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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. Copies 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~t an <br />automated system to minimize the development of hydraulic back pressure <br />within the leak detection system. This system is intended to deduce the <br />likelihood of compromising the secondary clay liner by intercepting 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 impact to <br />- BMG has committed to repair of the primary liner if <br />a leak is detected in letter of April 16, 1992. No <br />leak has been detected in the secondary clay liner. <br />(6) Cyanide Detection, Interception, Containment and Remedial Treatment: <br />BMG originally proposed the construction of a heap leach at the San Luis <br />mine. In 1988, BMG amended its permit application to delete th heap <br />leach and implement a contained vat processing system. This a nded <br />process was designed to yield detoxified tailings for disposal within the <br />tailings area. BMG replaced the originally proposed heap leach double <br />liner system with leak detection with a composite liner system ithout <br />leak detection. This amendment was approved by the Division relying upon <br />BMG's representation that tailings Cyanide levels would not exc ed 3.8 <br />ppm WAD Cyanide and 4.4 ppm total Cyanide. <br />In the absence of a leak detection system, migrating leakage from the <br />tailings disposal ponds would only be detected by the five grouted water <br />monitoring wells (M-5, M-6, M-7, M-8 and M-9) located in the vikinity of <br />the tailings area. Since the inception of the approved monitoring <br />program, only monitoring well M-9 has intercepted ground water. The <br />analytical results from samples collected from well M-9 have nojt detected <br />any Cyanide occurrence. <br />The Division directs BMG to reevaluate its approved program foreground <br />water monitoring, sampling and analysis for the tailings dispos 1 area. <br />At a minimum the Division believes that an expanded monitoring rogram, <br />including additional ground water monitoring wells, should be implemented <br />