njo.m-iz Ministry of Mines, Energy and Water Resources Land and Water Studies Agency BIRETE DAM PROJECT SPECIFICATIONS AND BILL OF QUANTITIES ADDIS ABABA May 1981Ace- iGt, Ministry 0C Jfinsa, Energy and Water I? o 10 lu'c e & Land and Water Studies Afi?rtty BIRETE DAM FROJECT SPECIFICATIONS AND BILL OF QUANTITIES ADDIS ABABA MAY 1981 ■1 ABSTRACT The report contains s poclf icati on* for the construction of Birete 13am Project* It includes payment clauses* The specifications and the payment clauses have been tied with the items of the Bill of Quantities# and the Bill of Quantities have boon The specifications compiled in a way that thia document can form a part of the contract if th» work la ldt out on contract.li ACKNOWLEDGEMENT Specifications have been based en the standards of Water and Power Du vq Id frffl.cn t Authority and National Engino aring Services, Pakistan, incorporating modi floatione and Changes to suit the local site conditions* Bill of Quantities have boon worked out toy Ato Banteyahun HailOj engineer LWSA and Mr* Simon de Haan, Associate Export, UNDP, NAFIS AHMAD UN ENGINEERING ADVISER ■i±±i TABLE OF CONTENTS Item ABSTRACT.. . . ■ *■*i■■ ■■■ a ACKMOi/LE’XiLKENT ■ i TABLE OF CONTENTS ■ SPECIFICATIONS 9 *"*• Fa ft* . i . il lit SECTION ii ■i -p A* - C| E, Envitonin.t.mHI Pre t c t i on Ifobiliintion for Project Construction Oivaraion and Caro of U&tur during Construction, Excavation Construction of Earth and Rockfill - ConcretG) Plain and Rainforced ii “G* Miscellanooua BILL OF QUANTITIES3IRETE DAh PROJECT SPECIFICATIONS SECTION A ENVIRONMENTAL PAOT^gTIGN LANDSCAPE PRESERVATION The Contractor shall take due precautions to preserve the natural surrounflifigs and shsll carry out tils ccns-tru^ti on activities in such a manner as to avoid daniuRO to &r spoiling of the natural landscape around the area of the project. Clearing of trees bushes, vegetation grazing land, crops or 1 T f property shall be limit.nd to the areas of porniattent works, approved construction roads and the aroAs of excavation operations, On ccmplction of the project construct ion ell t work areas around the permanent structures shell bo cleared and graded so as to blend with the natural landscape. The camp arnri shall bn left in n clean condition and the abondoned borrow pita and quarry $ito$ shall bo dressed to stable slopes. PREVENTION OF VATER POLLUTION Tho Contractor shall carry out his construction activities in n manner that would prevent entrance cr accidental spillage of solid mat tor| contaminants, objectionable pallutmts, wastes, refuse, garbage, sewage effluent, oil or other petroleum products into stream, r DUST AdATI KENT During the construction of the project the contractor shall carry out proper and efficient measures wherever and whenever necessary to reduce the duet nuisance, KEA5UREKENTS AND PAYMENTS Tho cost or all work roquirad by thia section aboil bo included in tho prico bld in th* schedul* for other itocna of work.- 2 - SECTION B MOBILIZATION FOR PROJECT CONSTRUCTION I JQRK INCLUDED The work under this section consists of furnishing all plant, labour, oquipment, and superlntondsnec, and other aorvlc&s and facilities required to complptfl th.a Birote Dam Project. i MEJLSWtjSMENTS AND PAYMENTS B-2(1 ) General Thsi Contractor shall submit a breakdown of the lump sum price bid for It™ 101, Mobilization for Project Construction, to ths Engineer within thirty days of the date of award of Contract. Ths breakdown shall reflect in roasunailt detail aa detsrained by thu engineer, the coat of each Of the principal items of work ineludnd for payment under the contract Lump ruts price andj, subject to such revision as the Engineer may require, shall ba used as a basis for partial and final payment as the work under It urn 101 Mobilization, 1 for Project Construction, is performed and completedv 3-2(2) Mansur ament Measurement will be made of the mobilization of facilities for project construction nnd work related thereto, all as msntionod In cltyst 3—2(3) below, aa specified horounder ns a complete unit. B-2(3) Payment Payment will ba made for the unit newurtd as provided above at the Contract lump sun price for Mobilization for Project Construction, and shall constitute full cospansatian for providing: all facilities including camps, raaintenance and services required In connoction therewith as indieated, specified or otherwise required for ths proper operatian of the facilities and not included for payment under any other Contract Item. Payment under this Item will include but is not necessarily limited to, all cost* incurred in connection with providing quarter* for the Contractor's personnel}. Workshops, Warehouses, sheds and yardsj end the Contractor a administrative and field offices^ 13 SECTION C DIVMRSJON AND CAPE CV J ATE it DURING CONSTRUCTION 1 SCOPE 01(1) General Thia section covers the- c on&t rue t ion Eiaintenzincc f + nnd ths performance of nil work nee&aa ary to care for river water ground wnt^r and Local drainage in B t connection wi th the entire Contract, 30 thmt such water does not intorfora with the progress or affect tho quality of tho construction. 0-1(2) Work inducted Th. ci work includt’ft but is not Hid tod to tho following! (i) Diversion end earn of rivu-r during construction, (ii) Unwatering and henGling of vztar bohind Coffer* dans in conduit and all other parts of tho work. (ill} Such design as may bp necessary to supplement that shown on the Drawings and carry out the intent of this section* 0-1(3) Structures The structures include but are not United to r are Upstream and Downstreca Cofferdams, and ths Diversion R,C,C, Structure including inlctT conduit and outlet, Work in connection with each of these structures not covered in thia section shall be performed in accordtnee with the applicable requirements of tho various Sections of the Specifications for the par 11c ular wo rk invu1 red, -2 DIVERSION S :HEME C-2(l) General Tlk& Construction of darn will rs^uirs a diversion to pernlt preparation of foundation and placing af fill materials in dry, Hi Yer diversion will bo accompli shod by constructing the Upatreajn and Downstroam Goffordhraa, and diverting the river flows through the Diversion Structure, The Diversion la to be accomplished in two stages.u - a) Stage I* In the firat dry Beason, it is intended to construct, i) the Diversion structure, ii) the spillway, end lit) the Intake Structurs* iv) It is also intended to ainultiinooualy construct the dam from both sides to the full height leaving a gap in the b) embankment as shown in the Drawing to enable the high flows during the rainy season after the first dry season to pass. Stage II In the next dry season, it is intended to construct, 1) the lipstr van Cofferdam, 11} the Downstream Cofferdam, ill) the diversion of the river through the Diversion Structure, and iv) closing of the gap in the Main Dam continuing construction upto the full height* J CLEANING AND STRIPPING OF FOUNDATIONS All areas undar the Cofferdams, Diversion Structu.ro, Spillway, Intake Structure and the nain Das ahall be cleared.of treesvegetation and any other objectionable materials. Cleared material shall bo disposed of by the Contractor from the site of work in a waste area designated by the Engineer* 4 EXCAVATION FOR FOUNDATIONS Excavation for foundations of Cofferdsn, Diversion Structure, Spillwayp Intake Structure and the Main Data shall be carriod out in accordance with the Drawings and as specified in Section D-EXCAV/vTIQN* 5 COFFERDAMS C-j(l) Materials Materials for cofferdam fill shall bo obtained from required excavations or from borrow as selected by the Contractor and approved by the Engineer, The different zones of cofferdams shall be constructed with the material gradation as shown an the Drawing,5 Tho shell" of the tofrnrdans will bo constructed with random rockTlll obtained froa the excavation with c*zisu.-j size particle.!* not C-5(2) Placement and Compaction 25cs« The random rotkfiil in th® shells of th^ coffcreams shall be placed in J5 CD loojD-dcpth lifts *uid coupcc.cd with at Least Tour passes (cftnpUt* covers) of a 10 short ton vibratory roller. Th* impervious zone and the transition me.te-ric 1 fill in the Jpstre^E? -ol ■, , erdam a shall be placed and compacted in accordanto with rolevaE't clades of Section E for the Hain Lnporvlous and transition fills* C-5(3) Demolishing Downstream Cofferdam After tho construction of tho Hain Dae has boon completed* the lownstrotkra Cofferdam or blcU portions of this Coffordnc a-> directed by the En^inaor shall be dome11shod -nd the ciat^rial so damolishod shall bo dis posed of in tho aosiprinted spoil ar^ss ns directod by th® Engineer, APPROVAL OF COHTRACTCR■S PLAN Or OPBRaTICMS Within thirty days aftsr receipt of notice to proceed with the Contract# the Contractor shall submit his proposed plan of operations for all Rtage 1 and Stage JI works under this Section for approval of the Engineer# Includingi a) Description of method including layout of unvatorieg system for coffordamS| excavation areas s-nd other parts of ths f work . b} Dotalla including capacity of unwatering equipment# for unwatering cofferdams excavation ams and othur parts p t of th® work. 7 PROTECTION OF PErLKjJiEfrTT WC_itf The Contractor shall provide such qmm as jfs necessary to supplement the approved schemas for diversion* care of river# end unwatering during construction for the protection of the permanent work#6 UNWATERING AND CARE Or The Contractor shctll provide?, install, operate and maintain approved unvutoring ays tons (incl tiding sufficient standby equipment) to unwater and keep dry all areas of construction that are below the stream or ground water elevation during construction operations and as required to keep excavated foundation and underground areas and side slopes stable* An fill material shall be placed in the dry, C-9(1) Item No. 102, Rlv^r Diversion and Care of Water. a) M eas ur ement. Measurement will bo made of all work acceptably performed undtr this item, which is not included for payment under another Item, as a complete unit. b) Payment. Payment will bo rsndtj for the unit measured above at the Contract lump buei prico for River Diversion and Care of Water and shall constitute full compensation for all casta related to diversion and care of water and other water for which paycont is not mads under other including repair or replacement or damaged work due to flood and other waters, expense Incidental io overtopping of cofferdams, do watering, re-excavation and all othor work related to the it gib. ^"“9(2) Items No. 1OJ-a, lOU—a, and 201 Clearing and Stripping of Foundations. a) MeasurooGnt, Measurement will be made for the number of square taotres projected vertically to a horizontal plane of the foundations area acceptably cleared, stripped and graded. b) Payment. Payment will bo mad* for the number of square- metres a* □assured above for clawing, stripping and grading and shall constitute full compensation, for clearing, stripping and grading of all material7 related to this itam inciudinc disposal of stripped niEiterial In the approv&d spoil are?., C-9(3) Items No, 103-dF 103-Cp 104-bf ioi-c. Random Rockfill, Transition Material fill, and lapervious fill in Upstroam and Downstream Cofferdams. he a s ure mtn t Miiaaurer.iont undor thesa items will bo mad® by actual cioaouroriont mothod for the number of cubit metroa of oaoh material in place and acceptably in tho cofferdam fill to the linos, grade® and CrDs-Moctions shown on the Drawing or established by tho Englnoor, b) Payment, Payment will bo made for the number of cubic metres measured as provided above for the Contract unit price per ciubfc cctru for thc&n Hops, Payment shall constitute full compensation for constructing the cofferdam fills from required excavation, stock" piles and borrow areas including-err*vhtiau hauling . Ts rehandling, processing, moistening, piecing and compacting- the materials as specified and all other work related to the I teens. Item No, 105- OeQolishing of ^ownstroarj Cofferdam, a) Measurenont, Measurement will bo raade for the number of cubic meters of fill acceptably- demolished and removed from the Downstream Cofferdam as specified in clauea C»3(3)- b) Payment, Payment will be n&ade for the number of cubic metres of fill demolished from the D-ownatr^am Cofferdam ay measured above and shall constitute full compensation for excavation, demolishing, and disposal of excavated material in the approved areas and grading, leveling and clearing the Downs tram Cofferdam site in. an approved manner.8 C-9(5) IterD No, 106. Fumpinp of water fron Foundations. a) MeasurMient» Measurement will ** made fcr the number of 5 lltr#a per second per hour of water rooved (excluding watar supplied for construction purposes) from all work areas whenever required by puraping regardless of head against which it is puEipod, acceptably perforeedi and as a complete unit, Keaaurenient will be made by acceptable devices provided, by the Contractor and acceptable to the rYi^ineor, b) Payment«. Payment will bo niade for tha tiuobor of 5 litres per second per hour measured as above at the Contract unit price per 5 litres per second per hour for pumping of Water from foundations and shall constitute full compensation for the work related to pumping of water as described in clauses C*7 and C—8. SECTION D EXCAVATION 1 SCOPE This auction covers excavation for Cofferdam* Diversion t Structure, Spillway Intake Structure and the Main Dam; r borrow aroaa; dental excavation, other excavation not specified