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OCT-Ofi-99 IO:ZOAM <br />~~ <br />G <br />MCCullzy <br />E-rlGk $c <br />Gllrt-lon .r-_ <br />FROI~IAcCULLEY~OI L1lAN <br />pro~rarng onvlronmenrol <br />CGnSUlilfl9 ontl <br />9ngln09hng a6rviCdS <br />3034471836 M <br />MEMORANDUM <br />7-991 P.02/04 F-071 <br />a900 Padn [:dsr Cnci~ <br />Sulfa i(7UW <br />r)OUIOef. COIOlUCV ~:~ 1 <br />3073/aai-In2~ <br />Fa. aa7-IbbC <br />MFG PROJECT: 5461.1 <br />TO: Allen Sorenson -State of Colorado, Division of Mtnerals and Geology <br />Carl Mount - State of Colorado, Division of Minerals and Geology <br />Chris[ina Kamnikar -State of Colorado, Division ~f Mines and Geology <br />CC: Maxine Stewart -ITEC <br />Willy Hamlin -ITEC <br />FROM: Jon Friedman - MF G <br />DATE: October 8, 1998 <br />SUBJECT: DESIGN MODIFICATION, CASH MINE/hIII.L, TAILINGS ST'OItAGE <br />POND <br />!n light of [he conditions encountered during the tailings pond excavation, we are proposing a minor <br />modification to titt tie-in of the new 60 mil-HDPE flexible membrane liner (FML) to the old FML. <br />The original design called for thr FML's to be anchored in an anchor trench as illustrated on Derail <br />4, Drawing No- 5461-C5. This detail has been reproduced and appears as Figure 1 of tk::~ me:r.~. <br />The interim berm, in which [he anchor trench would be located, i; coinprtsed of approxintateiy i': - <br />90 % rock wittch would create very difficult excavation conditions. The proposed ctlattgt would have <br />the two FML's tied together by a heat fusion weld with out the anchor trench. This seam will be <br />further stabilized with a line of sand bags on both sides of the seam. This is illustrated in Figure 2 of <br />this memo. <br />The continuation of the new fi0 mil FML, which wi11 be placed over a portion of the existing tailing <br />and on the new rmbankmen[ slope, will be [led in[o the previously placed 60 mil FML wilt either an <br />extrusion weld or a Euston weld, Figure 3. The new 60 mil FML that will be placed over [he ensting <br />tailings and up the new embankment slope will be deployed once the organics and a portion of the <br />tailings have been removed. <br />!f you have any question regarding this design modification please due not hesitate [o call me at (303) <br />447-1823. <br />J W61~DrfGIO-sMEM+pG <br />g~ <br />MOUQ•+t~Q..e. NM • Asln TX • tiosron. MA . BO..IOBr CQ • MIaaJ•A~. Mr • POrt mvoCL. T)(• 70r ~.,OnOnC;... CA • i•aCRly wn • wcnoo:. ~D :,~ <br />