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<br />Battle Mountain Gold <br />NOPV Abatement Requirements <br />page 3 <br />- In partial response to Stipulation #1 on R-004, <br />BMG submitted a technical revision applic tion <br />proposing an additional Hydrogen Peroxide tailings <br />treatment (TR-007) on May 26, 1992. Copi s will be <br />provided to the Parties for comment. <br />(5) Leak Detection System Effluent Containment: <br />In the event that fluid is intercepted by the tailings fluid c llection <br />pond liner leak detection system, BMG shall design and impleme tan <br />automated system to minimize the development of hydraulic back pressure <br />within the leak detection system. This system is intended to educe the <br />likelihood of compromising the secondary clay liner by interce ting and <br />withdrawing leakage. <br />In the event that C <br />effluent, BMG shall <br />all effluent to the <br />the environment. <br />Status: Satisfied <br />yanide is detected within the leak detectio~ system <br />design and implement a containment system o return <br />tailings impoundment, in order to prevent mpact to <br />- BMG has committed to repair of the primar liner if <br />a leak is detected in letter of April 16, 1992. Nc <br />leak has been detected in the secondary c ay liner. <br />(6) Cyanide Detection, Interception, Containment and Remedial Trea~ment: <br />BMG originally proposed the construction of a heap leach at th San Luis <br />mine. In 1988, BMG amended its permit application to delete t e heap <br />leach and implement a contained vat processing system. This a ended <br />process was designed to yield detoxified tailings for disposal within the <br />tailings area. BMG replaced the originally proposed heap leac double <br />liner system with leak detection with a composite liner system without <br />leak detection. This amendment was approved by the Division r lying upon <br />BMG's representation that tailings Cyanide levels would not ex eed 3.8 <br />ppm WAD Cyanide and 4.4 ppm total Cyanide. <br />In the absence of a leak detection system, migrating leakage f om the <br />tailings disposal ponds would only be detected by the five gro nd water <br />monitoring wells (M-S, M-6, M-7, M-8 and M-9> located in the v cinity of <br />the tailings area. Since the inception of the approved monito inq <br />program, only monitoring well M-9 has intercepted ground water The <br />analytical results from samples collected from well M-9 have n t detected <br />any Cyanide occurrence. <br />The Division directs BMG to reevaluate its approved program fo~ ground <br />water monitoring, sampling and analysis for the tailings dispo al area. <br />At a minimum the Division believes that an expanded monitoring program, <br />including additional ground water monitoring wells, should be implemented <br />