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:rpe -S- 19 Septemeber 1984 B. North Balloon Area The State believes that the recent data showing pollution in off-post domestic wells north and west of the North Balloon area indicates a possible plume which should be investigated by Sharpe . Mr . Welsh responded that the pollution could be from other sources (see item I . above) and will not commit to any further monitoring wells in the North Balloon area beyond the four that have been proposed. If the on-post monitoring wells show levels of contaminants above State Action Levels , Welsh stated that they would then consider off-post monitoring wells in the North Balloon area. SV. Analytical Techniques since the detection limits used by USATHMA are signifi- cantly higher than EPA detection limits for the same analyses , the State has requested USATHMA to obtain approval from EPA for USATHMA' s methods . Mr. Welsh stated that although they believe their methods are valid under EPA ' s regulations and are also more rigorous than EPA methods , they will not apply to EPA for approval or concurrence. The State requested that all analytical results be reported using EPA methods . If Sharpe also wants to include results reported at their detection limits the state has no objections . Mr. Welsh stated that they will report results using EPA methodology only for constituents for which USATHMA' s limits exceed the State Action Levels. The State did not agree. V Arsenic Contamination Sharpe responded to the Board ' s 8 August letter and memorandum regarding Arsenic contamination . Mr . Welsh stated that although they will include Arsenic in all future sample analyses, he is convinced from the existing data that the Depot is not a source . The State does not agree but will review the forthcoming data before making a final assessment.