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15 February 2000 <br /> AGE-NC Project No 98-0448 <br /> Page 15 of 33 <br /> Y <br /> I -the current array of ground water monitonng wells and soil borings <br /> I7.0. 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 up-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 the Morman Slough located approximately 800 feet north-northeast of the <br /> subject property Based upon the distance and upgradient direction from the site, it is very unlikely <br /> that impacted ground water at the site represents a significant pollution threat to water in the <br /> Morman Slough <br /> I Drinkingwater near the site is supplied b the Cl of Stockton (California Water Service Cal <br /> pp y h' <br /> Water) from municipal wells First encountered ground water is not used for drinking or irrigation, <br /> Ialthough all ground water in the State of California is considered to be of potential beneficial use <br /> One Cal Water municipal well(Station 73) is located 1,000 feet northwest of the site, while a second <br /> Cal Water municipal water well (Station 37) is located 2,000 feet southeast of the site (See Section <br /> 2 4) Based on the distance and the upgradient to crossgradient direction to the site, the municipal <br /> water well located northwest and southeast of the site poses minimal concern Based on the data <br />' collected from downgradient wells MW-6 and MW-8, the plume does not appear to have migrated <br /> beyond MW-8 <br /> 8.0. SOIL REMEDIATION ALTERNATIVES <br />' Four methods for remediation of hydrocarbon-impacted soil on the site have been evaluated in light <br /> of site-specific factors The methods considered include SVE, ex-situ treatment, in-situ <br /> bioremediation and natural attenuation <br /> I <br /> 8 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 /> Advanced CeoEmironmental,Inc <br />