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<br />carol Russell -_- J.:r,ucn} 2l , 7922 <br />compliance witl; ttre apnlicablo porforn:..~,%~ stam.;nls of 7~uic d. i"hc~ a~o1.i- <br />cant should descr_'be for ~/.hi%', portions of t!.e rrit each temnoran; c;erburdcn <br />st:.cl:pile .ill be ;:erstructed. 7n addition, t.hc applicant sl~culc' riescribe <br />haw the material o-rill be Cransported and placed ir: egch ~emperaru stockpile, <br />and what dimensions and slope an.ales those stocl•pilas :Dill attain. <br />Cverbarden - Post-Mininy Tcnnaraplul <br />Phe overaZ?. swell factor riiil de[arminc tl:e relation cf pre--mining and nost- <br />mining tol:ographies. The 25 foot contour interval used in prepar`ng t^e <br />post-mininy topoyraphy map No. _., ma}:es it imvossi.ble to a•legvately compare <br />rte-mi piny and rust-mi ni.ny to,nographi es prcpos ed foz the .^ine area. hlap <br />A%o. 23 should be aTrcnded to portray Dos t-runi nu tcnograpny utilizing a <br />5 loot contour interval, identical to that of lift- pre-min-~~y toooyranhic <br />man. <br />The applicant should quantify the post-mining ccpcyr~:pcy changes i/hich r;ii1 <br />result from the overburden s:,re11 and srpil moveaent_ The ::rocs-sa~ticns <br />included in the application indicate a ganeral bull:ina, .in l:e-nine with the <br />?~octed 17`5 overal_' sr/ell, but the apnlicatio:; does not quantify the pro- <br />?r_li:tiny. T:~e applicant should proj_~ct =peciSic r-iscs in ^lavation and <br />t_~ - .., .. ;,?,,-;a::y effects cpon cr.it.ical areas, sue;, ..., ,zones o` transition along <br />pit boundaries ant?'steep .slope areas. <br />On page 2.0>-10 of the apnli ca ti on, the ap.;L cant state.; EF.C !?i ^cr~ls, ?nc. <br />plans to bacl;fill, crac'e and roest.'rb1`sh the drain.:.7c betr:cea the n/o planned <br />areas of raining s,'rorm on .'1an ?~, 1%ine Pltrn. Ti:is area had been previously <br />Wined by surface methods an~i ..~.. abauloncd." 'll:is _., a Laudable ccmmit.ment, but <br />more detail re~~rriiny its implementation n•i~7 .'.» regc'rcr7. itthat vo'umos or <br />material :/i11 be introduced into this reostabZis~-~d area? ao:/ rail' it be <br />places? Ir. r/!tat configurations ..nd ~._ :ghat siane :: r.yies r:dll 'C Lc placed? <br />In short, mill it Ue erocionaLiy an ; structurai:.u stables? 'this ,:ercerr., ante <br />again, relates tc tire mass balance projections tier overnvr;?en move::.=.ot <br />refarenced above. <br />Figuz'e 2.05-8, third step, indicates scaematically tha[ ~nciZi^y o: backsill <br />material r,ray occur des/nslope from the contour stri.nri;:cf nit. This is <br />expressly diselloc,~ed by Fuie -,.27.3(1). Tha r2tt~r.tion o~ ~_ "loo-i wsi= barrier" <br />shown schematically on Firure 3.C5-8, is a desirable tochrSyue to ne implemented <br />to increase 1;acY.fi11 stabi li.tn of the con tour n_t. <br />Steep 51ope :~1inina <br />It ar~.pc.ars, crom esa^cna~tion of tiro maps; included in ti;n .rppLcation anal from <br />the Statement included in page 2.03-L1, that s=esn slope tin_ng conditions mi11 <br />be encountered during several proposed r^_ninq sog,rents. The applicant should <br />indicate on a men those areas mhi.ch exceod the threshold 20o slope graiient. <br />In these areas the appliicant must demorstrat^, tiu'ougth the preparation cf an <br />acceptable stat~ility analysis, that the rear-tired f-nat. static slope safety <br />:actor of _.3 uiZ1 ire achieved by tho ?;acs:filled Icpe. rr. many instances <br />in steep s1o_^e situations, sixple backfillinq ~to aaprcr.imate original contour <br />r/i11 not achieve the ref; ui red degree of r;lopo st,.Li li.ty, necessi tatin.:1 the <br />acquiring of appropriate variances or special technique utilization. .Zf <br />