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<br /> <br />Bruce Humphries -2- May 30, 1995 <br />. .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. .. . .. . . . .. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . <br />(10)(30) Contaminated fluids from the leak detection system trenches and sumps <br />shall be disposed of as follows: Up to ten gallons per minute of effluent <br />collected from the leak detection system may be introduced into the heap <br />leach solution circuit. All fluids introduced from the leak detection system <br />into the heap leach solution circuit shall be inventoried using appropriate <br />metering and recording procedures. The fluid volume introduced into the <br />heap leach shall be reported to the Office in writing once a month. The <br />permittee shall develop a plan to adjust the heap leach fluid inventory <br />(water balance) so as to maintain the saturated level below the 80 percent <br />level. No contaminated fluid collected from the leak detection system over <br />and above the calculated rate of 1.0 gpd per acre shall be introduced into <br />the heap leach until this plan has been approved by the Office. <br />(11)(31) In the event that any fluid is encountered in the leak detection system that <br />exceed •5 mg/I WAD cyanide, the frequency of monitoring in wells <br />surrounding the heap leach shall be increased to weekly monitoring. The <br />permittee shall inform the Office within 24 hours following the detection <br />of fluid in the leak detection system that exceed the allowable leakage rate. <br />The permittee shall submit a plan for increased monitoring to the Office <br />within one week from the time the fluid is first detected. <br />(16)(36) All underdrain fill materials must be durable and chemically inert, and <br />must meet the gradation defined in the technical specifications. If any <br />underdrain fill materials or soil liner materials that have been placed show <br />that they exceed the.5 mg11 WAD cyanide by the ongoing or future <br />geochemical evaluations acceptable to the Office, submit a plan that shows <br />in detail how the leachates from the soil liner will be disposed which rnUSi <br />meet! all the applicable water quality requirements. <br />M:\OSSamm\Ch anges.bk <br />