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<br />1'agc 2 <br />Tnm Gillis <br />lln rch 11 , .I ~:R! <br /> <br />area. An nddit.ional slope failure i:: r_v.idunt to the immcrliatr_ west of <br />Scrliment Prmrl 114, below the proposed disposal :;itc. The ~ircas of instability <br />above Ihn diva.^•inn riilch appr~n' I:o L~~ loc.rfr•d ar•Iridr the !.,feral shear zones of <br />a large pr~~c•x i:vt inr! lands.lidr uarss. 'PAc~e ah:,crvations, cot rubora CCd by <br />inspections performed by CPILRD persoruwl, accentuate the irnportonce of <br />considering potential ne-tss movement hrzards in evaluating tho stability of any <br />surface facility at tare Orchard Vallr~~r mine. <br />L) summary, the Orchard Valley mine ::ite has been designated as a potential <br />geologic hazard, and that r7~•siynatiori has been substantiated Ly both aerial and <br />field examinations. hn light of the existence of potential geologic hazards, <br />it is appropriate that any surface facility desiyn and reclamation plan incorporate <br />a thorough 9eotechnic•a1 investigation. The regulatory agencies involved in <br />approving plancforsuch fac•ilitics t+rnrid Lc seriously remiss in their obligation <br />Co protect the health and safety of the citizens if they fa.i.led to require <br />thorouyh engineering desiyn .in Y.eel+iu~) with the current state-of-the art, as <br />would the applicant. <br />I briefly outlined what I consider to be an appropriate gc•ntechnical analysis <br />for the Orchard Valley waste 4ispnsol site in my memorandum of August~l2, 1980. <br />The following is nn elaboration ut tlnrt c-arlicr outline which takes into <br />consideratiwt the applicant's amendne,nts submitted since. that time. In my <br />opinion an appropriate 9eotechnical .u~algsis oC the proposed Orchard Valley <br />Coal Pro^_essiny Waste Rank site and structure should include: <br />1. A 9eotechnical investigation of the site and adjacent areas, including <br />a subsurface augerinq and rL~illi.ny prn9ram, determination of in-place material <br />densities, precise survey of the sit.: and critical slope sections, aero photogrammetri• <br />analysis, installation and monitorinrl of ground water monitoring wells, and <br />collection and analysis of appropriarr~ samples of bedrock,~colluvium and waste <br />material. <br />CWZ's arnendnd application cont:,ins examples of Lor.iny logs completed 6y <br />Lincoln-Di vote, inc. and 1'ox & Assoc_i.ites, Inc. If either consultant completed <br />a thorouyh .uralr(sis of the proposed .•ite, the results may comprise an adequate <br />sampling prnyrnm. <br />2. A thnrourlh dr•rc•ripliun of the r1•r•loyy ant! hydrology of the proposed dispo::a] <br />site., in~lu•lirnl mutcrinl crow.-ri•cti.ui profilrs and ground water Icvcl observations <br />pecfonncrl rl~rriny the site investigar inn. Geologic descriptions should incluc)c <br />m•~terial c].issificaCions, heddLrg an~r Fracture. orientation and frequency (RQD Index), <br />as well as nny obsorved mass movemen( artifacts, such as.slickensidiny. <br />C[/7 should include boring logs u! all bolts drilled during the investigation <br />of the propose.! .^,i tc. The amonderl .~!-1 ~.lica t.ion dues not include gray site specific <br />9eo1o9y ur hydrology/y for the propos•••/ rlispos.rl siCe. <br />(cunL'dl <br />.~. <br />