in other sections| ©nd disposal of all excavated materials except as the placement cf material la Covered in o t her a o c t i on s « '2 EDIFICATION QF EXCAVATION MATERIALS D-Z(l) General The terns Rock, Random Rock Formation and Earth # are Hereby defined when used for the purpose of classifying excavated materials for payment- under the various Items * D~2(2) Rock Rock shall raoan all in place beds or ledges of solid mineral natter sound and intact and as so classified by the Engineer. Processing and utilization of rock shall be required in the construction of the Main Darn.9 D-2 ( J) Random-Rock llandom Roek 9hall mean in placo solid mineral material weathered to a reasonable degree having pieces of rock sound and intact, and as 30 classified by the Engineer* 0*2(4) Transition Material (leathered Basalt). Formation. Formation of igneous material generally called rock but not meeting the classification requirements for Rock or Random Rock as in clauses D-2(2) and D—2(3) ros pcc t i ve-ly, and being in Such a wtathortd condition that it can be effectively loosened or broken by ripping, and os so classified by the Engineer- D-2(i) Earth Earth shall mean all materials except Rock, Random Rock and Formation as defined above in clauses D-2(2), 2-2(3), and l>-2(4), Earth shall include, but not nocnssarily bo limited to, all geologically recent materials overlying rock such as alluvium and talus; all layers of earth which art cemented so that the oftrth becomes conglomerate, shall be considered as Earth* D-3 EXCAVATION,OPEN CUT^-^GENERAL D-3(l) Excavation Methods The Contractor shall perform all open cut excavation and grading to the final elevation lines and grades shewn on the Drawings ar approved by the Engineer■ Excavation sh-T.ll bo performed by approved methods* The Contractor shall make such trial excavations as are necessary to Indicate the adequacy of the excavation methods. The rock excavation in the foundation area of structures shall done by such careful methods as Line Drilling Pre Splitting or Cushion Blasting* Tho Contractor shall plan hie excavation operations in the rock area in such n manner that the bulk of material produced la of (—) 30em sizo* The responsibility for thy sueccaa of the excavation method shall rest with the Contractor regardless of approval by the Engineer*10 In general for th© earth and quarried rock materials the Engineer will use hi.9 boat endeavours to advieo the Contractor at the loading areas regarding the suitability of excavated materials for u» in embankment based on the Engineer's oxaraination prior to transportation to points of plaCfiraOht nnd stock piling will not bo paid for, Rock oxcav.ation Itow the dan and other structures1 foundation Oren shall be stockpiled cs per instructions of the Engineer, The quality requirOniont,3 of tho materials are specified in cl&ui'B E — D*3(2) Excavation Extent B > Mot crisis i Excess excavation performed by the Contractor for any purpose or reason, except that ordered in writing by the Engineer, shall bo at the expense of the Contractor, All excavation for structures shall be carried to foundation material satisfactory to the Engineer regardless of whether the elevation thereof is higher or lower than the elevation shown on the Drawings, All necessary precautions shall he takun to prostrve the material toolav and beyond tbe linos of all excavation in touzid undisturbed conditions. All over excavations required by the Engineer to be backfilled shall bo backfillod by tho Contractor in accoroanco with the instructions of the Engineer| over-excavation in rock below or against concrete Structures and impervious fill shall be backfilled with concrete or as directed by th© Engineer} if over- axcavation is unauthorized it shall be backfilled at the Contractor s oxpenso. Except where the use of other material* is specifically approved by the Engineer unauthorized excessivt excavation, along 1 v the aides of structures In rock and in earth whero side forms are not used shall be backfilled with concrete at the Contractor *• expanse, Materials for uaa the work shall bo carefully excavated to produce the material in form suitable for the work| additional measures such as secondary bloating and mixing shall bo usod if necessary, to make tho t- 11 - excavfttod material suitable for the rnquir<?d usw* Excavations through overburden into rock ahull be perrormed in a manner to result in separation of th* rock from the overburden ao that th* maximum practicable amount of suitable ouibankAvnt and fill material will be produced* Stripping *f bushes, shrubs, t*paoil shall be done prior to start of excavations in the area, in accordance with clause C-3 hereof■ D—3(3) Excavation Tolerances Excavation shall be performed within th* tolerances Tor excavation Limits indicated on the Drawing*. Where no tolerances are indicated! excavation shall be performed to tolerances established by the Engineer as acceptable for the design and typo of work involved. In case where the structure or other governing; criterion permits, the Engineer may relax the tolerance to facilitate construction. 0-5(4) Excavation Line to Suit Field Conditions Th* character and desired dimensions of this proposed excavations ar* In general indicated an the Drawings* The. Engineer, however, shall have the right to 1 a) Vary the depth, width, and the length of the excavations and to increase or decrease the slop** including bdrms of the excavations; and b) Require the use of berms of dimension as instructed in permanent slopes where none are shown on the Drawings I if conditions require or permit such modi 1 iontions for the purpose of obtaining more stable or economical slopes and/or foundations* Thu Engineer shall have the right to vary the excavation linos after excavation has been commenced* Contact Excavation for Core beneath th* impervious core of the Main dam embankment within limit* as shown *n the Drawings all Earth materials shall bo excavated, rock surfaces shall bo prepared and impervious material shall be12 placed as roquir^ far the control of under-seepage, Excavation shall bo cnrriod to reasonably sound rock, suitable to receive the impervious core material. Contact length between the impervious core and rock at the Main Embankment Dam shall be as shown on the Drawings * The suitable material excavated will be allowed to bo placed in the shells of the main dam as directed by the Enginoer^. and the Contractor may stool pile such suitable material for further use.. The payment for placerasnt of suitable nnttrial will bo mad* separately according to other shell material in the dam, The unsuitable material will bo disposed of in the designated spoil area, and no additional payment will be rai.de for stockpiling and disposal work. D-3(5) DENTAL EXCAVATION Zones of unsatisfactory material below the foundation levels shown on the Drawing which will require excavation, ntay bo encountered. All such material., regardless of eharoctor, shall be removed and disposed of as directed by the Engineer, Dental excavation shall consist of ths rumoval of earth such as talus or alluvium or unsound rock such as soft, friable or highly weathered rock from holow the foundation or other base* excavation lines indicated on the Drawings or directed by the Engineer for Structures and for impervious earth—rock contact and f from locations such as joints, fissures*pockets and between rock beds, whore the use of power excavation equipment is not practicable. Dental excavation shall not includo removal of materials by pressure washing and shall not Include excavation which is classified by tho Engineer and paid for under another Contract Item* Excavated areas covered in this cluuso shall bu cleaned as specified and provided with dental treatment as specified in clause D-8(l)flD-J(6) Clearing anti Stripping for (juarriua The areas fjrofll which Rock, Random—Rock, Transition Material, and Earth is to be excavated Cor fill in the Dm, shall be cleared and Stripped of all bushaa , treOJi shrubs, top unsuitable soil or material as directed by the Engineer, Blasting and Excavation work in the quarries shall start only after th** stripping and clearing has been completed to the satisfaction, of the Engineer and the stripped surface has been approved by the Engineer, The stripped material shall be disposed of in the- waste areas as directed by the Engineer. D-3(7) Moasuremont and Payment The measurement and Payment for excavation shall be made according to the typo of excavation that is Bock or Random-iiock or Trnnsi t ion Matericl ( 1/*athsred Basalt) or Earth, qb classified in the field by the Engineer, Thu item rate for payment of Excavation shall include the disposition of material in the specified manlier . RCfCK_AUA BRIES D—4(1) General The material for rock-fill will be obtained from the approved Rock Quarries as indicated on th® Graving or as selected by the Contractor and approved by the Engineer, Th® Contractor shall exploit, develop and maintain the approved quarries and pit* in a suitable condition for th® extraction and raniovul of the required materials in a manner satisfactory to the Engineer, so aa to obtain at all tlm®* the greatest practicable yield of suitable material* in th® deposit, The fact that the Employer has approved th® site and location from which material for rack-fill may be obtained shall not be construed as constituting the approval for ua® of all raatorinl extracted from the quarries and tho Contractor shall be responsible foi th® spedflad quality and grading of such produced matcrrial, For quality and gradation of rock*fili material the clause E - U materials shall bo applicablet-U(2) Bl el sting and Excavation* a) The Contractor shall plan hi a quarrying and blasting operations in such a manner that bulk of material produced is of (-) 30cm size. The ( —) rock material from the approved area and quarried in approved snannor shall bs used in the rockfill shells of tho embankment* b) For riprap material to bo used on tho upstream race, separate quarrying and salvaging shall bo required* Tho gradation of riprap is r-poci fied in clause, £-4(2) Measurement and Payment for quarried material* The procosawd madtorial from the rock quarries fthtll be placed ana compacted in the dam as per clauses E-5 B-6 E-7 and E-8 which itoms shall include the entire t cost of processing, separating, grading, handling, placement and compaction of this material. No separate payment shall be mads for rhe excavation of tho material under this clause* TRANSITION .MATERIAL CUARHY 13-5(1) Excavation The transition material will be obtained from the approved weathered Basalt areas a* indicated on the Drawing or as selected by the Contractor end approved by the Engineer. The Contractor shall plan hia ripping, excavation and quarrying operations in such a manner that the arterial produced is of (-) Boa siw, and shall be responsible fey the specified quality and grading of transition material produced, for quality and gradation of transition ma to rial the clause E-M4) Materials shall be applicable. The (-) 8cm s±xe material from the approved uro* and quarried in approved manner shall be used in, the transition tones of the Embankment,*5 Measurement and payiWIit The transition material from the quarry shall be placed and compacted in the dam as per clauses E-5 to £-8 which items shall include the entire cost of processing, copiu^ting, grading, handling, placement and compaction of this material. No sepcrate payment shall bo made far the excavation of the material under this clause* ffitTjj _nQilRO^ A! lb AS D-6(l) General Borrow area for earth Fiatvriftl In the permanent work shall bo the borrow area shown on the Drawing* other borrow arso designated by the Engineer and other borrow area selected by the Contractor subject to approval by the Engineer, The outline of the borrow area uhgvn on Drawing is general and schematic the t actual borrow excavation may bo entirely within the area or partially outside of and beyond the indicated outline of borrow area. If the Contractor proposed to uso borrow area other than that shown on ths drawing* he shall make such investigations at his expense and furnish such evident? for approval of the Enginoor, as will indicate that the borrow area can be used, as n. source of material suitable for the embankment * D*6{2) Operation of Borrow Areas In the earth borrow areas the Contractor shall perform selective excavation to necessary depth and extent in the dry, draining of borrow areas, prawetting of material, in the borrow areas* dressing of borrow area during and after completion and disposition of materials to obtain and make the materials suitable for use in the work* 7 DISFD STTI ON OF MATERIALS Thu Contractor shall bo permitted to use all suitable materials from required excavation in the work shown on the drawings. Suitable materials from borrow areas and quarries shall be usotl in th* work shown on the Drawings | materials T1 - l6 from borrow and quarries that are designated by the Engineer as unsuitable shall be neatly disposed of In approved locations at no expense to the Employer. The Contractor shall to responsible for making and maintaining al haul roads required for transport of th* materials from the Borrow Areas, Excavation and Quarries to their required destinations. separate payment will be due to the Contractor for the haul road* and all costs related to this shall bo included in the unit prices of the maturials a? provided in the Bill of C^uan title* * FOUNDATION PREPARATION 0-8(1) Preparation of Contact Surface