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Cecchuu Cecchm, and Qovannom Fueling Island 16 1 400 ResuRts 4A Ground Water IEllcvaflonn Data Ground water elevations measured in monitoring wells UST-1 through UST-4 on March 26, 1996 are presented in Table 1 The average depth to ground water (as measured from the top of casing for each monitoring well) was approximately 59 feet below ground surface (bgs) The ground water level noted this quarter have risen approximately 6 feet since last quarter No free product was observed in any of the wells Figure 3 - Ground Water Elevate shows ground water flow beneath the site on March /26, 1996, to be toward the norto northeast over the entire site at a gradient of . approximately 0 004 foot per foot (22 feet per mile) The gradient appears flatter in the northern portion of the site. The findings are consistent with the data of previous ® monitoring events. This flow direction is similar to regional flow direction interpreted ® from San Joaquin County Spring 1994 Ground Nater Report Maps (San Joaquin County Flood, 1994) 6.2 Ground Water AanaRytncaR Resu fts The ground water samples from UST-1 through UST-4 were analyzed at the laboratory for 0 Total Petroleum Hydrocarbons as diesel (TPH-D) using EPA Method 3550/8015 Modified, and a 0 Total Petroleum Hydrocarbons as gasoline (TPH-G) using EPA Method 503018015, and 0 Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA Method 5030/8020 The trip blank was only analyzed for BTEX Analytical results for wells UST-1 through UST-4 are listed in Table 2 - Summary of Ground Water Samples Analytical Results The certified analytical reports are presented in (Appendix B) On March 26, 1996, ground water from UST-1 was reported to contain TPH-D at a concentrations of 180 micrograms per liter (µg11) TPH-G was reported as f 169254W\gtrly rptllgtr96 rpt 6 Environmental Science do Fngineenng, Inc Tj