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CLOSURE REQUEST 5-31-94 <br /> REFERENCES <br /> • Bouwer, Herman. 1989 . The Bouwer and Rice Slug Test - An Update . <br /> Ground Water, v 27, n. 3 , pp 304-309 <br /> Fetter, C. W. . 1988 . Applied Hydrogeology, Merrill Publishing <br /> Company. <br /> For Investigation purposes this site was being treated as a CASE <br /> #1 as outlined in TRI-REGIONAL BOARD STAFF RECOMMENDATIONS FOR <br /> PRELIMINARY EVALUATION AND INVESTIGATION OF UNDERGROUND TANK <br /> SITE, 10 AUGUST 1990 . <br /> V. BENEFICIAL USES <br /> a) Existing beneficial uses as contained in the Regional <br /> Board's Basin Plan, and all potential future beneficial <br /> uses. <br /> The site is within the San Joaquin County Ground Water Basan <br /> Plan. This plan shows that the benefical uses for ground water <br /> in San Joaquin County are Municipal and Domestic, Irrigation, <br /> Stock Watering, Process and Service Supply <br /> Ground water in the Stockton area is suitable for domestic, <br /> industrial, and agricultural usage. The shallow aquifers, similar <br /> to the one an which the monitor wells are developed at this site, <br /> • are basically used for privately owned small volume irrigation <br /> wells . Deeper wells are needed to guarantee water availability <br /> for domestic, municipal, industrial, and agricultural purposes . <br /> b) Well surveys (municiple, agricultural, domestic) <br /> WELL RECONNAISSANCE <br /> A reconnaissance of all wells within a half mile radius of the <br /> site was undertaken by WEGE. This reconnaissance was performed by <br /> reviewing the State Department of Water Resources well files and <br /> visual inspections near the site (see Figure 2A and Table 6) . <br /> i <br /> c) Summary of factors affecting long-term fate of <br /> contaminants <br /> The site lies upon flood plain desposits of clay, salty clays, <br /> silts and silty sands . A shallow aquifer is found approximately <br /> fifty feet below the surface Over-excavation and in-situ vapor <br /> extraction has been used to remove gasoline range hydocarbons <br /> from the soil and ground water beneath the site . The vapor <br /> extraction has removed an estimated 2916 gallons of petroleum <br /> hydrocarbons from the soil and ground water and in doing so has <br /> altered the gasoline range to a degraded gasoline range <br /> hydrocarbons resembling kerosene or diesel . The vapor extraction <br /> • has also removed all of the benzene and most of the toluene, <br /> ethylbenzene and xylenes from the soil and all of the gasoline <br /> page20 <br />