between Rock and Impervious Core—Dental Treatment, Exposed rock surface within tho reek-core contact areas shall be denned by brooming' and compressed air to permit inspection, Surface; treatment shall bo perf&rniDd if necessary, to «nsur« that no open or loosely filled fissures Joints or budding planes arc t present which might phrait seepage coneuntrfttions along the rock-core contact aroaa. Unsatisfactory material in pockatv seams and fissures shall be t renovudp if bo ordered by the Engineer* Fisaum, scams and shear zones exposed in the cleaning process shall be immediately filled with concrete, as directed by the Engineer, D-&(2) Structure-Found at ion Surface between Rock and Concrete Exposnd rock surface within the foundation against which concrete is to be- placed shall be cleaned and broomed and the surface and undulations shall be corned and filled with a Layer of blinding concrete as directed by the Engineer. The Blinding Concrete shall bo provided according to Specifications in Section F far Concrete,17 MEASUREMENT AND PAYMENTS D-gi(l) Excavation from Far th Storrow Areas, No soperate payment will be made to tho Contractor for clearing, stripping, wataring and excavation from the earth borrow areas* All excavation works from earth borrow areas shall bo included For payment under the item which covers the placement of this material.. D-9{2) Items No. 10>b* 202* Earth Excavation in foundations, a) Men* uranic nt Keasuromont For Earth Exesvation of foundations will bo made in cubic metro naasuro of unsuitable material in original positions acceptably moved to ths satisfaction of the Engineer* b) Payment Payment will be made far the number of cubic metres measured as provided above at the contract unit price par cubic metre and shell constitute full compensation for removing all unsuitable mutcirial including disposal in tha vaato areas.. D-$(3) I turn NO+ 2QJt a ) Mea 5 ur emon t Random-Rock Excavation in foundations, Ma asuremeet for Random-Rock Excavation in foundations as defined in Clause D*2(j) shall be made in cubic metre measure of Random*Rock in original position acceptably excavated* b) Payment Payment will be m^da for the number of cubic metres measured as provided above at the contract unit price per cubic metre and shall constitute full compensation for removing all unsuitable material U the waste arcaa and suitable material for stockpiling.ia - Itcrn Mo, 20^, Rock Excavation in foundations a) P Uca s t M*aauroint nt of Rock Excavation in foundzt ion4 ; as defined in P-2(2) «lwll be nod a in cubic metre ta±a*UF4 of Rock in urlfiiriai position acceptably excavated by litana ot. lino dril-tingj pro-splittinftT cushion blasting or by other approved methode, within the lines find grades provided by tho Engineer find stockpiled aa speciflod and directed by the Engineer, b) Payment Payment will ba mLdo for th* flietrcs jne-Eiuf&d sa above at the contract unit price fur excatj-flfl of Rock front the foundation area, inclurdinfi full GQrrpons.-xtion for stockpiling of this ma torla1 as spec1f1Cd » D-9(5) Rehandling of R^tk fror. the Approved Stockpile* No separate payment will bo made for rehandling of rock from the approved stockpile* £fld this work will ba included for payment of item which covers the pleicoment of materia 1 * 0*9(6) keck froED Quarrying of cubic No separate payntout for quarrying stockpiling f p sorting and nixing of rock material will be made to the Contra*tor* The EDeasurcununt fl-nd payment for Rockfill and Riprap ffifittrial from tho quarry will be m.idg in the fill undgr tho items which cuv&r the placement of rockfl11 and riprap material* 3-9(?) Item SDj, Surface Emntftl Treatnant flf Foundation for Core-Rack Contact-Dental ConOrate, &} Heas ur c me o t Miaeurorsent will bo made for- the number &r cubic metros of buntal Concrete acceptably placed in the foundation for treatment of ri *cures, a earns find shear zonn» as specified in clause □-&(1)r Na sapor#to rnoasurement will be made for clowning work roqulr#d in conneotiou with dental trfiatmont,b) Payment* - 19 Payment for dental concrete will h& made for the number of Cubic metres as oattsursd above at the contract unit price per cubic metre oT Dental concrete and shall constitute full compensation for filling up the clowned fissures» shear zones with concrete and all work related to this item. SECTION E CCNSTKUCTION Ob E/HTH ANi; -.OCK _FILI SCO PE The wotk covered by this section consists Of construction pf the Hain Dam, the cofTwrdftflis, and other Klsceiiancous fills* DEFINITION The tore fall os usc-d in Section E of these Specifications is defined as the earth and rock fill portion® of the main daps and cofferdams structures and all other fill, riprap, filter and transition materials for these dam*, and as used in connection with other structures* GENERAL PROVISIONS E-J(1) Equi pmen t and He thud s Before proceeding with any of tho work specified in thia section, the Contractor shall furnish thn construction sequence and material utilisation achene he proposes to use in fill construction to the Engineer as further information for approval. £*1(2) Linas and Grados Fill shall be constructed to the lines, grades and cross-aoctione Indicated on the Drawings, unlose otherwise directed by the- Engineer.* Materials Conforming to the requirements specified in clause E—Materials, shall be placed and compacted within Lha indicated ions limits* The Engineer reserves the right to increase or decrease the foundation width®, the enibnnkpaent slopes or the sone limits or Lo make such other changes in tho ombrinkmc-nt sections as may bo deemed necessary to produce safe structures.30 &r For officiant utilisation Of aatsrlBls frOB required axc4¥fiti<W* SsttlflBMt or the pflst construeticrt period will prorld*<l Cor by merlins ib* height or iha Boctifch*. inquire-* height inarwaa* *111 be datc-rr-irtOti onn wclfiod by the Engineer fi-i* sottlenont jb.prv^lion (W<1* as the worlf pro^rtsiLS , 3(3) Conduct of Vork i) Maintenance, Protection and Tostl* The Contractor shall -laintain and protect the Mflifi Dem in o satisfactory condition at all tinea until final eaciplation of all work under the Contract, Th a Ztiginocr will o&tabllsh n prunes* of tcutirtii; of in—place fill to iniura that the uork is being porforinod in ■confonzanto to the requirements of iheso spoci f i cut inns . The Engineer will also perfora tests of enteritis at their source and during- their prossuss Ing and handling as, necessary Tor quality control and the Contractor shall adjust his sothods as required for tht iiftprevunen i of the product to seet Specification requirements* Tests of laatwrials and cmbanlraont construction will bo made at regular intervals and tho Engineer will notify tho Contractor of any deficiencies in materia Is and/or cans true cion whdn tho results of testa are known* Deficiencies shall be remedied by such ehomutoi as the Engineer ™>y direct. The Contractor taay bo required to removep nt his awn expense, any fill placed outside of the proscribed slope lin&a whore »uch placoiMnt is not authorised by tho Engineer,. b) Haul aoed s Maul reads shall be loentjd and constructed ns approved by tho Engineer, They shall be designed to maintain the intended traffic safelyt without endangering- ettbanltmont stability d rut ng thn PEfcanknont eenstruetion ported and shall ba constructed In a acnner to preclude contamination ar alteration of materials forming thu a&bankfflont for- 2 1 section. All rpads Located on embankment slopw ska 11 be removed at the completion of nabankiflt-nt construction# Haul or construction roods shall bo provided and will not b<- treasured for payment* RATERIAL5 E-4(l) General Fill materials shall bo obtained from required excavations, frern tho borrow areas and from rock quarries as indicated on the Drawings and as specified in Suction D* nil materials shall confora to the requirements of the- Spool f i cat ions B and their disposition in the dam shall bo as shown on the Drawings except as otherwise directed by the Engineer* E-Ms) hiprap Material for riprap slope protection on the upstream of the dam shall bo an^ul«r sound, durable r blocky Rdekp free from cracks, suams or other defects which would tend to incrocse unduly its deterioration from natural causes* Material for riprap shall tonfono to the following gonorel gradation of rook sizes# Gradation Requirement for RlpTJkp Naterl*! Material Size Percent Finer Than, By Voight 70 CH 100 dvora^t *To ± fjh t 175 kff 60 ” 80 to 90 110 " 13 " 10 to 20 10 " 8 ■' Not Exceeding ,ft 1 " E-U(3) Bdck-fill shells Material for upstream and downstrt»;n rock-nil sheila shall ta& arnjitlar, sou/nl, durable blocky rack* uell graded within the rollawing gradation limits* Gradation rtuquircmcnta for Pock-fill Satorlal Hatcrinl Si zu 30 CD Nd* U slave NO* 200 Alova (o.OTiiBu) Percent Finer Than By height Not » 100 Sjceafldlng 23 u3- 22 - Oversize rocks produced in th* required excavnUons or brought frost the. quarry shall bo pushed towards the outer slopes of tht rock-fill shells. E-^fU) Transition Material Material for conjpftCtod transition upstrcRD and downstream of clay core shall be weathered Basalt t angular, sound and durable &s specified in clause D—2(^1 ftr.fi quarried by mor-ris of ripping and scraping to a gradation within the followinc Helts;* Gradation ^cquiFoments Material Si zo 8 cm 2 •■ No* sieve- (^*75aira} No, 200 SiGVQ (O,D7Umrn) for Transition Material Percent Finer Than By %'oi^ht 100 50 - 80 25 - 50 5*15 E-Mi) Impervious Core Material for compacted impervious core shall bo th* natural deposits of Clay designated as borrow area 3A on Drawing Ko* Di 101* PLACEMENT E-S(l) General No fill sball b<j placed on any part of the dam or other structure foundations until such area has boon inspected and approved* Materials of th* sovoral types and qualities required shall be deposited and distributed witbin the zone limits shown on the Drawings and to the slopes indi.eetod within the tolerances specified below* The gradation and distributlor of materials in the ^onos of the dam shall bo such as to produce in tach tone a reasonably wall graded mass* Fill raatorial shall bo handled end placed by such methods as will minimize sogrogatlon in lifts T of depths as specified, and in general the smaller ilxes of material within zones of rockflll uro placed towards the clny tore and the larger sikca towards p the outer1' ’ ■ - 23 - fELCflS, Tiers rockfill and riprap alopa prototUon or* placed on pGrctficncly c/posad inbonkstaot alopoa, the placing of fill shall he such aq to obtain surfaces within a tolerance of plus ’5c™ ''" pinus 8Cm except c that the e^trono ralnvs t3Ltrance shell not be continuous over tn area greater th-tn 20 shut re cetres. For all other zones not specified ahov-* or eloowhtre, material shall ba placed ns close ts practicnblo to tlic- lines shown on the Jrawings as approved by tfto Engineer« Eridgtn.j in the rill! and ill Jlabs or slabby rock shall bo broken down. L- 5 ( 2 ) Rate of playcn^nl Unless otherwise indicated or directed, tho top of ■cinch o ml: ank mont zone 4 including cho riprap shall p be taaititainod at approximoLely tho sam« level throu^h^ut each embankment construction stage re.-Tr.rd.lcss of the number of types of materials being placed, except ns say bo required to prevent mixture of osbankaont materials» Material shall bo delivered in proper sequence and distributed over th< surfaces of the fills it such rate as will ensure the completion of each ombankEcnt zone and >ta^e thsr&af within tho specified time* E*S(3) Slope protaction plncoraant Riprap material shall bo placed by dumping on the emb&nkmont within the limits indicfttod in such a laannor as to produce a well graded mass of rock with, tho minifliuin prcc tieable pore ant a go of voids and; t shall be constructed within tho specified tolerance to the Lines and grades shown on tho leaving* or staked in the field* The larger stoney shall be well diatributod and the finished riprap shall bo Tree from, ob J oct io nab lo pocks tj of snail stones and clusters of larger stones* The desired distribution of the various sizes of stones throughout the ewias shall bo obtained by selective loading or th© utorial at its amirCQ and by controlled dumping of successive loads during final placing* Rearranging c-f individual 32*1 stones by mochanical equipment or by hand will bo roquirc-d to ths Gxtunt necessary to obtain a reasonably well graded distribution. E-5(U) Impervious Fill Placement The Impervious fill for clay core shall be placed in the Embankments within the limits indicated for impervious core. If in tha opinion of ttu Engineer the rolled surface of any layer of impervious fill is too dry or smooth to bond properly with the layer of material to be placed thoroon, it shall be snoistenod and worked with a Lt.