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11 <br /> Subsurface Investigation December 12, 1990 <br /> Former Unocal Station No. 2859, Stockton, California AGS 38012-5 <br /> Groui,d water monitoring has been conducted quarterly since June 1988. Cumulative results <br /> are presented under discussion of hydrocarbons ir; ground water. <br /> REG:DNAL GEOLOGY <br /> The site is within the Eastern San roaquin County Ground-'Water Basin, as defined by the <br /> California Department of Water Resources (1980). The area is underlain by flood basin <br /> and fluvial sediments consisting of clay, silt, and sand (Rogers. 1956). The topographic <br /> surface is nearly flat with a slight westward slope. Three surface streams are near the site: <br /> Yosemite Lake,the eastern terminus of Smith's Canal,approximately 2,000 feet west of the <br /> site; the eastward extension of the Stock—.. Deep Water Channel (including Mac l cod <br /> Lake), approximately 1 mile south of the site;and the Calaveras River,approximately 6,000 <br /> feet northwest of the site. All three bodies of water empty into tht; San Joaquin River <br /> apprc,cimately 3 miles west of the site. <br /> PROXIMITY TO WELDS AND UTILITIES <br /> Ground-water resources within the Eastern San Joaquin County Basin are intensively <br /> developed for irrigation, domestic, industrial, municipal, and stock use. The locations of <br /> municipal water- supply wells near the site operated by California Water Service of <br /> Stockton,California are shown on Plate P-1. One municipal water-supply well operated by <br /> California Water Service is within 1,000 feet of the site. The locations of known public <br /> utilities near the site are depicted on the Site Area Map (Plate P-4). <br /> 9 <br /> AivP/iPd ���aS,ysterr�� -- -- <br />