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Cecchuu, Cecchtnr, and Giovannani, Fueling Island <br /> 4.0 Res uR is <br /> 4.1 Ground Water Devadoun Data <br /> Ground water elevations measured in monitoring wells UST-1 through UST--4 on September 6, <br /> 1995 are presented in Table 1 The average depth to ground water (as measured from the top of <br /> casing for each monitoring well) was approximately 68 9 feet below ground surface (bgs) The <br /> ground water level noted this quarter have drooped approximately 0 9 feet since last quarter No <br /> free product was observed in any of the wells <br /> Figure 3 - Ground Water Elevations shows ground water flow beneath the site on September 6, <br /> 1995, to be toward the north to northeast over the entire site and locally towards UST-1 at a <br /> gradient of approximately 0 025 feet per foot (132 feet per mile) The gradient appears flatter in <br /> the northern portion of the site The difference in gradient is likely due to pumping influences of <br /> the onsite wells The findings are consistent with the data of previous monitoring events ESE <br /> observed that the well box for well UST-1 had broken again and was in need of repair The <br /> remaining ground water monitoring wells appeared in good condition This flow direction is <br /> similar to regional flow direction interpreted from San Joaquin County Spring 1994 Ground Water <br /> Report Maps (San Joaquin County Flood, 1994) <br /> 4.2 Gu-o undl Water Ana➢yfneaR Results <br /> The ground water sample from UST-1 was analyzed at the laboratory for <br /> o Total Petroleum Hydrocarbons as diesel (TPH-D) using EPA Method 3550/8015 <br /> Modified, and <br /> o Petroleum Hydrocarbons as gasoline (TPH-G) using EPA Method 503018015, <br /> Total y <br /> and ` <br /> 0 Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA Method <br /> 5030/8020 <br /> The trip blank was only analyzed for BTEX Analytical results for wells UST-1 through UST-4 <br /> are listed in Table 2 - Summary of Ground Water Samples Analytical Results The certified <br /> analytical reports are presented in (Appendix B) On September 6, 1995, ground water from <br /> UST-1 was reported to contain only TPH-D at a concentration of 120 micrograms per liter (µg11) <br /> TPH-D was reported as non-detect in ground water samples collected from monitoring wells UST- <br /> f 169254001gtrly rptl3gtt95 rpt $ Environmental science&Engineering, Inc <br /> Q <br />