-row or scarifier in an approved manner to sufficient depth to provide a satisfactory bonding surface before the succeeding layer of impervious material is placed. If in the opinion of Engineer tho rolled surface of any layer of in—place impervious fill is too wot for proper placement of the luyor to bo placed thereon, it shall bo removed or scarified or han awed to reduce the water content to the required amount before the succeeding layer is placed thereon. No impervious fill shall be placed below water* The Impervious fill for clay blanket upstream of tho dam to cover exposed rock shall be placed in the sumo manner as specified above. E-5<5) Rock-fill Placement Tho upstream and downstream rockfill zones material shall bo placed in the embankment within the Halts indicated on the Drawings. Rearrangement of individual stones by mechanical equipment or by hand methods will bo required to the extent necessary to produce a level, smooth and even finish at the Berm. £-5(6) Transition Material Placement Tho transition material shall bo placed inraodiately upstream and downstream of the impervious core within tho limits shown on the drawings, Caro shall bo taken that transition material doos not got mixed with the impervious fill*The loading and handling of the transition raatorial ahull be done in such a Banner that segregation will be minimized, If considered necessary by the Engineert seine mixing by scarifying or wetting of material before hauling shall bo dons in order to create a homo gen ecus lty ar v SPREADING After depositing! the material shall bo spread by approved moftns in approximately horizontal layers of uniform thickness over placement ^rsa. The layers of the impervious material after spreading in uniform layer shall bo scarified tiy liariows tc break &ny lumps of toatorinl and to ensure proper and uniform compaction. Except os otherwise directed by the Engineer as □ result- of the tests conducted during constructions the thickness of each compacted layer of impervious core material shall not exceed 15cm, the compacted thickness of transition material shall not exceed 25cm and the compacted thickness of roekrill material shall not exceed 30cms The 1 a Contractor shall det ermine by staking test sections, the loose lift thickness required in order to attain the compacted thickness speoifiad hureinp- As soon as practicable after c-oirane nee merit of construction of impervious zone, the fill surface shall bo sloped with a transverse slope of net loss than J percent throughout construction* During dumping and spreading the Contractor shall provide at all times adequate facilities for removal of all unsuitable and/or oversize materia 1. Unsuitable materials shall be removed from the opbankeiunt and disposed of in an ipproved manner* The* entire surface of any section of ombankinunt under construction shall be maintained in such condition that construction equipment can travel on of the stiction* Ruts in the surface of any layer shcli be- filled satisfactorily before compacting, MOISTURE_CONTROL E-7(l) Impervious Material (clay core) Control of moisture content will bo placing and compacting material in the c bq fftr as pro.gti .able the material shall bo delivered ■ // # and spread in moisture range of 2.0 percent below- 26 standard optlaws io by Irrigating or iryln£ within ch<» tcrrorf trmf, 0a □ ptlcv-- wljturo r«nt*n'. J thi basis of tests conduct.-^ -luring construction th. Engineer r<•$<■ -rvr:s th* ri ht *o sinks so 1'• ic41 led ia the rec, — ir■*■’' rang- of ooistur* for this aitcri'lt L*n*y such moisture control os nw* de d for ainor adjusts nt of ooistur; changes cr.i»-4 by mporWon luring handling ind plGCfn^nt or iron r.iinfill shall bo nccor.plishod on th* fill. Th.* aolsturo ’-hall bo distributed unifcraly through-out each 1 y.-r srior to confection, Optimum moisture rout nt -.hitl be dctorsiinod in thi labcrnlnry Vy th- n-cin-ur by suxkiad Standard corpaction tOOtfc Tttr apttaur s^Hiur-ii contents for the irntoriols in th. L-orrow ir a will bo furnished by thp to.jncmr to th; Contractor at duly int rvMs or at si .mi flctift c elun^vs cif ant- rial b< m ;: placed* t E-7(2) Other Zoned No particular r.oistiirc control will be required for compact ion of maVrinls In dtW zonon of th^ dam. 5ohd addition of doiattiru in the trnnsttlsn foaos nnttrinl way bi? required to reduce sw<r-<a tiun tendencies* The addition of nt* r for this purp^iu shall be accomplished prior tu hajidlln^* COMPACT!ON E-8(l) Equipment Compiletion Lquipboiu shall c^nfoni to the lollaviEii’ Foments and shall be u?sd as proscribed in subsequent clauses and ns dst wrciinsd utd ordered by the tntfinm ns a result of the evsts conducted during construction* n) Vibratory Kellars Vibratory rcllvru shall haw \ total static weight of npproxLately t^n short Um with at ( laast ninety percent of the wi£ht transalttcd to the ground through a singla a^joth druai whvn thv roller is stundln^ in a lovel position hitch*-! to the towing v^hiclv The dian-t^v ot th* drw # shall bu approxisuLtwly five r ^i ivl width v27 approximately six fact. The roller shall produce a dynamic impact of approximately sixty thousand pounds at rated vibir&tlon freqwoncy. The roller shall be towed at speeds not to exceed U Km par hour. The equipment manufacturer shall furnish sufficient data# drawings and computations for verification of the utovo specifications, and the Chirac ter and efficiency of this ^ouipnent shall ba subject to tbs approval of tho fc-ngineor. b) Tamping Rollers Tamping Hollers shall be used for compacting Impervious fill. Each drum of the roller shall have an outside dl’-mcrter of not. les$ than. 5 feet and shall not bt» less than 4 feat or more than 6 fott In length. Tho space between tho t^o drums when on a Level surface shall not be lesa than 12 inches or more than 15 inches. Ono tamping foot Shall bo provided on the drum for at least WO square inch of drum sur-Taec. Th® length of each taraping foot from the outside surface of drum shall bo- not less than 9 inches. Th® cross-section area of each tamping foot shall bo not more than 10 square inches at a place normal to tho axis of the shaft six inches from the drum surface and shall be not loss than 7 square inches at eight inches from the drum surface. Th® weight of roller when fully Loaded shall not be leas than 4 000 pounds per t foot length of drum. The loading used shall be as required to obtain the desired compaction. During the operation of rolling# the Contractor shall kuup the 3pitQ between the tamping foot clear of materials which would impair tho effectiveness of the tamping rollers. c) Special Compactors Compaction of materials In areas where It is intprac Li cable to use a roller or ft traitor, as provided abova, shall bo performed by the u9e of compactors of tho heavy-duty power-driven typo.They shall he capable of producing densities at least equal to tho&e produced by the equipment specified in sub-clauses (a) and ( ) hereof. All b such equipment will be subject to approval by the Engineer. Compactors which do not obtain the required density with reasonable amount of coverage of each layer and at a production rate consistent with the adjacent embankment, shall not be used in the work, Com^bctod layer thicknesses by this equipment shall nut exceed IQ tens* d) Sprinkling Equipment Sprinkling c.quipident shall consist of tank t ruck $ prd9•urfi-dI s tri but ora, or o ther equi pm&nt 1 designed to apply water unirurtnly and in controlled quantities to variable widths of surface* Tank trucks shall be equipod with positive* shut off valves so that no leakage will result from the nqzzl&s ^hon equipment la not operating. Leaks shall be repaired irrameaiatoly and any material randersd too wet because of faulty equipment shall be removed or reconditioned and no additional pay ment will be raado thereof. B-8(2) Cempeotion General After a layer of fill rtsatGrial haa been deposited, it shall be scarified* bladed or otherwise treated as not ear? ary to product a uniform material with respect to moisture content and grain aise distribution, in accordance with clause (E-7) Moisture Control, Mixing t shall be performed to the full depth of the layer If so required, Whan the moisture content and condition of the layor is satisfactory the lift shall bo compacted. Portions of the fill which are not accussiblo to the roller shill be placed in lifts consistent with the material size and compacted with power tampers to a degree equal to that obtained on tho other portions of the compacted fill by rolling as specified, Dumping, spreading, sprinkling, and Compacting may be parfortuod at the bw time at29 differant pointB along a section of embankment when there is sufficient area to permit these operations tn proceed simultaneously• £-.&(]) Compaction of fill material Except S3 otherwise determined and ordered by the Engineer fill materials shall be deposited in successive layers of thickness as specified, and compacted aS fallows: a) Each layer ef material in the impervious (clay) core zone shall bo compacted with not Less than ten passes of the specified taciping roller, b) In til other zomv GfiCh layer of material, except riprap slope protection shall be cocipnctod with not lees than four passes of the specified vibratory- roller. c) Ona pass of the vibratory roller is defined aa one complete cov&rsgc of the surface of the area being compacted, in which the drum of the roller comes in contact with tho entire surface of the area. For the tacplng roller, the same definition shall apply, no consideration being given to the spaces between the drums, the entire width between the outside- walls of the outside drums being considered as a continuous drum. Additional Soiling If it is ao determined by the Engineer, that tho desired compaction of any portion of the embankment is not secured by the minimum number of passes specified, additional complete passes to the extend directed by tho Engineer shall be raade over the surface area of such designated portion. * MISC^LL-RKKaiJS FILLS AN/-1 BACKFILLS E-9(l) General In addition to the embankment fill f*r the dam certain mlacellanoous fills and backfills will be required fur spillway and other structures. Material requirementa for those baekfilla shall bo specified on- 30 - Mm Drawings and the tyn® of material for fills Will bo as ispocified in Clause E-'l^ Materials or kJ ■Jlreettd by ttHJ Engineer* E-9(2) Operati&ns Adjacent tQ Fz «ClH£ Structures In gjn&rsl, no fill, backfill or Othw load shall tiv placed on or against the surfdCft of anf concrete itructura c?.filer tten is p.? rmi & a i L11 with rcg-Ord to the protection oT the structure* At location* where the fliifcty Of ths structures night be endangered, such operations shall not proceed until the construction has turn acm*lat'(M to such extent and Cho concrete has attained sufficient strength to withstand any stresses that might c&vulDp incidental to the operations required. If so required the Co-ntractcr shall subnit details of the methods of placement * spreading and compaction h.j propo-scs to use far the protection of structures at such locations for ths approval of the Engineer. Vithin areas where roller® cannot be used, tho material vbftll be compacted by cleans of power tampersB KEASUKSNEMT AJC ]VlTM.4MT E-lO(l) I tats* No, 301 through 30€, Main Data Fills. a.) Measurement H«&*urtwnt under these items will be computed by actual Tneasureaenti raethoda and will ba made of the number of cubic metres cf each naturlul zone in place and accepted in the onbanknent fill to th® lines grades and cross-aiictiens shown on the T drawings or established by tho Engineer^ b) Paysont Payment shall constitute full compensation for constructing thn embank m-cmt from required borrow erg.ua, quarries- and stockpile a including: excavatIng, 1oading rehnndlingt hauling, B processing,. moistening., placing and. compacting the inataritlp and all other work related to the XteiDfli) I tore No,. - 31. Riprap Slope Protection Payment will be i^de for the number of cubit meters measured as provided above at the Contract unit price per Cubic uwtro for Riprap. il) item No* 302* Rockfill Zone Payment will he nsade for the number of cubic metros measured as provided above at the Contract unit price par cubic snetro for Rock fill Zone# ili) Itoni No# 303, Transition Material Zone, Payment will ba mad* for the number Of cubic metros ffi&asurod ns provided above at the Contract unit price per cubic metre for Transition Material Zone# iv) Trea No. 30^ Impervious Fill Zone (Clay core) t P&yment will be made for the number of cubic meters measured as provided above at the Contract unit price per cubic metro for lapLrviouS Fill Zone (Clay core)* v} It^n He. 305p Impervious Fi.ll for clay Blanket Payment will bo made for the number of cubic rtotres measured as provided above &t the Contract unit price per cubic metro for Impervious. Fill placed As Clay Blanket# vl) Item No# JQd, Miscollbous Backfill Payment will be made for tho number of cubic metros measured as provided above at Contract unit price per cubic metre for Hlsc*Ilaous Backfill behind retaining walls nnd other structures ond shall constitute full compensation for constructing thia backfill with the material■ obtained from the specified stockpiles including hauling, placing and compacting the Riat erial and all other works rotated to the iu?432 - .SECTICK ? CONCRETE, PLAIN .'.ND i'J/NICE CEP P-1 SCOPE Tbis section cover a the manufac ture , forming, tran sporting! placing, stripping of forms, finishing, and curing of concrete in the gtructures included in the specifications. F-2 COMPOSITION Concrete shall be composed of Portland cement, water, fine and coarse aggregate, F-3 QUALITY The concrete mixture will be designed by the Engineer who will determine the required quality of the concrete for the structures covered by these specifications. P-4 CE?gNT ¥-4(1) Cement shall be furnished packaged as approved by the Engineer, It shall be Portland Cement and shall conform to British Standard 12*1^^8, Portland Cement (ordinary) or to ASTM Designation C 150-64, Standard Speciffoat ion for Port land Cement, for Type I cement, 1-4(2) Test Requirements Cement shall be sampled at storage site and tested at the expense of the ccntraotor, in accordance with the ASTM requirements. Additional tests will be made by, or under- 33 ’ the supervision gf the Engineer, and fit the expense o. Bnpioyer, No coinent shall be used until notice has been given by the Engineer that the test results are satis factory. If tests prove that ?