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ENVIRON,I NTAL441N 2460 Countryside Drive Placerville California 95667 - Phone (530)295-1992- Fax (530)642 1760 February 25, 2000 Protect No 2002-1426-01 Mr Travis Bryant Interstate Brands Corporation 12 E Armour Blvd Kansas City, MO 64111 RE Fourth Quarter 1999 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 fourth quarter 1999 groundwater monitoring report for Interstate Brands Corporation (IBC) for the 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 grab samples It is our understanding that 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 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 Figure2 In February 1997, EMCON drilled three soil borings onsite Soil boring B-1 was I converted to vapor extraction well VW-1, and borings 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), 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 in monitoring wells MW-1 and MW-2 at concentrations of 4,400 and 33 ppb, respectively C \My DocumentsABC15tocktonl4th qtr QMR doe