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*4Wr.r O <br /> Antonia K. J. Vorster 2 28 November 1989 <br /> 3) Sampling of the new monitoring well , the existing monitoring wells, and the <br /> existing dewatering wells for BTEX, TPPH, and oil and grease. <br /> SUMMARY TABLE OF ANALYTICAL RESULTS <br /> WELL EPA METHOD 8260 BENZENE OIL AND GREASE <br /> TPPH (ppb) (Ppb) (ppb) <br /> SW-1 ND --- --- <br /> SW-2(abandoned) -- --- YES <br /> DW-1 1200 410 --- <br /> DW-2 --- <br /> DW-3 ND --- <br /> MW-1 -- * YES <br /> MW-2 -- --- YES <br /> MW-3 ND =-- --- <br /> * = low concentration <br /> --- not analyzed <br /> NO = non-detected <br /> -------------------- ----- -------- -------------- <br /> Following are my comments and recommendations: <br /> 1) The laboratory data sheets for the analyses conducted on the monitoring wells, <br /> the dewatering wells, and the domestic water supply wells should be submitted <br /> immediately. In addition, the detection limit of the soil vapor survey should <br /> be stated. <br /> 2) Oil and grease were detected within MW-1, MW-2, and SW-2, but levels were not <br /> reported. Laboratory data sheets must be provided. Furthermore, have TPHCs and <br /> benzene analyses been conducted on water samples from these wells? If so, what <br /> are the results. <br /> 3) Water level measurements in the monitoring and dewatering wells must be taken <br /> to confirm the ground water table contour map developed by Dames and Moore from <br /> water level measurements taken in 1987. If water levels were taken by WGR during <br /> the last sampling of the wells, then this data should be used to develop a ground <br /> water table contour map. This map should be submitted immediately. <br /> 4) Based upon the results of the soil vapor survey it seems reasonable to install <br /> monitoring wells south of Grant Line Road where elevated levels of volatile <br /> hydrocarbons (VP-1 and VP-2) were detected, and downgradient of soil vapor <br /> sampling point VP-18 which had the greatest TVH level of 210 ppm. The consultant <br /> should explain his reasoning for placing his one additional monitoring well in <br />