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l;.J l J l_ 1 r 1 1 ~~ ... r r r <br />Grotechnir.al Emm~ccrinq anN i~,l.itenals Testing <br />r .'1 r. -~ f ='~ C~7 }.-1 r•'~1 r~ I ~ r~7 .1 r.n !:'~ <br />a't m'r I~ ~. rs. ( rl a 1 .7V <br />~G~v ~rsJu rJu ~ 1'~u L~~~, ilk ~;'~-~^ <br />biay 6, 1980 <br />Intermountain Technical Services <br />P.O. Box 3376 <br />Grand Junction, Colorado 81502 <br />Attn: blerritt Dismant <br />Re: East and SYest bline Diversions and East bfine Sediment Pond <br />Hydrologic and .Hydraulic Computation Revielcs and Design <br />Recommendations, fYestern Slope Carbon, Job 13-3 <br />Dear blerritt, <br />Ne have reviewed and checked the calctlations and design <br />recommendations for the referenced diversions and sediment <br />pond at the ltiestern Slope Carbon mine at Somerset, Colorado. <br />Our com^~ents ^nd calculations are includad on the sheets you <br />provided. As you will note by revieleing the attached sheets, <br />the only change we recommend is that the sediment pond be <br />sized to contain 0.25 ACRE-FT.rather than 0.21 ACRE-FT.(based <br />on the assumed total pond volume of 0.5 ACRE-FT) with a <br />minimum discharge pump capacity of 600 GPbi. <br />If you have any questions concerning the above, please call. <br />Very Truly Yours, ~ <br />G//E~~O T~~ESTING/L~ABORATORIES, INC, <br />Andrew A. Porter P.E. <br />President <br />~~~LS~~r <br />~/ r <br />,a <br />MAY 1 2 19t <br />• ~'cSTERN SLOPE CARBO;~, . <br />P,O. Box 3142. 3224 Fliglr~v~y 6 & 24, No. 3 • Grand Junction, Colorado 81502. 303 - 4349873 <br />