- cement which has been delivered is unsatisfactory, it shall be promptly removed from the site of work. Cement which has been in storage at the project site longer than four months shall not be used until retest proves it to be satisfactory. F-4(3) Transportation of Cement Transportation of cement to the storage or tq the site of work shall be accomplished in such a manner that cement ,to is completely protected from exposure^ moisture. Cement which has been adversely affected by moisture as deteraitied by the Engineer, shall be rejected, F-4(4) Storage Immediately upon receipt at the site of the work, cement shall be stored la a dry we at her-tight and properly ventilat ed structure. All storage facilities shall be subject to approval and shall be such as to permit easy access for inspection and identification. Sufficient cement shall be in storage at the work site to complete any lift of concrete started. The Contractor shall use cement in the chronological order delivered at the site in order that cement may not became widely aged. P-5 AGGREGATES P- 5(1) Composition Fine aggregate shall generally conaist of natural etnd, however, uae of manufactured sand or ti combination of natural and manufactured aand will ba permitted on the approval of the Engineer, Ccnraa aggregate shall consist of natural nvate- 3^ gravel, or crushed gravel or n combination thereof. F-5(2) Source The Contractor shall bring concrete aggregate from approved natural deposits or shell produce crushed aggregate from approved locutions. The Contractor snail se respons^-'lc for ascertaining the extent of work, including type of equipment required and amount af waste involved in producing a sufficient quatity required of acceptable aggregate from the sources finally selected by him and approved by the Engineer* ?-5(3) Sampling and Testing During construction, aggregates will be sampled as delivered to the mixer to determine compliance with specification provisions. The Contractor shall provide facilities as may be necessary for the ready collection of representative test samples. The Engineer will obtain and test such samples, at the expense of the Einployer, using appropriate standard test methods selected by the Engineer, Tests and analysis of aggregates at various stages in the processing and handling operations will be made at the discretion of the Engineer, Testing of concrete aggregates by the Engineer shall not relieve the contractor of his responsibility to maintain control, to ensure the production, stock piling and handling of both fine and coarse aggregates in accordance with these speoificationo, F—5(4) Processed Aggregate Aggregates as delivered to the mixers, shall consist ( of clean, and uncoated particles, VThero directed by the- 33 - Qiginecr duHt shall be retaoY&d from the coarae aggregate by adequate washing. The aggregates shall conform to the following specific requirements* a) Fine aggregate The grading and uniform ty of fine aggregate as delivered to the mixers shall conform to the following requirements. Sieve Designation U.S, Standard Square Mesh 3/311 No, 4 No. 8 No. 16 No. 30 No. 50 No. 100 Percent Pegging 100 95 to 100 SO to too 50 to 85 25 to 60 10 to 30 2 to 10 In addition to the grading limita the fine aggregate aa delivered to the mixer, shall have a fineness modulus of not lees then 2.30 nor more than 3,10. b) Coarse aggregate The grading of the coarse aggregate shall con form to the following requirements as delivered to the mixer. U.S, Standard Sieve Si eq 1 in X in % in No. 4 Percentage by Weight Paaaing Individual Sieve 100 90 - 100 20 - 40 0 - 5_J. ' • -t . €■. ■ -s ■ I- f. 'r ■■ a h'-’; * " ‘.-1 ' - b .1 ■■>.. -I 'f■1 ■ ■ ' jj <_ ■ - • j- 1/ A-.r .■i . ■P>> ' 14 * - _> . ij X- I I ■ ■ l-x .-■ ■ 4I ■tr ,-T ? * rJj^4? - T yx ■ r, ■-.Jt J ?p- ■, .* t .- ■ «'• '■ 4 % 1B Cl ■ I c) Vartlcle. Shape ■ .1 '■"* - . ■; I C- -I .1 Iw.4 "i- ..n r> v -i i '■. ' '■ '.I-! '■• ' '-r - * r< .'■■■ ' ,'t ■■'■. £he Shape of the particles in the fine aEgregBte I J* and in the coareti n^-regatc shall b* gener-illy s^her^ci) or cubical. i'he Quantity of flat and rAon^tted parti til ob £h the jaoazsQ ageregute, a a dfd£LBGd and detsruined by standard tec to approved by' the Hii^iaeeT oh All hot sicced 25 p&rct-Pt. A flat pBrtl.clu in one having u retio of irldth to thickness greater than thre*. An ^ictwited particle in 1: ■r ' Vf i"1 -1 . i ■' ■cr one having a ratio of length to width greater tiior ■P-5(5) 'Storafie AggregsitAS snail se etored at thd nite of work in such l: tLuJuior p.n to prevent th* incluaion of f-erai^i nroe, J-' F •l ■ ! 1 ?Ar ,■ -+i LJ 1 L“. I <.■ - : <■■■ !- z •. -- fc u . ■ t x - *-_■ ■” ■* • 1 aaterinla in A ,fc-' J- V ''i - - r concrete, Sufficient' .-.■ <4\:- ■ ■*■ ■ < i =. :- .■■ - ■ ' . • .■■■.. 1 j » ‘ ■. tmgregfcte shvLl bo r j ■ ■ ■j r-*-. OfiintsinGd at thcr aits at all - r-, . . __ ___ - . ..... JHr tims io p^rai* cdniiimou# r? 1_8 r placo-jEexat asd conrplc-tlon af ljiv lift af concrete nterted* 1-5(6) Moisture Control Ml fine msgregatee and eparoe eggnigpid choll•rQutln JW b ’- i. “ . L ■ ■?!-:- -5- J _■ .. “■’■11 : ■. ■ in free-draining atpraga at th« 3ite for atleoat 72 houit* iaaedlately prior to use. Under no conditions shall tha "*. ! ■7 ;□ ■ ■' ■’ ' L. 1- ■ -? ■ > « 3i FI 'J ¥ 1 .-ggrogatee tie delivered to the taixera dripping to . , 11 I i- K-C tfAEES ■fat er for iraghing aggregates and for diking and curing ■’ ° . » ■1 j* j s \ 00aerate ahull be fveflh witter free irajo injurious finfuxtff of ■. ' £Tr_ / -■ ' '■■ <":>■■ <"'r. ' 'j■'' 5\vS j ? J i'"/ z " , j-® "■' r / '*■’ , PT ether deloioricoff ■» oil^Pld, salt, alkali, orgcjiio natter flihatcuioon an dfltarja±nQfl by aiejidtird +601:5 ctelected 1 ’ 'j ■4 hjT the l"j 1 n i" inner. lv ■3 i - ■ »= ■ ft 1 r* JT . j ■. - ■ ■, L i-i b r «■ ■> £ .- r Ji- ; •. Z" b! ; .'l? 4 J- vu r-S ft j .*■ 1-4 '■ 1 'l 1 ■Wt" j ut“- ■< lf_T k B ?S : - ■-2- i ■?' -■ —i ■* ,4 ji ?■■ ■ ."J 4 1■ 3- I. 1 ■’ rl ”.1 8 > Sj b .r. A+* >r ■- S■ L J” ■v L-' I *V, :' ■ T «■ ■' '. ♦ *• I- I A d. > - ■* _ l" 4 ■: L ■ "!. ' -■j •: ■ Si i= .Fj w •i* ■*. ■I.. r 4- . I V -■a ?j.A-37 P-7 PROFORTIONIKG 0? CONCRETE P-7C1) Control Txial auixoa and teate will be made by the Engineer during the course of the work for the purposes of designing the miles and for quality control. The proportions of all material entering into the concrete shall be es directed by the Engineer. The proportions will be changed whenever ouch change is determined necessary to maintain the standard of quality required for the structures covered by these specifications and to the varying conditions encountered during construction. The Contractor will be entitled to no compensation additional to that included in the prices for the applicable tender 1terns in the Bill of quatities because of such changes. P-7(2) Cement Content The cement content of concrete for various parts of the structure will range from 200kg per cubic metre to 365kg per cubic metre depending on the structural requirements. P-7(3) Water Content a) Water Cement Ratio* In general, the Engineer's design of mix will provide for water cement ratio by weight (exclusive of water absorbed by the aggregates) which will be determined on the basis of producing concrete having suitable workability, density, impermeability, durability arid the required strength without the use of excessive amount of cement, It is expected that water cement ratios will vary from 0.45 to 0.6, depending on the strength of concrete and the type of structure.- JB - b) Conistency The amount of water used in the concrete shall be regulated as required to Becure concrete of proper con- eistency, Addition of water to compensate for stiffening of the concrete befor placing will not be permitted. Uniformity in concrete consistency from batch to batoh- will be required. F-7(4) Strength of Concrete Concrete for the several structures and parts therof shall have compressive or flexural strengths at least equal to the minimum allowable strengths shown on the Drawings, except us otherwise directed by the Engineer* F-7C5) Slump The slump cf the concrete after concrete has been deposited but before it has bean consolidated shull not exceed 3 inches {B cina)* The Engineer reserves the right to require a lesser slump whenever such slump is practicable. Slump will bo determined in accordance with ASH! Designat ion C - 143-5 3, standard method of test for slhmp of Protland Cement Concrete, F-0 TEST OF CONCRETE Strength tests of the concrete placed during the course of the work will be made by the Engineer* The Contractor shall provide such facilities ca may be necessary for procuring and handling representative test samples. Cylinders will be tested by the Engineer in accordance with the applicable requirements of ASTH- 39 - Denigration 639-64, standard Method of Test for compressive strength of Molded concrete cylinders, or cubes will be tested in accordance with the applicable British Standard Specifications. The test results will be based on the average of the strength of the test specimens. The standard age of test will be 2B days, but 7 days test may be used at the discretion of the Engineer, bused, on the relation between the 7 days and 28 days strengths of concrete qb established by tests for the materials and proportions used The frequency of tests will be determined by the Engineer on the basis of pH cement rate end. the structure to assure himself that the concrete being placed conforms to the apeci- fications and design requirements. F-9 MIXING F-9(1) Capacity The Contractor ahull provide concrete miring arrangement having sufficient capacity to produce concrete at such a rate ae will enable the completion of monolith pours and will assure the completion of concrete structures in accordance with the requirements of the construction schedule. F-9(2) Location The concrete mixers shall be installed at the site of work at locations selected by the Contractor and approved by the Engineer.- 40 - F- 9 (J) Arr-ng ement Seperate bins or compartments shall bo provided for each al'isaification of aggregate. The compartments shall be of sinple size and so constructed that the materials will be maintained sepcrated under all working conditions. All materials shall be preferably batched by weight* Batching by volume may be allowed by the Engineer, P—9(4) Water Batches A suitable water measuring device shall be provided by the Contractor which will be capable of measuring mixing water within the specified requirements for each batch to control water cement ration The water shall be delivered to the mixer ensuring that no leakage occurs, P-9(5) Mixers Suitable mixers ehall be provided by the Contractor* Each roixer shall be capable of combining the materials into a uniform mixture and of discharging this mixture without segregation. Mixers shall not be charged in excess of the capacity recommended by the manufacturer an the name plate. Excessive overmixing requiring additions of water will not be permitted. The mixers shall be operated at a drum speed designated by the iB&nufacturers an the name plate. The mixers □hall be maintained ir. satisfactory operating condition, and mixer drums shell be kept free of hardened concrete. Mixer blades shall be replaced when worn down more than 10 percent of their depth.- tn - F-10 conveying Concrete shall be conveyed from mixer to tons as rapidly as practicable, by methods which will prevent segregation gr laSa of ingredients. Any hopper through which the cuncTpte passes shall he conical in ship*. There shall be no vertical drop greeter then i.5 metre except where suitable equipment io provided to prevent segregation and Where specifically authorised* Chutes or Other a i mi~ 1 ay equipment will not be permitted for conveying concrete except where the use of such equipment io approved in writing by' the Engineer in advance of any use. P-11 PLACING P-11{1) General Ho concrete shall be placed in the ktruatun Until the methods of placement have been approved by the Engineer, Approval of the method of placement proposed will not relieve the Contractor of responsibility for its adequacy, Concrete □ hall toe worked into the Comers and angles of the Toms and around all reinforcement and embedded items without pw- Kitting the material to segregate, Concrete shall he deposited as close as possible to its final position in the forma* The depositing of concrete 3hnll bo regulated so that the concrete nay be effectively cotnpuctcd with a minimuH of lateral movement into horizontal layers, approximately 30 to 45 ems in thickness, Not m&re than two cubic metres may be deposited in one pile for compaction* The surfaces of construction- 42 - joints .shall be kept? continuously wet for at least eighteen hours during the twenty four hour period prior to placing concrete except as otherwise directed by the &igineer All free water shall be removed and the construction joint ahull be dry of surface water prior to placement of cohereto. Concrete placement will Hot be permitted, when, in the opinion of the Engineer westb&r conditions prevent proper placement and consolidation, F-11(2) Tine Interval Between Hiring end Placing Concrete eh nil be pieced within thirty minutes . after it has been minted, unless otherwise approved by the Engineer. Lifts in Concrete Hie depth of concrete placed in each lift will Vo as shown on the Drawings or us directed by the Engineer, The placement snail be carried out at such a rate that formation of cold joints will be prevented, Slobs shall b* placed in one lift unless otherwise authoriied or directed. In walls, slabs and other structures lift shall terminate at such levels as will conform to structural details,* Vibration of Concrete Concrete shall he oocipacted with mechanical vibrating equipment suppleaer-ted by handspading and tamping, In nc cues shall vibrators be used to transport concrete lnaitJe the forms, The vibrating equipment shall be of the interunli type and shall at all times he adequate in number of unite and power of each unit to properly conholidate all concrete, Borm ar surface vibrations shall not be used unless fspeai*by - ficnlly approvad* Intom&l vibrators shall maintain a frequency when submerged in the concrete of not loss than 7,000 impulses per minute, The intensity (amplitude) of vibration shill be sufficient to produce satisfactory consolidation. The duration of vibration shall be limited to that necessary to produce satisfactory conaplidation. Excessive surface working will ngt be permitted, B-11.