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On November 10, 1993, the groundwater gradient was calculated to be 11111 ftlft directed <br /> rN 35° E. The gradient was calculated to be 0 0033 ft/ft directed N 470 E during the May <br /> . 1994 monitoring event The gradient was calculated to be 0 0037 ft/ft directed N 54 ° E <br /> during the September 1994 monitoring event Groundwater dropped approximately 15 feet <br />' between the May 1994 and September 1994 monitonng events <br />' 3.0 PROCEDURES <br />' 3.1 Monitoring Well Purge Procedures <br /> On December 8, 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 6 to 8 gallons (minimum of three well volumes) of <br /> water from each well Temperature, pH and conductivity were measured at one-gallon <br /> t intervals using an ICM model 52200 water analyzer Stabilization data and field Iogs 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 /> Well Casing Elevation <br /> No Elevation <br /> 5-27-94 9-26-94 12-8-94 5-27-94 9-26-94 12-8-94 <br /> ' MW-1 9809 7164 7304 7307 2645 2505 2502 <br /> ' MW-2 9750 7118 1 7262 7260 2632 1 2488 2490 <br /> MW-3 9740 7085 7227 72 27 2655 1 2513 25 13 <br /> All measurements in feet Gr� �Q� �;15 <br /> OZ <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 During transmittal to AAL,the 1-liter diesel <br /> sample from MW-2 was broken Therefore a replacement sample was collected on <br /> ' December 12, 1994 <br /> Each sample was analyzed for TPH (gasoline and diesel) and BTE&X in accordance with <br /> 0-6X-1 A.dn S.rv.ra,i.. <br /> P..r.G.,QR4A2 KWI S <br /> 1 <br /> 1 <br />