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KLEINFELDER <br /> F"■ <br /> 1 <br /> w The lateral extent of the plume affected with gasoline could not be assessed with the three <br /> -� wells installed during this investigation. It is apparent that the plume of contaminated <br /> 34 feet east of the excavation. Several additional <br /> ground water extends beyond MW-1, possibly off site, to assist in evaluating <br /> wells should be installed in a downgradient position,p Y <br /> the extent of the plume. At least one upgradient hedro hydro11 should carbons also <br /> assess <br /> ornnsanlleo offsite source. <br /> potential for onsite mi;ration of petroleum y <br /> Additional wells may also be needed to evaluate the extent of the product <br /> assess the ground <br /> uld be <br /> ' water. In addition, the depth <br /> adrto� aluate f he tidal cltanlgese n the port of Stockton <br /> �-• <br /> water flow direction over tann <br /> are affecting ground water in this area. <br /> that the plume of impacted ground water may have <br /> Based on concerns by the SJCEHD <br /> affected wells in the area,a well location was conducted. Ten wells within 2 Tt�e wells can <br /> site were located by reviewing agency files and conducting a ground Y <br /> be grouped into two areas. Four monitoring wells are located northwest of the site near <br /> ra the intersection of Pershing Street and Navy <br /> Drive, while five domestic wells and an <br /> industrial well are within crural/residential area south of the site(Plate 7). Both groups of <br /> feet from the site, and are not in a direct downgradieltt <br /> wells are within approximate 2,440 <br /> s position. } <br /> round water affected by gasoline <br /> E <br /> Efforts should be made t remediate both the soil and g be a <br /> beneath the site. Gasoline and its constituent compounds being highly volatile may z <br /> Vapor Extraction Systems (VES) <br /> remediated by using vapor extraction technology. P <br /> remediates soil' by extracting vapors in the soil gores that are in <br /> equilibrium <br /> era g under <br /> absorbed and dissolved constituents and free product. VES systems, P <br /> ble c,;nditions,may also be effective in reducing volatile petroleum cons <br /> favoratituents from <br /> 7 <br /> contaminated ground water. <br /> } •h tl:: f silt.and-find sands.l5oi1 permeability tests of <br /> p►ls�l� peath:tne stte.tortsisttpiedol . _ Y <br /> three samples from the site were made to evaluate the <br /> collected from the nsattura ed zone <br /> r extra <br /> and surrounding the tank excavation. One soil sampleTable 6, Appendix <br /> r <br /> ;N ste <br /> in each of the three monitoring wells was m 5 x 10-7 t permeabilityd for soil 7,2 <br /> 1cnttmetersJsec. The <br /> G). The average permeability ranged fromaffected soil <br /> ccur at depths below 25 feet. As most of <br /> higher permeabilities appear to oapproximately 33 <br /> is in the vadose zone between 23 feet and ground water (at a depth of <br /> feet),VES remedial alternatives are being pursued. Because ground water beneath the site <br /> F18-41-62 <br /> ! copyright 1991 Kleinfelder, Inc. <br /> �•.mia■�cor� <br />