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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 Reports <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-eight (38) potable water wells: four (#1 , <br /> #3, #5) 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 /> 124 Roth Road 0.46 ug/L Tetrachloroethene 5.0 <br /> 342 Roth Road 0.62 ug/L Tetrachloroethene 5.0 <br /> (Lifetile Corp) <br /> 427 Roth Road 0.35 ug/L Tetrachloroethene 5.0 <br /> 707 Roth Road 4.74 ug/L 1 ,2 Dichloroethane 3.0 <br /> 747 Roth Road 0.10 ug/L Trichlorofluoromethane 150.0 <br /> The MCL for 1,2 Dichloroethane of 3.0 is exceeded at 707 Roth <br /> Road. Based on location of this well and compound found, the contaminant did <br /> not originate at Sharpe. This well serves a residence and San Joaquin <br /> Grinding Company which is located North of Building S-4 at Sharpe, across <br /> Roth Road. <br /> Laboratory induced Methylene Chloride cross contamination <br /> occurred as follows: 11338 Harlan (0.13 ug/L) , 11378 Harlan (0.27 ug/L) , <br /> 11434 Harlan (0.87 ug/L) , 11500 Harlan (0.85 ug/L) , 12644 Harlan (0.86 ug/L) , <br /> Harlan/Schilling (0.71 ug/L) , 147 Lathrop Road (0.56 ug/L) , 11550 Harlan <br /> (0.78 ug/L) , 12510 Harlan (0.81 ug/L) , 12488 Harlan (9.19 ug/L) , 1945 Lathrop <br /> Road (0.61 ug/L) , 10402 McKinley (0.61 ug/L). <br />