Date : Approved by : Date: // . V>:& P.O. Box 40036 Tel. 420616 - 420601 FAX (251 -1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location : Baro river BH N° : B2-NTP-Q3 DEPTH : 0.85-1,15 SQUARE ROOT TIME VS SETTLEMENT Square root time (min) Tested by Emebet Workcneh □ate; 11/11/97 Checked by: Abraham Assefa Date 18/11/97II P.O, Box 40036 Tel. 420616 - 420601 FAX (251-1/ 42 0153 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Client : Location: Baro-2-Dam site ARDCO PLC Baro river BHN°: B2-NTP-Q3 DEPTH : 0.85-1.15 VOID RATIO VS LOG PRESSURE H 0400 < DC 0 250 *ls 0.140 *2* O.O13 P,= 1280 P3” 25SQ 5 0300 Q Cc- (o,<2xbg<P?P<l Tested by Date: Emebet Workeneh 11/11/97 , Checked by: Abraham Assefa Date: 18/11/57 7 C. checked by: Date e Approved by ____ Date: _____ / jf.rfcCcP.O. Box 40036 Tol. 420616-420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INV1STIGATION DEPARTMENT Project : Client : Location: Baro-2-Dam site ARDCO PLC Baro river BH N° : B2-NTP-Q3 DEPTH : 0.85-1.15 COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE Tested by Emebet Workeneh Date: 11/11/97 ___ Checked by: Abraham Assef Date: 18/11/97 C.checked by: Date •/^/Approved by :- // i ■ I/O<l] 8.0. Bom 400M Tet 420CtC• 4X401 FAX f241-1| 42 01 W MATERIALS TESTING AND F0WDA1W MVtSDGATlON DEPARTMENT ONE - DIMENSIONAL CONSOLIDATION TEST CALCULATION SHEET Project : Baro-2-Dam srte Client : ARDCO PLC Location: B>ro rhrtf [Sample dtameter (D> 'HelQhl lOlidS Hs . Voids Ratio BHN* DEPTH vr Ca • M • r* 7500 mm [Height Hp___________ 11.452 mm jinitol Voids ratio e. COMPRESSIBILITY i3KXj-iia» 20.000 19394 18 980 18.174 17 167 16.138 15.059 13.823 12.597 13.032 13313 13.928 0404 0.711 0.458 0387 ' 1.007 I 1029^ 180 _____ 1 079 320 0.209 1.225 15.717 19.292 18 582 17.871 16453 15 599 14.441 n.2io T wtc<l by: Emebet Workenph Date: 11111J97 Checked by: Abraham Asseta c checked by Date . ________ Approved by:P.O Boi «03« Tel 420CU - 420601 FAX |ZST •!) <2 01 S3 MATERIALS TESTING AND FOUNDATION INVtSHGATiON DEPARTMENT Proj. N* . 01281 Date: 22M0T97 ONE DIMENSIONAL CONSOLIDATION TEST DATA SHEET Project ; Baro-2-Dam site Client : ARDCO PLC Location Bara river BH N*: Specimen data BEFORE TEST DEPTH: Weight of sample & Ring (gm) 264.02 Specific Gravity [GJ 2.50! •Weight of Ring (gm) 112.15 Sample Diameter (D) (mm) 75.00 Weight of sample (gm) 151.87 Sample Thickness (HJ (mm) 20.00 Weight of Dry Sample (gm) 126.42 2 Area (A) (cm ) 44.16 Weight of Initial Moisture (gm) 25.45 3 Volume (V) (cm ) 88.31 Initial Moisture content (MJ (%) 20.13 3 Bulk Density (pj (gm/cm ) 1720I Swell Pressure (Kpa) 7 3 Dry Density (pj (gm/cm ) ’■«2J ''oid RaVo: e* - (GJrJ-1 ilnrtial Saturation . S = (M/GJfc* (%) o H.452] 6M3j AFTER TEST Weight of Sample ♦ Ring ♦Can (gm) 260.00 Over all settlement (mm) 6.072 Weight of Dry Sample ♦ Ring *Can (gm) 249.00 3 Volume change (cm ) 26.81 Weight of Ring ♦ Can (gm) 122 58 3 Final Volume (cm ) 61 SO Weight or Wet Sample (gm) 137.42 1 Final Bulk Density (gmfem ) 2.234 Weight of Dry Sample (gm) 126 42 3 Final Dry Denssity (gm/cm ) 2.056 Weight of Final Moisture (gm) 11.00 Final Void Ratio:(e ) r 0.216 iFmal Moisture Content (MJ (%) 8.70 Tested by Date Cn^tM-dby Dree Emebef Woritcnefi 11Hig7 Abraham Assefa 1I/1V97 c checked by: Dale _______ Approved toy 0a!tP.O. Bei <0034 TH 4M6M’420tflFAXpS1-V 42 01 M MATEftlAU TtSrtHG AND FOWMTION UM5DGA1KW DtPARTUE Vf ONE dimfnsiqnal consolidation test LOAD ■ TIME SETTLEMENT READINGS Prefect : Bar&l-Oim site Client t ARDCO PLC Location: Baro river BHN° depth Sample diameter (Of 75.00 mm (Area (A) 44.1S cm; Sample thickness Lever ratio 1 9 J 1 |1Kg on hanger gives pressure of . UNLOADING 2000 20 Kpa foicrtmtnl N* 1 J 2 4 0 1 T iDjft SUrtcd nitdT •*■!!<>/ ♦flUW ___ Xg iPreyiuit Kp» — 440 Mi A 2 tw * ____________ ____________ CunkjUltv* CumuMnv CuoraUUM CwmUOwI raopcmkm EupMd tKTTC Tested by. Emcbet Workgneh Date; 11/11/97 / Checked by: Abraham As sola !• cchecked by Dale > Apjwoved by - Date > -« IPOBaxUC* T* «mW-4»IC1FAxiiiJ-i) e 61 O UXrtWALS T«$TWG ANO KWMUTMX ■NOUGATO* OLPARTNtX? ONE DIMENSIONS. CONSOLIDATION TEST LOAD . TIME SETTLEMENT READINGS Project Baro-2-Dam see CHtrx : ARDCO PLC Location Biro rwer BHN* B2NTP-Q4 DEPTH 1.411 ’5 (Sempk- diameter (0) 75.00 mm Area (A) 44.16 cm* (sample thickness (H) 20.00 mm I Lever ratio 1511 1Kg on hanger gives pressure of. 20 Kpa I LOADINGrn4 ^OM«n>uc'>pu of »a» ’.0. Box 40036 TeL 420616 - 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVESTIGATION DEPARTMENT Project: Baro-2-Oam site Client : ARDCO PLC Location: Baro river BH N* : B2-NTP-Q4 DEPTH 1.4S-1.7S SQUARE ROOT TIME VS SETTLEMENT ~ 0940 5 0970 ^OQjyjjric (mln) Tested by Emebet WorkonN Date; 11/11/1997 5 checked by Checked by: Abraham Assets Djtt> :________ Date 18/11/97 Approved by : °**( —uI IATER^s^STINC amh V ^ 4 20601 FAX 42 01 53 AND FOUNDATION INVESTIGATION DEPARTMENT ’reject: Baro-2-Dam she ‘Jient : ARDCO Pte .ocation: Baro river BH N° : B2-NTP-Q4P.O. Box 40036 Tel. 420616 " 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Client : Location: Baro-2-Oam site ARDCO PLC Baro river BH N° : B244TP-Q4 DEPTH : 1 45-1.75 SQUARE ROOT TIME VS SETTLEMENT Square root time (min) Tested by Emebct Workeneh Dale: 11/11/97 Checked by: Abraham Assef^ Date: 18/11/97 J cchecked by. ate (Approved by Date:--------4Z0601 FAX materials testing and foundation (251-1) 42 01 53 invistigation department Project: Baro-2-Dam site Client : ARDCO PLC Location : Baro river BHN” : B2-NTP-Q4 DEPTH : 1.45-1.75 SQUARE ROOT TIME VS SETTLEMENTdepar™ent Project: Client Locati : on: Baro-2-Oam site ARDCOPLC Baro river BH W : B2-NTP-Q4 DEPTH 1.45-175 sn .MQP ROOT TIME VS SETTL EMENT r 18 2? 24 Square ro ot time (min) Tested by Emebet Workanoh c Date: 11/11/1997 Checked by. Abraham Assafa approved by: ~ Date: 10/11/97 Q»<« . .-j n *____ FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Baro-2-Dam sito Client .• Location: { ------------------ ARDCOPLC Bare river BH N*: B2-NTP-Q4 DEPTH : 1.45-175 J t I1 SQUARE ROOT TIME VS SETTLEMENT JP.O. Box 40036 Tel. 420616 • 420601 FAX (251-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INV1STIGATION DEPARTMENT Project: Baro-2-Dam site Client : ARDCO PLC Location: Bare river BH N° B2-NTP-Q4 DEPTH 1 45-1 75 Tested by Date: Checked by: Date: EnwbetWorkeiteh 11/11/97 - Abraham Asset// 18/11/97 7 I *> • * \ V'v- % \ c checked by •V\D«e_____________ Approved by:____ __ z/ •*»< • 4—1 P.O. B^x 40036 Ti cc^f E Project: Baro-2-Dam site Olent : ARDCO PLC Location; Bare river -------------------------------------------------------- BH N° : B2-NTP-Q4 DEPTH : 1.45-1.75 SQUARE ROOT TIME VS SETTLEMENTEL rr-»/r* CON»T"UCVIO'J rirBJOX *O-u PP..OO.. BBooxx 40036 Tel. 420616 - 420601 FAX (251-11 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project : Baro-2-Dam site Client : ARDCOPLC Location: Baro river BHN° : B2-NTP-Q4 DEPTH : i <5-175 ----------------------- --------------- ------------------------------------- , COEFFICIENT OF CONSOLIDATION Vs LOG PRESSURE Tested by Date: Emebet Workeneh 11/11/97 Checked by: Abraham As-cof C.checked by: Date Date: 18/11/97 Approved by Date: 7/ "•a.n-;P.O. Box 40036 lei. azuoio • *<u vi MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMEN O Project: Baro-2-Dam site Client : ARDCO PLC Location: Baro river BH N° : 8*-*"P<* DEPTH : ' « VOID RATIO VS LOG PRESSURE O < a 0 400 0 050 PRESSURE (KN/m )P.O.Box 40036 TEL 420616, 420601 FAX(251-1) 420153,400621 MATERIALS TESTING DEPARTMENT W.O. N° ,01281 Date 22/10T97 Project: Baro 2 Dam site Client : ARDCO Pic Location: Baro river Test Type: triaxlal (CU) Object : Soil sample SPECIMEN DATA TPIBH NQ B2-NTP-Q4 Sample N° Depth (m) 1.45-435 sample condition Undisturbed Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm ) 2 11.34 Initial volume (cm ) 1 86.15 Initial Weight (gm) 165.24 Sulk density (g/cm’J 1.918 Final dry Weight (gm) 128.2 Dry density (g/cm’J 1.488 Moisture content (%) 28.83 P.R. Factor(KN/div) 0.0022 Remark P = 1/2(0^^) , q = 1/2 (O)- fTj) Chamber pressure I (KN/m2) (tr,) I 100 200 300 C (KN/m ) 2 / Deviator Stress, / (KN/m2) far «>) 258 341 430 53 0 (Degrees) 22 Pore pressure | (KN/m2 40 74 110 100 150 200 250 300 350 400 450 500 Normal StressfKN/m ) 2 P0 P.O. Box 40016 Tol 420616 • 420601 FAX (2S1-1) 42 01 53 MATERIALS TESTING AND FOUNDATION INVISTIGATION DEPARTMENT Project: Client : Baro-2-Dam site ARDCO PLC Location: Baro river BHN°: mw-o< DEPTH : uun VOID RATIO VS LOG PRESSURE O, = 0.207 e2 = o.ioo o 0500 P, = 1280 P2 - 2560 Cc= (er ejJ/logiPj/P,) 0.355P.O.Box 40036 TEL 420616, 420601 FAX (251-1) 420153,400621 MATERIALS TESTING DEPARTMENT \N.O. N° ,01281 Date 22/1OW Project: Baro 2 Dam site Client : ARDCO Pic Location: Baro river Test Type: Trlaxial(CU) Object : Soil sample SPECIMEN DATA TP/BH N° B2-NTP-Q 3 Sample N° Depth (m) 0.65 -1.15 sample condition Undisturbed Initial height (mm) 76 Initial diameter (cm) 3.80 Initial area (cm*) 11.34 Initial volume (cm ) 3 86.15 Initial Weight (gm) 162.64 Bulk density (g/cm’J 1.888 Final dry Weight (gm) 136.22 Dry density (g/cm’J 1.581 Moisture content (%) 19.40 P . R . Factor (KN/div 0.0022 Remark P= l/2(O|+O)) • q = !/2(cri-0>) Chamber pressure, 1 (KNIm2) (ffj) 100 200 300 C (KN/m ) 2 0 (Degrees) I Deviator Stress, > (KN/m2) (0,-crj) 320 437 568 35 29 1 Pore pressure (KN/m2) 1 39 80 140 y = 0 ♦ 35 293 Normal Stress(KN/m ) 2P.O.Box 40036 TEL 420616, 420601 FAX (2511) 420153,400621 MATERIALS TESTING DEPARTMENT \N.O, N° Date ,01281 22/10f97 Project: Bare 2 Dam site Client : ARDCO Pic Location: Bare river Test Type: triaxial ( CU) Object : Soil sample SPECIMEN DATA TP /BH N° B2-NTP-Q2 Sample N° Depth (m) 0.70 J.00 sample condition Undisturbed Initial height (mm) 76 Initial diameter (cm) 3.80 1 Initial area (cm ) 1134 Initial volume (cm’) 86.15 Initial Weight (gm) 170.24 3 Bulk density (g/cm ) 1.976 Final dry Weight (gm) 134.11 3 Dry density (g/cm ) 1.557 Moisture content (%) 26.94 P . R . Factor (KN/div) 0.0022 Remark p = 1.2(0^03) .q = l/2(o o0 r Chamber pressure (KN/m2) 100 200 300 C 2 (KN/m ) 0 (Degrees) Deviator Stress , (aa3) (KN/m2) 273 388 452 55 23 Pore pressure | (KN/mi 47 70 130 Tested by >lsayas Demile Date > 08/08/05 Checked by .-Abraham AsefaP.O.Box 40036 TEL 420616, 420601 FAX ( 251-1 ) 420153 Project •.- Baro 1 B. 2 dam site Client > ARDCO PLC Location: Baro river Test Potential alkaline reaction ( Mortar bar methd ASTM C227) Object :• 4 Rock samples Noto :Cement used for this test is massobo OPC W.q No Date 01566 17/12197 Initial I Initial I 14 days I Sample No length of I guage I guage I specimen! length ’ length I (mm) I reading I reading I Casted I mm I mm 23/9f05 . 24/9P06 | 07/1 OTO 5 1 month V 2 month I 3 month 1 guage l guage I guage I length I length I length 1 I reading 1 I reading I | reading I I mm I mm I mm 23/10f05 I 22/11f05 I 22/105 4 month guaga length reading mm l». month guage length reading mm month guage length reading mm •»( 1 Bl 06 | *12.39 r 20.79 ; ”285 285 2.4780 | 2 3200 ' 2.5240 | 2.3640 I 2.5320 J 2 3740 J 2.5340 | 2.3750 | "2534DI----------- 1 2 3760 1 | B1 T2 *16.62 285 3.6000 3.6400 | 3.6890 | 3.6900 ' 5.6910 | ~ 1 UB'03r9S 1 ----------------J-------------- |---------------- 1] | B1 T5 *36.83 285 3.7100 1 3.7460 3.7900 3.7910 3.7910 | 76.98 285 4.1420 4.1880 4.2420 4,2420 1 4 Z42U | 15.93 i 285 3.756O| $.7840 1 3.8260 ' 3.8280 ' 3.8280 |———|------------------------------------------ | | - -----1-------------- | Baro 2 1 ■ 285 | 2.8960 ? 2.9520 | 2.9860 | 2.9870 | 2.9870 | Quarry 1 I n aAAH l 16060 1 3.5070 1 3.5080 I 1 Initial 14 Days | 1 length of | change length B1 06 Bl T2 Bl T5 Baro 2 Quar 12,39 29.79 19.62 15.93 36.63 76,96 (mm) 285 285 285 285 285 285 285 mm 0.0440 0,0280| 0.0280| 6.0460] month I chango 1 length mm 2 month I change | length 3 month I chango ’ , length mm i mm 4 month chango length mm . 5 month T 1 chango ' 1 length 1 mm 6 month change length [ mm 0.0080 [ 0.0020 1 0.00001 1 1 0.0100 0.0420T 0 Q440| | ' 0,65401 0.0010 0.0010 0,00201 000001 " o,ooi6| o.oopoi o.ooool O.OOOOl 0,0660 [ " 0.03401 0,001 o| O OOOO1 0.0740 | 0.0460] 1 0.001 o| 0.0010 mnnuwTesting of Rock Samples for Alkali- Silica Reactivity (ASR) ______ ___ _____ NORPLAN - NORCONSULT - LAHMtrtK JV in association with Shebelle Engineering and WWDSE Frontpage Annex 4 EdocLAB. NO. ’’U CLIENT PROJECT SAMPLE OF SAMPLED BY SPECIEFIED BY SAMPLE AND TEST ORDER SUBMITTED BY TEST FOR TEST RESULT REPORTED TO NORPLAN ■ NORCONSULT - LAHMEYER JV__________________________________ ______________________________ Rock NORPLAN - NORCONSULT - LAHMEYER JV The Client The Client Potential alkaline reaction (Mortar bar method ) NORPLAN - NORCONSULT - LAHMEYER JV TEST RESULT at 14 days at 30 days at 60 days at 90 days No Sample Code Depth Initial Length mm Initial guage reading mm guage reading mm change in length (%) guage reading mm change in length (%) guage reading mm change in length (%) guage reading mm change in length (%) 1 B1 D6 -12,4 m 12,4 m 285 2,4780 2,5240 0,0161 2,5320 0,0189 2,5340 0,0196 2,5340 0,0196 2 B1 D6-29,8 m 29,8 m 285 2,3200 2,3640 0,0154 2,3740 0,0189 2,3750 0,0193 2,3760 0,0196 3 B1 T2 -16,6 m 16,6 m 285 3,6000 3,6400 0,0140 3,6890 0,0312 3,6900 0,0316 3.6910 0,0319 B1 T2-15,9 m 15,9 m 285 3,7560 3,7840 0,0098 3,8260 0,0246 3,8280 0,0253 3,8280 0,0253 B1 T5 - 36,6 m 36,6 m 285 3,7180 3,7460 0,0098 3,7900 0.0253 3,7910 0,0256 3 7910 , 0 0256 , B1 T5 - 77,0 m 77,0 m 285 4,1420 4,1880 0,0161 4,2420 0,0351 4,2420 0,0351 4,2420 0,0351 4 3aro 2 Quarry 1 285 2,8960 2,9520 0,0196 2,9860 0,0316 2,9870 0,0319 2,9870 0 0319 , 5 3aro 2 Quarry 2 285 3,3860 3,4600 0,0260 3,5060 0,0421 3,5070 0,0425 3,5080 0,0428 REPORTED BY: Lab. Engineer APPROVED BY : Material Engineer ASR rvtuKs Biro diegr M*Initial longth of specimen (mm) 14 days (%) change length 1 month (%) change longth 2 month M change length 3 month <%) change length 4 month (%) change length 5 month w chango length 6 month (*) chango longth U1D6 *12.39 285 O016I 0Gv2d o.oco/ ococo 1 2^79 285 O.Glfc4 O.OC35 C 0004 0.0034 81 T2 •U.62 *28qT aouo "C 0172 ~iwc4 6.0004 15,93 2&r 0.0098 0.0/47 0.0037 o.c6co Bl tF1 *36.63 285 COU&B COCO* odooc 1- 76.98 ”26F ’aoiEF C.G130 d.coco o.flcoc Gero 2 » 285 0oi"Se 0,011$ d.d034 a fidc-3 Quarry 285 C.Q2& 0.0161 d.OCO* o’Mm 1 1 ’ Mixed samples from each depth Tested by Isayas Dmfle Dale 22/12/V5 Checked by:- Abate Lego$s Date :• 23/12/03 Approved by :• _______________ Date > __________________Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 C - Annex 4 E Page vu Soil Tests from the Pre-Feasibility Study Frontpage Annex 4 E.doc NORPLAN - NORCONSULT - LAHMEYER JV in association with Shebelle Engineering and WWDSEExpansion [%] I—+—B1 D6 -12,4m -»-B1 D6-29.8 m B1T2 -16,6 m -M-B1 T2-15,9 m l-*-B1 T5-36,6 m —o—B1 T5-77,0 m I —I— Baro 2 Quarry 1 I —— Baro 2 Quarry 2 DaysBaro Hydropower Projects: BA 1 and BA 2 volume 4 - Annex B Pre-FeasibiGty Study Annex B 3 - 44 BARO-2 SOIL SAMPLE NUMBERING FROM TEST PITS PROFILE OR AREA TEST PIT DESIGNATION NO OF SOIL SAMPLES COLLECTED SERIAL NO OF SAMPLE SAMPLING DEPTH (M) LAB. TES CONDUCTED A-A BA2-A1 2 A-A B-B c-c c-c c-c c-c c-c c-c c-c c-c D-D E-E F-F P-P P-P P-P P-P AREA-G AREA-G BA2-A2 BA2-B1 BA2-B2 BA2-C1 BA2-C2 BA2-C3 BA2-C4 BA2-C5 BA2-C6 BA2-C7 BA2-C8 BA2-D1 BA2-E1 BA2-F1 BA2-P1 BA2-P2 BA2-P3 BA2-P4 BA2-G1 BA2-G1 BA2-G2 1 NS 1 1 1 NS NS NS NS NS NS 1 1 2 3 2.50 5.50 1.50 GS.AL - 4 5 6 GS.AL — GS.AL GS.AL - - - - - - - - - 0.60 1.10 1.80 * - - * - - - - 7 - 1.00 — GS.AL 1 1 1 1 1 2 1 - 8 9 10 11 12 13 14 - 1.40 0.70 0.80 1.00 2.00 2.50 4 50 15 - GSAL GSAL GS.AL GSAL gsal. GS.AL C.D. GSAL.C.D 1.50 GS.AL C.D Note GS 3 Grain Size Distribution AL « Alerberg Limit C = Modified Compaction D = Density NS a Not Sampled Norplan tn association wth Nwonsufl tntemavonai AS.Iropower Projects: BA 1 and BA 2 I - Annex B Pre-Feasiblllty Study Annex B 3 - 43 BARO-1 SOIL SAMPLE NUMBERING FROM TEST PITS profile or AREA TEST PIT DESIGNATION —-------------------- NO OF SOIL SAMPLES Serial no l sampling OF SAMPLE DEPTH (M) A-A BA1-A1 COLLECTED LAB. TES. CONDUCTED A-A A-A B-B B-B B-B C-C C-C C-C c-c C-C D-D D-D D-D D-D E-E G-G G-G AREA-J AREA-J AREA-J BA1-A2 BAI-A3 BA1-B1 BA1-B2 BA1-B3 BA1-C1 BA1-C2 BA1-C3 BA1-C4 BA1-C5 BA1-D1 BA1-D2 BA1-D3 BA1-D4 BA1-E1 BA1-E1 BA1-E1 BA1-E2 BA1-J1 BA1-J2 BA1-J3 GS.AL GS.AL GS.AL GS.AL gsal GS.AL GSAL GS.AL GS.AL GSAL gsal GS.AL GSAL 2.50 3.50 Note SS = Gra:n Sue D<stnbut:on GS.AL gs.al.c.d GS.AL.C.D gsal, c.d GS.AL GSAL. C n “ = Aterberg Lin* - ~ Mod.fed Compaction J ■ Density * £ “ Not Sampieo Nwan m association Nofconsutt International A 8 1W4/99I [ [ [ [ 2. Grain size Analysis Nineteen graphs, for the grain size distributions, have been drawn and attached here with. 3. Compaction tests The necessary graphs, for the compaction test results are also attached here with. Tested by:- Multi & Emcbct Date:- 20/10/98 Checked by:- Girma Mekonen Date:- £8 bo lib C.checkcd by:- Date:- Approved by:-_ Date:- i10036 Tel. 650613 - 166617-650800 FAX(25l-l) 650153 - 650617 Your Ref. AQG/223 - BDE Date Sept. 30,1998 Baro River Hydropower Prcfcasibility Study AQUATECH (Ab) Pvt. Ltd. Baro-1 Vnrious soil tests 19 soil samples submitted by the Client TEST RESULTS L Attcrberg limits and Modified compaction Modified compaction Serial N° Test pit N° Depth (m) Liquid limit (%) Plastic limit (%) Plasticity index (%) Max. dry density (kg/m ) 5 Optimum moisture content (%) 1 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 17 18 19 BAI-Al EA1-A1 BA1-B1 BAI.Bl BA1-C1 3A1-C2 BA1-C3 BA1-CU BA1-C5 BA’ -DI BA1--D2 BA1J22 BAI -JI BAI-JI 3A1-J2 BA1-J2 BAT-J3 BA1-J3 3.50 6.50 1.80 5.00 2.00 6.00 3.00 2.50 0.80 3.00 4.50 3.00 6.00 2.50 3.50 2.50 3.50 2.50 3.50 45.50 36.00 ♦ • 54.00 37.00 42.85 ♦ 4 61.00 56.00 58.62 44.00 47.00 55.60 39.25 40.20 69.90 60.10 32.81 31.92 ♦ ♦ 39.05 24.21 32.51 * * 46.40 36.31 41.72 31.97 31.58 29.18 26.06 20.59 37.15 32.50 12.69 4.08 ♦ ♦ 14.95 12.79 10.34 » * 14.60 19.69 16.90 12.03 15.42 26.42 13.19 19.61 32.75 27.60 • 1590 1910 1920 - 1800 18.00 13.20 13.60 - 13.80 Note:- 1.* = Non Plastic soil samples. 2. For other information regarding each sample, please refer to a photo copy of client's information attached herewith.EK7£RF.rJE •yT5W«M5«l5' itK6' : M ATEfil AlTYE^TTKOP5®^^ T -, ‘5‘06U48'ft' FAX-US1-I)MO1S3 GRAIN SIZE DISTRIBUTION r soli dtscription vliu»l soil clB»jific«tion ML -sandy silt___________ $y tem silty sand with X AS ^87 tested BY ________ ,------------ datEi- ?o/iozan CHECKED BY;* -Lj . Sjntayehu & Getachew^. CHECKED BY;. DATE t-. APPROVED BYi- DATE:-I. BARO-1 SOIL SAMPLES PROFILE AREA TEST PIT DESIGNATION SOIL SAMPLE (SERIAL) NO DEPTH TO SAMPLE (M) REQUIRED LAB TEST A-A BA 1-Al 1 3.50 GS, AL A-A BAI-Al 2 6.50 GS, AL B-B BAI-Bl 3 5.00 GS. AL B-B BA1-B2 4 6.00 GS, AL C-C BA1-C1 5 2.00 GS.AL C-C BA1-CI 6 6.00 GS, AL C-C BA1-C2 7 3.00 GS.AL C-C BA1-C3 8 2.50 GS.AL C-C BA1-C4 9 0.80 GS.AL C-C BA1-C5 10 3.00 GS.AL D-D BA1-D1 11 4.50 GS.AL D-D BA1-D2 12 3.00 GS, AL D-D BA1-D3 13 6,00 GS.AL AREEA-J BAl-Jl 14 2.50 GS, AL AREEA-J BA1-J1 15 3.50 GS. AL, C, D AREEA-J BA1-J2 16 2.50 GS, AL. C, D AREEA-J BA1-J2 17 3.50 GS.AL, C.D AREEA-J BA1-J3 18 2.50 3S, AL AREEA-J BAI-J3 19 3.50 ( 3S. AL. C, D NOTE: GS = Grain Size Distribution AL « Atterberg Limits C « Modified Compaction D Density aOfSIGN EHTfRPKBf F AX^C251-1)MO1$3 CLIENT PROJECT LOCATION BH/TPN* DEPTH GRAIN SIZE DISTRIBUTION .. AQUATECH (Ab) Pvt. Ltd. j. Haro River Hydropower Prefeasibility Study .- Baro-T .. BA1-E1 ; 1.bob SR No. 3 uriift (Jismrfir, mhi Visual toll description''hite S^ey silty sand with little clay Soil clitsif ication ML-sandy silt CHECKED System A STM D2<»87 reTe°off 7--Tg/Jo/98- ^t.ohew^c. CHECKED W, t *FEH0VtO BY?. DATE:CLIENT PROJECT ;■ LOCATION AiUATECH (Ab) Pvt. Ltd. 3aro River Hydropower Prefeasibility Study 3aro--j BH/TPN* :• BA1-A1 DEPTH ••• O.pOm SR No. 2 Vltual soil description S oil clatslf leaf ion Grain diame.rer. White grey silty sar.d with little clay. ML-sandy silt.___________ System _____ fl S TM D24SZ------------------------ TESTED BY .Sintayehy & Getachev^c. CHECKED BY:-. DATE2O/X)/9fe DATE CHECKED BY?—APPROVED BT:-. DATE:-VatWials fEfr^G oeiWJiw FAX.U$1-|>MO!5J GRAIN SIZE DISTRIBUTION CLIENT :♦ PROJECT LOCATION .- BH/TPN* :- DEPTH :- AQUATECH (Ab) Pvt. Ltd Baro River Hydropower Prefeasibility Study Baro-1 BA1-C1 2.00m SR No 5 Vliutl soil description—,,gE£.d sandy sil,T .,.Mlth_saBa..£j.ay______________________________ L— 1 Soil clitsificirion MHrsan.dV Glastii ASTM D2487 TESTED BY .-j DATE.-_ CHECKED BYt- uetachew^c. CHECKED BY,. DATE:-, APPROVEO BY- 0ATC:- If//?/??Percent finer ®^^toThG'1Qt^GN EKTtRPRISE H*miAL$ TESTthG OHWhTKY F AX-(Z5I-1)65O153 GRAIN SIZE DISTRIBUTION CLIENT ;.AQUAfECH (Ab) Pvt. Ltd PROJECT r- Baro diver Hvdrooower Prefeasibility Study LOCATION .-Baro-'l RH/TP N* DEPTH .. BM-B1 5.00m SR No. visual *hite grey silt sand wixh little clay, sod description--------------------------- - ------------—----------—----------------------------------------- - S oil Classi*ication ML-sandy silt ASTM D2^87 TESTED BY C. CHECKED BY;-„ date DATE^ZStgZI? CHECKED BY: APPROVED BY; DATE: 2CLIENT ;• AQUA TECH (Ab) Pvt. Ltd. PROJECT i- Bare River Hydropower Prefeasibility Study 4U1,.A . Visual soil ^ascription—san£ wlth' soro? cla*- > oil cl a isi tic a l ion ML-sandy silt TESTED BY .- DATEr- CHECKED BY; System ASTW D2487 CHECKED BY:- ------------- DATE APPROVED 8Y:------------- .AQ„ OATE:* 'ZfZ/t'/ffOlhG OesiQW ENTERPRISE B 4UJSir F AX-(2$1-t)6SO153 SRAIN SIZE DISTRIBUTION PROJECT *3UaTLCH (Ab) Pvt. Ltd LOCATION •- BaJ° ^lver Hydropower Prefeasibility Study BH/TPN* BA1-C1 - ----------------------------- ■ Whitg irey SUty gand wl-th Clay Soil classification ML-sandy silt A6TM D2^87 TESTED BY - Sintayehu & Getachew$lc. DATE- 20//iUyMa CHCCkE0 By,;_ CHECKED BYy DATE :- APPROVED BY DATEO^NG^OESIGH ENTERPRISE MATERIAL* TESTtkG OgPAftfMgMT igTsWttragzu scmit-tzum- tuitr FAX -I251-1J6SO153 CLIENT PROJECT LOCATION :• BH/TPR* OEPTH •■■ GRAIN SIZE DISTRIBUTION AQUATECH (Ab) Pvt. Ltd Baro River Hydropower Prefeasibilty Study Baro-1 BA1-CU 0.80m SR No 9 [ [ [ [ Visual soil description Sand with little 5.nr. [ [ > oil clftssif itfct icn ML-sandy silt System ASTM D2A87 WTt0 0 ?I “chew«K- CHECKED BYr- ------------- ISfcrfcg e t APPROVED BY-________ DATE:-Pl. D!hG QCSIGK EHTtRPPfSC y PAI-(251-n$50'53 GRAIN SIZE DISTRIBUTION CLIENT AQUATECH (Ab) Pvt. Ltd. PROJECT :• Ba.ro -liver Hydrooower Prefeasibility Study LOCATION : - Baro-1 BH/TPN* :• BA1-C3 Visual soil description-------------------- 2—£------------£------------------------ CJ-ay_ , White grey silty sand with little clav S oil classification ML-sandy silt A5TM D2A87 — System----------------------------. TESTED or - ^intayehu & Getachew^ DATE.-. 20/10^96 OATE CHECKED BYv- , -------- - APPROVED BY:- DATE-,-client AQUATECH (Ab) Pvt. Ltd [ PROJECT Baro River Hydropower Prefeasibility Study LOCATION Bar 0-1 BH/TP N* BA1-D1 L [ DEPTH 4.50m SR No.11 [ [ L L [ [ [ visual soil description Soil classificarion MH~elastic silt silt with little^ sand Sysfam ASTM 021*87 TESTED BY . - ..gintayehu & Getachev$V . DATE=< CHECKED BY:- -^n/@7&a_ *---------.. c CHECKED BY:-______________________ date =-_□ APPROVED BY-.