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OF—MMATRIX <br /> FIRST QUARTER 2003 <br /> GROUNDWATER MONITORING REPORT <br /> UST Site No 3 — Port of Stockton <br /> Stockton, California <br /> 1 <br /> 1 1.0 INTRODUCTION <br /> This report summarizes the first quarter 2003 monitoring event at the Port of Stockton's (Port) <br /> former underground storage tank(UST) Site No 3 Monitoring was performed by Geomatnx <br /> Consultants, Inc (Geomatrix), on February 20, 2003, in accordance with directives from the <br />' local enforcement agency, San Joaquin County Department of Environmental Health (SJCDEH) <br /> Site Descnption and Background <br />' UST Site No 3 is located near the central portion of the Port in the City of Stockton, San Joaquin <br /> County, California, approximately 50 feet north of Port Road G and about 300 feet west of Port <br />' Road 14 (Figures 1 and 2) The site is catalogued by SJCDEH as Site Code 1282-124 <br /> The site formerly contained two 12,000-gallon tanks, both of which stored unleaded gasoline <br /> (Figure 2) The tanks were removed in 1988, along with approximately 180 cubic yards of soil <br />' excavated to a depth of about 11 feet below ground surface (bgs) Detailed descriptions of the <br /> site, the site investigation history,and the site hydrogeologic setting are available in the Results <br />' of Additional Assessment and Remediation Evaluation of Petroleum Hydrocarbons in <br /> Groundwater (Geomatrix, 2003) <br />' The site is located on the delta of the San Joaquin River, approximately 2 miles east of the <br /> confluence of the San Joaquin and Calaveras rivers The subsurface geology consists of a thick <br />' sequence of alluvial deposits of late Tertiary to Holocene Age overlying sedimentary rocks of <br /> Cretaceous to Tertiary Age, which, in turn, overlie crystalline basement rocks (Bartow and <br />' Nilsen, 1990) Site specific data collected to a maximum depth of 49 feet indicate a soil profile <br /> consisting of interbedded sands and clays Site data indicate that depth to groundwater has <br /> ranged from 9 to 16 feet bgs since 1999 Groundwater is confined to semiconfined below the <br />' site <br /> I <br /> I 1PR0IEC Vk00s%437 00016437-06 dm 1 <br />