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FIRST QUARTER REPORT KWIKEE FOODS 2081 Country Club Boulevard Stockton, California February 26, 1999 EXECU'T`IVE SUMMARY Groundwater monitoring at the Kwikee Food site took place on January 28, 1999. The depth to groundwater in the three monitoring wells was measured with a Solinst water level meter, and a battery-operated purge pump was used to purge the wells of standing water. Fourty-five gallons of water were removed from the wells and stored in a DOT-approved drum on site. After purging, water samples were collected in glass vials and transported to the laboratory and were analyzed for Total Petroleum Hydrocarbons as gasoline and BTEX_ As in May 1998, the present groundwater gradient is southwest, at 0.025 ft/ft. This is in contrast to an east or northeast gradient, which is the more typical pattern. The present gradient demonstrates that the southwest gradient in May 1998 was not a fluke, but was due to Subsurface conditions that apparently prevail only during part of the year. This alternating southwest and northeast flow presumably creates a "sloshing" effect on gasoline hydrocarbons in the aquifer, preventing the contaminants from consistently migrating in one direction away from the. site. As in the past, hydrocarbons were detected in all wells, but at concentrations similar to Vose in the past two monitoring events rather than at the much higher concentrations that were commonplace prior to 1998. This sharp decline in concentrations may be the result of the removal in March 1998 of the two USTs that were formerly present, but it is also possible that the reduction is Niue to the exceptionally high water table that has existed for over a year. Because of the high wate'- table, the screened interval in all three wells is several feet below the soil-groundwater inteiface. It is therefore too early to conclude that the decrease in concentrations is real; additional monitoring, probably supplemented with additional monitoring wells, will be required before a clear picture of contaminant behavior can be developed at this site. f