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<br />1'n qr• 4 <br />Tom G i l l i ~; <br />Ala rc'h 1. (, I `7171 <br /> <br />G . A qcm •ra 1 pl.ur and dct..r i 1 crl enq i uecri n9 design of the proposed Coal <br />1'rocess.ing Was Le lt;urk, in accordanc•• with Ru.ics 4.09, •1.10 ,-end 4.11 of Colorado <br />('crmancnt Fror(rnn, includinrl: <br />(a) 1'rep,rratiun of Clru founrlati•,na1 arrn, inc•.ludiny: Water control <br />meo:urns For yruunrl w:rtnr (.insl.rl(ation of requirr'd subdrain::) and surface <br />rlrainn;IC /Rules 4.09.2(2), (S) and (7) and 4.IO.J1: removal and stocl:pilling <br />of orrlanic material and topsoil (RU2c 9.09.4]; and installation of <br />keyways or buttresses, if appropriate IRulc 4.09(10)). <br />CWI's amcnrL•vl application indic•~tcs thaC exploratory drilling has <br />detetminc•d that. no deleterious subsurr-ace water exists within the proposed <br />waste dispasal'site. Doring logs an~i ground water monitoring should be <br />presented to verify the opinion prc:;~nted. Reference is a1e;o made to "a built <br />up berm on the outside sirlc thaC hell~~: trap .innucr/iatc sediment anr7 to Case the <br />unloadiny of was(c materials." Such design concepts must Lc clarified.and <br />included in the design plans to a11ni+ determination of conformance with design <br />requirements. The application also ~rbscrves that uo kcywayr, or buttresses arc <br />necessary L-•c~ru:c tho staLilit:y of tLe structure is adequate. Rule 4,09(1D) <br />requires buttrr~sses or keyways in pi.(,~s placed upon slopes steeper than 1v:2.8h <br />(J6%). If th<~ applicant w.ishos to u(ilize an alternative specification, a <br />thorough jurCificaCion must I;o presented, in accordanc•r. with Ru.1e 4.09.I(3). <br />(h) Placement and compaction nF waste material (Rule 9.10.4). <br />The matcrial..lift thicknesses o(~ 2 feet maximum and compaction specifications <br />of 900 of maximum dry density as den:rminer7 in accord with f1:1511TO Specification <br />IiT99-74 satisfy the rerluircmcnts of (:ule 4.10.4. <br />(c) Sur(~rco_ confi9urnl:ion of tl,~~ Coal Prncessiny Waste 71an1: (Rules <br />4.09.2(4) and (6) and 4.14.2(2)1. <br />The terraced configuration cont~iined in the CW1 amended application <br />conforms with the requirements of Rule 4.14.2(2). <br />(d) 9'npsoi.liuD and rov['getatiun of the waste hank and disposal area <br />(Role 4.10.1 (4) 1. <br />ThC am~rrvlerl application's propn~:~ l placement of 15 to 2.1 inches of best <br />av.+ilaLlc ni•rtrri;J rlon:, not ~cati ,Cy the rcrluiremcnls of Ihilc •9.10.9(9). Zf <br />the: applicant wisher, Co rc•qucsl a var i.rnc•e from the rniuinmm requirement of <br />4 feet oC norrtoxic• cover, the applir:rtion must contain such a request prepared <br />in conformance r.'ith Rule 4.10.9(4). <br />(e) An in,rl.•etion and c•crtif.icnl ion schedule in confonnanee faith Rules 4.10.2 <br />and 4.09.1 (11) . <br />Thr, amr: nrlcd ~rl,plica ti nn sulnni Clrrl by CWI r/nrn: r..rti~:ly Lln• iu~: pr.•ction and <br />certification schr_~drrle requirements of Rulc:~ -0.1U.2 and 4.09.1(11). <br />(r•nnr 'dl <br />