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1 INTRODUCTION Philip Environmental Services Corporation (PSC) performed a subsurface site investigation at the Earthgrains Company facility in June 2004 to assess the extent of petroleum hydrocarbon impact associated with a former gasoline underground storage tank(UST) This work was performed in general accordance with the February 20, 2004 Subsurface Investigation Work Plan that was submitted to and approved by the San Joaquin County Environmental Health Department (EHD) Information concerning the site, previous UST-related activities, investigation procedures, PSC's findings and our recommendations for subsequent work are contained herein 1.1 Site Descnption The facility is a bakery products plant located at 2651 South Airport Way in Stockton, California(see Figure 1) The plant straddles Sections 22 and 23, Township 1 North, Range 6 East of the Mount Diablo Base and Meridian The site has a general elevation of 17 feet relative to mean sea level The developed portion of the facility consists of approximately seven acres, which is relatively flat lying, and is almost entirely covered with asphalt and concrete The main facility building covers about two acres An approximately 1,000-foot-long, shallow(less than 5-feet deep), stormwater drainage ditch extends westerly from the southwest side of the facility towards a south- flowing drainage canal This ditch empties into the intermittent Duck Creek, which is located about 900 feet south of the plant Duck Creek is typically dry except during periods of higher precipitation Several shallow (less than 3 feet deep) water, electrical or stormwater sewer lines transect the property 12 Chronology of UST-Related Events The facility once had four petroleum hydrocarbon USTs A former 10,000- gallon diesel-fuel tank and two 6,000-gallon gasoline tanks were located near the southwest comer of the main plant building (shown in Figure 2) A 20,000-gallon diesel-fuel tank was located on the east side of the facility The gasoline tanks near the southwest building corner were permanently removed in April 1987 The eastern-most gasoline tank had previously been taken out of service and abandoned in place by removing the fuel and filling it with sand The western-most gasoline tank failed a tank integrity test in December 1986, which initiated the permanent removal of both USTs The two diesel-fuel USTs were removed in September 1989 4 June 2044 Site investigation Report The Earthgralns Company Facility 2651 South Airport Way-Stockton,California Prepared for SARA LEE BmUNG GROUP Prepared by Philip Services Corp H TNW2400132\121382EG\StocktonVunt 2004 lnY=t1gahon Report doc August 9,2004