-____ DATE:-MM PtNG DESIGN EMTERHkfSE PAX-(2St'1)65OI53 GRAIN SIZE DISTRIBUTION CLIENT PROJECT LOCATION BH/TP N* DEPTH AOUATECH (Ab) Fvt. Ltd Baro niver Hydropower Pre feasibility bcudy Baro*1 BA7-C5 3.00m SR No Gravel Sand Coarse to medium Fine Silt Clay U S. t tandord ale vs sizes Light Viiuil soil description---------------------------- S oil classification MH-elasric silt ---------------------------------------. System Gram ciamefer.mm red clayey silt with little sand AS TH D2487 TESTED BY . - Sj-nya & Jetache^c- CHECKED BY:- DATE:- 20/1 OATE CHt’CKEO BY--------------- __ APPROVED BY:- DATE:lUILDtNG DC SIGN eMTIRPRISf maVERIAlS TBTM OgHMtfENY FAX -(<$1-1)650153 GRAIN SIZE DISTRIBUTION CLIENT ;• AQUATECH (Ab) Pvt. Ltd. PROJECT Baro River Hydropower Prefeasibility Study LOCATION Baro-1 BH/TP N* .. BA1-D2 DEPTH 6. OOia SR. Ko. 15 Vliual soil dascripticn--------------- Llght S y silty sand with little clay re Soil clitiification ML-sandy silt ------------ - -------------------- —System AS™ 02467 TESTED BY SintaVehu & Getachew/H^ DATE >~2o7'l 0/9# ~ CHECKED Ry- * aqtm C - CHECKED BY:* DATE t- APPROVED BY-.- DATE.-Percent finer OiNG OESlGk rKTERMtS£ HPRBB' teeing <5^X?WVY vnwP4MW-i<«w-t«aHU'szr F AX-125M)65O1S3 CLIENT PROJECT LOCATION BK/TP K* DEPTH 6 revel :• GRAIN SIZE DISTRIBUTION • w AQUATECH (Ab) Pvt. Ltd. Baro River Hydropower Prefeasibility Study Barban BA1-D2 3.00m SR No T Send S. standard sieve sizes visual soil description Soil class if ica fieri MH-elastic silt TESTED BY . - _ CATC CHECKEO BY- urem diameter, mm clayey silt with little sand ASTfrl D2L87 — System------------------------------ j— Sintayehu & Getachev/i‘r • CHECKED BY:- DATE >. APPROVED BY- DATE:-Percent finer DING DESIGN ENTfRPkiSE F AX -{ZS1-1JSS0153 J&RAIN SIZE DISTRIBUTION Visual soil description Soil classification CH-Fat clay re< ^ silty clay wj-gh soaae sand System _ASIM IX?Z<87 TESTED By . - Sifttayehu & Gera chew ZB date i-~Pn/<57^R CHECKED BYv----------^->4. . C. CHECKED BY:- DATE t- APPROVED BY-.- DATE:A ding design enterprise .1 FAK-U5VUG5O153 -&RA1N SIZE DISTRIBUTION u QUA^H <Ab> pvt. Ltd. LOCATION - 3ar° Hiver Hydropower Prefeasibility Study 1U«1 coil description--------------- Lxght red_silty sgnd with sot»f> clay oil deceit icetian !<-sandy silt__________ syi+em_____ A5TM £>2^37 TESTED BY .Sintafrehu & Ge DAYE- ^UQ-j/W CHECKED BYy---------- tachew^- c • CHECKEO BY DATE APPROVED BY date--------------------- CLIENT PROJECT i- LOCATION :• PH/TPN* :• DEPTH AQUATECH (Ab) Pvt. Ltd. Baro *iver Hydropower Prefeasibiliry Study Baro-1 BA1-J2 3.50m SS No. 17 n Grave) Sand -J . Coarst to medium Flue sut Clay U S-s tandord sieve cites a oo< rv. m i s S •— rw Grain diameter, mm visual soil description-------------- Light red clayey silt with_snsp Soil classification CL-sandy lean clay ---------------------------- — System ASIN D248? CHECKED ByT— HZ3ZL CHECKED BY: DATE APPROVED BY DATEHATtkrDaiIKnGE3SSST10iNNEGMT OtRPEIUNSEAtMEkY FAJ-(15M)MO153 GRAIN SIZE DISTRIBUTION CLIENT :-A3UATECH (Ab) Pvt. Ltd. PROJECT baro •'■iver Hydropower Prefeasibility Study LOCATION , - Baro-1 RW/TPN* ..BA1-J2 DEPTH 2.50m SR No. 16 S oil clastif icetion KL-sandy silt tested err - — Syitem ---------------------------- —------------------- ----- ASTM 32^87 ■>int«yehu 8. Gecache^ CHt(:|(ED DATE.- CHECKED BY DATE APPROVEO BY. DATE:- *CLIENT AQUATECH (Ab) Pvt. Ltd. PROJECT :• 3aro River Hydropower Prefeasioility Study LOCATION Baro-1 BH/TPN* BR1-J3 DEPTH :• 3.50m SR No. 19 Gravel Sand Coarse to medium Fin* ■■■ Silt ——■ — ■ ■ US.standard slave sizes Grain diemer^r _____ visual soil rf<grripfiAn— Light, trey silty sand vith Soil classification ia-aanay.el.szu tested by DATE.- CHECKED BY & Getachew^\. checked BY,. OATe’>ZS APPROVED BY.. OATE.---^;^/^OING OesiGK ENTERPRISE rESTIIOEPWHEkT FM-aS1-l)S501S3 CLIENT PROJECT LOCATION BH/TPN* DEPTH Gtavtl -GRAIN SIZE DISTRIBUTION PVt ‘ Ltd •' Baro 1 VGr Hydr°P°wer Prefeasibiliry Study 3A1-J3 Coarse to medium U S. standart siovt sixes Visual ..II red sandy sllt “4th s°«e clav Soil classification MH-elastlc silt with sand —--------------------------------— S y s t a m aSIM D2487 tested BY DATE^_ CHECKEO BYr- Sihtayehu & 7TW" Getachev^t. CHECKED BY,. OATE APPROVED BY-.- DATE:LABORATORY DIVISION PminH • Baro River Hydropower PrefessiDility Stuay Client AQUA TECH (Ab) Pvt. Ltd,----------------------------------------- ------------------ Location:- Baro-1----------------------------------------------------- -------------------------- COMPACTION TEST Description: Light red sandy silt .with SftA&.ffXfry Type of Compaction ModifiedDepth —2L- Natural Moisture content (%) 2 * TP No- AB1-J1 Maximum Dry Density (kg/m3 } Optimum Moi sure Content (%) 13*20 '6, — 2000 1800 g MOISTURE CONTENT (%) Tested byAbraham Date :■ '^/W/9*' Checked by;- Glrfca~°F Dale:- ’K/WZ-tt C. Checked by:-» Dc “' •-___ Approved by:- Date >_______ <2 &*7<?_3 ILABORATORY DIVISION ProjectBare River Hydropowr Prefe.ssibility Study Client AQUATECH (Ab) Pvt. Ltd- Location:* Baro-1 COMPACTION TEST Description : ^Light red silty clay with some sand TP No AB1-J1 Type of Compaction ?tOQX1 xeQ Natural Moisture content (%) 6.67 p nt>T~37snm ' e ——. Maximum Dry Density (kg/m3LJ^0Optimum Moisurc Content (%) 1B.00 Specific Gravity _____________________ ’ ------------ Remark________ SR No15 "" “-------------- 600 550 50 50 00 Testa) by .Abrah : a» Dale ; C. Checked by:- Checked by:- ? =-_icELs’g' atc Da,c __________ V«/ .19Z9B Approved by:- w Dalt >—zghz^ DRY DENSITY (Kg/m3)I V LABORATORY DIVISION Pmiwt ■ Baro River Hydropower Prefessibility Study CliS > Pvt. Ltd. Localion:- Baro - 1 —--------------------------------------------- -------------------- — COMPACTION TEST Description : right, grpy silty gan.d with cnrig Clay------------------------------- ----------------------- J TP Mo. AB1-J3 Type of Compaction ModifiedDepth—P?.„---------------------------------------------------- Natural Moisture conlent (%) Maximum Dry Density (kg/ru3 ) 1600 Optimum Moisure Content (%) l^-ou._ Specific Gravity Remark No 19 : ---------------------------------------------------- .. t-s-a—laboratory division Project Client _ Location:- Baro-1 -------------------------------------------------------------------- COMPACTION TEST Description: Li&ht red’ clayey IVDP nf CnmrantizxM MCitl 1 it o/T_ " Type of Compaction Mod i f i ed Natural Moisture content (%) * • Remark SR No 17 6 u t with soae gand ** TP No. AB1-J2 Depth 3.50m O*™-. Moisure Content (%) - ----------------------------- —----------- Tested by > Date :• I C hccked by:-Girma MeXcr.nen Date:- 14/10/98 C. Checked by:- . Cx p{~ Dalc _____ 2_<S 17*7^ Approved by;- Date >—jfe ~P.O.Box 40036 TeL 650613 - 166617-650800 FAX(251-1) 650153 - 650617 Project Title Client Locution Test Object Ref. N*AQG/223-BDE Date Sept. 30, 1998 Baro River Hydropower Prefeasibiiity Study AQUATECH (Ab) Pvt. Ltd. Baro- 2 Various soil tests 15 Soil samples submitted by the Client TEST RESULTS !• Atterbcrg limits and Modified Compaction Modified compaction Serial N* Test pit N° Depth (m) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BA2-A1 BA2-A1 BA2-A2 .BA2-B2 B42-C1 BA2-C2 BA2-D1 BA2-P1 BA2-P1 BA2-P2 BA2-P3 BA2--P4 BA2-G1 BA2-G2 BA2-C3 2.50 5.50 1.50 0.60 1.10 1.80 1.00 1.40 0.70 0.80 1.00 2.00 2.50 4.50 1.50 Liquid Limit (%) 60.40 37.50 53.60 * 46.50 52.50 69.00 53.20 * * 22.60 54.75 55.50 41.60 54.70 Plastic Limit (%) 3533 19.41 25.30 * “26.31 25.44 34.92 30.52 ♦ * 16.42 29.94 32.59 26.27 30.94 Plasticity Index (%) Max.dry Density (Kg'm ) 3 Optimum Moisture Content 25.07 18.09 28.30 * 20.19 27.06 34.08 22.68 * » 6.18 24.81, 22.91 15.33. 23.76 ---- * ' 1625 1897 1627 19.00 12.80 24,50 Non Plastic soU samples. 2. For other informatii copy of client’s inr r ,n forO mmation attached herewith. n rJardiUg each SamPlc’ P'<^ refer to 1/2IL BARO-2 SOIL SAMPLES PROFILE OR AREA TEST PIT DESIGNATION SOIL SAMPLE (SERIAL) NO depth to i SAMPLE (M) required lab TEST A-A BA2-A1 1 2.50 GS, AL A-A BA2-A1 2 5.50 GS. AL A-A BA2-A2 3 1.50 GS. AL B-B BA2-B2 4 0.60 GS. AL C-C BA2-C1 5 1.10 GS. AL C-C BA2-C2 6 1.80 GS. AL D-D BA2-D1 7 1.00 GS.AL F-F BA2-F1 8 1.40 GS. AL P-P BA2-P1 9 0.70 GS, AL P-P B.A2-P2 10 0.80 GS, AL P-P BA2-P3 11 1.00 GS, AL P-P BA2-P4 12 2.00 GSt AL, C, D AREEA-G BA2-G1 13 2.50 GS, AL. C, D AREEA-G BA2-G1 14 4.50 GS, AL, C, D AREEA-G BA2-G2 15 1.50 GS. AL, C. D NOTE: GS - Grain Size Distribution AL = Atterbcrg Limits C ~ Modified Compaction D « DensityCLIENT ;• AQUATECH (Ab)Pvt. Ltd. • PROJECT Baro rtiver Hydropower prfeasi bility Study LOCATION ; - Baro-*2 8H/TPW :• AB2-A1 DEPTH :• 2.50m SH No 1 VI,»fl d.terlption White grey silty saiid wi*h litUe clay TESTED BY : - DATE:* CHECKED BY> ASTM P2^B7 C • CHECKED BY, S. DATE APPROVED BY.. DATE:* *2/0^ ;2. Grain Size Analysis Fifteen graphs, for the grain size distributions, have been drawn and attached herewith. 3. Compaction test I'he necessary graphs for the compaction test results are also attached herewith. Tested by Emebct and Anely C.chccked *4 Date Checked by:- 20/10/98 Girma Mekonncn Date 1KB * Approved by Date Date 2 /2EHTCRPIUSE F AX-:Z51-1)S5O153 GRAIN SIZE DISTRIBUTION CLIENT PROJECT LOCATION BH/TPN* DEPTH . AQUATECH (Ab) Pvt. Ltd. . Baro Biver Hydropower Prefeasibility oxudy _ Baro-2 - AB2-A2 1.50m Visual toil descriptton sandy clay, with soy ^il't Soil classification MH-sandv. elastic silASIM D2A87__________________________________________________ CHECKED BY-— APPROVED BY-- D AT c • * 2$/^/$ gCLIENT AQUATECH (Ab) Pvt. Ltd. PROJECT 3aro Hiver Hydropower LOCATION Baro-2 BH/TPN* AR2-A1 DEPTH ;• 5.50m Prefeasibility Study 2 Drivel Sand Coer st to medium Fine Silt U S. standard xitve sizes Gi ein diameter, ram VilUll ..n -......................-Whlte Uttl, clay Soil clarification .-Sandy lean clay TESTED BY DATE-. CHECKED BY> —Syafam ASTM D2487 ^intayehu & Getachew/Vfi T G*4 C- CHECKED BY;- DATE >. 2_ APPROVEO BY; DATE0ES16H fWTCRHHSE FAX-(253-1>«(M53 GRAIN SIZE DISTRIBUTION CLIENT PROJECT LOCATION AQUATECH (Ab) Pvt. Ltd Baro River Hydropower Prefeasibillty Baro-2 c tllHv Study Soil Classification CL-lean a.y with A5TO Da„a7 : .^tayehu & Getach^w/nL- TESTED BY , . ________ DAET.E-S;-/212OO/W/1-Q--/-Q--a--.--------- &TC- CHECKED BY . CHECKED »v- - DATE : APPROVED BY: DATE(lvxi □The oesiON enterprise FAX-tZSI-DMO’SS GRAIN SIZE DISTRIBUTION CLIENT AQUA TECH (Ab) Pvt. Ltd. PROJECT :• Baro River Hydropower Prefeasibility Study LOCATION Baro-2 BH/TPN* AB2-B? DEPTH .,0.50m 5ft No. U Grey sand with some silt Visual foil description —----------------------------------------------------------- Soil claasificetion ML -sandy silt System -------------- ASTM D2487 TESTED ST . - Sintayehu G date-.- pnAyypa-. CHECKED SY.- --------O.VS.J HcK? DING DESIGN ENTERPRISE WMAl* TESTfWtS OEPXftfHEKT vnwTOBrnTgcm F Al-(2S1-1)MO153 GRAIN SIZE DISTRIBUTION CLIENT PROJECT LOCATION BH7TPN* DEPTH ..AQUATECH (AB) Pvt. Ltd. Baro lUVer Hydrdpower Prefeasibility Study .. Baro<-2 AB2-D1 •• 1 .OOm Gravel Sand Coarse to medium Fine Silt Clay •4 < U S.e tandart sit ve sizes Ooc — 8S — f> Ex2a O X2 Gt Rin diameter, mm - Vl»u«l moil (inscription—clay with little Soil clBisific*tion MH-elastic silt Syctam ASTM D2A87 TESTEDI BY .^intayehu & Getachsw3l, OATEi.ZSnT^Tg— neVfe«C. CHECKED BY CHECKED BY- C-rTT ~ DATE2_ APPROVED BYi. DATE:-furxi OtHG DESIGN ENTERPRISE F AX - (25I-DG5O153 CLIENT PROJECT LOCATION ;- BH/TPN* i- DEPTH •- GRAIN SIZE DISTRIBUTION AQUATECH (Ab) Pvt. Ltd. Baro £iver Hydropower Prefeasibility Study AB2-C2 1.80« SR No. V c V u «l a. 'i«u»l toil description $ oil claotif icetion CH-Fat clay with sand Red sandy clay with sone silt --------------------- ------ —---- 1 y item ASIN D2487 TESTED BY . -Sintayehu & Ge tachew/3l c OAT E 20/1OZ^a w • CHECKEO BY-. DATE CHECKED BYr- -W APPROVED BY-.- DATE:GRAIN SIZE DISTRIBUTION CLIENT A2UATECH (Ab) Pvt. Ltd. PROJECT 3aro River Hydropower Prefeaaibility Study LOCATION .3aro-2 ; VIlUll Mil d^rrip + l-.-Grey A nri .yi a th 1<+t1a J, 1 + Sail cltssifIcatian NL-Sandy silt ----------- ~--------- -—-S y a tern ASTH D2487 |T. CHECKED BY,. CHECKED BYr^-— DATE 0. APPROVED BY,. DATE,.Percent finer dikg design ENTERPRISE FAX~(15M)ttO153 5RAIN SIZE DISTRIBUTION CU6NT AQUATECH (Ab) Pvt* Ltd PROJECT :- Haro Ryver Hydropower Prefeasibility Study LOCATION -Baro-2 BH/TPN* AB2-F1 DEPTH Vlml ..II ........................ r..- Red 5aid>' Clay “lth “tt'le silt soil classification MH-sandy elastic silt -------------------------------------Systtri --------- ASTM D2487 TESTED BY - ^intayehu & GetaChew^Jc. CHECKEO C1 CHECKED BY DATE;-. i-10/98 approved by DATEGRAIN SIZE DISTRIBUTION CLIENT AQUATECH (Ab) Pvt. Ltd. PROJECT 3aro River Hydropower Frefeasibility Study LOCATION 3aro-2 Visual soil description Soil classification MH-»»nay elastic ,1^ checked ASTM CH « E EO >y Z krekdved^::^?25^ DATE:.CLIENT ;• AQUATECH (Ab) Pvt. Ltd. PROJECT Baro River Hydropower Prefeasibility. Study LOCATION Baro-2 BH/TPN’ AB2-P2 DEPTH °-bOm 6i< No. 10 Soil clKsificatian ML-sandy silt AS TT-i D2L87 • System —------------------------- — TESTEO BY ;■ -Bintayehu & uetachew/3l c DATE^_ fC. CHECKED BY- DATE: CHECKED BYj- APPROVED BY: DATEMtf.1 OIKS OeSIOK EHTERPSISE MAT'CRIALi rEmWDCH&fP.EkY B~nMw-tMffs-umiJ-uszK-mu{ FAX.(151-1)C5O153 1 I GRAIN SIZE DISTRIBUTION CLIENT PROJECT LOCATION BW/TPN' DEPTH : . AQUATECH (Ab) Pvt. Ltd. i- Baro W.ver Hydropower Prefeasibility Study ; . Jaro-2 .. AB2-G1 ;2.50n ( Vlfu«l nil description—Bed Bll.tZ-Qlay with stag and S S oil classification MH-elastic silt with ASTW D24B7 TESTED BY . - • * PATE:. ie ^ehow^c.’ CHECKED BY,. date JjVfc? n CHECKEO BY>-■— QJXZ * V 'k ■ APPROVED BYi-. "* date.-fL«£.T DING DtSlGK ErrtftpttsE FAX-(I5M)GIO153 SRAIN size distribution PROJECT :-laroTkCH tvt> Ltd- location --Baro-2 er hydr<>Power Prefeasibility Study BH/TPH* AB2-PZ; visual <»il description —^ed sand Soil Classification CH-Fat Clay with sand^,^ CHECKED BY-- i; '"«KED BY:. ^^‘"7. DATE;. ‘Zg/V?#I tMF&MK MTMMISE MATERIAL TEiTlkfilJWWm' GRAIN size distribution Viitrt! xoH description Soil cliffiticetion CH-Fat clay with sand —----------------------------------- System □rain duratrer, mm ilty clay with some AS TO D2487 TESTED BY - Sinrflyehu & Getachev/lk DATE:-.. 20/10/98 CHECKED BY> . CHECKED BY:- OATE ;-_2. APPROVED BY:- DATE:-I BAIN SIZE aiSTRlBUTION riiENT - A3UATECH (Ab) rvt. Ltd. ptijECT - 3aro Hiver Hydropower Fre'eaS ility study LOCATION 3arO"2 BH/TPN- depth Grave I Coarse to medium u S.ftindort «i«v« iftM OQ Gt a in diameter, mm Grey silty sand with some'clay * Visual soil description—---------------------------- --------------------------------------- S ail classification CL-sandy leanclay _______ _------------------------- System TESTED BY -J DATE;-_ CHECKED BY- A AS TH D2487LABORATORY DIVISION ProjectBaro River Hydropower Prefeasibllity Study Client AQUATECH (Ab) Pvt, LtcE------------------------------------------------------------------------------ Location:- Baro-2 . „_______________________________________________________ ____________ COMPACTION TEST Description : Grey silty sand with sn!M>-£l2y------------------------------------------------------------------------ Type of Compaction ModifiedDepthA • _________________ Natural Moisture content (%) 3.55 Maximum Dry Density (kg/m3 ) 1897 Optimum Moisure Content (%) 12,80 Specific Gravity_____________ ._ RemarkSR No 111 ______________________________ 1 cr sc 1800> 17000 MOISTURE CONTENT (%) Tested by Abrahani&Girma Dale , U/10/98" q "" Checked by> ] Date C. Checked by> .fit Datc Approved by:-^ ~ Datc >-------- szj?//*/'??LABORATORY' DIVISION Projectbaro Hiver Hydropower Prefeasibility Study Client Location:- A^UATSCH (Ab) PVT. Ltd. 3a rQ -2 ■ COMPACTION TEST Description: Red Silty clay with some sand TP N2. AB2-G1 Type of Compaction Modified Natural Moisture content (%) 8 qq—————— Depth 2.50m Maximum Dry Density (kg/m3 ) 1625Optimum Moisure Content (%) 19. OC Specific Gravity _______________________ Remark SR No 13 Tested by Abraham Date 1*710/98 Checked by:- Date C. Checked by:- Da,c » Approved by:- Zerf D » Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 C - Annex 4 F Page i THE FEDERAL DEMOCRATIC REPUBLIC OF ETHIOPIA MINISTRY OF WATER RESOURCES BARO 1 & 2 MULTIPURPOSE PROJECTS FEASIBILITY STUDY Final Report Annex 4 F Report from Geological Mapping By Moila and Mengesha September 2006 Frontpage Annex 4 F (2).doc NORPLAN - NORCONSULT - LAHMEYER JV in association with Shebelle Engineering and WWDSELABORATORY’ DIVISION ProjeciBaro River Hydropower Prefeasibility Study C,icnt AQUA TECH (Ab) Pvt, Ltd.___________________________________ Location:- 3a.ro-2_________________ f COMPACTION TEST Description :Grey si Try clay with sand TP N& AB2-G2_______________________________ Type of Compaction ModifiedDepth 1. j>Om_________________________________ Natural Moisture content (%) 3*36 __________________________________ Maximum Dry Density (kg/m3 ) 1627 Optimum Moisure Content (%) Specific Gravity___________________________________________________ Remark SR No *5 rested by ;-Abraham_& Girna C. Checked by Date2 Dale Approved by:-_ Checked by:----------— DateFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 C ■ Annex 4 F Page ii NOTE Geological maps and section drawings in the Final report have been modified by the Con sultant following the Clients comments on the Draft Feasibility Report. In the draft report these drawings showed terrain lineaments caused by various geomorphologic processes. Based on aerial photograph analyses and engineering geological interpretation by the NOR PLAN geologist, the lineaments have been replaced by inferred weakness zones, shown on the geological maps and section drawings in the final report. These inferred weakness zones may effect the planned constructions and do not include all the lineaments shown in the draft report. Detailed information on lineaments is shown in Table 6-3, Table 6-4, Table 7-2, Table 7-3 and Table 8-2 of the draft report. These tables have not been changed in the Final report. Frontpage Annex 4 F (2).doc NORPLAN - NORCONSULT - LAHMEYER JV m association with Sheballe Engineering and WWDSEFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Bare 1 & 2 Multipurpose Project 7.3 Present Geological Studies of the Baro2 Hydropower Project Area7-3 7.3.1 Geology of the Baro2 Tunnel Alignment7-3 Volume 4 - Annex 4 F Page iv 7.3.2 Geology of Baro2 Dam Site7-11 7.3.3 Construction Materials............................................................................................................................................7-14 7.3.4 Engineering Geological Considerations7-15 7.3.5 Conclusion and Recommendation7-17 8 GENJI 8.1 General 8.1.1 Background 8.1.2 HYDROPOWER PROJECT 8-4 Location and Access 8.2 8.3 Previous Studies 8.2.1 Geological Studies........................................................................... 8.2.2 Pre-Feasibility Study Present Geological Study of the Genji Hydropower Project 8.3.1 Geology of the Genji Tunnel Alignment 8.3.2 Geology of the Genji Dam Site 8-1 8-1 .8-1 8-1 .8-1 .8-2 .8-2 .8-6 .8-7 .8-7 8-9 8-2 8.3.3 Construction 8.3.4 8.3.5 Engineering Geological Material Considerations Conclusion and Recommendation 9 REFERENCES, Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page in AND GENJI HYDROPOWER PROJECTS GEOLOGICAL MAPPING OF BAR01, BAR02 TABLE OF CONTENT TABLE OF CONTENT LIST OF FIGURES. LIST OF TABLES LIST OF ANNEXES 1 INTRODUCTION 1.1 1.2 Background Scope and Objective of the Study... 1.2.1 General 1.2.2 Scales and Extensions of Maps 1.3 Location and Accessibility 2 APPROACH AND METHODOLOGY OF WORK. 3 FIELDWORK 4 LABORATORY ANALYSIS. 5 REGIONAL GEOLOGY AND TECTONICS 6 BAR01 HYDROPOWER PROJECT 6.1 6.2 6.3 General 6.1.1 Background 6.1.2 Location and Access Previous Studies 6.2.1 Geological Studies 6.2.2 Pre-Feasibility Study for Hydropower Present Geological Studies of the Barol Hydropower Project 6.3.1 Geology of the Barol Tunnel Alignment 6.3.2 Geology of Barol Dam Site 6.3.3 Construction Materials 6.3.4 Engineering Geological Considerations 7 BARO2 HYDROPOWER PROJECT 7.1 General 7.1.1 Background 7.1.2 Location and Access 7.2 Previous Studies 7.2.1 Geological Studies 7.2.2 Pre-Feasibility Studies for Hydropower n IV IV IV 1-1 1-1 1-1 .1-1 .1-1 1-2 2-1 3-1 4-1 5-1 6-1 6-1 .6-1 .6-1 6-1 .6-1 ..6-2 .6-2 ..6-3 ..6-7 ...6-9 .6-10 7-1 7-1 .7-1 .7-1 7-1 .7-1 ..7-2 Molla Be>aynei7^dM^ge ha Teferra SFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page M 1 1.2 1.2.1 INTRODUCTION Background The Bard, Baro2 and Genji Hydropower Projects are part of the Baro-Karadobi Hydropower Project which has been identified for study and development under the Nile Basin Initiative and presently is under feasibility Study by NORPLAN-Norconsult-Lahmeyer- Shebele Consultants with the Client being the Ministry of Water Resources. This report deals with the geological mapping of the Bard, Baro2 and Genji hydropower projects. Scope and Objective of the Study Genera/ The aim of the geological mapping is to obtain sufficient information about the ground conditions for the project optimization and coast assessment at the feasibility level. A general geologic map, covering the three dam sites providing general geological information, such as location and elevation for boundaries between the main geological formations and location/orientation of fault zones. Detailed geological mapping at the dam sites shall give information on ground conditions for project components, including assessment of: a) a, Soil cover above bed rock b) b, Location, orientation and condition of fractures, fracture zones and faults in the dam site area. c) c, Rock quality in regard to tunneling. d) d, Information on possible sources for rock materials for use as concrete aggregate as well as for rock fill dam materials. e) e, Information on possible sources of clay materials to be used in potential clay core in rock or earth-fill dams. f) f, Information on deposits of alluvial materials with potential of being used as concrete aggregate. Scales and Extensions of Maps A General Geological Map with general geological information, covering the tunnel alignment and areas in the order of 500m upstream of potential intake, 500m downstream of potential outlet and 500m to both sides of the alignment. Scale 1:10,000. Detailed Geological Map, with detailed geological information for each dam site: Scale 1: 2000. