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r <br /> Canepa's Car Wash Page 3 <br /> 248 E. Park Street 06 Febmary 2008 <br /> Stockton, CA <br /> 15 January 2008 meeting, the EHD is not currently approving installation of CMT wells <br /> unless it can be demonstrated that the wells can be properly destroyed at the time the <br /> site is prepared for closure, therefore either clustered or nested wells should be <br /> proposed. Before the EHD can approve specific well designs the hydrogeologic model <br /> must be presented to the EHD for review. Submit a work plan addendum that includes <br /> the hydrogeological model and proposed well designs and locations to the EHD by <br /> 14 April 2008. The wells to be set in the plume across each depth interval should be <br /> located where groundwater is suspected to be most intensely impacted. <br /> The high contaminant concentrations detected in MW-5 and the widespread nature of <br /> the plume as demonstrated by the data reported in WPA indicate to the EHD that <br /> remediation will be required for your site. Your consultant should start considering <br /> possible interim remediation to control and minimize plume migration off your site. As an <br /> initial step, submit a sorbed and dissolved contaminant mass estimate with the work plan <br /> addendum. Your consultant may want to review the adjacent site, 610 N. Hunter Street, <br /> which has employed soil vapor extraction (SVE) and groundwater extraction (GWE) to <br /> address contaminants from the underground storage tank release at that site. <br /> Please contact Frank Girardi at (209) 463-7868 with comments and any questions. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Nuel Henderson, PG <br /> Margate Lagon REHS <br /> Engineering Geologist Program Coordinator <br /> C: James Barton, RWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> C: Donald Kresse, Condor, 188 Frank West Circle, Suite I, Stockton, CA 95206 <br /> Work Plan Comment Letter 0208 <br />