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Low concentrations of toluene, ethylbenzene and xylenes were detected in the composite <br /> water sample from drums D-8 through D-12. Upon approval from the City of Stockton, we <br /> recommend that water contained in these drums be discharged into the sanitary sewer. <br /> 5.4 Site Closure <br /> ' GeoAudit does not believe that a significant volume of hydrocarbon impacted soil remains <br /> at the site. It is unlikely that any method of remediation would be effective or cost efficient <br /> ' to mitigate the remaining impacted soil. Furthermore, the impacted soil on-site is likely only <br /> a small fraction of the impacted soil off-site. <br /> ' GeoAudit believes that hydrocarbons detected intermittently in groundwater at the site are <br /> a result of an off-site source. Hydrocarbon concentrations detected in groundwater at the <br /> site are very low; remediation of this groundwater would not be cost-efficient and would .. <br /> ' likely be ineffective. We recommend that the site be approved for closure. <br /> Upon approval from the PHS/EHD, all monitoring wells at the site should be destroyed in <br /> ' accordance with County and/or State regulations. After the wells have been properly <br /> abandoned, a request for site closure should be submitted. <br /> 6.0 LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily <br /> exercised by environmental consultants practicing in this or similar localities. The findings <br /> were based upon analytical results provided by an independent laboratory. Evaluations of <br /> the geologic/hydrogeologic conditions at the site for the purpose of this investigation are <br /> made from a limited number of available data points (i.e. boriugs and monitoring wells) and <br /> t subsurface conditions may vary away from these data points. No other warranty is made as <br /> to the professional recommendations contained in this report. <br /> 1 <br /> r <br /> �ej_1 ti4k 5­"� 14 <br /> V3.WRa.9VY"—S.b9 jP. <br /> t <br />