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05 May 1997 <br /> AGE-NC Project No 95-0112 <br /> Page 13 of 14 <br />' associated with soil of lower permeability, minimizing the potential for future vertical <br /> migration of contaminants <br /> • SESOIL modeling indicates that future migration of contaminants from soil to ground water <br />' is unlikely Contaminants remaining in soil at the site may degrade naturally over time <br /> • Continued operation of a soil -vapor extraction system will produce minimal benefits while <br /> incurring increasing costs <br /> • Petroleum hydrocarbon concentrations in ground water have shown a steady decrease at the <br /> site since installation of the extraction/sparging system Hydrocarbons were not detected in <br /> the ground water sample collected from MW-1 during the January 1997 monitoring event <br /> and were detected near the detection limit during the April 1997 monitoring event <br /> ' Remediation of ground water appears to have been successful <br /> • MTBE was detected in the sample collected from MW-7, at a concentration of 4 1 ppb, <br /> ' during the January 1997 monitoring event MTBE had not been detected at the site previous <br /> to,or since,the January 1997 monitoring event Therefore, MTBE does not appear to be a <br /> significant contaminant at the site <br /> ' • According to information obtained by AGE, there are currently no potential ground water <br /> receptors (i e ground water wells) located near the subject property <br /> 7 0 RECOMMENDATIONS <br /> ' Based upon data collected at the site, AGE has the following recommendations <br /> • A composite sample should be collected from the stockpiled soil for characterization, and <br /> the soil disposed of appropriately <br /> • The City of Lodi Public Works Department should be contacted regarding the possible <br /> disposal of remaining purge water to the sanitary sewer system <br /> ' • The site should be considered for closure It is unlikely that additional remediation at the site <br /> would be cost-effective or result in a significant reduction of the hydrocarbon mass <br /> • Upon closure certification, all monitoring, vapor and sparging wells associated with the site <br /> - - should be abandoned/destroyed in accordance with local regulations <br /> • <br />