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page v LIST OF FIGURES FIGURE 1: FIELD GEOLOGICAL OBSERVATION POINTS, BAR01 FIGURE 2: FIELD GEOLOGICAL OBSERVATION POINTS, BAR02 AND GENJI FIGURE 3: REGIONAL GEOLOGICAL MAP OF THE PROJECT AREA LIST OF TABLES Table 2-1: Terminology for the Description of Rock Weathering and Alteration2-2 Table 6-1: List of Aerial Photographs Used for Barol6-3 Table 6-2: Summary of Thin Section Analysis on Rock samples from Barol6-4 Table 6-3: Lineaments Crossing the Barol Headrace Tunnel6-11 Table 6-4: Lineaments Crossing the Barol Tailrace Tunnel6-12 Table 7-1: List of Aerial Photographs Used for Baro27-3 Table 7.2: Summary of Thin Section Analysis on Rock Samples from Baro27-5 Table 7-2: Lineaments Crossing the Baro2 Headrace Tunnel7-16 Table 7-3: Lineaments Crossing the Baro2 Tailrace Tunnel Table 8-1 List of Aerial Photographs Used for Genji Table 8-2 Lineaments Crossing the Genji Headrace Tunnel LIST OF ANNEXES Annex Geology 1: Barol Geological Maps and Sections Annex Geology 2: Baro2 Geological Maps and Sections Annex Geology 3: Genji Geological Maps and Sections Annex Geology 4: Barol Structures Annex Geology 5: Baro2 Structures Annex Geology 6: Genji Structures Annex Geology 7: Petrographic Analysis Results Annex Geology 8: Photos q_2 8_g Annex Geology 9: Description of Field Observation Points, Barol, Baro2 and Genii Geolooical Mapping J y wa' M0"aFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 2-1 2 APPROACH AND METHODOLOGY OF WORK The approach and methodology of work was carefully selected to meet the terms of reference and to achieve the geological mapping in the given time frame. • Desk studies of existing previous geological data in the project area • Examination of the Existing topographic maps (1:50,000 scale, 1:250,000 Scale etc) prepared by the Ethiopian Mapping Authority (EMA) • Examination and application of the 1:10,000 and 1:2000 topographic maps as base maps for the geological mapping. • Selection of access routes and main traverses based on the desk studies. • Field work and field geological mapping assisted by the aerial photographic interpretation and topographic maps. • Use of basic geological tools like compass, geological hammer, hand lens etc. Use of Global Positioning System (hand held GPS) • Use of laboratory tests on selected rock samples. Finally analysis and compilation of data were made in the office that included: • Autocad assisted geological map production. • Stereonet presentation of joints and foliation using a computer software • Lineament analysis • Lithological grouping based on hand specimen description and petrography • Examination of test pit and bore hole logs. • Geolgical report preparation The report was first prepared in draft final and after comments by the client the final report was prepared. Molla Belayneh and Mengesha TeferraVolume 4 - Annex 4 F Page 1-2 about: Baro 1 Baro2 100 meter above river bed level 50 meter above river bed level 1.3 • Genji 40 m ab4o0vem nav<bove river bed level Location and Accessibility The three project areas are situated in Western Ethiopia, 300 Km (air distance) West of Addis Ababa in Oromiya Regional State, lllubabor zone. The Project Area can be reached by an all weather asphalt and gravel road from Addis Ababa. It is 618Km to Gore Town while Uka and Sibo towns from where Barol and Baro2 are accessed are located at 35Km and 53Km respectively from Gore Town. Two seasonal tracks, negotiable by 4-WD have been constructed to Barol and to Baro2 Dam Sites from Uka and Sibo respectively. In addition Ethiopian Airlines Lines serves Gore town about 60 km from the project area once weekly, and Gambela town which is about 110 Km further from the project area, four times weekly. The Barol, Baro2 and Genji Hydropower Project are located along about 30 Km long section of the Baro River between co-ordinates UTM (Zone 30) N890000 to N904000 and E7360 00 to E761000.Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 3-1 FIELDWORK The fieldwork was conducted in two periods over a total of about one month. The first fieldwork was done from April 12 to 28, 2005) in Baro2 and Genji Hydropower project areas. The second field work was conducted from May 28 to June 17, 2005 mainly in the Barol hydropower project area and partly in the Baro2 and Genji Hydropower project areas. The accommodation in the field was a tented camp. The areas are heavily forested with residual soil cover concealing the bedrock in all the three project areas, the condition being more severe at Bard. However all possible access useful for geological observation were used to observe the geology. Figures 1 and 2 show traverse routes, continuous observation areas as well as spot observation points. GPS reading was taken in UTM for location of traverses and identification of position of observation points. Joint, foliation and lineament orientation and dips were measured using Branton Compass. Several traverses were made along the Baro and Genji Rivers courses, where rock exposures are abundant and nearly continuous. The rock exposures here are also fresh providing a clearer observation for identifying and differentiating the rock types. Traverses were also made across the project area perpendicular to the river courses. Traverses were also made inside the tributaries where rock exposures were expected. However exposures are less fresh outside the river courses. Traverses were made by foot, since there was only limited access even by 4-wheel drive car. Lithological, Stratigraphic, relationships and structures were investigated, noted and recorded in field note books, topographic base maps (1:10,000 and 1:2,000 scale) and also verified with the aerial photographic (1: 10,000 and 1:50,000 to 40,000) interpretations. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4-Annex 4 F Page 2-2 Definitions The following terminology* shown in Table 2-1 has been applied for the description of rock weathering and alteration, and descrip residual soils. Table 2-1: Terminology for the Description of Rock Weathering and Alteration Term Description Fresh No visible sign of weathering. Rock fresh, crystals bright Few discontinuities may show slight staining. Slightly weathered Penetrative weathering developed on open discontinuity surfaces, but only slight weathering of rock material. Discontinuities are discolored and discoloration can extend into rock up to few millimeters from discontinuity surface. Moderately weathered Slight discoloration extends through greater part of rock mass. The rock is not friable. Discontinuities are stained and/or contain a filling comprising altered materials. Highly (severely) weathered Weathering extends throughout rock mass and the coloured material is partly friable. Rock has no luster. All material except quartz is discoloured. Rock can be excavated with Geologists pick. Completely weathered Rock is totally discoloured and decomposed and in a friable condition with only fragments of rock texture and structure preserved. The external appearance is that of a soil. Residual Soil ....................... Soil material with complete disintegration of texture, structure and mineralogy of parent rock. * Classification from the point of weathering recommended by the Geological Society of London (1970) and accepted by US Task Committee for Foundation Design Manual (1972)Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 5-1 5 REGIONAL GEOLOGY AND TECTONICS A brief summary of the regional geology and tectonics of the project area is presented here see Figure 3. The Ethiopian plateau is underlain at depth by Precambrian crystalline basement successions of the NE African-Arabian Shield covered in part by Paleozoic and Mesozoic sedimentary sequences and tertiary to quaternary volcanic rocks. The Main Ethiopian Rift valley and the Afar Depression of Ethiopia, divide the Plateau into the Northeastern and Southwestern Plateaux. The Precambrian Basement rocks of the Ethiopian Shield crop out in four areas, that is Northern, Western, Southern and Eastern parts of the country, near the plateau margins. The Western Ethiopia Shield where the project area is located is the largest of these exposures. The western Ethiopia shield is a mosaic of raised metamorphic gneissic domains separated by North-South trending belt of low grade metamorphic rocks that contain recognizable volcanic and sedimentary sequences, many of which are highly sheared and intruded by diverse suite of plutonic intrusions. In the Gore Map Sheet Mengesha and Seife (1987) recognized three major domains based on structural style, lithology, and metamorphic grade and referred to the Baro, Birbir and Geba Domains. The Baro and Geba Domains consist of gneisses and migmatites at upper amphibolite metamorphic grade, where as the Birbir domain that lies in between them is a complex lower metamorphic grade rocks containing abundant mafic schists. The three-hydropower projects are located in the Geba Domain. Early plutonic bodies that are lenticular are recognized and are internally foliated and concordant with their host rocks. There are also late more equi-dimensional and discordant intrusions. Further North, NW, South and SE of the project area the Precambrian basement terrain is directly overlain above 1,600m meter elevation by flat lying, fine grained, aphiric, Tertiary Basalt Flows that have a preserved thickness of at least 250 meters. There is no evidence of Mesozoic Sedimentary rock deposits between the basalts and the underlying Precambrian basement rocks. Thus the marine transgression and regression that led to the deposition of sedimentary rocks elsewhere (mainly in the North and East) of the country, presumably did not reach here or were eroded away. Thus e Tertiary basalt lava flows unconformably overlie the Precambrian rocks resting directly on them. j basalt, beanng large plagioclase phenocrysts occure^® vesJu,ar metpXlt scattered outlier on an erosion surface at about 1300 few tens T1'0?5, 'n?he valleys of Bar0 and GenJi Rivers- Only a are unknown T? thickness are Preserved and its correlations succession 'S presumably youn9er than ‘he plateau basalt Molla Belayneh and Mengesha Teferra© Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 4-1 4 LABORATORY ANALYSIS During the geological mapping representative rock samples were collected for further studies in the office and for laboratory tests. Thin section and petrographic studies were carried out at the Central Laboratory of the Geological Survey of Ethiopia. M °lla Be'^h^dM ngesha Teferra eFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-2 6.2.2 All of the previous geological studies were useful in that they provided an understanding of the regional geology and tectonics of the project area. Pre-Feasibility Study for Hydropower A Pre-feasibility Study for Hydropower Development was carried out by NORPLAN - Norconsult on Barol and Baro2 projects (1999). The following brief summary on the geology was extracted from this study. Soil Investigation At the pre-feasibility level a total of 19 test pits were dug along cleared profiles on alternative dam sites. Three test pits were dug to investigate potential borrow areas for construction material investigation. Samples (19) were taken from 13 test pits from various soil horizons and tested in the Building Design (Presently Construction Design Share Company) Laboratory. The tests included classification, plasticity index and compaction tests. Geological mapping During the pre-feasible study program, geological mapping of the Bard project area was carried out and a geological map of 1:50,000 scale of a reconnaissance nature has been prepared. According to this study the area is underlain by Precambrian basement rocks overlain by Tertiary basalt flows. The basement was described to be quartz, feldspar, biotite gneiss, hornblende schist, and syn-tectonic granite. The project area is reported to be dominantly underlain by crystalline basement rocks. The dam site and the power intake are reported to be located on the quartz feldspar-biotite gneiss. The headrace tunnel and the power house are reported to be located on the syn-tectonic granite and the tailrace tunnel is reported to be located on hornblende schist. The foliation of the rocks mentioned generally trends N-S and dips W. There are also shown NW-SE and N-S trending faults dipping 30°-50° SW and W respectively. The present geological mapping has made a lot of improvement to the pre-feasibility study geological map, including addition of detail and corrections where required as can be observed in the following sections. Present Geological Studies of the Barol Hydropower Project The current geological mapping includes general geology of the tunnel alignment at 1:10,000 Scale and detailed geological mapping of the dam site at a scale of 1:2,000. Lithology as well as structures were mapped. Where the overburden is thick and extensive this was shown including the bed rock from which it was derived. Molla Belayneh and Mengesha Teferra: ederal Democratic Republic of Ethiopia - Ministry of Water Resources feasibility Study of Baro 1 & 2 Multipurpose Project BAR01 HYDROPOWER PROJECT General Background Volume 4-Annex 4 F Page 6-1 The Barol and Baro2 cascade. Bard where 14 Km upstream of — Hydropower Projects are to be developed in > the main regulation dam is located is about . There had been conducted a pre- .x > feasibility study in 1998. The Scheme consists of dam, headrace tunnel, power house and tailrace tunnel including other appurtenant structures. Location and Access The Bard Hydropower project is located between coordinates UTM N 890000 to N894000 and E756000 to E 762000. It can be reached by dry season track that turns south from the main Addis Ababa - Gambela road near Uka Town which is about 670 km from Addis Ababa. 1 >j Previous Studies Geological Studies A review of the relevant previous geological studies close to or adjacent to the current hydropower project sites is presented in this section. The 1; 2,000,000 scale 1s’ edition Geological Map of Ethiopia (Kazmin, 1972a) and its explanatory Note (Kazmin, 1975) and the 2nd edition Geological map of Ethiopia (Mengesha et al, 1996) and its accompaning explanatory note provide a broad overview of the Geology of Ethiopia in general. The Gore map sheet (Nc 36 -16) was mapped at 1 : 250,000 scale by Mengesha and Seife (1987). GEOLOGICAL MAPPING OF BARO1, BARO2 De Wit (1977 ) provided a short account on the geology of part of the map sheet. Kazmin (1971,1972b, 1975 a and b) proposed the first startigraphic subdivisions and tectonic synthesis of the Precambrian rocks of Ethiopia. Kazmin et. al. (1978,1979) interpreted the geology of western Ethiopia in the light of plate tectonic considerations. More detailed maps of parts of western Ethiopia shield were published by the United Nations Development Project (1972) and the Omo River Project (Davidson, 1983). As part of the Integrated Maser Plan Study of the Baro - Akobo River Basin, 1: 250,000 scale geological map of the entire basin had been prepared (ARDCO-GEOSERV, 1994). A 1: 1,000,000 scale Geological map and an accompanying geological report of the whole of Oromiya Region was compiled by (Geodev- Afredis, 1999). Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F PagefM One is south of the powerhouse and the rest are south and north of the tailrace, both on the southern and northern sides of Baro river. These exposures form conspicuous ridges in the area. This gneisses are rather migmatitic, cut by numerous subconcordant lenses of granitic and migmatitic material. Discordant dykes and pods of pegmatite and granite are also common. The gneisses are dominantly slightly weathered, well foliated, medium grained, light gray, biotite and gray to dark gray homblende-biotitite gneisses. They are closely to moderately jointed. Biotitic and/or hornblende are dominant mafic minerals. The following is a summary of thin section and petrography analysis conducted on three samples (BA1-1, BA1-7 and BA1-12) from (Pcgn) rock unit. Table 6.2 below summarises the mineralogy. Iron oxide, apatite and zircon occur as traces while epidote occurs mainly as alteration mineral of plagioclase. Orthoclase, plagioclase, quartz and biotite exhibit strong parallel orientation. The rock samples BA1-1, BA1-7 and BA1-12 have been named as quartz- plagioclase-biotite-orthoclase schist, epidote-plagioclase-quartz- orthoclase schist and plagioclase-quartz-orthoclase-biotite schist respectively in the Laboratory Report. However these rocks possess clear gneissic fabric and are therefore gneisses rather than schists, see (Winkler, 1974) on Nomenclature of Common Metamorphic Rocks. Table 6-2 Summary of Thin Section Analysis on Rock Samples from Barol Minerals Mode (%) Sample No BA1-1 BA1-7 BA1-12 Orthoclase 28 19 23 Biotite 25 25 24 Plagioclase 24 15 18 Quartz 15 18 19 Microcline 5 5 - Muscovite 2 1 5 Epidote 1 10 7 Trace 6 4 Apatite Sphene Zircon Trace Trace Trace Trace Trace • Opaque (iron oxide) Trace 1 Trace Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-3 The geological mapping was supported by Aerial photographic interpretation using stereoscopes. Table 6.3.1 below shows the list of aerial photographs used. The Barol Geological Map and Section is attached at the end of this report as Annexl. Table 6-1: List of Aerial Photographs Used for Barol Site Job No Photo Nos Approximate Scale Baro2 Dam Site Tunnel Alignment R-284 30781 - 30782 1:50.000 R-1 7506 - 7514 1:10,000 R-2 7504 - 7496 1:10,000 Geology of the Barol Tunnel Alignment The Barol Hydropower Project area in general and the tunnel alignment in particular is underlain by Precambrian crystalline basement rocks belonging to the Alghe Group (ARI) of the Geological Map of Ethiopia (Mengesha Teferra et al, 1996). These Precambrian crystalline basement rocks mapped here as Pcgn,, Pcgn2 and Pcgn3 are unconformably overlain by basalt lava flows belonging to the Makonnen Basalts (PNmb) of the Geological Map of Ethiopia far away from the Barol area. A significant part of the bed rocks are blanketed by red lateritic soil. Some of the lower reaches of the tributaries of the Baro River and a few other low lying parts of the project area are covered by alluvial deposits consisting of sand, silt and clay. The map units (Geological map attached, see annex 1 at the end of this report) are composite and names assigned to them are based on lithology. The order of Precambrian map units in the legend are arbitrary, as their relationships are unknown. The map units are described in the following sections. There are also identified several structures consisting of foliation, joints and lineaments, whose trends and attitudes are discussed in the following sections. Lithology Migmatitic Gneisses (Pcgn) The Precambrian crystalline basement here consists of gneisses with variable color index and development of layers with abundant migmatitic matenals both as irregular granitic material concordant to foliation and layenng and as cross -cutting veins and dykes of pegmatite and pods of granite and pegmatite. These rocks are more or less continuously exposed along the course of the Baro River. Excellent exposures also occur alonq the NEern segment of the tunnel alignment at three separate places. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-6 Residual Soil (Qe) A considerable part of the tunnel alignment is covered by residual soil derived from the underlying Precambrian basement rocks (Pcgn) described in the preceding section. The soil is buff brown in colour with abundant grains of quartz and other heavy minerals (accessories) and secondary clay. According to bore boles investigation the thickness of the soil overburden along the tunnel alignment area ranges from an average of 6 meters to a maximum of about 20 meters in borehole B2T-6. . Foliation Structure The gneisses that underline the tunnel alignment area contain planar structure with general northerly strike and moderate dips generally to the West. Measurement of strike and dip of foiiation/banding conducted along the Baro River course indicate that the strike of foliation varies from North-South to NE-SW dipping dominantly 35° to 55° towards West and NW respectively. There is a general sub-parallelism of banding and foliation. Equal area stereonets, lower hemisphere projection of poles of foliation indicate the average dip and dip direction to be 16° and 271° respectively (see Annex 4). . Lineament Numerous lineaments, mainly NW-SE and NE-SW trendinq are recogmzab'e from the topography of the area and the anal Phot°9 aph interpretation. These prominent linear features cross r renrlonf r 3 '9™ent area. Most of these features probably cnn^nHH1 faU tS bUt C0uld not be ascerta'ned due to lack of SJer^ TheXp0SUreS 0W'nS t0 thick lateritic soil and heavy forest Somir?i 7 rarF 'n length from half a kilometer to several thesTlWV and9N J T®! °f the Bar0 River itself is controlled by e NW and NE trending features in the project area. X Joints The gneisses and migmatites are generally cross cut by closely to moderately spaced joint sets. They include a few meters to several Molla Belayneh and Mengesha TeferraTertiary Plateau Basalt (Trb) The Northeastern comer of the Barol Project Area is underlain by flat-lying fine grained aphyric Tertiary Basalt Flows (Trb) occurring above about elevation 1600-1700 meters and having a preserved thickness of at least 200 meters. A small erosional remnant cap also occurs at the Southwestern part of the project area. They are assumed to be part of the Miocene Makonnen Plateau Basalt mapped in the south by (Davidson 1983, Mengesha and Seife 1987). The rocks are poorly exposed due to heavy vegetation and thick red lateritic soil cover and were not examined in detail being rather far away from the project area. The base is not exposed, but there is no evidence of deposits between them and the underlying Precambrian basement rocks. The pre-Tertiary erosion surface appears to be largely plane and close to horizontal. The basement rocks lie above it in places, whether they occupy fault blocks or erosional remnants is not established. . Alluvium (Al) Alluvial deposits, sand, silt and clay, having a few meters thickness occur along some banks of the Baro River and its tributaries along the tunnel alignment area. These sediments are deposited during rainy seasons, when the water level increases flooding the main these areas. Alluvial deposits are shown at four separate places. Two of them occur down stream and upstream of the dam axis and the other two X “ a“ ■>« and Men9esha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Bara 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-8 Residual Soil (Qe) Foliation/Banding Residual soil left in situ as a result of dominantly chemical weathering of the underlying bedrocks, cover a significant part of the dam site. Most of the left and right side of the dam areas are blanketed by lateritic soils of acidic igneous origin. In these areas bedrocks exposures are extremely scarce. The deposits are varicolored - dark brown, reddish, pinkish, white, orange, silty clay, clayey sand and sandy clay soils. Quartz, feldspars and flakes of mica are present. Test boreholes carried out along the dam axis during present study program revealed that the residual soil ranges in thickness from an average of 5m to a maximum of 16 to 20 m in boreholes. In one borehole B1D-5 on the right abutment there had been encountered soil, up to 51.4m depth. Structures The gneisses that underlie the dam site contain planar structures with general northerly strike and shallow dips to the west. Attitude of strike and dips of foliation/ layering measurements made along the Baro River course indicate that the strike varies from North to NE directions dipping mainly from 5° - 20° due West or NW. Lower hemisphere equal area stereonet projection of poles to foliation indicate that the average dip is 16° with a dip direction of 270° (see Annex 4). Lineaments Numerous and conspicuous, dominantly NW-SE and NE-SW trending Lineaments are recognizable on the topography of the dam site. These structural features traverse the dam site. Some of these features represent faults which could not be ascertained on the ground and from aerial photographs interpretation due to lack of adequate rock exposures on account of residual soil and heavy forest covers. They range in length from half a kilometer to tens of kilometers. The course of the Baro River itself and its tribuataries are controlled by these NW and NE treading structural features. Joints Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Reso SM Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-7 meters |ong 6g|ll joW sels. Themajorones trend SW-NE, dipping steeply to moderately towards NW and SE. Other major joints trend NW-SE, dipping steeply due SW and NE. Equal area stereonets, lower hemisphere projection of joints indicate the average dip and dip direction to be 88° and 346 respectively with a second average of 82° and 54° respectively (see Annex 4). 