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' 10 June 1999 <br /> AGE-NC Project No 97-0290 <br />' Page 9 of 26 <br />' has been defined at the site (Figure 3) <br />' 6.0. POTENTIAL IMPACT ON NEARBY SURFACE AND GROUND WATER <br /> Typically, ground water would represent the migration medium for contaminants over significant <br />' horizontal distances Sites located in down-gradient or cross-gradient directions from the subject <br /> property are not likely to be negatively impacted by the subject property The nearest surface water <br /> feature to the site is Mokelumne River, located approximately 2 miles up-gradient from the site <br />' Based upon the distance and up-gradient direction from the site, it is very unlikely that impacted <br /> ground water at the site represents a significant pollution threat to water in the Mokelumne River or <br />' other surface waters <br /> Drinking water near the site is supplied by the City of Lodi from municipal wells First encountered <br />' ground water is not used for drinking or irrigation, although all ground water in the State of <br /> California is considered to be of potential beneficial use The locations of municipal wells were <br /> plotted on Figure 6 and described in Section 2 4 Potential pumping influences from these wells is <br />' not known <br />' 7.0. SOIL REMEDIATION ALTERNATIVES <br /> Soil remediation alternatives considered for evaluation for implementation at the site include soil <br />' vapor extraction (SVE), excavation, in-situ bioremediation and natural attenuation <br />' 7 1 SOIL VAPOR EXTRACTION <br />' SVE is a well accepted method of treatment for hydrocarbon-impacted soil, and has been used at <br /> numerous sites with an excellent rate of success The method is most effective on volatile <br /> hydrocarbons in permeable soil <br /> 711 Principles <br />' For most SVE systems, a vacuum blower is used to volatilize hydrocarbons in the vadose <br /> Y � Y <br />' (unsaturated) zone and draw the vapor into extraction wells screened within the contaminant plume <br /> The hydrocarbon vapor is drawn from the wells and "treated" in one of several possible treatment <br /> units (carbon canisters, internal combustion engines, thermal oxidizers and catalytic oxidizers) Air <br />' injection wells may be installed outside the contaminant plume to increase air flow to the extraction <br /> Advanced GeoEn�iron mental,Inc <br /> I <br />