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FOURTH QUARTER REPORT <br /> KWIKEE FOODS <br /> 2081 Country Club Boulevard <br /> Stockton,California <br /> December 15, 1997 <br /> EXECUTIVE SUMMARY <br /> Upgradient Environmental Consultants performed quarterly monitoring activities at the Kwikee <br /> Foods Mart on November 17, 1997. Samples were collected from all three wells and analyzed for <br /> gasoline, BTEX, and gasoline oxygenates by EPA methods 602, 8020,and 8260. <br /> A Solinst water level meter was used to measure the depth to groundwater in each well. The depth <br /> averaged 12.5 feet below grade. This is the shallowest depth to groundwater that has been measured <br /> since this investigation began in 1990. Using well casing elevation data, a northeastward <br /> groundwater flow direction was determined, with a gradient of approximately 0.00 18 fl/ft. <br /> Each well was pumped to remove standing water before samples were collected, and pH and other <br /> • parameters were measured during purging. These parameters stabilized after approximately 10 <br /> gallons had been pumped. The purged water is stored in 55-gallon drams on site. <br /> As in previous monitoring events, elevated concentrations of gasoline and BTEX were measured in <br /> all wells. The gasoline concentration in IAF-3 was higher than at any previous time. Benzene <br /> concentrations range from 1 to 10 times the hazardous limit of 500 pg/l. In addition, the gasoline <br /> oxygenates methyl-tent-butyl-ether (MTBE) and tert-butanol were detected above the currently <br /> acceptable limit of 35 4g/1. Tert-butanol is reportedly used in Chevron gasoline, which could <br /> suggest that gasoline is migrating eastward from the former Chevron station across Franklin Street. <br /> Matrix interference from the high gasoline concentrations prevented the laboratory from obtaining <br /> the required detection limits for most other oxygenates, so it is unknown whether these are also <br /> present. <br /> Upgradient recommends that the UST's be removed or upgraded in the near future to eliminate the <br /> potential for further contamination. We also recommend further drilling and monitoring to <br /> determine the extent of contamination. A work plan for that work has already been submitted and <br /> approved, and drilling is expected to take place early in 1998. <br /> 1 <br />