6.3.2 Geology of Barol Dam Site General The Barol Dam Axis is situated at N891200 and E759460 (at river level). The dam axis generally trends NE-SW joining two ridges rising from about 1420m at river level to above elevation 1500m on both sides of the Baro River. This is a relatively narrow section although the river branches into two segments here with an island in the middle. Lithology . Migmatitic Gneisses (Pcgn) Alluvium (Al) The dam site is underline by gneisses and migmatite. The gneisses are biotite and hornblende-biotite gneisses. They are light gray and dark gray in color, medium grained slightly weathered and well foliated. They are closely to widely jointed. Migmatitic phases are represented by Mobilsate both as irregular quartzofeldsphatic segregations and as parallel to foliation and layering and as cross cutting veins and dykes of pegmatites. The rocks are more or less continuously exposed along the river course. Outside the river course rock exposures are extremely rare owing to the relatively thick lateritic soil and heavy forest cover. Since the map unit contains abundant resistant pegmatitic materials several ridges with predominant peaks are common in the area. Summary of Petrographic analysis results are given in 6.3.1.1.1 above and the laboratory report, Annex 7 is attached at the end of this report. Alluvium deposits consisting of sand, silt and clay occur along the banks of the Baro River and lower reaches of dry streams downstream and upstream of the dam axis where the gradient of the streams and banks is more or less flat. The deposits are genemlly a few meters thick with underlying bedrock exposuresFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 6-10 6.3.4 The quarry lies on the strike extension of migmatitic gneiss observed in the Baro River bed. There are scattered exposures of rock in the quarry area. Drilling has also revealed rock at shallow depth. The quarry can be used for rock fill and for crushing concrete aggregates. If required sand can also be derived from the rock by crushing. Engineering Geological Considerations Dam and Diversion The Barol Dam will be located at river level near the center on slightly weathered to fresh migmatitic gneisses. Then both the right and left abutment of the dam will be on similar rock but deeply weathered having residual soil 5-22.4m on the left abutment and about 20-51.4m. on the right abutment. There are three NW and three NE trending lineaments crossing the dam axis. The foliation trends vary from North to NE with a shallow dip of 5° -20° due West and NW. Joints including stereo net projection are presented in Annex 4 at the end of this Report. Headrace Tunnel and Power Intake The power intake will be located in migmatitic gneiss. The whole of the headrace tunnel which is aligned on the left bank will be located in migmatitic gneiss. The rocks are fresh, massive and strong at the headrace tunnel level according to the borehole logs. An adit tunnel might not be necessary since there is a surge shaft nearly halfway between the powerhouse and the power intake. The surge shaft is also located in migmatitic gneiss. The lineaments generally trend NE-SW and NNW and North-South. Foliation measurements conducted in outcrops along the Baro River course show strikes varying from North-South to NE-SW. The dip is dominantly 35° to 55° towards West and NW respectively UntJ0CKS>,are 9e"era,ly cut by closely to moderately spaced tight nf ! HhHCh 3re 3 few meters t0 several meters long trending SW- E and dipping steeply to moderately towards NW and SE 9Table 6-3, below shows lineaments crossing the Barol headrace tunnellocratic Republic of Ethiopia - Ministry of Water Resources itudy of Baro 1 & 2 Multipurpose Project Volume 4-Annex 4 F Page 6-9 The gneisses and migmatite that underlie the dam site are traversed by generally closely to moderately spaced joint systems. They include a few meters to several meters long, tight joint sets. The major ones trend SW-NE, dipping steeply to moderately towards NW and SE. Other major joints trend NW-SE, dipping steeply due SW and NE. Annex 4 shows equal area stereonet plots of joints. There are two averages-the first has dip of 84° with a dip direction of 332° while the second average has a dip of 85° and dip direction of 035°. Construction Materials Construction materials were investigated for the Barol hydropower Project as indicated below. • Impen/ious fill • Sand • Gravel • Rock quarry Impervious Fill There is a thick reddish brown residual silty clay upstream of the dam on the right bank. There has been encountered more than 20m of this residual clay in borehole B1D-5 drilled on the right abutment of the dam. This material can be used as an impervious fill for dam core. However test pitting and laboratory analysis should be done. Sand Sand can be acquired from the Alluvial deposit about one to two kilometers upstream of the dam on both banks of the river. Since the deposit is mixed with silt and clay it might require screening and washing. Weathered parts of the migmatitic gneiss could also be bulldozed to produce sand. However in both cases test pitting and laboratory analysis should be done to know their suitability for concrete aggregate. Gravel Deposits of gravel have not been encountered during this phase of investigation. However gravel can be acquired by crushing from the quarry rocks. Rock Quarry The proposed quarry for Baro! is located at UTM coordinates E0758510 and N0891767 and about elevation 1525m meters above sea level about 1.2Km downstream of the dam on the right bank.Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Table 6-4: Lineaments Crossing the Barol Tailrace Tunnel. Volume 4 - Annex 4 F Page 6-12 No Distance from Powerhouse (m) Trend Angle with tunnel 1 140 NE Near vertical 2 360 NE Near vertical 3 950 NE Near vertical Table 2 above, very goo d rock structures (joints The trend of lineaments as can be observed in generally crosses the tunnel axis at favourable angles. The rocks would generally be strong having good to mass strength. However some areas crossed by and foliation) will need rock bolting, shot-creating and grouting. 6.3.5 Conclusion and Recommendation Generally the Barol hydropower project can be said to have thick soil foundations for the dam and appurtenant structures being located on residual soil (derived from Pcgn) except at the river bed where there is fresh rock. The alluvium on the edges of the riverbed will have to be excavated and removed from the dam foundation. Tunnelling conditions will be generally good being located in migmatitic gneiss (Pcgn) which has good to very good rock mass strength where fresh. The gneisses are migmatized and have pods ofgranites Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Table 6-3: Lineaments Crossing the Barol Headrace Tunnel Volume 4 - Annex 4 F Page 6-11 No Distance from Intake (m) Trend Angle with tunnel 1 100 NW A Acute 2 250 NE Near vertical 3 280 NE Acute 4 530 NE Near vertical 5 780 North-South Near vertical 6 890 NE Near vertical 7 1390 NE Near vertical 8 1590 (B1T-3) NE Near vertical 9 1790 NE Near vertical 10 1830 NE Near vertical 11 2070 NW Acute 12 2290 (Powerhouse) NE Acute The trend of lineaments as can be observed in Table 1 above, generally crosses the tunnel axis at favorable angles. The rocks would generally be strong. However some areas crossed by structures (lineaments, joints and foliation) will need rock bolting, shot-creeting, grouting and even rib supporting and concrete lining if the lineaments are faults filled with weak material. Powerhouse The powerhouse which is an underground powerhouse will also be located in migmatitic gneiss. It is expected that structures would not be so rigorous due to the sealing effect of the big depth. The powerhouse area is crossed by one lineament trending NE-SW. This can be avoided by shifting the powerhouse to either side of its present location. The proposed access tunnel to the powerhouse is also located in migmatitic gneiss. It will not be crossing lineaments or it can be aligned not to cross lineaments. Tailrace Tunnel and Tailrace Tunnel Outlet The tailrace tunnel and the tailrace outlet will be located in migmatitic gneiss. Foliation trends are North-South to NE-SW. The dip is dominantly 35° to 55° towards West and NW respectively. There are generally closely to moderately spaced tight joints measured in exposures which are a few meters to several meters long trending SW-NE and dipping steeply to moderately towards NW and SE. Table 6-4, below shows lineaments crossing the Barol headrace tunnel. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-2 All of the previous geological studies were useful in that they provided an understanding of the regional geology and tectonics of the project area. Pre-Feasibility Studies for Hydropower A Pre-feasibility Study for Hydropower Development was carried out by NORPLAN - Norconsult on Barol and Baro2 projects (1999). The following brief summary on the geology was extracted from this study. Soil Investigation At the pre-feasibility level a total of 17 test pits were dug along 8 profiles over the dam axis and intake areas. Four test pits were dug along 1 profile close to the previously proposed tailrace outlet .Figure — shows location of soil profile and test pits. The test pits were logged and a total of 15 soil samples were collected from 13 pits and tested at the then Building Enterprise Laboratory (presently Construction Design Share Company). According to the pre-feasibility study most of the project area is generally covered by residual soil mostly up to 3m thick and rarely up to 4-6 m thickness. The soil is mainly developed on the crystalline basement rock on the right bank and on the left bank where there is basalt the soil is derived from the basalt. Geological mapping During the pre-feasible study program, geological mapping of the Baro2 project area was carried out and a geological map of 1:50,000 scale of a reconnaissance nature has been prepared. According to this study the area is underlain by Precambrian basement rocks overlain by tertiary basalt flows. The basement was described to be quartz, feldspar, biotite gneiss, hornblende schist, and syn-tectonic granite. The project area is reported to be dominantly underlain by crystalline basement rocks. The dam site and the power intake are reported to be located on qU KrtZ fe,dsP " ar bi °tite gneiss. The headrace tunnel and the ondTb °*USr are reported t0 be located on the syn-tectonic granite schist Th^C.® >-Unne] iS reported t0 be 'ocated on hornblende and din f°^atl0n of the recks mentioned generally trends N-S ie^PJ-feasibiS^0? maP Pin 9 , - and ,au,,s haS made a lot of imPrevement to andcorSSon^h Y 9eo'°9lca' map. including addition of detail section h ® required as can be observed in the following ________________________________________________________________ Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-1 7 7.1 7.1.1 7.1.2 BAR02 HYDROPOWER PROJECT General Background The Baro2 Hydropower Project is a cascade of Barol where the main regulation dam is located at Bard, and Baro2 has a diversion dam. There had been conducted a pre-feasibility study in 1998. The Scheme consists of dam, headrace tunnel, powerhouse and tailrace tunnel including other appurtenant structures. Location and Access The project is situated between coordinates UTM 896000 N to 904000N and 736000E to 748000 E. It can be reached by dry season track that turns south from the main Addis Ababa - Gambela road at about 4Kms west of Sibo Town which is located 690 km from Addis Ababa. The dam site is about 17 km from Sibo Town. At about 11 kms from Sibo is Jejebi Majanger settlement where the track branches into two. The left one about 5Km goes up to the dam site where as the right one about 12Km takes to the power plant and tailrace outlet sites. 7.2 Previous Studies 7.2.1 Geological Studies A review of the relevant previous geological studies close to or adjacent to the current hydropower project sites is presented in this section. The 1: 2,000,000 scale 1” edition Geological Map of Ethiopia (Kazmin, 1972a) and its explanatory Note (Kazmin, 1975) and the 2nd Edition Geological Map of Ethiopia (Mengesha Shiferaw et al, 1996) and its accompanying explanatory note provide a broad overview of the Geology of Ethiopia in general. The Gore Map Sheet (Nc 36 -16) was mapped at 1; 250,000 scale by Mengesha and Seife (1987) De Wit (1977) provided a short account on the geology of part of the map sheet. Kazmin (1971, 1972b, 1975a and b) proposed the first stratigraphic subdivisions and tectonic synthesis of the Precambrian rocks of Ethiopia. Kazmin et. al. (1978,1979) interpreted the geology of western Ethiopia in light of plate tectonic considerations. More detailed maps of parts of western Ethiopian shield were published by the United Nations Development (Davidson, 1973 ). As part of the Integrated Maser Plan study, the Survey and Analysis of the Baro- Akobo River basin produced 1:250,000 scale geological maps of the entire basin (ARDCO-EOSERV, 1994). A 1. 1,000,000 scale Geological map and an accompanying geological report of the whole of Oromiya Region was compiled bv (Geodev-Afredis, 1999). J Molla Belayneh and Mengesha TeferraVolume 4 - Annex 4 F Page 7-4 There are also identified several structures consisting of foliation, joints and lineaments, whose trends and attitudes are discussed in the following sections. Lithology Intercalated Biotite, Hornblende-Biotite and Biotite-Quartzofeldspathic Gneisses, Locally Migmatised and Banded [Pcgnj] Intercalated biotite, hornblende-biotite and biotite-quartzofeldspathic gneisses locally migmatised and banded [Pcgn,] underlie much of the project area. They are well exposed all along the Baro River bed. Outside the Baro River course, outcrop is scarce due to heavy forest and residual red lateritic soil cover and in some cases also colluvium mapped together with the lateritic soil. The rocks are layered on a scale of 5cm to 100cm. They are more probably paragneisses. The predominant rock types are strongly foliated, light gray to pink, medium grained biotite, homblede-biotite and quartzo feldspathic gneisses. The gneisses typically consist of sodic plagioclase, microcline, quartz, biotite, hornblende and epidote. Some of the gneisses are migmatised, cut by numerous subconcordant lenses of granitic and pegmatitic material, see photo No. 3, Annex 8. Discordant dykes and pods of pegmatite and granite also occur. The foliation/layering generally trend from NW-NE and dip shallowly towards SW, NE and W. They are cut by widely spaced tight joint systems whose trend vary from SW to NW and dip NW or SW. The biotite gneiss is light gray in colour, medium grained, well foliated, faintly to slightly weathered, thinly layered on millimeter scale. In places strongly migmatised and shows bandings. The hornblende-biotite gneiss is dark gray in color, well foliated, medium grained, slightly weathered, locally strongly migmatised. The quartzofeldspathic gneiss is white to pink in colour, well foliated, faintly weathered, coarse grained and intercalated with the biotite gneiss. Molla Belayneh and Mengesha Teferra, Federal DemocraFteic dRereaplOubelmic oo«faElitcRhioeppiaub-licofElhiopia-U^^ ’'^ o ale,^eSOUraS Volume 4-Annex 4 F Page 7-3 ) Feasibility Study of Baro 1 & 2 Multipurpose Project ------------------------ —Hydropower Project Present Geological Studies of the Area The current 9 *^ e app^9 were mapped. Where the overburden is thick and extensive inis was shown including the bed rock from which it was denved. The geological mapping was supported by Aerial photographic interpretation using stereoscopes. Table 7-1 below shows the list 0 aerial photographs used. The Baro2 Geological Map and Section is attached at the end of this report as Annex2. Table 7-1: List of Aerial Photographs Used for Baro2 Site Job No Photo Nos Approximate Scale Baro2 Dam Site Tunnel Alignment R-1 7594-7599 1:40,000 R-2 7669 - 7671 1:40,000 R-1 7543 - 7547 1:10,000 R-2 7669 - 7671 1:10,000 7.3.1 Geology of the Baro2 Tunnel Alignment The Baro2 Hydropower Project area in general and the tunnel a ignment in particular is underlain by Precambrian crystalline basement rocks belonging to the Alghe Group (ARI) of the Geological Map of Ethiopia (Mengesha Teferra et al 1996) wh ch is referred to as Geba Domain in the Gore Sheet M (Mengesha Teferra et al 1987) These Pro 61 P®°09 ca Map basement rocks mapped here as Pwn Pc^n T^'30 ^stalline unconformably overlain by basalMnvo Pcgn3 and Pcgt are Mekonen Basalts (PNmbM the Ulni away from the Baro2 area A vounna ogical MaP of Ethiopia far 9 ’n9 ‘° the flow (Ba) not shown on theVeolSM9'00'^ porphyritic basalt lower elevations than the Makonenb^tshaJ TT 3’ °CCUpying unconformably overlying the basement < • a so been identified Photo Nos. 1 and 2 Annex 8 Sj™ksthe Baro2 area, see blanketed by red lateritic soil SomSl^ °f the bed rocks are tributaries of the Baro River and a fL L?® °Wer reaches of ‘he project area are covered by alluvial denn^ °W lying parts of the and cla*- The map units (Geological . ' deposits consisting of sand, silt lhe following sections. BelaVnehand Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Bam 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-6 and define the foliation. Sample number BA2-19 is named as meta - biotite granite pegmatite while sample number BA2-63 is named as epidote-biotite-plagioclase quartz schist. The rock is named as schist in the Laboratory Report. However the rock possesses clear gneissic fabric and is therefore gneiss rather than schist, (see Winkler, 1974) on Nomenclature of Common Metamorphic Rocks). Metadiorite, Metagabbro, Amphibolite and hornblendite (Pcgn,) The extreme western section of the tunnel alignment and outlet of the tunnel area is underlain by intermediate to ultramafic plutonic intrusives. The predominant rock is relatively uniform, strongly foliated, fresh, dark gray metadiorite that locally grades into amphibolite and also contains layers and pods of metagabro and metahomblendite. The metadiorite comprises mainly of andesine, horblende and biotite with accessory quartz, magnetite, epidote and apatite. Xenoliths of mafic rocks and hornblende porhyroblasts are common. The amphibolite is fresh, dark gray, fine to medium grained, and foliated in places by network of thin quartz veins. The metagabro is faintly weathered, coarse grained, dark gray and cut by variously oriented, quartz veins and joints. The hornblendite is faintly weathered, very coarse grained, dark green and massive looking. Xenoliths of gneissic rocks, mafic rocks, quartz veins are common in the hornblendite. It consists of mainly hornblende 92%, accessories of plagioclase and quartz and traces of chlorite and opaque minerals. Thin section and petrography analysis on sample numbers (BA2- 51A and BA2-41) field coded (BA2-53 and BA2-43) indicate that the metadiorite/quartz metadiorite is is given in Table 7.3 below. Eprdote and chlorite are alteration products of plagioclase and hornblende respectively. Porphyroblasts of hornblende enclose quartz and plagioclase (poikiloblastic texture). Hornblende plagioclase and quartz are aligned. According to the laboratory, sample numbers BA2-51A and BA2-41 are named as plagioclase- homblende-quartz-biotite and quartz-plagioclase-homblende schists respectively. Field description is as given in the subject above. Thin section and petrography on sample numbers BA2-35 and BA2- 53 corresponding to field code numbers BA2-37 and BA2-55 identified in the field as amphibolite is given in Table 7.3 below. Muscovite/sericite and epidote are alteration minerals of plagioclase. Actinolite-hornblende, epidote and sericite are aligned. The sample numbers BA2-35 And BA2-53 are termed by the laboratory as plagioclase-quartz-homblende-biotite and quartz- seridte-epidote-actinolite-homblende schists. Molla Belayneh and Mengesha TeferraThe laboratory report. Knnex 7 « attached at the end of this report BtoUttto Ottoogte**» Minor BtoUto Gnafes (Pcgni) The tunnel ft toe dam axis area * underlain by relatively uniform, coarse grained. well tokated. white to pink, shghtfy weathered biotite orthognerss of grantac composition and plutonic ongm It is oA by pegmatite dykes and quartz veins. It is also cut by widely spaced, tight joftt systems Trend of joints vary from SW to NW and dtp steeply SE.NandSW The tohaton of the host rock stoke NW and (j<p shakowty due SW It is well exposed along to Baro River course as large slabs or blocks It is mainly composed of quartz, feldspars wtob^We OUtwfe the BaroRtvercouree towards North and South outcrop is scarce owing due to Latentjc soil cover and dense forest A summary of thin secton and petrography analysis on four samples with ted code names (BA2-19. BA2-20. BA2-63and BA2- 65)* gwen m I abto 7 3 below Muscovte/sendte and calcite occur as aterftjon products ct feldspars while ententes are from biotte Quartz, ptogftdase nvcrodme and bwtrte show parallel alignment Motta BeUyneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Table 7-3: Summary of Thin Section Analysis Volume 4 - Annex 4 F Page 7-8 The laboratory report Annex 7, is attached at the end of this report. Late-Post Tectonic Granite (Pcgt) deformed a^n'it^N T* . rel at vel .‘ y ^dimensional and little extremZo9? 