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1 <br /> Historical Background <br /> Former HESS-DUBOIS CLEANERS <br /> ' 348 East Harding Way, Stockton, California <br /> SITE LOCATION <br /> ' The site is located in a business/residential area of lova topographic <br /> relief in Stockton, California. <br /> The site consists of one L-shaped building along Harding Way and base-rock paved parking at the <br /> ' rear of the building. The site is presently occupied by a dry cleaning business,areal estate office and <br /> a sign company. The site was occupied by large-volume dry cleaners from approximately the 1930's <br /> until 1980's. Based on current site configuration, the majority of the dry cleaners appear to have <br /> ' operated at the western edge of the site; however, based on an extensive network'of sub-grade and <br /> covered piping, the dry cleaners may have also operated on the eastern side of the building on the <br /> ' site. <br /> ' -UST REMOVAL <br /> Eight underground storage tanks (USTs) were removed from the site by Falcon Energy <br /> ' Associates (FEA) in January 1991. AGE has been informed that the tanks contained stoddard <br /> solvents used in dry cleaning processes. <br /> Tanks Nos. 1 through 7 were removed from a common excavation along the southern portion of the <br /> property(tank pit No.1).Tank No.8 was removed from beneath the sidewalk along Van Buren Street <br /> (tank pit No.2). Analysis of soil samples collected from tank pit No.I indicated an unauthorized <br /> ' release of petroleum hydrocarbons; petroleum hydrocarbons were not detected in the samples <br /> collected from tank pit No. 2. <br /> ' <br /> GROUND WATER DEPTH AND FLOW DIRECTION <br /> ' Based on review of the Lines of Equal Depth to Groundwater Spring 1999 map published by the San <br /> Joaquin CountyFlood Control District and Water Conservation District(FCD&WCD),the estimated <br /> depth to ground water at the site to be 30 feet below surface grade (bsg). Review of the map Lanes <br /> ' of Equal Elevation of Groundwater Spring 1998 (FCD&WCD) depicts the regional ground water <br /> flow direction towards the northwest and west. Between May 1995 and current,.the elevation of <br /> ' ground water measured from wells on the site have shown an increase of the depth to ground water <br /> from 50 feet bsg to approximately 22 feet bsg,with a general ground water flow direction towards <br /> the east and northeast. Ground water elevation contour maps for the site were included in previous <br /> 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 suggests that ground water depth near the site has fluctuated <br /> between 40 feet bsg and 60 feet bsg. <br /> ' Advanced GeoEnvironmenta[,Inc. <br /> 1 <br />