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<br /> <br /> <br /> <br />1 <br /> <br />1 <br />1 <br />1 <br /> <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />GROUND WATER CONTAINMENT AND REMEDIATION PLAN <br />Pursuant to Abatement Requirement No. 6, Battle Momitain submitted a report entitled <br />Proposed Modifica[ions to the Ground Water Moaritoting Plan, San Luis Gold Pro3ect, Costilla <br />County, Colorado", dated May 1992, which was submitted to the CMLRD on Mhy 29, 1992. <br />That document proposes tl~e installation of two additional wells downgradient (west) of the <br />tailings and collection pond facilities to evaluate the magnitude and direction of local ground <br />water flow and to test these wells to evaluate aquifer hydraulic characteristics. The aquifer <br />hydraulic characteristics derived from these tests will then be used to model the capability of the <br />installed wells to create a hydraulic barrier downgradient from the tailings facility and collection <br />pond, should containment and remediation of tailings effluent leakage become necessary in the <br />future. <br />Since the proposed modifications to the ground water monitoring program leave not been <br />approved by the CMLRD (and, therefore, the field program leas not been impletnented), the <br />number and locations of wells necessary to effect groundwater containment cannot be determined <br />at this time. Following CMLRD approval of the program and its implemenlatipn by Battle <br />Mountain, Battle Mountain will submit separate documentation to CMLRD reporting the results <br />from the additional drilling, testing and modelling. This documentation will provide information <br />addressing the number of wells and well locations that would be necessary to provide adequate <br />containment for potential tailings effluent leakage. <br />In the event that it becomes necessary to institute a ground water remediation program, discharge <br />from the applicable ground water remediation wells would be routed back to the detoxification <br />process. Water quality would be monitored from the pump discharge to evaluate cyanide ~ '~' <br />. .•, r <br />concentrations to assess when the remediation program could be concluded. Water quality lc~'~' ,, ;'~~„•~ <br />monitoring would also continue after pumping ceases to evaluate if the contaminants have beeni '1,,.~ ,`.'1~'~ <br />~~~~~ <br />purged from the aquifer down to acceptable concentrations. These monitoring effotts would be <br />conducted in accordance with the "Quality Assurance/Quality Control Protocols for tl~c <br />-2- <br />~~ <br />