6 plutonic intrusive body. It is found in the the qeoloo?a e m C mer | ° °f th® prOject area outside the limits 9 ological map area. However the geological map was Molla Belayneh and Mengesha Teferra... »xAlotor resources Federal Democratic Republic of Ethiopia - Ministry of Water Kesuu Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page Thin section and petrograpi^rt^^ed out on the metagabro sample numbers BA2-51B and BA2-52B, corresponding to field code Nos. BA2-53 and BA2-54 is given in Table 7.3 below. Porphyroblasts of hornblende enclose quartz, plagioclase and apatite (qoikiloblastic texture). Hornblende, plagioclase and biotite are aligned. The sample Nos. BA2-51B and BA2-52B are termed as quartz-plagioclase-homblende and rutile-sphene-actinolite- homblende schists. However the samples in the field are observed to be metagabro and are als close to hornblendite. Thin section and petrography analysis carried out on the metahomblendite sample number BA2-52A corresponding to field code No. BA2-54 is given in Table 7.3 below. Chlorite and talc are products of alteration of tremolite. Iron oxide (magnetite) occurs as porphyroblasts in aground mass of tremolite, chlorite and talc. Talc and chlorite are aligned. It is termed as talc-tremolite schist in the laboratory report. However the rock does not show schistosity and the field observation shows meta-ultramafic rock. The laboratory report, Annex 7 is attached at the end of this report. a Be,ayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-10 indicating the deposits have not been much transported. In Borehole B2T-2 about 10m of alluvium has been encountered. Residual Soil (Qe) The project area, except the Baro river course is covered by residual soil. The thickness generally ranges between 1-3 meter. The project area is basically underlain by gneisses (acidic coyote?) and metadiorite, amhibolite, metagabbro and metahomblendite (intermediate-basic-ultrabasic composition) and the Tertiary Basalt flows (basic composition). Residual deposits left by weathering of granites and gneisses are characterised by an abundance of quartz grains released by the decomposition of the less stable silicates. The feldspars will be largely destroyed in the process. The residue consists of quartz, biotite, muscovite, and accessesory minerals (heavy minerals) of the parent rock and an accumulation of secondary clay. The residual soil is commonly buff brown to yellowish brown. Residual deposits left by basic igneous origin differ from the acid ones by their complete lack of quartz grains. Because of the abundance of ferro-magnessian minerals in these type of rock (dolerite , gabro, basalt) the residue tend to contain a high proportion! of ferric oxide mixed with various clay minerals as a result the residual deposit become reddish brown in colour. The top soil is commonly a mixture of residual soil and organic matter in places where the whole basaltic rock is weathered, the soil thickness increases. For instance at Borehole B2T-3, 11 meters of residual soil is encountered during drilling. In general there is no colluvial soil due to the thick vegetation cover inhibiting transport of soil. Structures The foliation/layering in the gneissic rocks trend varies from NW-SE to NE-SW and invariably dips SW and NW respectively. The dominant trend is however NW and rarely NE and dips shallowly (5-35)° to the south west. Stereographic plots are given in Annex 5 at the end of this report. The average dip and dip direction are 24° and 270° respectively, for the whole of the BA2 project area. Molla Belayneh and Mengesha Teferra ■:V.Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-9 later extended to include it due to its suitability as rock quarry. It forms a prominent oval shaped ridge about (400 x 1000)m intruding into the biotite ortho-gneiss (Pcgn2). The granite is slightly weathered, pink, coarse grained, and consists mainly of K-feldspar (microcline), plagioclase, quartz, biotite and minor hornblende. Similar bodies north of here can be observed and it is presumed that these bodies are extensions of the huge granite plutonic body that occurs in the area. Plagioclase-Phyric Basalt Lava Flows (Ba) Alluvium (Al) The North western and SEem parts of the project area above about 1300m elevation are underlain by flat lying, slightly weathered, fine grained, light grey, phyric basalt flows that have a preserved thickness of a few tens of meters. The lavas are poorly exposed, being heavily vegetated and covered by red lateritic soil. The rocks are exposed in a bouldery pattern. Nowhere was the base of the lava seen, but there is no evidence of deposits between them and the underlying Precambrian Rocks, see photo Nos. 1,2 and 4, Annex 8. They are separated by paleosoils developed on the basement rocks. In places the basement rocks occur above it topographically. Probably these occupy fault blocks or are erosional remnants. Its age and correlation are unknown. It occurs at about 300 meters lower elevation than the Tertiary plateau basalt (Makonen Basalts-PNmb on the 1996 Geological map of Ethiopia) flows to the North. It is presumably younger than the plateau flood basalt. The rocks is vesicular , bearing coarse plagioclase phenocrysts. Thin section and petrography analysis carried out on the basalt, sample number BA2-47 corresponding to field code No. BA2-49 is given in Table 7.3 above. Phenocrysts of plagioclase (labradorite and bytownite) are embedded in a matrix composed of plagioclase and pyroxene. Some of the grains of plagioclase and pyroxene are coated by iron oxide. Calcite and iron oxide occur as cavity fillings. It is named by the laboratory as porphyritic basalt similar to the field observation. Low gradient wide valleys and low lying flat banks of the Baro River are underlain by 1-3m thick alluvial sand silt and clay. The deposits are varicolored. The top soil is black clay 20-30 cm thick followed by red silt 30-40cm thick and then followed by white to pink and brown course sand deposit with angular quartz, feldspar and mica flakes Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-12 The Dam Site is underlain by biotite orthgneiss. In outcrops it is observed to be faintly to slightly weathered, coarse grained white to pink well foliated and flat lying. The rock is well exposed all along the Baro River course as flat lying, slaby exposure. Outside the river course to the North and South where extensive soil cover occurs scattered small exposures occur as outliers. The rock consists of K. feldspar, plagioclase, quartz and biotite (5-7%). Plagioclase occurs as porphyroblast. Foliation trends NW and dips shallowly (5-15°)SW. It is cross cut by various trending very widely spaced joint systems. The trends dominantly vary from SW to NW and dip steeply NW, W and SW respectively. It is closely cut by pegmatites and quartz veins. Thin section and petrography analysis are given in Table 7-3 above. Plagioclase-Phyric Basalt Flows (Ba) The NEern and Southern segments of the dam site above 1300m are covered by distinctive vesicular flat lying, fine grained, light gray, plagioclase-phyric Tertiary Basalt flows, that have a preserved thickness of tens of meters. Its age and correlation is not known. It is presumably younger than the plateau basalt flows to the North and South of the project area. Thin section and petrography analysis are given above. Alluvium (Al) Both banks of the Baro River from 1295 meters to up to 1300 meters is filled by buff brown sand, silt and clay. The swampy valley over 100 meters wide on the eastern side of the right segment of the dam is underlain by buff brown, 3-4 meters thick sand, silt and clay. The alluvium is underlain by the biotite orthogneiss described before. Residual Soil (Qe) During the present mapping activities it is noted that the project area is largely covered by red lateritic soil. Test pits dug earlier in the vicinity and along the dam axis indicate that the dam site area is covered by relatively thin soil, mostly up to 3 meters thick, residual soil. The soil is developed both on the orthogenesis and plagioclase-phyric basalt described before. The soil developed on the orthogneiss is mostly buff brown in colour with abundance of quart grains and some biotite and heavy minerals from the parent rock and secondary clay. The soil developed on the basalt is mostly reddish brown in colour with no quartz grains but high content of ferric oxide mixed with various clay minerals. In general there is no colluvial soil due to the thick vegetation cover preventing transport of soil. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Volume 4 - Annex 4 F Feasibility Study of Baro 1 & 2 Multipurpose Projed Pa9e 7-11 Jneaments Numerous conspicuous lineaments, dominantly NW - SE and NE SW are recognisable in the topography of the project area from interpretation of aerial photographs. Many these are probably faults, but could not be proved on account of lack of outcrops owing to soil and heavy forest cover. They generally range in length from a few kilometers to tens of Kilometers. The Baro river course represents a remarkable (North west - SE) trending lineament and most probably structurally controlled. Joints The Precambrian basement rocks are cut by widely to very widely spaced tight joint systems whose trend vary from [SW to NW and dip steeply to vertical towards NW and rarely SE and SW and NE respectively. They are mostly 5 to over 20m long. In addition North-South and East-West, dipping towards West and North and rarely East and South respectively are common. The stereographic net plot gives an average dip and dip direction of 88 and 143 respectively. Stereographic plots are given in Annex 5 at the end of this report. 7.3.2 Geology of Baro2 Dam Site General The Baro2 Dam Axis is situated at about N898060 and E747300 (dam ax.s centre). The dam axis generally trends NW-SE ioininq two ridges rising above elevation 1300m on both sides of th£ rS This part of the Bare River fotTO , relaZ, Litholoqv The Dam Site is underlain bv biotitP unconformably by plagioclase porphyritic ba«it .ho9"eiss overlain margins of the Baro River, KioEflow. Along the alluvial deposits. In the rest of the dam c »e'SS IS covered bY orthogneiss and the basalt are concealed maini aLea the biotitie cover. ^ncealed mainly by residual soil Biotite Orthogneiss (Pcgn ) 2Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-14 The stereographic net plot gives an average dip and dip direction of 88° and 143° respectively. Stereographic plots are given in Annex 5 at the end of this report. 7.3.3 Construction Materials Construction materials were investigated for the Baro2 and Genji Hydropower projects in the same locality since the projects are reasonably close to each other. The following construction materials were investigated: • Impervious fill • Sand • Gravel • Rock quarry Impervious Fill There is reddish brown residual silty clay upstream of the dam on the right bank. There had been conducted test pitting. This material can be used as an impervious fill for dam core. However test pits indicate shallow thickness of the clay although there is found a thickness of more than 6m in one test pit. Sand Sand can be acquired from the alluvial deposit in the vicinity of the dam preferably upstream of the dam (for environmental concerns) on both banks of the river. Since the deposit is mixed with silt and clay it might require screening and washing. Weathered parts of the migmatitic gneiss could also be bulldozed to produce sand. However in both cases test pitting and laboratory analysis should be done to know their suitability for concrete aggregate. Gravel Deposits of gravel have not been encountered during this phase of investigation. However gravel can be acquired by crushing from the quarry rocks. Rock Quarry The proposed quarry for Baro2 is located at UTM coordinates E0748934 and N0899129 and about elevation 1400m on a Late- post Tectonic granite (Pcgt) pluton rising to elevation of about 1465 Molla Belayneh and Mengesha TeferraVolume 4 - Annex 4 F Federal Democratic Republic of Ethiopia - Ministry of Water Resources Page 7-13 ( Feasibility Study of Baro 1 & 2 Multipurpose Project Foliation Structures The foliation of the biotite orthogneiss that underline the dam site area strikes dominantly NW (310 - 355 NW) and rarely N-S and NE and dips dominantly 15-20° (in the range 5-10° locally) and shallower, towards SW and rarely West and NW respectively. Data on the attitude of foliation in the Dam site area is presented on the geological map 1:2,000 attached with this report. Stereographic plots are presented in Annex 5 at the end of this report. There is a predominantly NW-SE structural trend and shallow dip towards SW in the Dam Site area. The stereographic net plot gives an average dip and dip direction of 12° and 270° respectively. Stereographic plots are given in Annex 5 at the end of this report. Lineaments Joints The dame site is criss-crossed by a net work of variously trending numerous lineaments a few meters to several tens of maters long. These can be easily detected from aerial photographs interpretation The nature of these lineaments could not be established from the aerial photographs interpretation nor from ground traverses on account of lack of continuous exposure due to extensive lateritic soil and heavy forest cover. The dam site is dominantly underlain by biotitite orthrogneiss. It is cut by widely spaced joint systems. The joints are tight and a few meters to several meters long (20 - 50)m and 1 to 2 meters apart. The trend varies from SW (260° W) to North- NE (5° NE). The dip of these joint systems is dominantly steep to vertical, the dip of then fruit sillies is commensally steep to vertical (70- 90)°. The dip direction varies from SW to North and rarely towards NE and SE. It is also cut by up to 20 cm wide and several meters long pegmatite dykes trending SW. The dip ranges from 65 NW to vertical. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Table 7-2: Lineaments Crossing the Headrace Tunnel Volume 4 • Annex 4 F Page 7-16 No Approximate Distance from Intake (m) Trend Angle with tunnel 1 150 NW Acute 2 1350 East-West Near vertical 3 1950 East-West Near vertical 4 3150 East-West Approximately 45° 5 4600 East-West Near vertical 6 4980 North-South Vertical The trend of lineaments as can be observed in Table 6.3.2 above, generally crosses the tunnel axis at favorable angles. The rocks would generally be strong having good to very good rock mass strength. However some areas crossed by structures (lineaments, joints and foliation) will need rock bolting, shot- creeting, grouting and even rib supporting and concrete lining if the lineaments are faults filled with weak material. Powerhouse The powerhouse which is an underground powerhouse will also be located in (Pcgn,). the rock type described above. Here also the rocks would generally be strong having good to very good rock mass strength. It is expected that structures would not be so rigorous due to the sealing effect of the big depth. The powerhouse area is not crossed by lineaments. The proposed access tunnel to the powerhouse was investigated by extending the originally planned fieldwork time. A portal site for the access tunnel was chosen at UTM coordinates 0741160 E and 0901800 N on a steep slope 50° to 60° South. Photos 6 and 7, Annex 8, show an overview of the powerhouse access tunnel site. There are also rock exposures below, in the Baro River, see photos 7 and 8, Annex 8. The rocks are (Pcgn,) and generally there are no lineaments here. Tailrace Tunnel and Tailrace Tunnel Outlet The first 3500m of the tailrace will also be located in (Pcgn5), the rock type described above. The remaining stretch of the tailrace tunnel and the tailrace tunnel outlet will be located in intermediate to ultramafic plutonic intrusives-Pcgn3 (metadiorite, metagabro, amphibolite and hornblendite) that is slightly weathered to fresh on surface outcrops. The tailrace tunnel outlet was investigated during an extended fieldwork. The outlet is located at UTM coordinates 0736210 E and 0902840 N, see photos 11 and 12. Photo 13 shows an overview of the tailrace outlet area. The general foliation trend varies from 350° to NE (10-20)° and dip ranges from45° to 83° SW and NW Molla Belayneh and Mengesha TeferraDemocratic Republic of Ethiopia - Ministry of Water Resources Volume 4 An^ $ ity Study of Baro 1 & 2 Multipurpose Project meters above sea level at about 1.2Km upstream of the dam in NE direction on the right bank. It forms a prominent oval shaped ridge about (400 x 1000)m. There are extensive exposures of rock. The quarry (see photo No. 5, Annex 8) can be used for rock fill and for crushing concrete aggregates. If required sand can also be derived from the rock by crushing. Engineering Geological Considerations Dam and Diversion The Baro2 Dam will be located at river level near the center on slightly weathered biotite-orthogneiss (Pcgn2). followed by about 230m of alluvium (Al) and about 210m of biotite-orthogneiss (Pcgn^ covered by residual soil of about 3m? thick on the left abutment. Then the right abutment of the dam will be on basalt (Ba) for about 320m covered with residual soil of about (2-3)m? thick and in places having basalt rock outcrop. The Diversion will be located in fresh to slightly weathered biotite-orthogneiss. Foundation depths will vary on type of dam selected. However the alluvium and the residual soil might need to be removed. There are two lineaments trending NE-SW crossing the dam axis near its center and another one trending ENE-WSW crossing the dam axis on the right abutment. Foliation trends are generally NNE- SSW with a shallow dip of 5° -15° to the SW. Joints including stereo net projection are presented in Annex-1 at the end of this Report. Headrace Tunnel and Power Intake The power intake will be located in biotite-orthogneiss. Approximately the first 350m of the headrace tunnel will also be located in biotite-orthogneiss. The rest of the headrace tunnel about 6000m will be located in the intercalated biotite, hornblende-biotite and biotite-quartzofeldsphatic gneiss (Pcgn,). The rocks are stratified on 1cm to 100cm scale and are probably paragneisses. The predominant rock types are strongly foliated, light gray to pink, medium grained. Some of the gneisses are migmatitic, cut by numerous sub-concordant lenses of granitic and pegmatitic material. Discordant dykes and pods of pegmatite and granite also occur. An adit tunnel for the headrace tunnel can be driven from a portal downstream of B2T-2 on the bank of a tributary of the Baro River. The rocks here are (Pcgn,). The adit tunnel should be aligned to avoid a near by lineament. SVV, NE. The rocks are also cut by widely spaced tight joint systems k c tu gentra"y tre ndS , NWt0 NE and diPs shallowly towards ^ose trend vary from NW to SE and have steep to vertical dip. Table 7.2. below shows linements crossing the headrace tunnel Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 7-18 mostly in orthogneisses (Pcgn2) and to a certain extent in basalt (Ba) on part of the left abutment. The alluvium on the edges of the riverbed will have to be excavated and removed from the dam foundation. Tunneling conditions will also be generally good being located in various types of gneisses (Pcgn1t Pcgn^ and intermediate to ultramafic plutonic intrusives (Pcgn3) all of which have good to very good rock mass strengths. The gneisses are locally migmatized and have pods of granites, while the intrusives consist of metadiorites which locally grade to amphibolites, hornblendites and meta gabbro. Mo,la Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project respectively. The joint sets generally trend NW, NE and'North Volume 4-Annex 4 F Page 7-17 South and dip ranges from 22’-75> SW. SE and East During ths period the water level in the Baro river had risen and covered all rock exposures in the riverbed. An adit tunnel for the tailrace tunnel was located at UTM coordinates E0739260 and N0902700. Here the inclination of the slope is in the order of 50° to 60° (see photos 6 and 8) with abundant scattered rock exposures along the slope indicating relatively thin soil cover. The soil cover is estimated to be approximately 20cm to 50cm. The rock consists of inter-layering of slightly weathered, light grey to dark grey, fine to medium grained, moderately jointed, well foliated biotite, hornblende-biotite and white quortzofeldsphatic gneisses that are cut by pegmatite dykes and quartz veins. They are well exposed along the Baro River course (see photos 9 and 10). The general trend of the foliation varies from NW (350°), N-S and NE (10°) and dips 45° to 75° SW, W and NW. The joints generally trend SW-NE, NW-SE and dip gently towards SE and NE respectively. Table 7-1, below shows lineaments crossing the tail race tunnel of Baro2. Table7-4: Lineaments Crossing theTailrace Tunnel No Approximate Distance from Intake (m) Trend Angle with tunnel 1 900 NE Acute angle 2 1850 NE Approximately 45° 3 2950 NNW Nearly Vertical 4 3900 NNW Nearly Vertical 5 4080 NE Approximately 45° L! 4580 NNE Nearly Vertical L2 4800 NNE Nearly Vertical | 8? | 4950 NS Vertical The rocks would generally be strong. However some areas crossed by structures (lineaments, joints and foliation) will need rock boltinq shot-creating, grouting and even rib supporting and concrete lining if the lineaments are faults, filled with weak material. 