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t:91d Hill Mill AAea,tae!v Rnvi~u x.......,.e ~y 2 1995 <br /> Mhrlramn WWII Width Mazlmam Fbw <br /> Depth Lett RIgM Slope Fbw Daptb <br />Dgrh Nurbsr Rerari (feet) (fool) (tied (lTJftl (CFSI (1'eM! <br />t 1 1.0 0.75 0.75 0.040 1.53 0.6$ <br />I 2 1.0 0.75 0.73 0.140 1.53 0,66 <br />2 1 1.0 0.73 0.73 0.027 0.13 0.36 <br />3 1 I.0 0.75 0.75 0.021 0.33 0.63 <br />3 2 S.0 0,75 0.75 0.123 0.33 0.45 <br />c) Ted Zurich Associates did not certify the diversion ditches above the teilirrgs impoundmrnt <br />24. e) COM, Ino. does not believe that a 24 inch capillary barrier is cost effective or necessary. According to <br />David Todd Ph.D., pLOfCS50r Of CIVIL Eit~leefing At rite vlarGlaliY Vf CalrfVUtn+,1>rr'keley, vt leis twuk <br />Grarmdwater HvdroloQV. "dre rapipary wne extends hum water mble up to the limit of capillary rise of <br />waster. Several investigators have studied the rise end drstsibution of water in the Capillary zrnte in terms <br />of the propertiaa of porous media. The eapiUary tine tettges from a haction of azr inch in gravel to as <br />much as a foot in send^. The etTectivenesa of "welt graded tack" u a capillary beraer is only in the <br />range of a haction of an itch to an irxh. Because of thin limited usefulness of the gravel as a capillary <br />battier, we only propose ro put on 2-inches of'tvci graded rack" fax reclartradon as a capillary hastier. <br />b) COM, Inc. will Commit to the vutalletion of a layer of geotextilc Dbrc over the tailing stuface before the <br />rock is placed. COM, Inc. owns enough geotextde rubric to cover the tailings and will afore the fabric in <br />Crc mill for reclaznatiar. Installation cost will be added to the reclamation cost estimate. <br />23. The Division is correct that groundwater Qow fates cannot be determined from the elevation information <br />taken farm the Bureau of Mines walla. We do not believe that anything useful would be determined by <br />doing pump testa on the welts to detemtine flow rates. The water table variations are influenced by seasonal <br />variations in the $actt>rad granite that hoe very low water storege capacity. 'Ihe Cold Hig mill wilt continue <br />to monitor and report pertinent water quality parameters even though the continued sampling of water has <br />shown no degradation in water quality. <br />26. COM, Inc. will set up a monitoring program for the Gold Hill MiU with a file located at the mine and a copy <br />sent to the Division yearly in the Annual Report. The following parameters unit be monitored and repotted <br />to the Division: <br />n) Groundwater quality and water table ekwtion <br />bl W stet level and available storage capacity in undetgrcund <br />storegereservoin <br />c) Undergrottnd wars storage btrOdread stability <br />d} Functiandity of the taiings decant pipes <br />e) Tailings impoundment $eebaard, water balance, stability <br />of the embatrkmatt, security, end linter integrity. <br />t) T.ilings line from mill to impoundment to assure it is not <br />kaking <br />g) Observations for leitldng tanks in trail( bttikirtg and other <br />conOtuunent fealitia <br />h) t7baerve LeR Hand Creek water line for leaks <br />QrurteriY <br />Q~IY <br />Qaattet'lY <br />Monddy <br />Ono per month while idle <br />Weekty when operating <br />Daily when operating <br />No cheeks when idk <br />Once per month what idle <br />Once per day when operating <br />Once per wcek when operating <br />No checks when idk <br />_~ <br />