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+ 1 <br /> • ENVIRON74ENTAL HEALTH OEPARTMENT <br /> )0.P SAN JOAQUIN COUNTY <br /> r� QAC <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borg nan,R.E.H.S. <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> • Program ManagerDouglas W. Wilson, R.E.H.S. <br /> 4�icoa� Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClelton, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ lett Carruesco, R.E.H.S. <br /> MOHAMED/HUDA GUBARY JUN 21 2006 <br /> 4228 GREEN KNOLL RD <br /> SALIDA CA 95368 <br /> RE: Ranch Market Site Code: 2412 <br /> 23569 S. Santa Fe Rd. (APN: 24907012) RO#: 0436 <br /> Riverbank, CA 95367 CUF#: 015211 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Report of <br /> Alternative Remedial Action dated March 2006 as submitted by GeoCon Consultants <br /> and has the following comments. <br /> This report covers the findings of the soil vapor extraction (SVE) rebound testing and <br /> dual phase extraction (DPE) testing conducted during October 2005. <br /> On your behalf, GeoCon proposed to EHD that the use of DPE (SVE and ground water <br /> extraction) in conjunction with ozone injection could effectively remove the residual <br /> petroleum in the area of MW-3. In correspondence dated September 21, 2005, EHD <br /> approved the DPE and rebound testing proposal but did not approve the use of <br /> additional ozone injection until it could be proven that the DPE was feasible and cost- <br /> effective in cleaning up the site. <br /> Conclusions included in the report stated that drawdown of the shallow ground water in <br /> order to expose more soil to the SVE system was not easily accomplished. A large <br /> amount of ground water was extracted during the 68-hour test and the affect on the <br /> ground water levels was insignificant. DPE is not economically feasible for this site. <br /> Results of the SVE rebound test indicated that very little petroleum vapors remain in the <br /> soil and only at vapor wells V-3 and V-5. DPE test data indicated that significant vapors <br /> were removed at MW-3. Your consultant proposed adding MW-3 to the current SVE <br /> system provided at wells V-3 and V-5 and decommissioning the eight (8) other SVE <br /> wells. <br /> EHD concurs that adding MW-3 to the SVE system is adequate and necessary [H&S <br /> Code Section 25296.1 0(c)(3)]. You may take steps to add MW-3 to the SVE system <br /> now. <br />