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F-88224 Page 3 <br /> installed in 1986 to monitor upgradient conditions as part of an assess- <br /> ment performed for the adjacent fuel terminal. No existing surface or <br /> subsurface pipelines, utilities, septic systems, or other structures are <br /> known to traverse the site. The nearest off-site structures are above- <br /> ground fuel storage tanks within the adjacent Shell terminal. The <br /> closest one lies about 40 feet south of the southern site boundary. The <br /> nearest subsurface drain system lies approximately 18 feet south of the <br /> southern boundary, within the adjacent terminal. No public or private <br /> water supply wells are known to exist on or adjacent to the site. <br /> HYDROGEOLOGY <br /> The upper geologic materials beneath the site consist of deltaic <br /> deposits of loosely consolidated gravel, sand, silt, and clay. Ground <br /> water occurs locally under unconfined conditions and is anticipated to <br /> occur between 12 and 14 feet beneath the site. The direction of ground <br /> water flow is generally to the south and is influenced strongly by the <br /> recharging effects of the San Joaquin River. <br /> -000- <br /> . <br />