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Arsenal property, plume sizes and contaminant concentrations are steadily declining and can be <br />expected to abate to acceptable levels some time in the coming years. <br />B. Status of Groundwater testing <br />The operator has not submitted test results for any of the cited contaminants. The regulations do <br />not evidently require notice of contaminants, if such are present. However, the regulations do <br />require a statement, under Exhibit G at (1), (2)(a), (2)(b), and (2)(c) of the Pernrit Application, <br />saying whether groundwater systems will be affected and how such effects will be managed. <br />C. Need for an NPDES discharge nerntit <br />As indicated by the operator and its representatives, [he company is aware that water discharged <br />[o waters of the state will need to be regulated through an NPDES or CDPS permit. The operator <br />has indicated that application for such permit is being prepazed. <br />D. Potential for withdrawal of off-site contaminants througl~umpinG. <br />It appears from first principles that groundwater extraction for mining in the proposed area could <br />locally affect the Flow of.groundwater, which has been identified as containing DIMP, <br />potentially causing that water to report to the gravel operation's pumping system. Provided there <br />are contaminants still in the plume, the operator would need to handle such water in a manner <br />compatible with required measures to protect human health and the environment, and to effect <br />compliance with discharge regulations to surface water. Withdrawal of contaminated water from <br />the plume is no[, per se, an issue regulated by the Division of Minerals and Geology. <br />RECOMMENDATIONS <br />1. It is recommended that the Operator consult EPA or US Amty documents and determine <br />current contaminant levels of DIMP and TCLEE in and around section 10, which contains <br />the operation. All well monitoring information for DIMP and TCLEE in Section 10 and up <br />to''/4 mile outside section ]0 should be evaluated. <br />2. Provided DIMP or TCLEE in concentrations exceeding drinking water standards occurs in <br />any of the wells cited in Recommendation 1, the operator determine whether such <br />contaminants will be collected via the mine pump system, and how such contaminants will <br />be handled prior to discharge. <br />3. Provided DIMP or TCLEE in concentrations exceeding drinking water standards occurs in <br />any of the wells cited in Recommendation 1, it is recommended that tl~e operator report the <br />health risks associated with withdrawal of such contaminants. At a minimum, the operator <br />should furnish to the Division an MSDS report on each of the contaminants found in the <br />groundwater contaminant evaluation cited in Recommendation 1, above. <br />cc: Carl Mount <br />Bruce Humphries <br />