(5) Flue inc Concrete Through Reinforcement and in Spillway a) In placing concrete through reiuforcernent care shall be taken that no segregation of the coarse aggregate occurs, b) The unformed portions of ogee crest at spillways, chute slab placed on slope the ( flip bucket at the spillway end which are to be finished, shall be placed according to the grade and finished by accurate screeding, In general, chute slub of spillway oh&ll be divided into strips consisting of square blocks with construction control Joints except seme pours which will be odd sizes, Each Strip of the chute slab shall be placed in a single continuous pour and in the direction from dowr. slope upwards and for any r&aaor,, placing any completing its full length, in a sequence strip by strip. If, at the strips is interupptedieforc a construction-control .joint shall be provided nt the temporary end of the strip, Unless other wise shown or. the Brewings or diicoted by the ^igineer, the maximum differential in height between adjacent piass concrete motiolitha shall be 3 metres.F-11(6) Placing Concrete on Rock Rock surface upon which concrete io to he placed shs.13 be clean free from oil, standing or running water, mud, druiray rock, coatings, debris, loose or semi detached or unsound fragments* Faults end seams shall be cleaned to satisfactory depth and to the firm rook on the sides* Immediately before concrete in placed, all rock surface shall be throughly cle?-ocd by use of air water jets or other approved, methods. All rock surfaces shall be kept" continuously tret for at least 24 hours immediately prior to placing concrete thereon. F-12 CONSTRUCTION JOINT TREATMENT P-12(1) General Ah a lift is completed, the top surface shell be immediately end carefully protected from any oondition that will damage or adversely affect the hardening of concrete* F-12(2) Cleaning Horizontal construction joints on lifts shell be prepared far receiving the next lift by cleaning with air-water cutting. The surface shall be cut with a high pressure air-water j>t to remove all laitance and to expose clean, sound aggregate, but not so as to undercut the edges of the larger particles of the aggregate. The air pressure used in the jet shell be WO Psi plus or minus 10 Psi and the water pressure shall ba just sufficient to bring the water into effective influence of the air pressure* After cutting, the surface shall bo washed and rinsed ub long as there is any trace of cloudiness of the wash water. The surface shall again be washed with an air-water jet just prior to placing the succeeding lift.46 b) Polyvinylchloride Water Stops Polyvinylchloride water stops shall be extruded from an elastomericplastic compound the basic resin of which sail be polyvinylchloride (PVC). P-14 CURING AND PROJECTION a) All concrete shall be cured for a period of not less than fourteen (14) consecutive days by an approved method or combination of Methods. The contractor shall have all equipment needed for adequate curing and protection of the concrete available at site before actual concrete placement begins, The curing methods shall be approved by the Engineer. Unhardened concrete shall be protected from rain and flowing water. All concrete shall be adequately protected from damage, b) Concrete shall be maist-cured by maintaining all surfaces continuously (oct periodically) wet for the duration of the entire curing period. Water for curing shall be clean end free froir. any elements which will cause staining or discolouration of the concrete. The quality of curing water shall be the same as given in clause E-G. Where forme of wood lagging are used and left in place during curing the r lagging shall be kept wet at all times. Horizontal construct ion joints and finished horizontal surfaces cured with sand shall be covered with a minimum uniform thickness of 5 eras of sand which shall be kept continuous orturated during the entire curing period. r- 1+7 - F-15 PORTAS P-15(1) General Forme ahall be true to line and grade within allowable tolerances for concrete surfaces, mortartight end sufficiently rigid ar prevent objectionable deformation under load* Where forms for continuous surfaces are placed in fruccessive units, cure shall be taken to fit the forma over the completed sur face so as to obtain accurate alignment of tha surface and to prevent leakage of notnr. Responsibility for their ade quacy shall rest with the Contractor) however, the type, Shape, size, quality, and strength of all materials of which the forma are made shall be subject to specific approval of the Engineer, All forms shall be so constructed thQt they con be removed without damaging the concrete. All exposed, joints, edges, and external corners shall be chamfered to provide n neat and uniform appearance unless otherwise directed by the Engineer. F-15(2) Coating Farms for exposed surfaces shall bo coated with an approved nonstuining form oil which shall be applied shortly before the concrete is placed. After oiling, surplus oil on the form surfaces and any oil on the reinforcing steel or other surfaces requiring bond with the concrete shall be removed. Forms for unexposed surfaces may be thoroughly weitud in lieu of oiling immediately befor placing of concrete.JfB Removal of Fortnfl Forr-S Bhall ilgt he removed without prior approve! p£ Engineer and all removals shell be accomplished in & EmJiner which will prevent damage to concrete, Forms shall ngt be removed before the expiration of the minimum time indicated below. except as otherwise directed or specificully authorized. Slabs and conduit ■ 7 days Walla a 2 days F-16 TOLERANCbLJ\)_R_.COWCfiET£ CONSTRUCTION Variation in hllgmu&nt, grade and dimensions of the structures from the established alignments, grade and dimensions shown on the Drawings shall be within the tolerances Specified in the following table. 1) Variation from the plumb a) In tho lines and surfaces to) For exposed corners, joint groves and others 2) Variation from the level or from the grades indicated on the drawings 3) Footings a) Variation of dimensions in olan. In 3 metres....0.5cm In 6 metros 1 .Ocm In12 metres....2.0cm In 6 metres...,0.5cm In12 metres 1 .Ocm In 3 metres....0.5cm Minus........... .. .. ..1,0cm Plus........................ 5.0cmto jRaductiou in tbickrieaa any point b Minus ................... 2% of Specified thickness r 4) Conduit tt) Departure from established grade and level* b) Variation in thickness at any point. c) Variation from inside dimension. Total length...1.Ocra Minus .................. .0 cm Maxinnim ....... 1 % F-17 FIMI3HINC immediately after removal of forms, all unsightly ridges or lips shall te r&tnaved and undoci rat le locel buldging on the surfaces to be permanently exposed shall be remedied. Excessive rubbing of formed surfaces will not be permitted. Voids and holes left by the removal cf tierods in all permanently exposed surfaces and surfaces to be exposed to water shall be reamed and completely filled with dry patching mixed in the proportions directed. Defective concrote shall be repaired by cutting out the unsatisfactory material and placing new concrete which shall be secured with keys, dovetails or anchors. Concrete for Patching shall be drier than the usual mixture and shall be thoroughly tamped into place. All finishing shall be per formed iinmediutely after the forms are removed. All uw* iarmed surfaces of concrete that are not to be covered by 50 additional concrete or backfill, shall have c wood float finish unless a steel trowel finish is specified, without additional mortar and shall be true to elevation as shown on the Drawings. Cure shall be taken to flee that all free water which has accumulated at the surface is removed before making any finish* Every precaution shall be tcien by the Contractor to protect finished surfaces from steins or abrasions. Surfaces or edges likely to be damaged during the construction period shall be properly protected* The length of the template will be 1.5 m far testing of formed. Hurfacos and 3.0 m for testing of unformed surfacia. F-18 RSFAIR OF CONCRETE Concrete that is dar.aged from any cause; concrete that is honeycombed, fractured or otherwise defective; and concrete which, because of excessive surface depressions, must be excavated and build up tq bring the surface to the prescribed lines; shall be removed and replaced with drypeck, mortar, or concrete. Repair of concrete shall be performed only by skilled workmen and within 24 hours of removal of forma. ^11 fillings shall be bonded properly to the surfaces and ahull bo sound and free from shrinkage cracks and drumniy areas after the fillings have been Cured and have dried. Repairs shall be made in accordance with procedures approved by the Engineer* All materials used in the repair of concrete shall conform to the applicable requirements of this section of the specifications* Concrete, wartar and drypack filling shall each be mixed in proportions approved by the Engineer to produce a repair etleast51 equivalent in strength and durability to the concrete in which the repair is required. 1-19 PUBLISHING AND PLACING STEEL REINFORCEMENT F—19(1) General The Contractor shall furnish, cut, bend, and place all steel roinforcenent including rods, bare and Dtructural shapes ae indicated on the Drawings or otherwise required. All reinforcement she.ll be, when surrounding concrete is placed, free from looBe, flaky ruat, and scale, and free fora oil, grease or other coating which might destroy or reduce its bond with concrete. All placing shall be in accordance with Drawings furnished or as approved by the Engineer. F-19(21 Cutting and Bending Steel reinforcement may be cut and bent in the field. All bending shall be in accordance with standard approved practice and methods. F-19(3) Quality Tho steel reinforcement shell conform to the following requirementa. 0.) Reinforcement bars (rods) shall be deformed bars of intermediate grade billet steel in accordance with the ASTN Designation A-15-65, or equivalent, Yield point ■ 40,000’lbs/sq,inch Tensile strength » 701000 iba/sq*inch- 5? - b) Deformation of bare shall be in accordance with ASTM Designation A-305*65, F-19(4) Splicing All splicing in reinforcement shall be in accordance with ACT standard "Building Code Requirements far Reinforced Concrete," F-19(3) Supports All reinforcement shall be secured in place by use of metal or concrete supports, spacers or ties, us approved. Such supports shall be of sufficient strength to maintain the reinforcement in place throughout the concreting operation. The supports shall be used in such a manner that they will not be exposed or contribute in any way to the discolouration or deterioration of the concrete. F-20 EMBEDDED ITEMS Beforee placing concrete, care shall be taken to determine that nil embedded items are firmly and securely fastenened in place as indicated on the Drawings, Btabedded material shall be free from oil and other foreign matter such as loose coatinge of rust, paint or coalas* The cuibodding of wood and other foreign material in concrete ahull not be allowed.- 53 - F-E1 BLINDING LAYER [CONCRETE) Foundations of spillway shall be provided a conorete blinding layer as directed by the Engineer to achieve an approximately smooth surface before laying and binding of steel reinforcement, The eHtincited range of cement in this concrete shall he 200kg per cubic metre, P-22 DENTAL CONCRETE Dental concrete ehall be placed in dental excavation such as joints, fractures, crocks, fissures, packets and between rock beds. It shall also be 'rovided in other below grade excavations, F-23 MEASUREMENT AND PAYMENT a) Item No.401, Furnish Portland Cement (ordinnry) i) Measurement, Measurement for bagged cement will be made of the number of tans of bagged, cement acceptably used in the per manent works for which items for measurement and payment are included in the Bill of Quantities. The quantity to be paid for will be baaed on the number of bags and standard weight per bag as detemined by the Engineer of cement acceptably used at the mixer, ii) Payment. Payment will be made for the number of tons measured fifl provided above at the Contract unit price per ton for furnished Portland Cament (ordinary) which price shall include all costa associated with providing cement at the aiixer. No payment will be made for cement used as fol laws;- 54 - client used in concrete that la wested; cemEnt ubeiI in the replaCEREiit cf duoged or defective concrete! cement that is otherwise wasted; content used in extra concrete placed outside the concrete paylinaa, unlEBfl such extra concrete is required aa a result of written order of the Engineer; and cement used in concrete placed by the Contractor in excavation intentionally performed by the Contractor to facilitate his derations, hj ItEti No,402, Furnish end Inetall Reinforcing Steel i) !