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A. REMEDIAL, REMOVAL, AND INVESTIGATION ACTIVITIES <br /> 1. REMEDIAL, REMOVAL, AND INVESTIGATION ACTIVITIES: Discussion of <br /> Analytical Results. <br /> a. MONITORING WELLS ANALYTICAL RESULTS (See Section 3, Quality <br /> Assurance Laboratory—Me—ports) <br /> Sharpe sampled the majority of its monitoring wells once during <br /> the quarter. The samples were analyzed for Halogenated Volatile Organic <br /> Compounds by EPA Method 601. The results are tabulated in Section 2b. The 5 <br /> ppb contaminant contour is plotted on maps included in Section 2c. Analysis <br /> of the data is also included. Quality Assurance Laboratory exhibited a high <br /> occurrence rate of methylene chloride cross-contamination of environmental <br /> samples. <br /> b. POTABLE WATER WELLS ANALYTICAL RESULTS <br /> Sharpe sampled thirty-nine (39) potable water wells: four (#1, <br /> #3, #5, #6) on the installation and thirty-five (35) privately owned potable <br /> water wells. The report of results is provided to the owner or leasor of the <br /> property on which the wells reside. All samples were analyzed for <br /> Halogenated and Aromatic Volatile Organics by EPA Method 524.2 and Arsenic by <br /> EPA Method 206.2. The regulatory maximum contaminant level for Arsenic of 50 <br /> ug/L was not exceeded. Volatile Organic Compounds detected follow. <br /> Address Results Contaminant MCL <br /> 11338 Harlan Road 0.23 ug/L Trichloroethene 5.0 <br /> 11616 Harlan Road 0.42 ug/L Trichloroethene 5.0 <br /> 1.64 ug/L 1,2 Dichloropropane 5.0 <br /> 342 Roth Road 1.05 ug/L Trichloroethene 5.0 <br /> (Lifetile Corp) <br /> 427 Roth Road 0.57 ug/L Tetrachloroethene 5.0 <br /> 707 Roth Road 5.30 ug/L 1 ,2 Dichloroethane 3.0 <br /> Lathrop WDP#5 0.42 ug/L Trichloroethene 5.0 <br /> As with the monitoring well samples, Quality Assurance Laboratory <br /> exhibited a high occurrence rate of methylene chloride cross-contamination of <br /> environmental samples. <br /> Methylene Chloride cross contamination occurred as follows: <br /> 11338 Harlan (0.22 ug/L) , 11378 Harlan (0.91 ug/L) , 11401 Harlan (0.23 ug/L) , <br /> 11434 Harlan (0.83 ug/L) , 11500 Harlan (0.61 ug/L) , 12644 Harlan (0.97 ug/L) , <br /> 12796 Harlan (1.06 ug/L) , Harlan/Schilling (1.02 ug/L) , and 147 Lathrop Road <br /> (0.99 ug/L). <br />