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i <br />OF°ARTV.ENT OF NATURAL RcSOURCES III IIIIIIIIIIIII III <br />p r,:nn;p Pa ;rrt E'. r•r;il~.r ,~.ir yr~r <br />G?/iG~~~ L,-~Gi~ F3~ar'-; ~~~l~~f'~'~i€3:~a ~Gi?g~i~;~ <br />UAVID C. SHELTOII Director <br />f'.~awr:r D La~,~^ <br />,l woman Jan uaru 26, 1992 <br />TO: Carol P.vsseil <br /> <br />~~ \ Y <br />~~ ~ r <br />FROid: Jim Pend lets,-. ~.L ~•= -- ~-+• <br />-. <br />kE: Geotec:':nical_~fispects of the GEC Permanent Progzam Ferrn.it zn;•_ication <br />Pursuant tc your request, I ha ac reviec~:ed th= geotechrical a;pccts of *_he <br />GEC permanent program permit arplication. In yer.~=r..?, tir~~r.ppl:c~tion fails <br />to pro;,ide sefficier.t de tail :; i i-h smic'; tc allow t:he ce.mpletion or .`indines <br />for the various geotechnical issues. I forwaa? tl;e following specific <br />torments for your consideration. <br />Overburdc: - S[,,e11 Factor <br />The ap.plica:,t states nn page 2.CS-23 of the annl_c-.tion brat an overburden swell <br />factor of 3G`s is curz:entlu being encountered. The application c~^tir,ues; <br />"when pla;;cci in the backfiIl ~rca, approzimatelu 90°~ com~nction is c': t inert. <br />Thus yielding an overal~ swell factor is the bac}:r;:l.i .-:rea cr app_~a~imatelu <br />_'%~. <br />The applican* should a~ienrl ti:i:: portion of the application to -nc.'ude verir`ication. <br />of the 3Co eisen-ed swe_'1 factor for overburden. Scr-~ a;:ce;aed technique, sue; <br />as surveyed ~onp.-prison o_` pre-.mining and post-:rini.nc' topo;~raniiy o` ~ preciously <br />mine.: area, or systematic pze-mining an:? post-rcir:inc; der,sitrl comparisons, <br />should be utilized in performing this re.TOnstrat:on. :'anther, the applicant <br />should prc:ide 7a ore detai_' in ender to e'ucidate the projected transition free <br />3Co inherent overburden si:~e11 to i7% overall baci:fill buP:ing. I assume this <br />projection; involved ~stracticn of coal and the correction _'~or projected <br />compaction o` the overburden after ,q l.acerne nt in the nit. f'inaily, t;'e <br />applicant should oua_'ify t.hr=. .host-mirir.u rariatic,:, Yrc.s ~.ze-raining tupograr.hy, <br />[•inicn :;ill result frog t::e prciec_ed c•.•'r;'.1 -:;a_1 of backfilied ova-~bvrden. <br />This eiercise eii11 alloy the applicant to nre;)are a .rnss balance projection <br />for ,carious portions of the proposed pit. <br />Overburden - 'lempora ry Stoc};piles <br />The application states that in-: ti a1 pit over`,u_dcn sno_'1 :~i.i11 he p'xcod ir. a <br />temporary overburden stocF_pile. P1ap Aro. i. ~:r:^ic-,tas no 'c.~s than .. "temporary <br />stocvni'_es". The applicant s;i.~ulu clar~zn the pro;ascd .;tor.:ge of overburden <br />materials. :a amended in Aunust of 79~', Rule .%5.3(0, :en ui res th.rt tl:e <br />applicant provic.'e ...location, geo,r~tr_r, an.9 rretno•i o` :^ateual ~lscement."... <br />for each prcnosed temporary overburden stoc}:p.ile, in orrler tn -lemonstrate <br />4?? Cente~ .•t: Ran.,,n, ,?~.. ,.Y ~. ..-~ S; - - - .. -_.,, T_ c. .:.-- <br />