/ea rar Events, MbafUrement will be made of the number of frillo-gT-,\nft of reinforcing steal uGceptnbly placed on the buie of the lengths of baro installed in accordance with approved Drawings or bar schedules or ae directed, converted to weighta for the siae of bars listed by the use of unit weights per linear metre, Sisal in laps indicated on the Drawings or required by the Enginaer will be paid far at the Contract Unit Price, Mo measurement for payment will be made for the additional steel in laps which are authorized for the convenience of the Cont ma Ur. ii) Payment Phynwnt will ba made for the number of killo-grams “ensured us provided above at the applicable Contract unit priceB per killo-gram and shall constitVe full com-'easatiCB fo> furnishing, delivering, hulling, cutting, banding, cleaning, placing, binding and supporting the bars and &U worls related to the Iteiab- 155 c) Item Ho. 403, Furnish and Install Water Stop. 1) Measuresent Measurement will be made of the number of linear metres of water stops acceptably placed in th® work based on the applicable unit linear metre for materiel. In computing lengths no allowance will be made for laps. ii) Payment Payment will be made for the number of linear mo tree measured aa provided above nt the Contract unit price to furnish and install water stops, and shall include full compensation for splicing material and all other work related to the Item, d) Measurement and Payment of Concrete. General Except as otherwise specified hero^under, measurement of concrete will be made on the basis of actual volume of concrete in place within the neat lines of the structures ae indicated on the Drawings or as otherwise established by the Engineer. Measurement for payment will not be made of concrete, nor any ingredients including cement in conereto which is placed outside of the lines shown or. the Drawings, Measurement of concrete placed against the sides of any excavation without the uac of intervening forms will be made only within the pay ' lines of the structure, Unless otherwise specified payment for concrete will be made at the respective Contract Unit Prices per cubic metre for the various Items of the Bill of Quantities which price shall include the cost of all labour. F- 56 - materials, and the use of all equipment and tools required to complete the batching, mixing, transporting, placing, protecting, curing and other concrete work; except the cement) reinforcement, and embedded parts which are specified to be paid for separately. The Contract unit price per cubic metre for concrete will include the coat of formwork, form oils, aggregates, water, preparation of joints, joint fillers, specified Gleaning) preparation. of surface to receive concrete, finishing and all other work required to complete the concrete structures. No m&asijrement or payment for patching or repair- ing faulty concrete by any method will be made. The Items for the Concrete work are specified hereinafter. e) Item No. 206, 404, Dental Concrete. Dental concrete includes concrete required to be placed in the dam foundation, spillway, diversion structure, and intake structure as directed by the Engineer in accordance with the requirements of Clause F-22 Dental Concrete. i) Measurement Measurement will be made of the number of cubic metres of concrete acceptably plaaed us directed by the Engineer in dental excavation as specified above. 11} Payment Payment will be made for the number of cubic metres measured as provided above at the Contract Unit Price per Cubic metre for Dental Concrete, and shall constitute full compensation for all work related to the Item, +57 - f) Item No* 405j Blinding Concrete* Blinding concrete includes concrete nt thin limlte no directed by the Engineer, e^ce^t Dental Concrete. Payment Payment will be made for the number of cubic metres measured efl provided in Clause F-53(d) at tha Contract Unit Trice per Cubic metre for Blinding concrete and shall constitute full compensation for all work related to the Item in accordance with Clausa F-2i, f) Item No. 4O6 Plain Concrete. F Thia Item includes concrete In Approach channel of Diversion Structure and Approach channel of Intake Structure as shown on the Drawings* Payment. P yment will he made for the number of cubic a metrea measured as provided in Clause F-23(d) at the Contract Unit Price per cubic metre for concrete laid in pooition and shall constitute full payment for all work related to the Item. h) Item No. 407, Reinforced Concrete This Item includes concrete in Spillway, Diversion, and and Intake Struct urea as shcim on the Drawl age. Payment. Payment will be made for the number of cubic meters measured aa provided in Clause F-23 (d) at the Contract Unit Price uer cubic meter far concrete laid Ln.'the structures and shall constitute full payment for all work related to the Item,o1 ggOPS t valves, and other nriacalianeou* works connected with the s tructures, g-2 structuse drains 0-2(l) General Under drainage will be provided for the Spillway Structure downstream of the toe of downstream rock-fill zone of the dam along the aide wells of the chute as shown qn the Drawing* It will also be provided under the downstream tou of the dam a® shown on the relevant Drawings * G-* 2 ( 2* } Kn t erin 1 a a) Pipes* Concrete pipes of the internal diameter sizes as specified on the Drawings shall be uaed Each 58 - SECTION G KISC7.MJI NEO US This section cov&ra furnishing and installing of structural drain® Gates, Steel pipa for Intake Structure, t piece shall be JO cma long with straight ends and shall be laid dry, Pieces of pipe shall be laid keeping 3 to 4 ma apace between the ends. b) Material around the pipes* The material around the pipes shall consist of gravel clean and well graded from No. 4i U.S* standard sieve size to three quarter inch size, a» approved by the Engineer* ^-2(3) Installation a) Trenching Widths and depths of the trenches for drains shall be as indicated on the Drawings and where not indicated shall be of minimum width necessary for proper laying of pipe* Excavation for trenching ehall be performed by barring and wedging or any other approved method which will not damage th<? rock in the foundations.59 b) Pip? Inatallotion Esch pipe shall be carefully inspected befcre it is laid, Any defective er damaged pipe shall be rejected. ftiB laying of pipe shall proceed upgrade beginning at the lower end of the pipe line. Under no circumstances the pipe shall be laid in water and pipes shall not be laid when the trench ccnditicns are unsuitable for such Work, pull responsibility for dewatering of trenches during construction shall be born by the Contractor* Pipes shall be laid to the lines and grades as shown on the Drawings, When pipe laying is inter rupted the Contract or shall seal the ends of the pipe line tc prevent the entry of foreign matter* Nd backfill shall be placed aver or around the pipe untill the installation i& approved by the Engineer, c) Backfilling Before pipes are laid, graded gravel material as specified above shall be placed to tha depth 33 shown oil the Drawings or as directed by the Engineer Care shall be taker, to ensure thorough coepaction of the fill under the pipe, Material shall be placed along the side of the pipe in layers not exceeding 10cm in the depth and shall be compacted by hand tamping, 3-3 jiULKHEAL GATES AKD TRASH 3ACK 1} General The Contractor shall furnish, assemble, install and test the following:- a) Two bulkhead gates, one for Diversion structure and the other for Intake Structure; hoists; anchorage assembly, hoist stems Or chains, track bars, seals, sill and other e^boded items shown on the drawings find required for satisfactory operation cf gate.bl Trash rack including anchorage and arrangements required for satisfactory installation, 0-5(2} Material Specifications All material used shall be of highest grade, free frcjri defects and imp erf actions , all material shall be of recent manufacture and unused and of classiflc&tir and grade designated on the Drawings, The rubber seals for gates shall be moulded only, G-3(3) Workmanship, a) General Workmanship and finish shall be first class and equal to the best practice in modern fabrication and machine shops* Before laying out, cutting or fabricating the work in any way, tiio material shall be thoroughly straightened by methods that will not result in damage, exo op* that sharp klrk.i or bends in members to be str lightened will be cause for rejection* Finished members shall be free from kinks, bends, or winds, Shearing shall he accurately done, and all portions of the work neatly finished. Bends, except for minor details, shall be made by approved dies or bending rolls. Where heating is required, precautions shall be taken to avoid overheating the metal and it shall be allowed to cool in such a manner as not to destroy the original properties of the metal* Holes for drainage shall be provided in such horizontal or inclined members as may b? subject to retention of entrapped water, b) Dimensional Tolerances for Structural Works, i} Structural work fabricated under this Contract and delivered to the work site in sub-assemblies will have been fabricated to, and shall be asseftbled in accordance with the dimensional tolerances herein specified.- 67 ii) Unless otherwise specifically authorized the major dimensions of any 3truetore fabricated of structural steel shall be within 3 am of the dimensions shown on the Drawing. Dimensions shall be measured by means of an approved calibrated steel tape of the same temperature as the structure at the time of measurement. Unfairness of platework shall be held to a practicable minimum, c} Welding 1) All Weldins and work related thereto shall comply with the requirements of the American Welding Society or the ASHE Code as applicable to the equipment being welded* All welds shall be continuous unless otherwise approved by the Engineer and shall be made in such a manner thrt residual shrinkage stresses will be reduced to a minimum. il) Members to be joined by welding shall be cut accurately to size. The edges of the members shall be sheared, flame cut or machined to suit the type of welding. The cut surfaces shal1 expose sound metal free from defects. The surfaces of plates to be welded shall be free from ru3t, grease and other foreign matter for a distance of at least 2 ems back from the edge of the weld. ill) All welding shall be performed by the electric arc method, After being deposited, welds shall be cleaned of slag and shall show uniform sections, smootheness of weld metal, feather edges without overlap and freedom from porosity and clinkers. All pinholes, cracks and other defects shall be repaired by chipping or grinding the defects to sound metal and rewelding.-62- iv) Arc welding equipment shall be of a type approved by the Engineer that will produce proper voltage, amperages and polarity for all uses and positions for which the electrodes are suitable, Electrode shall conform to ASTM Designation A-23J or similar* d) Inspecting and Testing during Manufacture, The Engineer shall be entitled at all tines during aanufacturs to inspect, examine and test on the place of manufacture the materials and the workmanship of all equipment to be supplied under the Contract, Such examination or testing if made shall not release the Contractor from any obligation under the Contract, G-3(4} Installation a) General The Contractor shall assemble, install and te3t the bulk head gates including seals, track her, sill assembly and trash rack in accordance with the details shown on the Drawings or as directed by the Engineer, Seals and guide assemblies shall be installed to true vertical planes within tolerance of plus or minus 1,5am in over all height, or over all width as applicable, no deviation from straight line exceeding 1,0mm in any J. 00 metres length. The distance across bearing surface and seal plates shall be maintained to a tolerance not exceeding plus or minus 1.0mm from the dimension shown, After adjustment to the tolerance required assemblies shall be concreted in accordance with the applicable requirements of Section F, b) Erection Equipment and Supplies, The Contractor shall furnish all equipment including but net limited to, lifting and erecting devices and welding machines and supplies necessary far the errection of the gates and trash rack. The Contractor shall furnish temporary supports, blocking bracing, jacks, anchor bolts63 - and all similar items necessary for the support of equipment, The Contractor shall lubricate all parts requiring lubrication before operating any equipments PAINTING All metal surfaces except those to be embedded in concrete shall bo painted in accordance with the provisions of this clause or as directed by the Engineer* All painting and surface preparation work shall be carried out at the site. Surfaces to he painted that will be inaccessible after installation shall be completely painted prior to installation. All oil, grease, dirt and rust preventive compound shall be removed from the surfaces by the use of a