SITE INFORMATION AND CORRESPONDENCE

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Sharpe -2- 19 September 1984 The State ( SEB , TSCD , and the Board) believes that Sharpe is the probable source of 1 , 2-Dichloroethane in the Cembrano well because: 1 . 1 , 2-Dichloroethane is both a possible breakdown product of 1 , 1 , 1-Trichloroethane and a possible contaminant in stock grades of Trichloroethylene and Tetrachloroethylene, all of which have been found in the shallow monitoring wells in the North Balloon area of the Depot; and 2 . Previous ground water gradient data has shown that flow from the North end of the Depot to the Cembrano well is possible . B. Contamination in Other off-Post Domestic Wells Sharpe stated that they do not believe pollution in the other off-post domestic wells is attributable to them. Mr. Welsh said that other sources of chlorinated volatile organics may exist between the Depot and these wells , such as individuals dumping solvents in their backyards and polluting their own wells. Mr. Reents stated that while investigating the Cembrano residence he and Mr . Friedrich had also conducted a survey of the area surrounding the Depot. No feasible sources of volatile organic contamination were identified and only agricultural fields exist between the Depot and the affected wells. The State believes that the existing data shows the Depot to be the probable source of contamination. Mr. Welsh recommended, and the State agreed, to wait until the results of the on-going confirmation sampling presently being conducted by Weston Labor- atory are available before making any further assess- ments. The sampling by Weston was to be completed by 10 September but Sharpe informed the State at the meeting that sampling had just begun on 12 September. Results will not be available until approximately the first week in October.