9 The trend of lineaments as can be observed in Table 6.3 3 above generally cross the tunnel axis at favorable . u- u ’ 7.3.5 ^emfluence of the lineaments will be over a short lengtfiTthe Conclusion and Recommendation Generally the Baro2 hydropower project can ha < foundations for the dam and appurtenant structures being"VSFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 8-2 8.2.2 8.3 All of the previous geological studies were useful in that they provided an understanding of the regional geology and tectonics of the project area. Pre-Feasibility Study Pre-feasibility study was not conducted on the Genji Hydropower Project. The reconnaissance geological map of 1:50,000 scale of Baro2 mapped during the feasibility study includes the Genji Hydropower Project area. Present Geological Study of the Genji Hydropower Project The current geological mapping includes general geology of the tunnel alignment at a Scale of 1:10,000 and detailed geological mapping of the dam site at a scale of 1:2,000. Lithology as well as structures were mapped. Where the overburden is thick and extensive this was shown including the bedrock from which it was derived. The geological mapping was supported by Aerial photographic interpretation using stereoscopes. Table 8-1 below shows the list of aerial photographs used. The Genji Geological Map and Section is attached at the end of this report as Annex3. Table 8-1: List of Aerial Photographs Used 8.3.1 Geology of the Genji Tunnel Alignment The Genji Hydropower Project area in general and the Tunnel alignment in particular is underlain by intercalated biotite, hornblende-biotite and biotite-quartzofeldsphatic gneisses locally migmatized and banded, belonging to the Alghe Group (ARI) of the Geological Map of Ethiopia (Mengesha Shiferaw et al, 1996). It is overlain by flat lying plagioclase phyric basalt flow which is not shown in the above Geological Map. A significant part of these rocks are mantled by residual soil. Much of the area is also covered by dense tropical rain forest. In these covered areas rock exposure is scarce and inadequate for geological mapping. Molla Belayneh and Mengesha Teferraleral Democratic Republic of Ethiopia - Ministry of Water Resources rsibility Study of Baro 1 & 2 Multipurpose Project Volume 4-Annex 4 F Page 8-1 1 GENJI HYDROPOWER PROJECT General Background Genji River is a Tributary of the Baro River joining it about 3 Km downstream of the Baro2 Dam Site. The Scheme is to divert the Genji River to the Baro2 powerhouse and it consists of a diversion dam and a headrace tunnel that connects with the Baro2 powerhouse. The Genji Scheme was not included in the 1998 Pre feasibility study of Barol and Baro2. Location and Access The Genji Hydropower Project is bounded by co-ordinates UTM 746000E to 742000E and 897000N to 903000N. It can be reached by the same route mentioned for BA-2 from Sibo village and by crossing the Baro River South of Jejebi Majenger settlement. The Baro river can be crossed by locally made bridges or at places where the river spreads over large areas during the dry seasons. Previous Studies Geological Studies A review of the relevant previous geological studies close to or adjacent to the current hydropower project sites is presented in this section. The 1: 2,000,000 Scale 1st edition Geological Map of Ethiopia (Kazmin, 1972a) and its explanatory Note (Kazmin, 1975) and the 2nd Edition Geological Map of Ethiopia (Mengesha et al, 1996) and its accompanying explanatory note provide a broad overview of the Geology of Ethiopia in general. The Gore map Sheet (Nc 36 -16) was mapped at 1; 250,000 scale by Mengesha and Seife (1987) De Wit (1977) provided a short account on the geology of part of the map sheet. Kazmin (1971, 1972b, 1975a and b) proposed the first stratigraphic subdivisions and tectonic synthesis of the Precambrian rocks of Ethiopia. Kazmin et. al. (1978,1979) interpreted the geology of western Ethiopia in light of plate tectonic considerations. More detailed maps of parts of western Ethiopian shield were published by the United Nations Development (Davidson, 1973 ). As part of the Integrated Maser Plan study, the Survey and Analysis of the Baro- Akobo River Basin produced 1:250,000 scale geological maps of the entire basin (ARDCO-EOSERV, 1994). A 1: 1,000,000 scale Geological Map and an accompanying Geological Report of the whole of Oromiya Region was compiled bv (Geodev- Afredis, 1999). Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 8-4 . Plagioclase-Phyric Basalt flows (Ba) Residual soil In the western and eastern part of the area the Precambrian sequences are unconformably overlain above about 1300 meters by flat lying, tertiary basalts flows that are light gray, distinctively vesicular and having coarse plagioclase phenocrysts, with a preserved thickness of a few tens of meters. Generally it is vesicular, porphyritic basalt with large phenocrysits of plagioclase. However it is mostly covered by dense forest and residual soil. Its age and correlation is not known. It is presumably younger than the plateau flood basalt flows to the north and south of the project area. Thin section and petrography analysis is given in Table 8.2 above. The Precambrian succession on the east and west side of the Genji River course is covered by dense forest and residual soil as a result rock exposure in this part of the area is scarce. During the current mapping activities, it is noted that the project site is dominantly covered by residual soil and dense forest. The soil is developed both on the Precambrian and basaltic rocks. In general there is no colluvial soil due to the thick vegetation cover preventing transport of soil. Structures r Foliation frImfiH°Mryerin9 in the 9neissic successions trend variously t0 and dips shallow|yt0 moderately varying from 15° to North wsTanddSsW dOml'”nt “a‘”n '"Snd h0We''er iS Molla Belayneh and Mengesha Teferrasderal Democratic Republic of Ethiopia - Ministry of Water Resources jasibility Study of Baro 1 & 2 Multipurpose Project Lithology Volume 4-Annex 4 F Page 8-3 calated Biotite, Hornblende-Biotite and Biotite-quartzofeldsphatic Gneisses Locally zed and Banded (Pcgn,) These rocks are well exposed all along the Genji River and Baro River courses underlie the entire tunnel alignment. Outside the Genji River and Baro River courses rock exposure is scare owning to heavy forest and residual soil cover. The dominant rock types are fresh to faintly weathered, strongly foliated, light gray to pink, white, medium grained, biotitite, hornblende-biotite, biotitie— guartzofeldspathic gneisses, locally migmatized and banded. They are interlayered on 1cm to 100cm scale. They are more probably para-gneisses. The layering is possibly primary sedimentary feature. Some of the gniesses are migmatites cut by numerous subconcordant lenses of granitic and pegmatitic material. Discordant dykes and pods of pegmatite ande granite also occur. Thin section and petrographic analysis on the hornblende-biotite gneiss sample Number GD-7B is given in Table 8.2. Epidote, calcite and muscovite are alteration products of feldspars. Quartz, hornblende, plagioclase and biotite show strong parallel alignment defining the foliation plane. It is termed by the laboratory as homblende-plagioclase-biotite-quartz schist. However the rock possesses clear gneissic fabric and is therefore gneiss rather than schist, (see Winkler, 1974) on Nomenclature of Common Metamorphic Rocks). The laboratory report, Annex 7 is attached at the end of this report. Thin section and petrographic analysis on the quartzofeldsphatic gneiss sample number GD-7A is given in Table 8.2 below. K- feldspar shows minor sericitization. Plagioclase shows antiperthitic texture. Orthoclase, microcline, plagioclase and biotite show parallel alignment and define the foliation plane. The sample is named as metabiotite granite pegmatite in the laboratory report. Table 8.2: Summary of Thin Section Analysis Sample No I Minerals (mode %) GD-7A GD-7B Plagioclase 25 20 | Microdine 17 ■ I Orthoclase 17 10 I Biotite 15 26 Quartz 13 28 Epidote 8 1 Molla Belay neh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Volume 4 - Annex 4 F Feasibility Study of Baro 1 & 2 Multipurpose Project Page 8-6 8.3.2 Geology of the Genji Dam Site General The Genji Dam Axis is situated at N897175 and E744750 (dam axis centre). The Dam Axis generally trends East-West joining a relatively narrow valley of the Genji River having fairly steep banks and lying at about 1200m elevation. Lithology The Genji dam site is underlain by Precambrian crystalline rocks which are unconformably overlain by horizontal, tertiary basalt flow. The Precambrian basement rocks comprise of interlayered biotite, hornblende- biotite and biotite-quartzofeldspathic gneisses, locally migmatized and banded. The basalt is vesicular, porphyritic with large phenocrysts of plagioclase. Much of the dam site except the Genji river course are covered by residual soil and dense forest. In these areas rock exposure is scarce. Intercalated Biotite, Hornblende-Biotite and Biotite- Quarzofeldspathic Gneisses, Locally Migmatized and Banded (pcgnd The Genji Dam Site is underlain by centimeter to 100cm scale interlayering of biotite gneiss homblende-biotitite gneiss and biotite- quartzofeldspathic gneiss. They are continuously well exposed along the Genji River course. Outside the river course, on both sides of the river, rock exposure is extremely rare, mainly on account of extensive development of residual laterite soil and dense forest cover. The rocks are fresh to faintly weathered, strongly foliated, thinly layered on mm scale, light gray, pink to white medium grained, in places migmatised and banded. They are more probably Paragneisses. The layering is possibly primary sedimentary origin. Some of the gneisses are cut by numerous sub-concordant lenses of granite and pegmatitic material. Discordant dykes and pods of granite and pegmatite are also common. Thin section and petrography analysis is given in Table 8.2 above. Plagioclase-phyric basalt flows (Ba) in the Western and Eastern flanks of the dam site the Precambrian rocks mentioned before are unconformably overlain above about 1300 meters by distinctive vesicular, plagioclase porphyritic, horizontal, light gray basalt flows, that have a preserved thickness of a few tens of meters (10-30) meters. In outcrops the rock is slightly weathered, vesicular, and porphyritic with large phenocrysts of plagioclase. Its age and correlation is not known. It is 300 meters lower than the plateau flood basalt found to the south and north of the project area and is assumed to be younger. It is later eroded to few meters depth. Thin section and petrography analysis is given in Table 7.3 above. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 8-5 Stereographic plots are given in Annex 3. There is a predominantly NW-SE structural trend and moderate dips towards SW in the entire Genji Project Area. The stereographic net plot gives an average dip and dip direction of 26° and 260° respectively. Stereographic plots are given in Annex 6 at the end of this report. Lineaments Joints The Genji Hydropower Project Area is traversed by numerous prominent lineaments. They range in dimension from a few meters to several meters and trend dominantly to NW -SE and NE - SW. The Genji river course itself is a North-South to NW-SE trending remarkable linear feature. Most of the lineaments possibly represent faults, but could not by ascertained on the ground due to mainly back of exposures owing to residual soil and heavy forest cover. The Precambrian successions are cut by several joints sets. The dominant joint sets trend 215 SW 275 NW and 300 NW and are very widely spaced (> 2m apart), tight and the dip is nearly vertical, ranging from (85-90)°. In places closely spaced joints occur trending 20° NE and 30° NE and dipping 35° NW and 90° respectively. Other closely spaced joints trend 260° SW and dip vertically. Other tight widely spaced joints trend (250-260)° SW and dip (70-85)° NW, 290° NW, 295° NW is vertical. Other tight, widely spaced joints trend 250°-260° SW, and dip 70°-85° NW. Joints trending 290NW- 295NW, dip 85° SW. Joints trending 325NW-315NW dip 80°-85° SW. Still other tight, moderately spaced joints dip 80-85° SW. Still other tight, moderately spaced joints trend 275° NW-35O0 NW and dip nearly vertical. The stereographic net plot gives an average dip and dip direction of 87° and 23° respectively. Stereographic plots are given in Annex 6 at the end of this report. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume A - Annex 4 F Page 8-8 nearly vertical. Joints including stereo net projection are presented in Annex 7 at the end of this Report. Headrace Tunnel and Power Intake The power intake will be located in biotite, hornblende-biotite and biotite-quartzofeldsphatic gneiss (Pcgn^. The headrace tunnel will also be located in biotite, hornblende-biotite and biotite- quartzofeldsphatic gneiss (Pcgni). The dominant rock types are fresh to slightly weathered, strongly foliated, light gray to pink-white and medium grained. Some of the gneisses are migmatitic, cut by numerous sub-concordant lenses of granitic and pegmatitic material. Discordant dykes and pods of pegmatite and granite also occur. The rocks are stratified on 5cm to 100cm scale and are probably paragneisses still retaining the primary sedimentary features. An adit tunnel for the headrace tunnel can be driven from a portal on a right tributary of the Baro River at UTM coordinates E0743780 and N0900570 downstream of the Genji confluence. The rocks here are (Pcgni). There are rock exposures which are covered with thin soil at places as observed from distance. It was attempted to visit the spot during the second fieldwork, but was found impossible due to elephant grass cover, dangerous steep cliffs and the onset of heavy rains. The adit tunnel can possibly be aligned to avoid lineaments. The dominant foliation trend is NW with a dip to the SW. The rocks are also cut by several joint systems. The dominant joint sets trend 215 SW, 275 NW and 300 NW and are very widely spaced (> 2m apart), tight and the dip is nearly vertical, ranging from (85-90)°. In places closely spaced joints occur trending 20° NE and 30° NE and dipping 35° NW and 90° respectively. Other closely spaced joints trend 260° SW and dip vertically. There are also tight, widely spaced joints trending (250-260)° SW and dip (70-85)° NW. Still other tight, widely spaced joints trend 250°-260° SW, and dip 70°-85° NW. Joints trending (290-295)NW, dip 85° SW. There are also Joints trending (315-325)NW and dipping 80°-85° SW. Still other tight, moderately spaced joints dip 80-85° SW. Still other tight, moderately spaced joints trend (275°-350°)NW and dip nearly vertical. Stereographic plots are given in Annex-6 at the end of this report. The present tunnel alignment which is on the right bank of the Genji River is crossed by the lineaments listed in Table 8-2 below. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 8-7 Residua! soil The gneissic rocks described above, are covered by residual soil outside the Genji River course where fresh to slightly weathered rocks are exposed. Similarly the basalts overlying them are also covered by residual soil derived from the weathering of the basalts. In general there is no colluvial soil due to the thick vegetation cover preventing transport of soil. Structure Foliation Lineaments Joints The dominant foliation trend is NW with a dip to the SW. The dip angle is moderate. There are apparently no lineaments in the Genji Dam site area. There are moderately spaced joints trending 275° NW-35O0 NW and dipping nearly vertical. The stereographic net plot gives an average dip and dip direction of 85° and 197° respectively. Stereographic plots are given in Annex 6 at the end of this report. 8.3.3 Construction Material Construction materials for the Genji hydropower Scheme will be from the same sources as the Baro2 Hydropower Project as thev ’ 8.3.4 are reasonably close to each other. Engineering Geological Considerations Dam and Diversion J 3®1'1 ?! be , al "ver '^l near the center on sightly weathered to.fresh .intercalated biotite, hornblende-biotite and biotite-quartzofeMsphatic gneiss (Pcgn,) The Diversion will be located ,n fresh to slightly weathered (Pcgn,). Foundation depths will vary on type of dam selected. H Apparently there are no lineaments In the Genji Dam site area The srgS^xa joint sets trend 215 SW 275 &V p rwe. “ spaced (> 2m apart) and the dip is nearly vertical There are moderately spaced joints trending 275° NW-35O NW and doping 0 M0,,a B®^^®^*^viengesha~feferra• Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Bare 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 9-1 9 REFERENCES • ARDCO and GEOSERV 1994: Survey and Analysis of the Upper Baro-Akobo Basin, Ethiopian Valleys Development Authority, Addis Ababa, Ethiopia. • Davidson, A., 1983: Omo River Project, Precambrian Geology and Geochemistry of parts of llubabor, Kefa, Gamo Gofa and Sidamo, Omo River Project, Ethiopia-Canada International Development Agency, Bull. No.2, Addis Ababa, Ethiopia. • GEODEV-AFREDS, 1999: Geology and mineral Resources of Oromia Economic Study Project Office, Addis Ababa, Ethiopia. • GEODEV-AFREDS, 1999: Oromia National Regional State, 1 : 1,000,000 Scale, Oromia Econmoic Study Project Office, Addis Ababa, Ethiopia. • Kazmin, V; 1971: Precambrian of Ethiopia, Nature, Physical Science, V.230 (16), PP 176-177. • Norplan-Norconsult, 1999: Prefeasibility Study of Baro Hydropower project, BA1 and BA2, Vol. 4 Ministry of Water Resources, Addis Ababa, Ethiopia. • Kazmin, V; 1972 : Geological Map of Ethiopia (scale 1:2000000) and explanotary note to the Geological of Ethiopia, Geological Survey of Ethiopia, Ministry of Mines and Energy, Addis Abeba, Ethiopia. • Kazmin, V; 1975b: The Precambrian of Ethiopia and some aspects of the Gology of the Mozambique Belt, Geophysical Observatory, Addis Ababa, V.15, PP 27-43. • Kazmin, V., Alemu Shiferaw and Tilahun Balcha, 1978: The Ethiopian Basement Stratigraphy and Possible Manner of Evolution, Geol. Rund., 67 (2), pp 531-546. • Kazmin, V., Alemu Shiferaw, Mengesha Teferra, Seife M. Berhe and Senbeto Chewaka, 1979: Precambrian Structure and Metallurgy of Western Ethiopia, Annal, Geol. Survey of Egypt,9, DD 1-1R Mengesha Teferra, Tadiwos Cherinet and workineh Haro, 1996 : Geological Map of Ethiopia, 1:2,000,000 Scale, 2nd ed. and its Explanatory Note, Ethiopian Institute of Geological Surveys (EIGS), Ministry of Mines and Energy, Addis Ababa, Ethiopia. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Tunnel Volume 4 - Annex 4 F Page 8-9 .. Table Nc I Approximate Distance from Intake (m) Trend Angle with tunnel 1 NE A Acute 2 I 1500 East-West Near vertical 3 I 1910 NE Approximately 45° 4 I 2190 NE Near vertical 5 2390 NE Approximately 45° 6 2620 NE Approximately 45° 7 2740 NE Approximately 45° 9, 8 2940 NE Approximately 45° 3220 East - west Approximately 160° The rocks would generally be strong. However some areas crossed by structures (lineaments, joints and foliation) will need rock bolting, shotcreeting, grouting and even rib supporting and concrete lining if the lineaments are faults filled with weak material. Powerhouse The Genji hydropower Scheme uses the same powerhouse as the Baro2 Hydropower Project powerhouse described above. Tailrace Tunnel and Tailrace Tunnel Outlet The Genji hydropower Scheme uses the same Tailrace tunnel and tailrace tunnel outlet as the Baro2 Hydropower project described above. Conclusion and Recommendation Generally the Genji Hydropower project can be said to have sound foundations for the dam and appurtenant structures being located in Precambrian gneisses (Pcgn,) which are migmatised and also banded. Tunneling conditions will also be generally good being located in various types of gneisses (Pcgn,) which have good to very qood rock mass strengths. The gneisses are locally migmatized and have pods of granites. Molla Be^ynehand Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Annex Geology 1: Barol Geological Maps and Sections i. Geological Map of Barol Dam Axis Area Volume 4-Annex 4 F Page 9-3 © ii, Geological Section of Barol Dam Axis Area iii, Geological Map of Barol Tunnel Alignment iv, Geological Section of Barol Tunnel Alignment Annex Geology 2: Baro2 Geological Maps and Sections i, Geological Map of Baro2 Dam Axis Area ii, Geological Section of Baro2 Dam Axis Area iii, Geological Map of Baro2 Tunnel Alignment iv, Geological Section of Baro2 Tunnel Alignment Annex Geology 3: Genji Geological Maps and Sections i. Geological Map of Genji Dam Axis Area ii. Geological Section of Genji Dam Axis Area iii, Geological Map of Genji Tunnel Alignment with Bare 2 iv, Geological Section of Genji Tunnel Alignment Annex Geology 4: Barol Structures Annex Geology 5: Baro2 Structures Annex Geology 6: Genji Structures Annex Geology 7: Petrographic Analysis Results Annex Geology 8: Photos Annex Geology 9: Description of Field Observation Points Barol, Baro2 & Genji Geological Mapping Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 9-2 • Mengesha Teferra and Seife M. Berhe1987: Geology of Gore Map Sheet( Nc36 -16), 1 : 250,000 scale, Ethiopian Institute of Geological Surveys (EIGS), Addis Ababa, Ethiopia. • Winkler, H., 1974: Petrogenessis of Metamorphic Rocks (3rd edition), Springer - Verlag, New York, pp312-316. Molla Belayneh and Mengesha TeferraFederal Democratic Republic of Ethiopia — Ministry of Water Resources Feasibility Study of Bare 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 9-4 Annex Geology 1: Barol Geological Maps and SectionsLEGEND Alluvial depoats. sand. alt and day Residual Soil Cover Cbcr- . I Apprt | Chtck INFERRED WEAKNESS ZONES Zona warn <5 m Zone Width 5 -10 m Zone Width > 10m t Oraw l Oct* |t„v* MINISTRY OF WATER RESOURCES feasibility study of the baro multipurpose project BARO 1 MPP PROJECT AREA GEOLOGICAL MAP Data drawn Sian. 2S.MJZ00* Gfl Kirassj Aeplacaa- fee (HO NORPLAN A.S Norconsult ♦> Drovtnj t* Bal-EOl tX. ****■' I 2681 ---------------------1490 ■_> i46o S^z^Vzs"-^. •>>g<>g^g<sgogogox^ 1440 .. — Z>ZV- zk'AVZV-^ZV- ZV-ZV^zv- Residual Soil cover, assumed thickness Banded Gneisses Weathered parts of parent rocks, assumed thickness Exploratory bore holes Zone Width <_ 5 m Zone Width 5- 10 m Zone Width _>10m I I f*er* MINISTRY OF WATER RESOURCES FEASIBILITY STUDY OF THE BARO MULTIPURPOSE PROJECT BARO 1 MPP GEOLOGICAL SECTION ALONG DAM AXIS as NORPLAN A.S Norconsult ♦♦♦ xi Dote frevn nmno* Sate checked Do*e oofz lento bepCecea lor Bore hole outside Q of dam 7K pniai no POIei Mtn Veil florae* I HOt SW AdOe Abeko O0« W.». NORWAY CthtoM NORWAY FrledberotretroTe >B 0 - jn¥ Bod VIM 6tftHANY Droving m Ba1-E03 Project no.- 2681H-METRES 0 150 300 450 600 750m LEGEND V -METRES 0 37.5 75 11Z5 150 187.5m Residual Soil Cover, assumed thickness Banded Mlgmatitic Gneisses INFERRED WEAKNESS ZONES I Zone Width < 5 m II Zone Width 5 -10 m HI Zone Width > 10 m MINISTRY OF WATER RESOURCES FEASIBILITY STUDY OF THE BARO MULTIPURPOSE PROJECT Oat. 2SM»M Sit. cbnktJ OH BARO 1 MPP GEOLOGICAL SECTION ALONG WATERWAY iJ. w Sale fr---------- GJ] NORPLAN A.S Norconsult XI $££5^ 7M FOB.. MOI Vtittbrtet I FrMMro.r.lr.7« 17) ■* lnd«. Ba1-E04 | "" 2681 7K ----------------------- ---------------------------------------- Ah i© Federal Democratic Republic of Ethiopia - Ministry of Water Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 9-5 Annex Geology 2: Baro2 Geological Maps and Sections Molla Belayneh and Mengesha TeferraBa2-E01 | 268]----- ( 1 MM 1 r~ i j Id i Potential Rock LEGEND Alluvium: day silt and sand Residual Soli cover Plagioclase Phyric-basait flows v v v - Indicates exposed rock Late -post tectonic granite Amphibolite, metadiorite, metagabbro and metahomblendrte Biotite orthogneiss, minor biotite gneiss Intercalated biotite hornblende biotite and biotite qu feldspathic,gneisses locally migmaeUzed SYMBOLS |—u | Precambrian exposures | | Dip strike of foliation Exploratory bore holes -------- ---- lAaw-xL Ichty l INFERRED WEAKNESS TRY OF WATER RESOURCES -vTY STUDY OF THE HARO HYDROPOWER PROJECT 0«t» Orown 2S.M70M Zone Width <.5 m Zone Width 5 -10 m Zone Width > 10 m ) 2/GENJI MPP PROJECT AREA 'GICAL MAP Sat* dwtk»d tsmsF" “•‘•AS SHOWN heptaim. ♦RPLANA.S Norconsult Oevtng i* ntes Bo2-E01 ttHtpta N00WAY GCTMAMT Hwjtct | 2681LEGEND Plagioclase Phyric-basait flows v v v - Indicates exposed rock Intercalated biotite hornblende biotite and biotite quartz feldspaihic,gneisses locally migmaelized and banded SYMBOLS Precambrian exposures Dip strike of foliation • B2D-2 Exploratory bore holes INFERRED WEAKNESS ZONES-£!£?«»1 Ipcrtf. 1 MINISTRY OF WATER RESOURCES feasibility study of baro multipurpose project Do'« drawn KMTOO* Jan ctwOtd & BARO 2 MPP DAM AREA ; GEOLOGICAL MAP (into a»«r.