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, <br /> Site Background Information <br /> Former STOCKTON PLATING Facility <br /> 632 South E1 Dorado, Stockton, California 4 -41-,_„ r i ,, <br /> t , <br /> I <br /> BACKGROUND <br /> r j <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 in the vicinity ; ' 4l <br /> of the site is industrial and commercial Residential areas are located approximately one-quarter mile <br /> south and east of the site <br /> I <br /> GROUND WATER DEPTH AND FLOW DIRECTION <br /> I , <br /> Based on a review of the Lines of Equal Depth to Groundwater Sprang 1998 map published by the <br /> San Joaquin County Flood Control District and Water Conservation District (FCD&WCD), the <br />' estimated depth to ground water at the site is 45 feet bsg Review of,the map Lines of Equal <br /> Elevation of Groundwater Spring 1998(FCD&WCD)indicated that the regional ground water flow <br />' direction in the area to be towards the northwest and west Between May 1995, and the present time, <br /> depth to ground water at the site has risen from 50 feet bsg to 25 feet bsg, with a general ground <br /> water flow direction towards the east Ground water elevation contour maps for the site have been j <br />' included in previous quarterly reports prepared by AGE <br /> Review of previous ground water monitoring at the site and historical depth to ground water maps <br /> (FCD&WCD) dating back to 1971 suggested that ground water depth near the site has been as deep <br /> as 60 feet bsg <br /> UNDERGROUND STORAGE TANK REMOVAL <br /> AGE has been informed that two underground storage tanks (USTs),were removed from the <br /> property One 1,000-gallon leaded gasoline UST was removed from the site in August 1986 and one �r <br /> 2,000-gall6n unleaded gasoline UST was removed from'the site in 1990 Petroleum hydrocarbons " <br />' were detected in soil samples collected from beneath both USTs at the time of the removals Results ' <br /> of the UST removals were summarized in reports prepared by American Environmental Management ell 4 ' <br /> Corporation(AEMC,6 October 1986)and Condor Earth,Technologies,Inc (CET,2 January 1991) <br /> SITE ASSESSMENT/ INSTALLATION OF GROUND WATER MONITORING WELLS <br /> Since 1990,a total of eight groundwater monitoring wells,multiple soil borings/soil vapor sampling <br /> locations and four soil vapor extraction wells have been installed at the site to develop a hydrologic <br /> I ' <br /> . model and assess vertical and lateral extent of hydrocarbon-impacted soil and ground water <br /> I n <br /> s Advanced Geo Environmental,inc h <br /> , <br />