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• FIRST QUARTER 2002 REPORT KWIKEE FOODS 2081 Country Club Boulevard Stockton, California March 12,2002 EXECUTIVE SUMMARY Groundwater monitoring took place on February 22. The depth to groundwater was measured with a water level meter and water samples were collected from all seven monitor wells. A battery- operated purge pump was used to purge the wells of standing water, which was stored in DOT- approved drums on site. As directed by San Joaquin County Environmental Health Division in its January 15 letter to the Responsible Parry, samples were analyzed for Total Petroleum Hydrocarbons as gasoline, volatile aromatic hydrocarbons (BTEX), six gasoline oxygenates, 1,2- dichlorethane, ethylene dibromide, and total lead. Due to remediation activities at the Chevron site at 2103 Country Club Boulevard, a groundwater "sink"has developed there, forming a groundwater cone of depression of 8 to 9 inches (.7 feet) in the center of the site. Groundwater flow is now radial toward that site from all directions. PHS/EHD and the CVRWQB -have recently questioned our previous conclusion that contamination at Kwikee Foods originated at the former Chevron site and subsequently migrated eastward in groundwater. New maps showing the distribution of TPH-g, BTEX, and MTBE corroborate that conclusion and depict a hydrocarbon plume centered near the eastern edge of the Chevron site and extending eastward to the Kwikee- site. PHS/EHD also suggested that concentrations detected in well KF-3 in November 2001 were higher because groundwater was- flowing westward and transporting hydrocarbons from the Kwikee UST cavity to that well, but the February sample did not confirm that suggestion. Instead, .concentrations in KF-3 resumed their decline and were less than 50% of those that were detected in November. TPH-g and benzene concentrations have declined by 99% in KF-3 since August of 1997, when they peaked in this well, which is the closest monitoring point to the former UST facility. The concentration of MTBE has remained more stable, fluctuating between 47 and 290 parts per billion since this analyte was first detected in August 1997. In February 2002, the concentration was 66 ppb. Two other oxygenates were also detected: tertiary butanol (TBA) at 28 ppb, and tertiary-amyl-'methyl- ether (TAME) at 0.51 ppb. Hydrocarbon concentrations also declined in the other wells or remained below reporting limits, except in KF-5, where TPH-g and benzene concentrations of 190 and 41 ppb were detected. Other hydrocarbons detected in this well include TBA (13 ppb), MTBE (7.6 ppb), 1,2-DCA (0.74 1