— -c» ““•AS SHOWN Aaplctr*. lor, ' rcn norplAN A.S Norconsult<* (£U «***T Orawtag r* Kj,. Bo2-E02 | Prejatt aa.i 26811330 1320 ,3,0O 1300 1290 1280 1270 1260 0 100 200 300 400 500 LEGEND Al Alluvium day silt and sand Residual Soil cover Plagioclase Phyric basalt flows Biotite orthogneiss, minor biotite gneiss Weathered parts of parent rocks INFERRED WEAKNESS ZONES I Zone Width < 5 m II Zone Width 5-10 m III Zone Width > 10 m T I r” nr«« I Do** l»m. B2D1 “ Data wr" 'T77 GIG Exploratory boreholes i BARoT^rW GE0L0GlCAL_^----r^7hS^ jSZlL ejnorp^ uuoi oi Mlmi ” pS* -------------- NOWWAY --- - ---- --------Federal Democratic Republic of Ethiopia - Ministry of Waler Resources Feasibility Study of Baro 1 & 2 Multipurpose Project Volume 4 - Annex 4 F Page 9-6 Annex Geology 3: Genji Geological Maps and Sections Molla Belayneh and Mengesha TeferraAnnex Geology 4: Barol StructuresBare! Dam Site, Joint Data Plot N = 24 Axial r. » «o«2o(ie ,Bare 1 Tunnel alignment Joint data plot Dip and dip direction Average 1 ■ 88o/346o = 24 Axial ieAnnex Geology 5: Baro2 StructuresIEqual Area (Schmidt) Baro2 Tunnel Alignment Joint Average dip and dip direction « 1, M*/315* 2. ar/27r Equal Area (Schmidt) N-MBaro2 Dam site Joint data plot Average dip and dip direction = 88°/143 Equal Area (Schmidt) Equal Area (Schmidt) N » 37 »»«eeeonedip «"» dip direction- i<W Baro - 2 Tunnel Alignment / Foliation Baro - 2 Tunnel Alignment /Foliation ■ .................... ...... ...... ■Baro - 2 Dam Site / Foliation Average dip and dip direction = 12°/270‘ N = 18 Axial Equal Area (Schmidl) N-18 Axial PageMofMAnnex Geology 6: Genji Structures ^UotieDip end dip direction • 2C*/2S0* Ganji Damsite Foliation (Schmidt) Equal Area Axial N = 7 Ganji Damsite / Foliation Equal Area (Schmidt) N-7 Axial *»0«i4afieGanji Tunnel Alignmcnt/Foliation (Schmidt) Equal Area N — 7 AxialGanJI Oam 8lta joint data plot Avaraga dip and dip direction ■ 86*/187° N-18 Axial Axial N-18 Page 16 of 11> □ 3 XQ 0 rt> ©_ o’ 22 -J • • & *1 o ora *o >sr■*• nEthiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Orc Samples) DcpL/Proj: Private Sample No.________BA1-7__________ Rock Name: Epidole-plagioclase-quartz- orthoclase biotite schist_________________ , Hand specimen description:________ It shows well developed foliation. Originator NORPLAN Lab. No.6498/2005 T)at^SiibmIttcd^oT7o772OO? Request No.: 6450-2005PVT. Semple type: Rock Type of Analysis: Thin section preparation & petrographic analysis. Dark gray in color and fine io coarse-grained texture. content Abr. Mineral Mode % Grain Size Texture Biotite 25 Flaky Orthoclase 19 Hypidioblastic- Xenoblastic J Quartz 18 Xenoblastic Plagioclase 15 Hypidioblastic- Xenoblastic Epidote 10 Xenoblastic j Spbcne 6 Idioblast ic Microcline 5 Hypidioblastic- Xenoblastic Muscovite 1 Flaky Iron-oxide Opaque I Hypidioblastic- Xenoblastic Apatite Trace Idioblaslic Zircon Trace Idioblaslic I Textnres and Descriptive notes: Schistose texture .Xenoblastic orthoclase. Plagioclase, Xenoblastic quartz, flaky green biotite and--------- EEgpduoluotsehoswhowstronstgrponarag llpelaroral ienletaltorioni.eGnrtaatnuionlar .pGlagrianocluaslare anpdlaai orthoc^lalassccreanveadleord thneb. J- ------------------ recrysaliatwn.^gm miyrals are ilmenite and magnetite. Idioblaslic crystal sphenes are rim~t _____________ Trace ■ <1% Described by: Girma Asemu & Workdul G/K Checked by: Workeiul G/K Date Completed: 2/07/2005Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Orc Samples) Proj: k? No. BAM_________________ Name: iz- plagioclase-biolite- orthoclase schist 1 specimen description:_____________ uni grained texture. Originator. NORPLAN l.ab. No.6489/05 Date Submitted: 01/07/2005 Request No.: 6450-2005PVT. Sample type: Rock Type of Analysis: Thin section preparation & petrographic analysis. __________________________ While and black banding in color and very coarse io Mineral content Abr. Mineral Mode % Grain Size Texture ' Orthoclase 28 I lypkiioblastic- Xenoblastic Biotite 25 I'laky Plagioclase 24 llypidiobiastic- Xenoblastic Quartz 15 Xenoblastic Microcline 5 1 lypidioblastic Muscovite 2 Flaky Epidote 1 Xenoblastic Sphene Trace Idioblast ic Apatite Trace Idioplasmic Zircon Trace Idioplasmic lron-oxidc Opaque Trace Xenoblastic fextures and Descriptive notes: Schistose Tenure.___________________________________________ 4yp>d>oblastic- Xenoblastic plagioclase, orthoclase, quartz and flaky biotite exhibited well developed parallel alignment. Plagioclase and orthoclase along the cleavage and edge beginning to change to tine flaky muscovite. Plagioclase rccrystalizcd around the edge. Described by. Ginna Asemu A Workehil G/K Checked by: Workelul G/K Date Completed: 09/07/2005 2Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) leptJPruj: Private Sample No. Rock Name: BA2-10 (TngTnator: NORPLAN Lab. No.: 6480/05 Date Submitted: 01/07/2005 Request No.:6450-2005PVT. Sample type: Rock Sphene-plagioclase-biotitc-feldspar schist Hand specimen description: Type of Analysis: Thin section preparation & petrographic analysis.______________________ Gray in color medium-fine grained in texture. Abr. Mineral Mode % Grain Size Texture Orthoclase Microcline 25 Xenoblast ic Biotite 20 Platy Plagioclase 17 Xcnoblastic Quartz 15 Xenoblaslic Sphene 10 Idioblastic- Xcnoblastic Iron-oxide Opaque 7 Idioblastic- Xenoblaslic Muscovite 3 Platy Zircon 1 Idioblastic Chlorite 1 Platy Apatite 1 Idioblastic —I —i Textures and Descriptive notes: Schistose texture. ______________________________________________ Granular xcnoblastic K-feldspar CM i croc line and orthoclase), quartz and idioblastic- xrnobhstic_____ sphene crystals strained to the schistose plane. Crystals of biotite show parallel orientation. Perthite texture is clearly visible on the K-feldspars. Minor biotite replaced by muscovite. In some parts of the section biotite developed between sphere crystals. Described by: Ginna Asemu & Workehil G/K Checked by: Workeiul G/K Date Completed: 10/7/2005 ^Bifboratory HeadEthiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DcptJProj: Private Originator. NORPLAN Date Submitted: 01/07/2005 Request No.: 6450-2005PVT. Sample No. BA1-12 Lab. No.6483/2005 Sample type: Rock Rock Name: Plagioclase-quanz-orthoclasc-biolite schist Type of Analysis: Thin section preparation & petrographicanalysis. Hand specimen description: Dark gray in cohr and fine - coarse grained in texture. It shows well-developed foliation. Mineral content Abr. Mineral Mode % Grain Size Texture Biotite 24 Flaky Orthoclase 23 Hypidioblastic- Xcnoblastic Quartz 19 Xenoblast ic Plagioclase 18 Hypidioblastic- Xcnoblastic Epidote 7 Xenoblast ic Muscovite 5 Flaky Sphene 4 Idioblastic- hypidioblastic Apatite Trace Idioblast ic lron-oxidc Opaque Trace Xcnoblastic 1 r ✓» r r ( _______________ Textures and Descriptive notes: Schistose Texture Hypidiohlastic- Xcnoblastic orthoclase. Plagioclase. Xcnoblastic quartz and flaky green biotite had developed preferred parallel orientation .Granular plagioclase and orthoclase replaced On the grain boundaries to line muscovite. Sphene crystals rime ilmenite grains. Trace *= <1% L Described by: Ciirma Asemu & WorkchilG/K becked by: Workelul G/K Date Completed: 2/07/2005 4Ethiopian Geological Survey Mineralogy &. Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Private Sample No. BA2-20A___________________ Rock Name: Sphenc-plagioclasc-biotite-k-feidspar schist Hand specimen description:______________________ grained in texture. Originator: NORPLAN Lab. No.: 6482/2005 Date Submitted: 01/07/2005 Request No.:6450-2005PVT. Sample type: Rock Type of Analysis: Thin section preparation & petrographic analysis._________________________ Black with white spot in color, coarse -medium Mineral content Abr. Mineral Mode % Grain Size Texture Orthoclase Microcline 30 Xenoblastic J Biotite 20 Platy Plagioclase 15 Xenoblastic Quartz 12 Xenoblastic I Sphene 12 Idioblastic-Hypidioblastic •] Lron-oxidc Opaque 7 Xenoblastic Muscovite 3 Platy Apatite 1 Id io blastic Chlorite Trace Tiny flaky Calcite Trace Xenoblastic 1 Zircon Trace Id ioblast ic In some nartR of th* u——■** ’— Textures and Descriptive notes: schistose Texture. Well-developed parallel alignment is observed in all minerals. Granular grains quartz and sphene strained to the schistose plane. Some grains of ilmenite partially rimed by sphene crystals. In some pansof the section plagioclase replaced by biotite, cdchc and musc^hZ - -................................. LFcscnoeu ny: utrma Ascmu & Workelul G/K Checked by: Workelul G/K Date Completed: 10/7/2005 _________ LaboraibryllcadEthiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) OeptJProJT^ Private Originator: NORPLAN Date Submitted: 01/07/2005 Request No.: 6450-2005PVT. Sample No. BA 2-19 Lab. No.: 6481/2005 Sample type: Rock j Rock Name: Mon-biot he granite pegmatite Type or Analysis: Thin seaion preparation & petrographic analysis. Hand specimen description: Pale pinkish while w’ith black spots in color and very coarse to medium grained texture Mineral content Abr. Mineral Mode % Grain Size Texture Ortlx>clasc Microcline 35 Hypidioblast ic- X enoblast ic I Quartz 24 Xenoblast ic Plagioclase 20 Xenoblast ic Biotite 14 Platy Chlorite 2 Platy Muscovite 2 Flaky Sphene 2 Xenoblast ic Iron-oxidc Opaque 1 Xenoblaslic Zircon Trace Idioblast ic Apatite Trace Hypidioblastic f r Z’ \ \ L / i Textures and Descriptive notes: Schistose texture._________________________________________________ Some of the k-feldspar started break down to tiny flaky mica (muscovite). Platy crystals of biotite show parallel alignment to the schistose plane of the section. Minor crystals of biotile change to chlorite. Perthite texture is observed on the section. Described by: Ginna & Workelul G/K Checked by: Workelul G K Date Completed: 9/07/2005 Laboratory Head 6Ethiopian Geological Survey Mineralogy & Petrography Laboratory Pelrographical Data (Rock and Ore Samples) 1 >cpuTruj: Mvaie Originator: NORPLAN Date Submitted: 01/07/2(JofT Request No.: 6450-200SPVT. 1 Sample No B A2-35 . Stock Name: Plafnoclase-quartz hornblende- biolite schist Lab. No.: 6485/05 Sample type: Rock j Type of Analysis: Ihin section preparation & petrographic analysis. j 1 Hand specimen description: Gray in color and medium grained in texture ij Abr. Mineral Mode % Grain Size Texture / Biotite 30 Flaky Hornblende 23 Xcnoblastic Quartz 20 Xenoblast ic Plagioclase 18 Hypidioblastic- Xcnoblastic Orthoclase 4 Hypidioblastic- Xcnoblastic * Epidote 2 Xcnoblastic lron-oxide Opaque 2 Xcnoblastic 3 Sphene 1 ldioblastic Muscovite Trace Flaky Apatite I—— ZAZ r Trace ldioblastic 1 --- zj r----------- Talura and Descriptive notes: S ch Lit ox tenure. Xcnobtoic quartz, hornblende, hypidioblaslic- xcnoblastic plagioclase and flaky biotite exhibited well developed parallel alignment . ldioblastic sphene is rirmd by ilmenite. Opaque mmerate are ilmenite, hematite and magnetite.______________ Docribed by: Gi & Worked G/K Checked by: Workelul G/K Date Completed: 03/07/2005 riidrW] end 9Ethiopian Geological Survey Miacralogy & Petrography Laboratory Petrographical Data (Rock and Ore Sample*) beptJ^ruj: Prtwtf Originator: NORPLAN Rrqoat No.:M5»-1005PVT. Sample No. BAI-Jl Lab. No.: 64845)5 Sample type: Rock Rock Naw. S'ntecw-ptafiwctoe-qtnru buMrtr what Type of Anah’tto: Thin section preparation & petrographic anohsh Iliad specimen dwriplma Dark gray in color and coarse grain texture. Mineral cod teat Abr. Mineral Mode % Grain Size Texture Biotite 28 Flaky Quartz 24 Bypidiobtatic- XciwbhrfK Phgkictac 20 HypidioNaslic- XcnohhstK Sphene to IdkihtasiK Hornblende 5 XctwhUstic Orthoclase 8 Hypidiobhsik- Xenoblast ie Fpidoic 2 Xcnobhstic Ironoxide Opaque 2 Idtobhsta:- Xenoblasts Muxxnfto 1 Flaky .Apatite trace Idioblast ic f f 1 L 1 Tntaro aad Iharripthe notes: Schistoic Texture.____________________________________________________ Hyp*hnhiaflr- XcnohtasU quanz, phgioda.se, Oaky biouxe and idioblasuc sphene revealed_______________ groqg »cbato«n. Opaque nuncrah arc Orncmu, bcnnint and magnetite. Ilmenite b rimed__________ _ _____ H sphere ft__________________________ 8Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Orc Samples) DcptJl’roj: Private Sample No. BA2-47 Rock Name: Porphyritic basalt_________ Hand specimen description: Originator: NORPLAN SLabam. Nplo.6488/ e type:2005 Rock Date Submitted: 01/07/2005 Request No.:6450-2005PVT. Type of Analysis: Thin section preparation & petrographic analysis.______________ _ ____________________________ Dark gray in color and fine-coarse grained in texture______ Mineral content Abr. Mineral Mode % Grain Size Texture Plagioclase 46 Anhcdral-subhedral Pyroxene 38 Anhedral Iron-oxide opaque 14 Anhedral volcanic Glass 2 calcite trace Anhedral r “I 1— Textures and Descriptive notes: porphyritic Texture. Phcnocrsis of plagioclase (labradorite and bytownite) grains are seen tn the fine grained groundmass of plagioclases and intergranular pyroxenes. Some of the grains of nlagiocln^, nnd Pyroxene are coated by iron-oxide. The cavities filled with calcite and iron -oxide Trace «<l% Described by: Girina Ascmu & Workclul G/K becked by: Workelul G/K Date Completed: 02/07/2005Ethiopian Geological Survey Mineralogy & Petrography Laboratory Pctrographical Data (Rock and Orc Samples) 10Ethiopian Geological Survey Mineralogy & Petrography Laboratory Pctrographical Data (Rock and Ore Samples) icpt/Proj: Private Sample No. BA2-5IB___________________ Originator: NORPLAN Lab. No.: 6491/05 TJat^SntjrnittcdroT7(i77200? Request No.:6450-2005PVT. Semple type- Rock Rock Name: Quartz- plagioclase -hornblende schist Type of Analysis: Thin section preparation & Hand ipecimcn description: grained in texture. petrographic analysis. Dark gray with black spot in color and medium to coarse Abr. Mineral Mode % Grain Size Texture Hornblende 56 Xcnoblastic Plagioclase 20 Hypidioblast io Xenoblastic Quartz 10 Hypidioblastio Xcnoblastic ; Iron-oxide Opaque 5 Hypidioblastio Xenoblastic Chlorite 5 Fibrous Epidote 4 Xcnoblastic ‘ Apatite Trace Idiobiastic Muscovite Trace Flaky Biotile Trace r Flaky 1 P1 ) 1 Teitnres and Descriptive notea: Poikiloblastic texture. Porphyroblastic hornblende encloses quartz, plagioclase and apatite, Hypidioblastio Xcnoblastic plagioclase, quartz and Xcnoblastic hornblende have parallel alignment. Biotite crystallized along the edge and inside ilmenite grains.p .X Described by: Girma AsemuzsJ-A A Workelul G/K <ZZV Checked by: Workclul G/K Date Completed: 09/07/2005 Head *Ethiopian Geological Survey Mineralogy A Petrography Laboratory Petrographical Data (Rock and Ore Samples) OcpL/Proj: Mvatc sample No. BA2-51A___________________ Kock Name: ^aartx-plagioclaie- hornblende ichiit Hand specimen description:_____________ grained in texture. Originator: NORPLAN I jib. No.: 6490/05 Date Submitted: 01/07/2005 Request No.:6450-2005PVT- Samp... le type: Rock Type of Analysis: Thin section preparation & petrographic analysis. _______________________________ Dark gray with black spot in color and medium to coarse Mineral content Abr. Mineral Mode % Grain Size Texture Hornblende 34 Xenoblastic Plagioclase 33 I lypidioblastic- Xenoblastic Quartz 15 Hypidioblastic- Xenoblastic Iron-oxide Opaque 8 ldioblastic* Xenoblastic Epidote 5 Xenoblastic Chlorite 5 Fibrous Apatite Trace ldioblastic 1 re*-------- A p x-------------------------------- \ Textures and Descriptive notes: Poikiloblastic texture.__________________________________________ Porphyroblastic hornblende enclose in quartz and plagioclase crystals, Xenoblastic hornblende, Hyp idio blastic- xenoblastic plagioclase and quartz show parallel alignment. Some gram* of hornblende are replaced b}’chlorite.zx — - 1 Described by: Girina Ascmu-nA-x &WorkclulG/K 75---------------- \--------------------------------------- Checked by: XVorkdul G/K. Date Completed: 03/07/2005 12Ethiopian Geological Survey Mineralogy & Petrography Laboratory Pctrograpbical Data (Rock and Ore Samples) DcptJProj: Private Originator NORPLAN Request No.:MS0-2005PVT. 1 Sample No BA2-52B . Rock Name: Rutile- sphcne-actinolrte-homblendc schist Lab. No.: 6493/2005 Sample type: Rock Type of Analysis: Thin section preparation & >| petrographic analysis. ---------1 Hand specimen description: Grwnich black in color, coarse-medium grained Texture. Abr. Mineral Mode % Grain Size Texture | Hornblende 37 Id'ioblastic Actinolite 25 Acicular > Sphene 10 Xenoblastic Plagioclase 8 Xenoblastic ' Rutile 6 Hypidioblastic Chlorite 5 Platy Biotite 3 • Platy Epidote 3 Xenoblastic Iron-oxide Opaque 2 Xenoblastic ? Calcite 1 Xenoblastic £— _____ I f 1 l T~r --- 1 Textures and Descriptive notes: Schistose texture. Jjornblcndc and ^inoliu crystals rimed as chain like by sphene cryslah Mono th,ir JtWrte «nd chlonte have preferable orientation. Granulated large crystals of - Described by: Girma Asemu A Workelul G/K Checked by: Workelul G/K Date Completed: 10/07/2005Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DcpL/Proj: Private Sample No. BA2-52A Rock Name: Talc-chlorite-tremolite schist. Hand specimen description: 6riginator: NORPLAN Lab. No.: 6492/2005 Date Submitted: 01/07/2005 Request No.:6450-2005PVT. Sample type: Rock Type of Analy sis: Thin section preparation & petrographic analysis._______________________________________ _______ Dark green in color, medium -coarse-grained texture. Mineral content Abr. Mineral Mode % Grain Size Texture Tremolite 40 Relict Chlorite 20 Platy i Talc 18 Hypidioblastic Iron -oxide Opaque 12 Idioblast ic-xenoblaslic Apatite Trace I lypidioblastic-xenoblastic (' f £ ___________ Textures and Descriptive notes: Schistose texture._______________________________ __________ _____ Rebel tremolite is completely replaced by chlorite and talc crystals. Most of the minerals specially tak and chlorite show parallel alignment. Idioblastic to xenoblastic iron-oxide (magnetite) as porphyroblast in schistose ground mass of tremolite,chlorite and talc. Described by: Girma Asemu, & Workelul G/K 'Checked by: Workelul G/K Date Completed: 9/07/2005 14■ Ethiopian Geological Survey Mineralogy & Petrography Laboratory Pctrographical Data (Rock and Ore Samples) Private Sample No. Rock Name: Epidotc-ptegiociase-biotite-quartz schist Hand specimen description: Originator NORPLAN Lab. No.: 6494/2005 Date Submitted: 01/07/2005 Request No.: 6450-2005PVT. Sample type: Rock Type of Analysis: Thin section preparation & petrographic analysis.____________________________ Dark gray in color and medium grained texture. Minerali content Abr. Mineral Mode % Grain Size Texture 5 Quartz 46 Xenoblastic-hypidioblastic ; Biotite 25 Flaky Epidote 10 Xenoblastic Plagioclase 10 Hypidioblastic Muscovite 5 Flaky (’ Sphene 2 Ilypidioblaslic-idioblastic Calcite 1 Xenoblastic Microcline I Xenoblastic Iron-axidc Opaque Trace Hypidioblastic --------- Z3 (■ r------------- n \ —L Textures and Descriptivc notes: Schistose Texture. Xenoblasnc-hypidiobtoic quartz, Hypidioblastic plagioclase, Xenoblastic Epidote and flaky ggecn orrm Rinfrte shnw oru-w} nnrolUl Biotite show good parallel alignment Some of the ___ .------------------------------------- r . plagioclases changed to calcite and epidote. < Granular quartz and plagioclase strongly strained. Epidote is rimed by Rinrirc ~: Trace *<1% Described by: Girina Asemu A Workclul G/K ---------------------- ----------------------------------- : 7" ------ Cheeked by: Workelul G/K Date Completed: 2/07/2005 -A *Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) Dept/Proj: Private Originator NORPLAN Request No.:6450-200SPVT. 1 Sample No. BA2-53 Lab.No.64R6/05 Sample type: Rock Rock Name: Quartz- sericite- epidote- actinolite- hornblende schist Type or Analysis: Thin section preparation & j petrographic analysis. | Hand specimen description: Greenish black in color, coarse to fine grained texture content Abr. Mineral Mode % Groin Size Texture £ Actinolite 1 lombicndc 22 Xenoblast ic-hypidiob!astic J Epidote 20 Xcnoblastic Muscovitc(Scrci!e) 20 Tiny flaky S Quartz 12 Xcnoblastic ■ Iron-oxidc Opaque 10 Id io blastic- Xcnoblastic Cldoritc 5 Platy Plagioclase 5 Xcnoblastic K-feldspar 5 Relict | Calcite I Xcnoblastic Apatite Trace Idioblaslic 1 f -1 L ~T^---------- r ~l Textures end Descriptive notesi\ Schistose texture. Xcnoblastic actinolite- hornblende, epidote and tiny flaky sericite show xsxdl developed___________ parallel alignment. Granular quartz strained to the schistose plane. K-feldspar and plagioclase are strongly scncitized and epidotized. Described by: Girma & Workciul G/K t Checked by: Workciul G/K Date Completed: 10/7/05 16Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Ore Samples) DepL/Proj: Private Sample No. GD-7A__________ Rock Name. Meta biotite granite pegmatite Hand specimen description: grained in texture. Originator NORPLAN Lab. No.: 6496/05 Dale Submitted: 01/07/2005 Request No.:6450-2005PVT. Sample type: Rock Type of Analysis: Thin section preparation & petrographic analysis. ________________________________________ — Block and white bonding in color, very coarse-medium Mineral content Abr. Mineral Mode % Grain Size Texture | Plagioclase 25 Xcnoblastic ? Microcline 17 Xcnoblastic Orthoclase 17 Xcnoblastic Biotite 15 Platy J Quartz 13 Xcnoblastic p Epidote 8 Xenoblaslic Muscovite 2 Platy *i Chlorite 1 platy 1 Zircon 1 Idioblastic Calcite 1 Xcnoblastic Sphene Trace Xcnoblastic Textures and Descriptive notes: Schistose Texture. Xenobiaaic orthocte, microcline, plagioclase and flaky biotite show parallel nlionnynt ffig”*** « otovcd on K-fcldsptr. Antiperthite texture is clearly visible on plagiocl Curved twin lamella of plagioclase is also seen due to defotmation. — Described by: Girma A Workclul G/K : Workclul G/K Date Completed: 10/7/05Ethiopian Geological Survey Mineralogy & Petrography Laboratory Petrographical Data (Rock and Orc Samples) cpt./Proj: rivaic ample No. BA2«63________________ _____ Lock Name; irthodasc- biotite- plagioclase-microcline chist______ __________________ _ _______ land specimen description:_______________ radium grained texture. Originator. NORPLAN Lab. No.; 6495/05 ThU^uEmitted: 01/07/2005 Request No.: 6450-2005PVT. Sample type: Rock Type of Analysis: Thin section preparation & petrographic analysis. Light gray with black spot in color and coarse to Mineral content Abr. Mineral Mode % Grain Size Texture Microcline 28 Xcnoblastic ; Plagioclase 20 Hypidioblastic- Xcnoblastic Orthoclase 18 Hypidioblastic- Xcnoblastic Biotite 15 Flaky Quartz 10 Hypidioblastic- Xcnoblastic Muscovite (Semite) 5 Flaky Iron-oxide Opaque 2 Idioblastic- Xcnoblastic Sphene 1 Idioblastic Chlorite 1 Fibrous Calcite Trace Xcnoblastic Apatite Trace Idioblastic J Textures and Descriptive notes: Schistose texture._____________________________ _______________ Hypklioblaslic- xenoblastic quartz, plagioclase, xcnoblastic microcline and flaky biotile show parallel alignment. Some of the grains of plagioclase and k-feldspar strongly changed to Seri cite and calcite. Some of the biotite grains started to change to chlorite. Described by: Gimm Ascthu & Workelul G/K Checked by: Workelul G/K Date Completed: 09/07/2005 Laboratory Head 18Annex Geology 8: PhotosEthiopian Geological Survey Mineralogy & Petrography Laboratory Pctrographical Data (Rock and Ore Samples) DepL/Proj: Private Originator: NORPLAN Date Submitted: 01/07/2005 Request No.: 6450-2005PVT. j Sample No. GD-7B Lab. No.: 6497/05 Sample type: Rock Kock Name: Homblendc-plagioclase- notile-quartz schist Type of Analysis: Thin section preparation & petrographic 1 analysis. ! Hand specimen description: Black and gray in color and coarse-grained texture. It shows foliation. Mineral content Abr. Mineral Mode % Grain Size Texture j1 Quartz 28 Xenoblastic-hypidioWastic | Biotite 26 Flaky Plagioclase 20 Hypidioblastic > Hornblende 15 Xenoblastic-hypidioblastic Orthoclase 10 Xenoblaslic-hypidioblastic ? Epidote 1 Xenoblast ic Calcite Trace Xcnoblastic j Apatite Trace Id io blastic i Opaque Trace Xcnoblastic ; Muscovite Truce Flaky A —I— A f .z Textures and Descriptive notea: Schistose Texture._____________________________________________ Hypidioblastic- xenoblastic quartz, hornblende, hypidioblastic plagioclase, and flaky biotite, have strong parallel alignment. Plagioclase and orthoclase grains are replaced by calcite and fine flaky Muscovite. Described by: Ginna Asemu^y &Worfce!ulG/K ^Cheeked by: WorkclulG/K Date Completed: 03/07/2005 _______________ .