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i <br /> I£ i <br /> 1 M i <br /> Site Background Information <br /> } Former STOCKTON PLATING Facility <br /> ` 632 South E1 Dorado, Stockton, California <br /> 'E BACKGROUND <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 - -of the site is Industrial and commercial Residential areas are located approximately one-quarter mile <br /> south and east of the site <br /> 1 <br /> I + <br /> GROUND WATER DEPTH AND FLOW DIRECTION <br />' Based on a review of the Lanes of Equal Depth to Groundwater Spring 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 Lanes of Equal <br />' Elevation of Groundwater Sprang 1998(FCD&WCI7)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 <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 /> a <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 <br /> 2,000-gallon unleaded gasoline UST was removed from the site in1990Petroleum hydrocarbons <br /> were detected in'soll samples collected from beneath both USTs at the time of the removals Results z <br />' of the UST removals were summarized in reports prepared by American Environmental Management <br /> Corporation(AEMC, 6 October 1986)and Condor Earth Technologies,Inc (CET,2 January 1991) <br /> 1 <br /> SITE ASSESSMENT/INSTALLATION OF GROUND WATER MONITORING WELLS <br /> 1 Since 1990,a total of eight ground water 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 /> model and assess vertical and lateral extent of hydrocarbon-impacted soil and ground water The <br /> following is a summary of milestone events at the site <br />' Advanced GeoEnvironmental,Inc <br /> 1 i <br /> I <br />