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i <br /> QUARTERLY REPORT a <br /> December 1995 <br />' Stockton Plating <br /> 632 South El Dorado Street <br />' Stockton, California <br />' 1.4. INTRODUCTION <br /> In accordance with the request of Stockton Plating,Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared this Quarterly Report of ground water monitoring activities at 632 South El Dorado Street <br /> in Stockton, Cahforrua (the site) This report detailstthe sampling of four ground water wells on the <br /> site The location of the site is illustrated in Figure 1 -Location Map A plan of the site is depicted <br />' in Figure 2 - Site Plan <br /> Monitoring and sampling procedures were performed in accordance with guidelines established by <br />' the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and <br /> Central Valley Regional Water Quality Control Board(CVRWQCB) for investigation of underground <br />' storage tank (UST) sites <br /> 2.0. BACKGROUND <br /> 21 SITE DESCRIPTION <br />' The site is located along Scotts Avenue in a relatively flat area of southwest Stockton, immediately <br /> south of Mormon Slough and east of the El Dorado Street overpass Local land use is the vicinity of <br />' the site,is industrial and commercial Residential areas are located approximately one-quarter mile <br /> south and east of the site <br /> 2 2 UNDERGROUND STORAGE TANK REMOVAL <br />' It is our understanding that two underground storage tanks (USTs) were removed from the property <br /> one 1,000-gallon leaded gasoline UST in August 1986 and one 2,000-gallon unleaded gasoline UST <br /> in December 1990 Petroleum hydrocarbons were detected in soil samples collected from beneath <br /> both USTs at the time of removals Results of the UST removals were summarized in reports <br /> prepared by American Environmental Management Corporation (AEMC, report dated 6 October <br /> 1986) and Condor Earth Technologies, Inc (CET, report 2 January 1991) <br /> I23 SITE ASSESSMENT <br /> Between 1991 and 1995, six soil borings, four ground water monitoring wells, three soil probings, <br /> nine soil-vapor probings and four soil vapor extraction wells were advanced and/or installed at the <br /> F <br />