suitable solvent and clean wiping meterial* Following the solvent cleaning, surfaces to be painted shall be cleaned of all rust, mill scale, dLrt and other foreign substances* Immediately after cleaning, the surfaces shall be given the first coat of priming paint. Surfaces of metal items which are not submerged in water shall be giver, one coat of priming paint and two coats of Aluminium finish paint. Structural steel and miscellaneous metal works that will be submerged in water shall be given two coats of Red Lead priming paint and two coats of phenotic resin Aluminium finish paint* No separate payment will be made for any of the painting of metal work performed under these Specifications and all costs therefor shall be included in the rate or amount tendered for the item to which the painting is appurtenant, INTAKE STRUCTURE STEEL ilPLS ANC VALVES G-5(1) Scope The work to be done under this item consists of providing and installing steel pipes, butterfly valves and other fittings complete as shown on the Drawings or as directed by the Engineer, G-5(2) Pipes a) All pips and fittings shall be fabricated, shop tested, delivered to the site, installed and tested in place. Pipe diameters, lengths of straight runs, special fittings, anchors, and- 63 - and all similar items necessary for the support of equipment* The Contractor shall lubricate all parts requiring lubrication before operating any equipment G-4 FAINTING All metal surfaces except those to be embedded in concrete shall be painted in accordance with the provisions of this clause or as directed by the Engineer, All painting and surface preparation work shall be carried out at the site. Surfaces to be painted that will be inaccessible after installation shall be completely painted prior to installation. All oil, grease, dirt and rust preventive compound shall be removed from the surfaces by the use of a suitable solvent and clean wiping meterial. Following the solvent cleaning, surfaces tD be painted shall be cleaned of all rust, mill scale, dirt and other foreign substances, Immediately after cleaning, the surfaces shall be- given the first coat of priming paint. Surfaces of metal iteos which are not submerged in water shall be given one coat of priming paint and two coats of Aluminium finish paint, structural steel and miscellaneous metal works that will be submerged in water shall be given two coats of Red Lead priming paint and two coats of phenotic resin Aluminium finish paint. No separate payment will be made for any of the painting of metal work performed under these Specifications and all costs therefor shall be included in the rate or amount tendered for the item tc which the painting is appurtenant. C'5 INTAKE STRUCTURE STEEL FIFES ANT VALVES 0-5(1) The work to be done under this item consists of G-5C 2)pertinent dimensions shall be as shewn on rhe Drawings, pipe and fittings shall be fabricated from steel plate in accordance with American Water Works Standard Specifications, b) Welding shall be performed as specified in clause C, and in accordance with Atfwft standards, c) The exposed steel pipe shall be painted as specified in Clause G-b, d) Materials, i) Steel plate for the Welded steel pipe and appurtenances, and for Welded steel plate special fittings shall confcfq to thE requirements of ASTM Designation A283, Grade E or equivalent. Any laminations or other defect? in the plates shall be cause for rejection whenever in the opinion of the Engineer such laminations or defects will impair the quality of the pipe, ii) All studs fcr steel flanges connections shall be threaded full length and shall be furnished each with two nuts for flang bolting. Studs shall be of such length that about 1*0 cm shall project through the nuts when drawn tight* ill) Gaskets for flanged joints shall be full face gaskets made of asbestos composition sheet packing* graphited both sides, C-5(3) Butterfly Valves Butterfly valves of size and of standard [manufacture shall be provided in the Pumphouse as shown on the Drawing, and having the following specifications: a) Butterfly valves shall be in accordance with *WA Specification C5M. The rubber s-eatsd* tight closing sha11-- . - 65 - c) Valve discs shall be constructed of alloy cast iron ASTM A436, class B with 14 percent nickel, 6 percent copper^ 2A percent chrcQiLo* d) Valve seats shall be natural rubber of the nculdad type cemented and clamped or bonded into the body for complete immovability under all operating conditions* e) Shaft bearings shall be self lubricating sleeve type of bronze construction impregnated with oil. f) Valves shall have canual operating oecbanisn having permanently lubricated totally enclosed gearing with head wheel diameter and gear ratio to require not over 40 pounds pull to ceet the torques required for- operating valves, Operating mechanism shall be equlped with hand-wheel, position1 indicator, and locking device* Hand-wheel shall turn counter-clockwise to open the valves. g) Valves shall be set plumb, A clear and cleanHandling and Transporting Pipe The Contractor shall take every precaution during loading, transportation, and unloading to prevent damage to the pipe. The pipe shall be handled only by means of approved hooks on the ends, or by aeons of belt slings. Trucks or trailers used for transportation of pipe shell be provided with padded bolsters curved to fit the outside of the pipe Pipe shall be supported on the ground in an approved manner. Any pipe section that becanes damaged shall be repaired as directed by the Engineer, if in his opinion a satisfactory repair can be made otherwise it shall be replaced with an undamaged section at the expense of the Contractor, G’5(5) Installation of Fabricated Steel Pipe. a) Just prior to Installing any section of pipe with field welded joints, all foreign matter of every nature shall be removed free the surfaces that are to be in contact at Joints, so as to leave thoroughly clean surfaces for metal to metal contact. Pipe trench shall be kept free of water at all times during pipe laying operations, b) Each section of the pipe shall be accurately laid to the required line and grade. In placing pipe in the trench, the pipe shall be held by the sling at the balancing point of the section. The longitudinal welded aeess shall be staggered with adjacent pipe sections. The Contractor shall make such excavation outside of the specified trench section as are needed for field welding. C) The pipe shall ba laid above the ground by supporting it on specially constructed steel bar pedestals. The supports shall be provided at Intervals as directed by the Engineer. The pipe shall he encased in reinforced cowrote ns show in the Drawings and as specified in sectionV *K= ir.il Vc friff -* ?,*<s ‘i.jp-e- ..' ;•*.-. i- -flf.-rt ri-j x :- -rit-.-i ■_■ ,-.i tr i*,'•? *7 - f " ■.k. :<4 Jcr V- Jtfjcfur^ irsiae, ■.- <>■» j- lir.c- ;►■*•, -r - ?r?»;ry?. Will b* Mldc tUjTt l^tfv .;; * f < r< - T; * ’. -■ fr* ■ Il) Fjjprer.t w-** -j--c-■ '■■■■■ = i ±-.-1» . z-. t£-» 1* .■■T -■ - Fnyttvfrt ’ »*»!•? ‘Ft<= t£ CftTr? flrrtfltXurf ’J /r—. ili! =". ?r; .- I er -,' . iw'fa f.:r* ’w : ►. t 1 - rust t ’1l JJ- tl-.s;: f.r CL iVAri r, 1 r <k ir, t il :ial ar. .];r=x’ -j ijml st- iTi.ir rt the ;i<-*» bjt Itrt Mota S32 MW $ ■. Drains» l'i'-i' ; Fj; r-: it tti-r ! -j-c prei* ml rf = < rrstad rdj «A4 F< e l! v • 3 - -T 1 fat . [ ^a-uJ-.F.cri’ Will £e w Hire* altty. MU'* llts LivCrt?^, fur csJ. 11: 5tj ■! ■ni 1 Vj iu =. Jiss. 5> tai, 535* imw 4; -4.-^ Sv-£*1] Measurement Ktasuremer.t b e f[lr thE 3ulJ( Gates at DivorsUn and Intake Structures accritobb provided and i according ti SpeclftcattMi in8 alled end Drawings u a separate droplet* unit for each of the Diversion and rntake Structures, ii) payment. Payment will be ntoe for each complete unit measured s provided above at the Contract unit price S per unit for Furnish, install and Test Bulk Seal Gates and shall constitute full compensation fcr manufacture, trensportaticn to the site, installation, testing af the pates including its accessories and all other works related to the rtem, dj Item Nd, 506. Furnish and Install Trash-rack at the Intake Structure. i) Measurement Measurement null be made for a Trash-rack acceptably provided and installed idcordlng to the Specific it tans and Drawings as a complete unit in the intake Structure, 11) Payment Payment will be male for a coapl&te unit measured as provided above at the Contract unit price per unit for Furnish and Install Trash-rack and shall constitute full conponsation for raanufacture, transportation to the site. and installation including painting and all other writs related to the Item, & ) item No, 507, Supply and Laying of 50 cm dia steal pipe for intake structure. i) Measurement Measurement will * «“■» in ll3'ar “etrM along the centre line of the pipe Iron Viet to the puira house acceptably supplied and installed as shorn on the Cravings er directed by the Ewrar.6? - ii) Payment Payment will be made for the number of linear metres of pipe as measured above at the Contract unit price per linear metre far supply and laying of pipe and shall include full compensation for supply, laying, installing of the specified steel pipe including fittings, anchors and all other works related to Item* f) Items Nos, 508, 509, 510 and 511. Supply and Install Bell mouth at inlet, and bifurcations and bends in the pump house* i) Measurement Measurement will be made for each Item of Beil mouth, bifurcations and bends acceptably provided and installed according to the Specification and Drawings 33 a separate complete unit* it) Payment* Payment will be made for each complete unit iDeasurcd as provided above at the Contract unit price per unit fcr Supply and Install and shall constitute full compensation for manufacture, transportation to site, installation including its accessories and all other works related to the I ten). g) Item Nos, 512 and 513* Furnish, Install and Test Butterfly Valves, i) Measurement Measurement will be made for the number of 50 cm and 30 cm diameter Butterfly Values acceptbly provided, installed and tested in the pump house of intake Structure, as provided in the Specifications and Drawing as a complete each unit U) PavuiRnt- 70 BILL OF.-QUANTITIES Dc-StripSion Unit Quantity Unit Rate Rlrr Total Anount Birr SECTION ^-MOBILIZATJQg Mobili&at-i on far Project Construction Sub-Total for Mobil SECTION C<-EI¥ERSIglf Afflj CARE OF River Diversion and Care of L’ator jjp^tream Cofferdam. Clearing and Stripping of foundation Ewth Excavation of fcLiridntion ftandotn Boe trill Zona Transition Eona rrnpervio^ tort zatlo i Ou. m H N 3000 1500 3010 1050 .1 own 3 tr ea Hi c 0 f r gr d am Clearing and Stripping of foundation "antloni Botkflll Zone impenrious E&ne lading <,f DownatrefiQ Cofferdam ^ping of Water frora Fn tin da dons &Q. ■ Cu« n 5LPS/Hr HO ?1 26 117 SOOhra, Su^Total for Diversion and Car© of water ^C~IIQX-D BMgjWATIQW a *r±aj ahd Stripping of r ^d.atifin^ ^th Excavation in ^^ati&na Excavation in iq. m Cu. m roy ndatlon9 55200 U2O0 2000071 ■ra No Description Unit Quantity Unit Rate Birr Total ul*DUnt Birr 4 Rock Excavation in f auibdJi lions 5 Surfneo Dontai Treatment of Foundation far Corn-Rock Contact-Dental Concrete Surface Dental Treatment upstream of corc-Dontnl Concrete Cu* m 4OJO tt It Sub - Total for Excavation SECTION E-CONSTRUCTION OF EjUITH AND ROCK FI] Main Daa Fill^ Riprap Slope Protection Cu< m Rockfill Zone 5770 7700 l_ J L Transitton Materia1 Zono 1 Ioporvlous Fill Zone (Clay core) Impervious Fill for cloy Blanket Mlace1Lanoous Ba ckfi11 H H II fl Sub-Total for Construct! on of Earl 8744 123500 28000 40000 128000 30000 th and Roc kflll ■ SECTION F-CONCRETE. PLAIN AND KETNt'ORCED Furniah Portland Cement {Ordinary Type-l) Furnish and Install Reinforcing Steel Furnish and Install Water Stop Dental Concrete in Spillvay, Diversion,, and Intake Structures foundations. Blinding Concroto under 5pillway chute slab, and under inlsts of Diversion and Intake Structures Tons Kg. DU Cu.m * 41 no 126630 390 40 190- 73 It ©Bi M o i Description Unit Quantity 1 Unit Re f a Birr Tots,! ' Amount Birr Plain concrete in Approach channels of Diversion and Intake Structures 40? Reinforced Concrete in Spillvny, Diversion and Intake Structures * 1 > Cu* m 150 - w Sub - Total for Concrete, ■Plain and SECTTON G-MISCELL.J4EDUS 1 Structure drains 1600 1 Reinforce d > ■ 501 Rock Ekcovation 502 Furnish and Install 15 ca concrete pipe drain 503 Furnish and Install 20 cm concrete pipe drain Bulk Heqd Gates >04* Furnish, install and teat Bulk Head Goto for Diversion Structure toj Furnish, install and test Built Hoad Geio for Intake Structure 06 Furniah and Install Tro-ih-rzlck at the Intake Structure Stud pipes for. Intaka Stbudy^a 07 Supply and Laying of 50 effi dia stool pipe. 38 Supply and Install, bell Jtouth at inlet >5 Supply and Install 50 cm bifurcation for by-pass 0 Supply and Install reduction blfuratlon to 30 cas# Cu. m 120 Lin, ra II II « J22 500 1 Per unit One »l 41 One •i it Oqu Lin. m *19,2 Per unit one ""1 One »i ii One73 ,--------------------------------------------------------------------------------------------------------------------------------------------------------- It era No Description Unit Quantity Unit Rate Birr Total Ainpunt Birr 511 512 513 1 Supply and Install JO cm bonds Furnish, install and tost jOcni, Butterfly tb!*» Furnishi install and teat JO cm. Butterfly valves Sub - Total for Mlsccllonoou^ GRAN3 TOTALt Tandor 1 Par unit IP !■ 2 One 2 Itomi ■ Price ■ I 1 i
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