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CC8V Go 1 d Mng . Co . _ ID•9-689-4040 JUN 1~5 20 ~ 26 No .012 P .05 May 1A, 1995 -2- 943-2817 The response levels or ALR's for•the Cresson Project have boen previously identified az follows: Low Volume 5olutlon Calleetion l•'ill Plow Rnte less than SO Dercrnt ezaerdaace SO percent to 10 percent acceedance Action Pump collected leachau Increase LVSCS measurement from wakty to daily lntervalt and roptdr any observed liner detaege 10 ptmttt m 2 percent exaeedonee above 2 ptmat exceedmce UNER LF.AKAdE EVALliA710N Advise DMO of the LVSCS pump rate and improve wetar matragattreat to redone flowmm Advise the DMG and reduce rise LVSC6 Ilowrata through the following meeautc+: • reduu htxd on liner; • plot tt+te ofLVSCS flownu vaeut eoludoa c4vatioa; • none when LVSCS flowrare lbllt within eacptable envelope; and • maintalu solutioa levels within acceptable limits durioR all periods of opatatioa A probablllstic antlysis waz next performed using the Frtce1 add-0n program Crystal Ball. 'Ihe Qyswl Bell propjam urea aimuJetlao w model the full rngge of possible values and measures tfre liloellhood of navnimce for each possible value. Repaldve Moms Carlo sampling of the distribuliont for the heed and defect ¢n;a war performed. It war aatumcd that tha dcfecl diamcta would follow a normal distribution. The head war modeled u ^ trittaguLt tlistnbutioa for vari0ut dcplhs. 77tcrrbY, the disbtbtttioa for tha defect arcs and haed was incatporatcd into Equation (1] to tlttumittc me probahliry distribution for lino leakages Yen 2yl (!990) esrimated due ddcct siao may have a eecfficiatt of variotion of SO petcrnc Defxts ware modeled with a normal distribution for an avenge dituncur of 2 mm and a sW lord dcvintion of 1 tnm. One defter was assipted per sae of gwmembtane. In tha event of that a 8acdon of a defect was cslculeted, the number of delbus west rounded W to the next inta;ea• vslpe. The elevation veKUS geoembrrae tut2fte eves was provided by the Cripple Creel• & Vfcur Gold Mining Company (CCdcV ), Thb fnformadon lc preseared in fable 1. CONCLUSION The results of this investigation vary from the origitrel analysis perfoted by polder (1994) for Ibt followiag roosoaa: • The gcomrarbreac audece arcs used In [hc wlculatloos reflects the octual surf¢cc aro¢ versus elevation for the Phases i t'regnant Pond geomcnbrane after construction; • Flow was calNlated based on cakulattaZ the head on a defect for discreot sections. The Pregasnt Pmtd wns dlvtded faro 14 latervalt, each correspoadlnr roughly equal to l sae of geomembaane Brea, The provloue aaalysu aced ao aveta."e head over dte eneiro Preonanr Pond; and • Flow was calculated based on ea Integu value of defects. Golder Assoelntes fut.