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~-19~fi-~~~ TR-G4 <br />Adequacy - MST <br />11-yep-~~~9 <br />Page ~ of ~ <br />The last sentence of the second paragraph an Page 4 refers to "the following Lambert <br />Associates report." According to page Valume includes three Lambert reports. <br />.~~~ase s~~afy to ~v~i~~ Lam~~r~ report is refer~en~~d here. <br />. The fourth paragraph on Pale 4 includes details regarding topsoil and coverfill quantities <br />salvaged .for the w~A-~. ~~ease pro~~de si~n~~ar de~ai~~ for ~IWD~-4 ~~e f ih <br />par~arap~. <br />7. In the first paragraph of Page 1 the reader is referred to the overnber ~~~3 Lambert <br />Associates study. Pease r~oa~~y t~s paragraph ~o r~eferer~ce "vario~s~'~eo~ochnica~ <br />s~~di~s f~~~o~vi~ tl~e se~~~or~. <br />. has been designed with the lntentlan Qf f1rSt exCavatlrtg native sally In order <br />to create an available area for placement of the coal mine waste. The ~ucl~harn eatech <br />report dated February 1, 207 evaluated overall excavation slapes of~.H:1V and <br />~H:1V~ These slapes resulted in acceptable upper waste fill slapes of ~.5H:1V and <br />3H:1 V, respective]y page parag~aph~. The May ~4~9 Buckhorn eotech report <br />steepens the acceptable excavation slaps assuming a 3; ~ upper waste fill slaps cf <br />~H: l V} from ~H: l V to 1.3H:1'V. Presumably it is this steepening of the acceptable <br />excavation slaps that accounts for much of the potential increase in the valurrle of <br />MwDA~4. eetian D-D' ofolume Figure 1 illustrates the relative laeatiens afthe <br />anginal ground surface and the prapcsed ground surface. N~issing from this ectian is a <br />line showing the proposed excavation surface. ~~ease r~v~~y Seot~o~ ~o represer~~ <br />~~e approxiraa~e ~i~~s of excava~~o~ that huve~roce~ed or are expected ~a precede the <br />p~acetner~~ of ~oa~ ~r~~ ~as~e i~ 1111~V~A-4. <br />. The map view of alums I Figure l seems to indicate that the northern portion of <br />MwDA-1 has effectively been absorbed into 1V~wDA-4. ~'"~is aid other ~c~~ia~ed <br />cha~~~s s~ou~d be re'ec~ed i~ Vo~~r~ I ~ o~ f ~~a~ p~r~~ni~. <br />This concludes my ectechnical Adequacy ~evie~v of TR-~4. Please do not hesitate to contact <br />rrie ~Vlth any ~ddltlanal questions that n1~~ arise, <br />~C: ar~dy Brawn, <br />