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hydrant was assigned an arbitrary elevation of 100 feet The relative groundwater elevations <br /> of each well were then calculated On November 10, 1993, the groundwater gradient was <br /> calculated to be 0 0063 ft/ft directed N 35° E <br /> ' 3.0 PROCEDURES <br /> 3.1 Monitoring Well Purge Procedure <br /> On May 27, 1994, the water levels in all three wells were 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 8 gallons (minimum of three well volumes) of water <br /> from each well Temperature, pH and conductivity were measured at one-gallon intervals <br /> using an ICM model 52200 water analyzer Stabilization data and Meld logs are included in <br /> Appendix A The purge water was stored on-site in 55-gallon drums <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 Ukiah 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 Y <br /> TABLE 1 <br /> ' RELATIVE GROUNDWATER ELEVATIONS <br /> Pacific Gas <br /> 1Depth to Groundwater Relative Groundwater <br /> Relative Elevation <br /> FWell Casing 11/10/93 5/27/94 11/10/94 5/27/94 <br /> Elevation <br /> 9809 7466 7164 2343 2645 <br /> MW-2 9750 7426 7118 2324 2632 <br /> MW-3 9740 7372-1 7085 2368 2655 <br /> +All measurements In feet <br /> Gwlpepl Ando kcn k Icc C <br /> P..&G.42 169W2-S 5 <br />