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N 350 E. The gradient was calculated to be 0 0033 ft!ft directed N 47° E during the May <br /> 1994 monitoring event Groundwater rose approximately three feet between the November <br /> 1993 and May 1994 monitoring events <br /> ' 3.0 PROCEDURES <br /> 3.1 Monitoring Well Purge Procedures <br /> ' On September 26, 1994, the water level in each well was measured relative to the top of the <br /> casing using a Solinst water level meter (Table 1) After water levels were measured, a PVC <br /> bailer was used to purge approximately 7 to 8 gallons (minimum of three well volumes) of <br /> water from each well Temperature, pH and conductivity were measured at one-gallon <br /> intervals using an ICM model 52200 water analyzer Stabilization data and field logs are <br /> included in Appendix A The purge water was stored on-site in 55-gallon drums <br /> TABLE 1 <br /> ' RELATIVE GROUNDWATER ELEVATIONS <br /> Pacific Gas <br /> 2088 Mariposa Road, Stockton, California <br /> Relative Depth to Groundwater Relative Groundwater <br /> WeII No Casing Elevation <br /> Elevation 5-27-94 9-26-94 5-27-94 9-26-94 <br /> MW-1 9809 7164 7304 2645 2505 <br /> MW-2 9750 7118 7262 2632 2488 <br /> ' MW-3 9740 7085 7227 2655 2513 <br /> 'All measurements in feet <br /> ' 3.2 Groundwater Sample Collection and Analysis <br /> Water samples were collected from each well using a new disposable plastic bailer Three <br /> ' 40-m1 EPA vials and one 1-liter amber bottle of water were collected from each well The <br /> samples were logged on a chain-of-custody form and transported in a chilled container to <br /> Alpha Analytical Laboratories (AAL) in Uloah Each sample was analyzed for TPH <br /> ' (gasoline and diesel) and BTE&X in accordance with EPA methods 5030, 8015m and 602, <br /> respectively The laboratory report and chain-of-custody are presented in Appendix B <br /> P—&o..Qxw" n s <br /> 1 <br />