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�i <br /> rk 404 WEST FREMONT STREET <br /> WKA No. 1628.02 <br /> September 2, 1994 <br /> Page 7 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on review of past work at the site and findings from our present investigation, soil and <br /> Fii� <br /> ground water contamination are present beneath the site. The lateral extent of the gasoline <br /> contamination in soils appears to be limited to the immediate vicinity of the former UST. <br /> F, Gasoline contaminated soils have been detected at a depth of 18 feet below grade beneath the <br /> former tank, and likely extends vertically to ground water, based on the floating hydrocarbons <br /> Fobserved in well MW-1, and the fact that well MW-1 is downgradient from the former tank. <br /> Gasoline contamination in ground water continues to appear concentrated to the north, west, and <br /> east of the former UST based on elevated concentrations of TPH-g and BTEX in samples from <br /> wells MW1, MW3, MW4, MW5, and MW6. Ground water contamination to the southeast of <br /> F n lack of detectable concentrations of TPH- in <br /> the former UST appears minimal based o the acg <br /> samples collected from well MW2 during the last two quarterly sampling events. The northerly <br /> F ground water flow beneath the site suggests that any southerly migration of petroleum <br /> Fhydrocarbons in ground water has been minimal. <br /> i <br /> Based on a lack of ground water data south of the former tank, we propose obtaining a water <br /> F] sample from the well immediately adjacent to the southern property boundary, located on the City <br /> of Stockton property. If permission is not granted to sample this well, we recommend installing <br /> F" one additional well along the southern boundary. <br /> We recommend continued ground water monitoring on a quarterly basis, to further evaluate <br /> ground water movement beneath the site and adjacent properties. Data gathered during <br /> monitoring well assist in evaluating the influence tidal and seasonal ground water fluctuations <br /> khave on ground water and contaminant movement beneath the site. <br /> r., Once sufficient data is collected regarding ground water flow direction and the extent of ground <br /> water contamination, we recommend that ground water aquifer testing be conducted. The goal of <br /> I aquifer testing is to obtain sufficient information to design an appropriate efficient remediation <br /> System. <br /> INK <br />€ WALLACE•KUHL <br /> Recyeledpgp &ASSOCIATES INC. <br />� i <br />