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n COPYENVIRONMENTAL INC 3330 Cameron Park Drive Ste 550 Cameron Park CoNfornia 95682 (530)676-6004-Fax (530)676-6005 July 31, 2002 U V V Project No 2002-1426-01 AUG 4 9 2002 Mr Travis Bryant ENVIRONMENT HEALTH Interstate Brands Corporation PERMIT/SERVICES 12 East Armour Boulevard Kansas City, MO 64111 Re Second Quarter 2002 Groundwater Monitoring Report for the Former Dolly Madison Facility, located at 1426 South Lincoln Street, Stockton, California Dear Mr Bryant Stratus Environmental, Inc (Stratus) has prepared this second quarter 2002 groundwater monitoring report for Interstate Brands Corporation (IBC), former Dolly Madison facility, located at 1426 South Lincoln Street, Stockton, California (Figure 1) This report presents groundwater elevations measured in the two onsite groundwater monitoring wells, and analytical results of groundwater samples The site is on a quarterly groundwater monitoring program BACKGROUND The site is located approximately 200 feet south of the intersection of Charter Way and South Lincoln Street in Stockton, California On July 29, 1988, SEMCO of Modesto, California, observed the removal of a 1,000-gallon underground storage tank (UST) Based on analytical results of soil samples collected from beneath the former UST, residual hydrocarbons were present Total petroleum hydrocarbons as gasoline (TPHG) were detected at a concentration of 95 parts per million (ppm) Benzene, total petroleum hydrocarbons as diesel, kerosene, and motor oil were below laboratory detection limits The approximate former UST location relative to site structures is shown on Figure 2 In February 1997, EMCON drilled three soil borings onsite Soil boring B-1 was converted to vapor extraction well VW-1, and bonngs B-2 and B-3 were converted to groundwater monitoring wells MW-1 and MW-2, respectively Based on analytical data collected from the soil borings, soil beneath the site was impacted by petroleum hydrocarbons The highest concentration was detected in soil boring B-1, which was located beneath the former UST Residual petroleum hydrocarbons were not detected in the vadose zone (0 to 21 5 feet below ground surface [bgs]), but were detected in the saturated zone Analytical results of groundwater indicated dissolved hydrocarbons were detected in monitoring wells MW-1 and MW-2 (EMCON, August 4, 1997) TPHG was detected in monitoring wells MW-1 and MW-2 at concentrations of 18,000 parts per billion (ppb) and 220 ppb, respectively Benzene was detected 1n monitoring wells MW-1 and MW-2 at concentrations of 4,400 and 33 ppb, respectively P It 8 C\Stockton\Qrtly120021I13C Stockton-2Q02 doc