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1 <br /> GEOMATRIX <br /> SECOND QUARTER 2003 <br /> GROUNDWATER MONITORING REPORT <br /> UST Site No 3 — Port of Stockton <br /> Stockton, California <br /> 1 <br />' 1.0 INTRODUCTION <br /> This report summarizes the second quarter 2003 groundwater monitoring event at Port of <br />' Stockton's (Port) former underground storage tank (UST) Site No 3 Monitoring was performed <br /> on May 28 and 29, 2003, by WGR Southwest, Inc , (WGR), in accordance with directives from <br />' the local enforcement agency, San Joaquin County Environmental Health Department (EHD) <br /> 1 1.1 SITE DESCRIPTION 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 EHD 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 (Geomatnx, 2003a) <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 sand and clay layers 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 />' 1.2 SUMMARY OF RECENT FIELD ACTiviTiES <br /> • In April 2003, Geomatnx Consultants, Inc (Geomatnx), prepared a report describing the results <br />' of additional assessment and remediation evaluation for UST Site No 3 (Geomatrix, 2003a) <br /> 11PROJEC116000A6437 00016437-t I doc 1 <br />