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ID <br /> U <br /> 6.0 CONCLUSIONS <br /> Based on the results of the installation of three monitor wells (MW-3A, MW-10, and <br />' MW-11), groundwater sampling at the Canteen Corporation facility located at 1500 Shaw Road <br /> in Stockton, California, and at the adjacent U.S Chemical Corporation facility, located at 1448 <br />' Shaw Road, the following is concluded <br />' • Soil analytical results from the installation of monitor wells MW-3A, MW-10, <br /> and MW-11, indicated that only one sample of the 17 analyzed had concentrations <br /> above the laboratory detection limits. The interval from 65 to 66.5 feet in <br /> monitor well MW-10 had a benzene concentration of 11 µg/kg and a TPH value <br />' of 1 0 mg/kg. <br /> • The potentiometric surface had a gradient of 0 28 feet per 100 feet to the south <br /> The direction and gradient have remained consistent since gauging was initiated <br /> in June 1993 <br />' • Review of the groundwater analytical data indicates that the significant reduction <br /> in hydrocarbon concentrations continues Via natural attenuation, benzene levels <br /> in monitor well MW-1 have decreased from 11,000 µgll (06/03/93) to below the <br /> laboratory detection limit of 0 3 µg11 TPH concentrations in the same monitor <br /> well have declined from 38,000 µg/l to below the laboratory detection limit, <br />' during the same time frame <br />' • To determine if representative groundwater samples have been obtained in the <br /> past from monitor wells with the groundwater elevation above the screened <br /> interval, monitor well MW-3A was installed adjacent to monitor well MW-3. <br /> 7 <br /> 1 <br />