^.Laboratory Head ✓€ J - (? ‘ V vxy/// 20Photo No.3, Migmatitic Biotite Gneiss with concordant and discordant pegm materials at UTM746417E, 900882N Photo No4, Left side of Baro River, plagioclase phyric basalt unconformably overlying map unit Pcgn2 3Photo No. 1, Overview of part of Baro2 tunnel alignment taken from UTM 746751 E, 9015550 N looking South. Note Jejebe settlement in the foreground. 2Photo No.8 Rock exposures along Bare River bank (biotite and hornblende Biotite gneisses) looking East from UTM 740848E. 902018N 5Photo No. 5, Overview of suggested quarry site for Baro2 looking SE from UTM 74675 IE, 90155ON Photo No. 6. Overview of Baro2 Access tunnel to powerhouse and tailrace adit tunnel area. looking upstream taken from the hill NE of borehole B2T-6 4Photo No. 11, overview of Baro River course, looking downstream from UTM 739376E, 902523N, near tailrace tunnel adit portal sit UTM 736520E^'903250NPStrearn °f ta‘lraCe tunnel outlet looking south fromNc-9. dtese up of P5xo No. 8 Photo No. 10, rock exposures along Baro river, note waterfall in the background taken looking upstream from UTM 739376E, 902523N, near tailrace tunnel adit portal site 6Photo No. 15, Rock exposures along Baro River bank (biotite and hornblende Biotite gneisses) looking East from UTM 740848E, 902018N 9Photo No. 13, tailrace outlet site of Baro2, facing south from UTM 735959E, 904076N rock exposures are covered due to rise of water level due to the rainy season Photo No. 14. overview of Baro2 tailrace outlet site 8Annex Geology 9, Description of Field Observation Points BARQ2, BARO1 & GENJI Geological MappingDescription of Field Observation Points BARO2. BAR01 & GENJI Cod* Rock type Main chractertatlea Strike Dip Strike )lp Coo .oiting rdinatari Jorthing 7477399 698214 1 BA2-1 AJueaan 0uft»owr> atty day mdyvetay(twemp) 2 BA2-2 B-oda OrOognama wtacrpcweddongrtver bed. kghl gray «era* paned. a*s#*y wtuhead. moderaWy to widely icrniad, cut by pegmeMa dytae *3 35oW J70oW WOoNW f50N fOONE 747574 898027 3 BA2-3 Brcdte Ornognaia* Conswody expoaed along over bad (dabbyl ak^gy weathered. coarea grained. gray, wat ttatad. vary wtdaty Jointed D30cNE to NW 2S0oSW 270 W JOO NW 75o SE Ko 00 sw 747B74 *98110 4 8A2-4 ftotta Orthognewe Smafl aipoaiae (3x10m) In dry vatay (twemp) lai tymg. white. MgMy waaftarad. coarae graced totaled. widely yotnted, cut by quartz vdna. OOOo OOo MOoNW 4OoNE OOo Mo 74*421 *9777* 5 BA2 5 Plafpodaaa Boddary axpoatf* not eontnoua. dong dope, modarataty waafiered. tght grey, highly porphyr* «ati tar ga phenooydx of ptagtodaea. 74*590 •97728 20 1 20m expoaura tn dry valey (ewamp) tat lymg (hcnzoradj cut by net wort ofbartta apdoc vedna. moderated weatiered. vtda totaled OOOo 00a 748836 897474 ^-tioyniw 7 BA2-7 OrTwgneea Smet expcema al tot lying. moderately woattert coarae gramed, totaled 355o NW IOoSW 747310 090210 BA2-8 &ott» Onhogieae Flat lymg amefl expoaure. homogeneoua. moderately waatrnred, fcjfit grey, coare grained, totaled 747102 898134 • BA2-9 tea* Ortoogrmaa River bed erpoaur* (daby) moderately weathered. v*ta. ooarae grwad. homogeneoue. totaled 310 NW 08oSW 747003 898014 10 BA2-10 BroMeGrwaa Wat expoeed dong mar bad (daby). atr^dy weathered, grey, median grained, wet totaled, watety fomted 355o NW ioosw 260oSW 005oNE 295o NW 300ONW Mo OOo 90o 90o 746962 897996 11 BA2-11 Brctto (MNfMlM Wat axpoaad atong river bed. ab^ty weetoerad. •**». totadd. homogeneoua 746*11 898198 12 BA2-12 Bota OrTnyiata Wet expoaed along rarer courae aa large date. •W weatoared whae coarw grained, dronjyy deformed, wet totaled, cut by net wort of jonta (very ctoady yonterf) 34 Do NW 05oSW 305oNW OlOoNE 87oSW &5oNW 747044 897841 Pfrync large boUdery erpoaurt (lm3-10m3). moder Maty weathered. btfn grey, imiini. hrgtty porphynac. phanocryda of large ptegtodaaa. vedotar 74739 897913Main characteristic Folia tion/Banding Joint* Strike Coordinate ra Dip Strike (Dip 32 Elating jNorthina 748192 748438 747570 737453 903170 737178 737030 737130 903154 I BA2-J9 Hon’Mend* BA2-*0 A *>"9noNi 737045 270-NV 350" NW 295* NW 74M18 740314 897048 I?' ma. WSW 902440 P "»4«eF 1 i r 1 '1 I B — “?-------- 1-------- i I------ 8 F 3 " V---------- i i i rr ? r~ Xr r 1 T I i - i I ? 1 i I “T” 2 I r» kyhH h ue If UBl mi H I P 1 H? bv IH n IH H IHh H lb* S 8£ s t« i hs m a! ? i 1 1 L I 1 $ h? I! * g { 1 lI! 1 |1i II i ? 1 2 i 1f i i» f II hh M{is hI I1I1! II I 1 ill fljui ii Him lh5 nil 11 I n III! i1h! ill 0iilh HI di h H II ill ih h fj H 1 H n su Hl hl Uli 11 h Ith hi?K Hill !1 I I j 111 1 ih 11 h ii 3 3 3 Hl ll|h in liilii hi llj ni !ill lill S 111 d l «4 1 I 1 Eh iht h8 hl 5? ■S—3 a» s 3 1$ J3 s s S 3 I 4 3 a 3 5 8 8 8 8 3 & 8 3 38 3 3 a Si 8 J5Serii Code Roc* type Main characteristic Foliition/Ba riding Strike >ip Strike )ip E Coo •sating h rdimtar* orthing No. 320 NW »°SW 65 BK2-4-* cut by gratz veers, v*ry widely joWed J4(fNW ?WNW 325NW W w w 747284 898061 M BA2-66 PtepOCteM Phynctaaak Boydary expoare. oyiby weathered. bgre pey. vmkuUi. porphyrite. contaxw •tandem rod hduaana. tape tefcfopa Mngt, exposure 67 BA2-87 Beta* urrognwta anal exposure tn 4x8m in dry vide valey. •tydy westtered. vMt to pink co«e pasted. 34OoNW 06*sw 745777 a BA2-M Plat ort>gnwM Dry stream expoaura, sbyrty weathered, pink to nw rniad totaled. expoama • 3x4 m 015*f€ 25*NW 745551 899590 a BA2-68 Banded bote* hteTtfande Expcaire along le# bank of dry akaam 10x25m, li^ey weavwod. grey. «*»• graced, totaled, banded, vadefy jointed. cut by guartz 05°NE 26°NW 252°SW 90* 90* 745524 899500 70 BA2-70 Botta Hornblende Gnrnr On tank of dry axtream(lx2m). moderately weathered, grey medum pawed, wet totaled 745411 899465 71 BA2-71 pbymcima Large botedary expoaura. almon al contact between baaemani rocks and basal low. tl^tay weathered. StfM grey, porphyrite, vesokar 745291 899294 72 BA2-72 Ptepodaae Poddery expoaoa around al iwconfomity. stghOy weathered, bght per. vaatoutar, porphynac 745244 899032 73 BA2-73 745172 899271 phyricbM*! 74 BA2-74 PtopoctaM phyrictmal Botedary exposure pattern around at contact between taaal and gneraa atgMy weathered. by»t pay, vaaicutar porphynac 744780 899505 75 BA2-75 PtopotoK phyrfctaaak Bouidery exposure pattern, eighty weathered, bytt grey. veskxkar. porphyritic, with ptanocrywa of poipodaaa and magnetite 748335 898086 70 BA2-76 phync basal Botedery exposure pattern, *ii{^>ty weadwred, bQhl pay, vesicular. porpyntic, large phenocrysts ptepoctosa 748260 898197 1 Tt BA2-77 LatertocSta No reck axponre. black colon tap act. reddah brawn tot. typeai of taaafl waaVtaring product 747931 898543 78 BA2-78 Ubpnetac bua.gndw Top of ridge expoaura la 20x1 Om. Otfrtfy weetwred. grey, medum grimed *M concordant pandc materta cut acroae by pegmatite dykes, very widely jointed. wte exposed, tunnel 74667! 899550 78 BA2-79 Boat* mctagranta Top of ridge exposes 20x60m leash. pink coarse grained, deformed, very wtady jointed, f*^°nctxx>y 345*NN wsw 2«rsw SCfSE 74664 899782 n BA2-80 Roddudaol No rock expoaue. top block cotton to* covered by ateptert great devetopad on ____________________________________ 74112 9022435 Bl BA2-81 •nd twat* Scattered stope exposure. eighty westered. inter4ayared. whrte. bp* pay. fne to wedun pawed, wet totaled, headng to Bare River 2SCNE 40NW 74110- 902326 B BA7-82 eSflhfly weathered. iyn grey, tne to medum grained, wet totaled. Hope expoaure, th* ad cover, headng to Bare Rkrer to check •dt to power house 20*NE StfNW 74108- 902274 3 BA2-63 Bloat, gnaw dope exposure. abj/ity waattered. bye pay. bne to medum paced, wH fotated 05*NE tfw< 741044 » 9902187 4 8A2-84 Bc«t* and wet expoaod along river course. eighty waattered. grey, dark pay. medum grained, wot fotated. wah Iota of eptorta - cut by pegmafoa dykaa N-8 57-W 225*SW 271TN Wnw 80°N 74084 902018 1 3A2-85 Bodtepwea Stope expoeure. skpafy weetoered. pay. medum greeted, wet fotated, tadaty jointed N-S «Av 4CTNE 25*SW 74103 902186Soria No. Rock typo Main characteristic FoHa tiortBa ndtng Jomta Coortfinatere No. Strike Op Strike Op Exrebng Northmg 117 8 AM tended Onotoe 9tf«y weetoerod. wrtte to Igrt **y. comm gramt toyored. eonto xncordartpegnaMedytae and port Mt common, modereiefy fenced 35*NE 10*MN 20*hE NON* 2BQNW 75*SE K*Mrt ■0*mw 73*313 Mi4*0 111 8 AM Mm Exposure on back rtm part, of contoamio oxpeeure along rtoar bad. now wider wafer cover. rt^rOy weefeered. kgM to dart prey, scarce gratis*. wH Mated wtoi rtunrtart pegnaOte and grantee TMortato concordant and decor dart to far Mabe M he hart rock (mgne*fc gnctoa) □ooefy jointed CM 53Vf >45*AW 20*»C 305*NW WNE BX ro*wf 73*113 6616M lit 3A1-7 9kM(M Canbnoue apeoura atang nttet bad. coWd nd reach due to ■ncrwaea of water levar Rtoer bank aepoewo elgMy weathered, dart gey, coame gamed, and grantto material teS 35*W 737112 **1H3 120 BAM LMUkScI Near Bore hot* 8A1-0 4 ne cart etpoeww, dart brown, reafeuai eel darteed tom banded sneer 121 BAM Urw«c5o4 Exposed near teat bort fate BAI-05, »0d to dart brown wBh gjartx grim, no reck expeowo encowiterod. TMS12 M13OS 122 BA1-10 UnertiteSo* AM e tew meoere tomberrtote BA1-D4, mad 04 eipoaure of ma^dert. buff brown wtthtotoef quartz gramt.1 meter tolrt. 75*612 6*130* 123 BA-11 BoM&wn amad dry e»tem exposure (2 x3 a* moderately mattered. print ho gey. c«rM gramed. wMh loto of pegmctelo material, widely joirtad cf 0* xxt'mcv M 7W«C 0*111* 124 BA1-12 BkXMgwtee On toe Eton J ol toe Baro Rhrer croeemg to tot Bank, etgbOy weathered, dart gey. medulm gened, dowefy jointed, wok totaled wtto kito ol pegmate and gentle nwtaneto. concordent otth too Maben ol toe encteeing heat rock. 35*N£ f*W» 205 SW ixr» 73*Mnr 75*350 •612*0 125 BA1-13 MMgrante On toft bank of Boro RMr.alghtey we« oxpceod, rtwafy jointed 3W*MW MX 4C*»C S4MM 750SW nrsw nj*M* •era 7VW 7u*mw 75*367 ••119* 126 BA1-1 UgmrtcGnetoe Obcrveteneteng loft bonk «rB*o Rhmr. Ugtoy weemered. coarie gwnod. urongy rrngnaOaed. abundant pognotoe end ganbe muriate perakei to Mefton. wfeoiy jointed 1O*K XOdrt 3S3*Nrt 27U*Wf W «*» 71*10 •*122* ir r BA1-1 rtgnetocGnteM •od rntUgrrm Nong teft bonk of Boro Rteer. needy rt exposure* are under water, dm bonk erpoeure of teghfty waotoert. coerva gwed. ctroogly rngmetoad wCh olxmdant ptgnwftte dytae. grwrte tenue end paw berte bearing mtuto locktog, "wtogerdte. rtxxkettoy fenced end wMexpoeea toong (tew c*une. 200*5* 0WV isertaw tp*ow •r* rs»ttz Ml2*lCoordinate* Eating Northing 744 74 7 744887 I215SW |W 90* I310NW po* 29ONW I300NW l 205 oW 74 5278 yrsw 75*NW 74 5378 240® SW 160* GW 7MW4 ■nt***I - !THE FEDERAL DEMOCRATIC REPUBLIC OF ETHIOPIA MINISTRY OF WATER RESOURCES BARO MULTIPURPOSE PROJECT FEASIBILITY STUDY Final Report Annex 4 G Seismic Hazard Assessment at Baro Dam Site Geophysical Observatory, Science Faculty, Addis Ababa University September 2006INTRODUCTION This document providing seismic hazard assessment for the Baro dam site is based on the earthquake catalogue of the Geophysical Observatory which extends back to 800 AD The catalogue is based on the work of Gouin fl979), Shah (1982), Asfaw (1986) and Anibraseys and Adams (1986, 1992), The widely accepted methodology for seismic hazard assessment is mainly due to Cornell (1968). A computer program implementing the method of Cornell has been developed by several workers, most notably by McGuire (1976, 1993). lhe program has been revised continuously accommodating new developments in strong ground motion attenuation The international group organized to develop a Global Seismic Hazard Assessment Program (GSHAP: Basham and Giardini, 1993) has recommended this method as lhe standard lor seismic hazard evaluation. The first seismic hazard assessment for Ethiopia was made by Gouin (1976) and site specific hazard assessments have been made for numerous project in the country from 1978 to 1991. The method utilized then was that of estimating return periods of different intensity levels including maximum credible intensity using lhe extreme value distribution method of Gumbel (1954). Since 1991 both the seismic zoning map (Kebede and Asfaw, 1996) and routine site specific hazard assessments have been made for strong ground motion involving acceleration and pseudo-velocities for different frequencies This is essentially evaluation of spectral hazard. In the current hazard evaluation both spectral hazard for strong ground motion and hazard m terms of Modified Mercalli Intensity Scale are given. SUMMARY OF THE .METHOD The probabilistic method for seismic hazard assessment of Cornell (1968) is employed. This is given by the total probability theorem in the form H(a) =• 22, v, J f P[A>a| m, r]/Ml (m)/R((Mt (r | m) dr dm where the hazard H(a) is the annual rate of earthquakes that produce a ground motion amplitude A higher than a. A could be peak ground acceleration, or velocity or displacement or it could be spectral pseudo-acceleration for given frequencies. The integration in the equation is earned out over individual area sources and this is summed 2 t'SEISMIC HAZARD ASSESSMENT FOR A DAM SITE ON BARO RIVER geophysical observatory ADDIS ABEBA UNIVERSITY NOVEMBER 19981' EARTHQUAK_E HAZARD (POLYGONS)INPUT 1. EARTHQUAKE SOURCE ZONES In employing the method of Cornell (1968) as applied by McGuire (1976, 1993) The choice of areal source is the appropriate one for the region. This is because faults which are characterized in detail through detailed mapping, measurement of slip rate, rupture length and depth of energy release are none existent in the East African region in general and in Ethiopia in particular Earthquake records (Gouin. 1979). quaternary faults, plate tectonic consideration (Kebedc, 1989, Asfaw, 1992) and other tectonic signatures including active volcanic centers have been utilized to delineate source areas of earthquake hazard by polygons. Almost all earthquake destruction in Ethiopia has been due to earthquakes originating in these source areas shown in the Figure next page 2. CHARACTERIZATION OF THE SEISMICITY OF SOURCE ZONES The b value which is a fundamental input characterizing the seismicity of a give source is defined by Gutenberg and Richter (1954) as Log N (m) = a + b m where N (m) is the cumulative numbers of earthquakes with magnitude m and ahnvo in 3Peak Ground Acceleration (g) 0 00D1 Llower and upper magnitudes (Mmm, » 3. STRONG GROUND MOTION ATTENUATION The frequency dependent strong ground motion attenuation has been given in a variety of forms Previously that due to Joyner and Boore (1988) and Boore, Joyner and Fumal (1903, 1097) have been used in the evaluation of spectral hazard. In the current hazard assessment two additional attenuation relation for strong ground motion due to Idriss and Campbell are included for comparison. For example the frequency dependent strong ground motion due to Boore. Joyner and Fumal (1997) far the random horizontal component is given in the form; log Y - bj • bi (Mw - 6) J bi (Mw - 6 ) J bq r +b> log r + b$ Gb + b? Gc where Y is given as a fraction of gravity acceleration (g), Mw is the moment magnitude of the earthquake (Hanks, 1979). r is related to the distance. In this relation the coefficients b: are frequency dependent and corresponding analysis using these coefficients for different frequency (period) give spectral hazard estimates. This relation is developed largely based on Californian data Gb and Ge correspond to type of faulting The tectonics in Ethiopia is of the extensional variety (Kebede el. al. , 1989 , Asfaw, 1992) and the depth of earthquake focus which controls strong ground motion is shallow and similar to that in California. In the absence of strong ground motion attenuation for the East African region this relation has been widely used. In particular the work of Spudich et.al (1996) validates the use of similar relation in regions with extensional tectonics as we have in Ethiopia Furthermore, since 1976 Californian ground motion attenuation initially for intensity and later for acceleration and velocity have been used to prepare seismic hazard maps for Ethiopia and make site specific hazard assessments The following three figures show attenuation for peak ground acceleration (PGA) Tor magnitude 5 6 and 7 as given by Idriss, Boore-Joyner-Fumal, and Campbell and Bozorgma Based on the foregoing explanation the attenuation relation adopted for Ethiopia is dial of Boore. Joyner and Fumal (1993). 4. ATTENUATION OF INTENSITY (MMI SCALE) 1 Anothei important parameter for earthquake hazard assessment is the intensity of around mouon as characterized by intensity of damage during an earthquake Initially. Gouri! 4Peak Ground Acceleration (g. ! 1I1fJ AT rUNUATlON EQUATIONS. PGA M - 7 0 ldriw (1993) — Boore-Joyner-i'umal (1993) Campbcll/Bozorgnia (1993) IPeak Ground Acceleration z .. . --------------------------------- TV 1 ATTENUATION EQUATIONS, PGA, M = 6.0 Idnss (1993) Boore-Joyner-Fumal (1993) Campbell/Bozorgnia (1993) s 0.01 \Annual Frequency of Exceedence(1976) applied a mean of Western and Eastern North American curves for use m assessing earthquake damaec in Ethiopia. Since this work of Gouin data on records of earthqua e damaee in Ethiopia, which have been accumulating over the years have been‘ «se^ derive a mean attenuation relation for the Hom of Afnca region (Asfaw, 1986). This relaiion is given in the form I = 2.15 - 2.43 LogR + 1.55 M where I is the Modified Mercalli Intensity (MM1S), R is the epicentral distance and M is the local magnitude and is the same as the moment magnitude for M < 6.5 The current hazard assessment gives Intensities in MMIS for various return periods for the site in question A catalogue of earthquakes that occurred from 1900 to 1995 within 200 kilometers is also included RESULTS In the following Peak Ground Acceleration and Spectral Acceleration at 5% damping for horizontal components are gve for different return periods and frequencies for the Baro dam site located at 8.057° N , 35.354° E (UTM coordinates: 759500 Easting, 891200 Northing) The values are for hard rock site RETURN PERIOD 1 1 0HZ 5.0 HZ 10.0 HZ PEAK GROUND ACCELERATION i 100 YEAR 03 5g .060g 039g 040g 200 YEAR ■0718 045g ,046ft 500 YEAR 054R .O84g ,054g ,054g 100 YEAR ■065g ■097g 06 062g 5000 YEAR 094g I24g •08 Ig 282g Values arc £iven as fraction of g (gravitational acceleration) For example. .01 g = l%g= 9 81 cm/secx I lazard details of the spectral acceleration and peak ground acceleration are shown in the following four Figures. 5Annual Frequency of Exceedence TOTAL HAZARD BARO DAM SITE, 10 Hz Idriss (1993) Boore-Joyner-Fumal (1993) Campbell (1993) 1e-10 !e-20 1 e-3002-91 Annual Frequency of Exceedence «> + i TOTAL HAZARD BARO DAM SITE, 5 Hzintensity results CATALOGUE OF EARTHQUAKES FROM 1900 TO 1995 WITHIN km OF THE BARO DAM SITE. 6Annual Frequency of Exceedence TOTAL HAZARD BARO DAM SITE PEAK GROUND ACCELERATION (PGA) 1e+10 Idriss (1993) Boore-Joyner-Fumal (1993) Campbell/Bozorgnia (1993) 1e-20Joyner, W. B and D. M. Boore, 1988 Measurement, Characterization and Prediction of Strong Ground Motion. Reprinted from Earthquake Engineering and Soil Dynamics II, 1- 60. Kebede, F . W. V Kim and O. Kulhanek, 1989 Dynamic Source Parameters of the March-May 1969 Serdo Earthquake Sequence in Central Afar, Ethiopia, Deduced from Teleseismic Body Waves. JGR, 94 B5, 5603-5614. Kebede, F. and O. Kulhanek, 1994. Spatial and Temporal Variation of b-values /Mong the Bast African Rift System and the Southern Red Sea Phys, Earth. Planet Int 83 249- 264 McGuire. R K.» 1976. Evaluation of Earthquake Risk to Site. Us Dept of Interior, Geol. Survey, Open File Report 76-67, 69pp. McGuire. R K . 1993 Computation of Seismic Hazard. Ann. Di Geofisica, 36: 3-4, 181- 200 Shah, E„ 1986. Seismicity of Kenya. PhD. Thesis. Seismological Dept Univ of Uppsala and Phys. Dept. Univ, of Kenya. 282 pp. Spudich, P.» J B. Fletcher, M. Helweg, J. Boatwright, C. Sullivan, W. B. Joyner. T C I tanks, D. M_ Boore, A. McGarr, L. M. Baker, and A G Lindh, 1996 Earthquake Ground Motion in Extensional Tectonic Regimes. U. S Dept of Int., Gcol Survey. Open File Report 96-92, 352pp,references Ambraseys. N.N and R D. Adams. W» SeismleUy of Sudan Bull Seism. Sos. Am. 76: 483-493. and R D. Adams, 1992. Reappraisal of Major African Earthquakes, Ambraseys, N N i------------- ■- South of20’H 1900-1930, Tectonophysics , 209. 293-296 Asfew I. M .1986 Catalogue of Ethiopian Earthquakes, Earthquake parameters. Strain Release and Seismic Risk. Proceeding of the SAREC - ESTC Conference on Research. Development and Current Research Activities in Ethiopia (in G/ Woldcycs Edit.). Addis Abeba, 252-279 Asfaw, L M , J 992 Constraining the African Pole of Rotation. Tectonophysics, 209’ 55-63 Ayele, A . 1998. Seismicity and Earthquake Source Mechanism Study in the East African Rift Ph D. Dissertation, Uppsal Univ. Faculty of Science and Technology Basham, P and D. Giardini, 1993 Technical Guidelines for Global Seismic Hazard Assessment. Ann. Di Geoftsica, 36. 3-4, 15-24. Boore, D NT, W. B. Joyner and T Fumal. 1993. Estimation of Response spectra and Peak Acceleration. US Geol. Survey, Open File Report 93-509, 72pp. Boore, D M., \V. B Joyner and T E Fumal, 1997. Empirical Near Source Attenuation Relationship for Horizontal and Vertical Components of Peak Ground Acceleration. Peak Ground Velocity and Pseudo Absolute Acceleration Response Spectra. Seismo Res Leu 66 I. 154-179 Cornell, C. A.. 1968 Engineering Seismic Risk Analysis. Bull. Seismo Soc Am 18 1583-1606 Gouin, P . 1976. Seismic Zoning in Ethiopia. Bull Geophys. Obs Addis Abeba, 17: 1-46 Gouin, P , 1979 Earthquake History of Ethiopia and the Horn of Africa. International Development Research Center (1DRC), Ottawa, Canada, 258 pp. Gumbe!, E J 1954 Statistical Theory of Extreme Values and Some Practical Applications US Dept of Commerce. Applied Maths Series 33. 51pp. Gutenberg, B and Richter, C. F.. 1954. Seismicity of the Earth Phenomena 2nd ed Princeton Univ, Princeton. New Jersey, 310pp. and Associated Hanks. T C.. 1979. A Moment Magnitude Scale JGR, 84 2348-2350i**
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