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Problem Assessment Report November 20, 1990 <br /> t Fire Engine Company No. 2, Stockton, California AGS 38009-2 <br /> CONCLUSIONS <br /> The purpose and results of installing each soil borings and converting appropriate soil <br /> borings to ground-water monitoring wells are presented in Table 11. The results of this <br /> investigation indicate the following; <br /> o Gasoline was detected in soil samples collected from soil boring B-1;gasoline <br /> was not detected in soil near borings B-2 through B-8. <br /> o Dissolved gasoline was detected in ground water collected from monitoring <br /> p! well MW-1 and well MW-4; gasoline was not detected the. ground water in <br /> wells MW-2 and MW-3. <br /> o Soil with residual gasoline is restricted to the area adjacent to former <br /> unleaded gasoline tank(T-5);water with dissolved gasoline is restricted to the <br /> area approximately 250 feet north of tank T-5 and 100 feet east and west of <br /> tank T-5. <br /> o The flow direction of the ground water beneath the site varies, possibly due <br /> to tidal influence in nearby bodies of surface water. <br /> as o The geology beneath the site is characterized by interfingering clay, silt, and <br /> sand deposits. These deposits are common in fan deposits and stream <br /> deposits of the Modesto Formation. <br /> w <br /> APV1 ed GevSystems <br />