Laserfiche WebLink
i <br /> Messrs Larson and Trommer September 14 2010 <br /> 2969 E. Loomis Road, Stockton;'CA Page 2 of 2 <br /> wells within the 2,000-foot search radius of the site; 2 wells are within 250 feet of the site, 6 <br /> more wells within 500 feet of the site, and an additional 7 wells are within 1,000 feet of the site. <br /> The construction details of most of these wells are not known. In the opinion of the EHD, the <br /> high groundwater usage in the area creates the potential for a high exposure to contaminants <br /> fluxed from the estimated 168,000-pounds of residual contaminant mass. <br /> The EHD does not believe that it would be prudent to consider the site for closure at this time <br /> without some attempt to reduce the potential exposure through active remediation. Dual phase <br /> extraction on impacted media was recently pilot tested; a report of findings is pending, but the <br /> consultant informed the EHD verbally that the results were less than expected and that another <br /> remedial technology would be recommended forfurtherevaluation. If a significant portion of the <br /> more volatile fraction of the residual mass can be removed; the risk and hazard posed by the <br /> residual mass may be greatly reduced. The EHD requests the CUF to reconsider their site <br /> closure recommendation. The EHD welcomes, and requests, CUF comments on these technical <br /> issues. <br /> Questions or comments should be directed to Vicki McCartney.at (209) 468-9852 or to Nuel <br /> Henderson at (209)468-3436. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel Henderson, PG <br /> Senior Registered Environmental Engineering Geologist <br /> Health Specialist <br /> Draft Annual 5-Year Review Update Response.doc -�>- - -�. -:- - -#- ».�. «: .•-�-- w <br />