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E P 2 8 <br /> Li PEAE 1-F9 i <br /> PERMIT/WiVICE; working To Restore Nature <br /> 3164 Gold Camp Drive <br /> Rancho Cordova, CA 95670 <br /> Phone (916) 852-6690 <br /> Fax (916) 852-6688 <br /> September 14, 1992 <br /> Mr James Escobar <br /> Department of Public Works <br /> City Hall <br /> Stockton, California 95202-1997 <br /> Subject Ground-Water Monitoring, Third Quarter 1992, at Fire Engine Company <br /> No 2, 110 West Sonora Street, Stockton, California <br /> Mr Escobar <br /> This letter report summarizes the results of the third quarter 1992 ground-water monitoring <br /> event performed by RESNA Industries (RESNA) at the request of the City of Stockton <br /> Department of Public Works (City of Stockton) at the subject site (location shown on Plate <br /> 1) Work was conducted on July 16, 1992 The work for this sampling event included <br /> measuring depths to ground water, subjectively analyzing ground water from the monitoring <br /> wells, collecting ground-water samples from the wells for laboratory analysis, and evaluating <br /> the ground-water gradient and direction of ground-water flow beneath the site <br /> BACKGROUND <br /> In April 1987, a 1,000-gallon unleaded gasoline tank was removed and residual hydrocarbons <br /> were detected in the soil remaining under the former tank In April 1992, a 250-gallon <br /> waste-oil tank was removed The locations of the former tank and existing tanks are shown <br /> on Plate 2 The City of Stockton contracted RESNA (formerly Applied Geosystems) to <br /> conduct a subsurface investigation to assess the extent of residual hydrocarbons in soil Our <br /> investigation to date includes drilling eight soil borings, installing four ground-water <br /> monitoring wells, collecting and analyzing soil and water samples for hydrocarbons, and <br /> evaluating changes in the ground-water elevation and inferred flow direction (Applied <br /> GeoSystems, November 20, 1990, Report No 38009-2) <br /> '10 0717jese <br /> 38009-4 <br />