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1 INTRODUCTION Philip Environmental Services Corporation (PSC) performed groundwater monitoring activities at the former Earthgrains Company facility in October 2004 This report ' summarizes the results of those activities This report also includes updated contaminant mass estimates, groundwater fate and transport models, and addresses comments contained in correspondence from the San Joaquin County Health Department (SJCEHD) dated September 24, 2004 1.1 Site Description 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 1,000-foot-long, shallow(less than 5-feet deep), storm water 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 storm water sewer lines transect the property 1.1 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 corner 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 Following the December 1986 tank integrity test failure, Environmental Science & Engineering (ESE) drilled five borings around the perimeter of the two adjacent gasoline USTs and collected soil samples for analysis ESE's 4 Quarterly Groundwater Monitoring Report October 2004 The Earthgrains Company Facility 2651 South Airport Way-Stockton,California Prepared for SARA LEE BAKERY GRoup Prepared by Philip Services Corp H%W6240013211213B2EGVStockton AirportWayllnvestigauon and Quarterly Reports%Quarterly Report 10_2004 doe December 09,2004