Laserfiche WebLink
aF <br /> APPENDIX A <br /> • SITE BACKGROUND INFORMATION <br /> Former STOCKTON PLATING Facility { <br /> 632 South El Dorado, Stockton, California, <br /> hill <br /> 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 <br /> ` <br /> of the site is industrial and commercial Residential areas are located approximately one-quarter mile <br />' south and east of the site <br />' GROUNDWATER DEPTH AND FLOW DIRECTION f <br /> Based on a review of the Lanes of,Equal Depth to Groundwater Sprang 1998 map published by the <br /> San Joaquin County Flood,Control,Distnct and Water Conservation District (FCD&WCD), the <br /> estimated depth to groundwater at the site is 45 feet bsg Review of the map Lanes 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 <br /> included in previous quarterly reports prepared by AGE L <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 /> 7 <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 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 Amencan Environmental Management <br /> ' Corporation(AEMC,6 October,1986)and Condor Earth Technologies,Inc (CET,2 January 1991) <br /> SITE ASSESSMENT/ INSTALLATION OF GROUNDWATER MONITORING WELLS ' <br /> Since' 1990,"a total of eight ground water monitoring wells,multiple soil bonngs/soil vapor sampling `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 <br /> a � <br />