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i <br /> • ENVIRO&ENTAL HEALTObEPARTMENT <br /> Ppulry <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> " Director 304 East Weber Avenue, Third Floor Cad Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> cq ::. �c • Program Manager Douglas W.Wilson,R.E.H.S. <br /> /FOPN La*ie A.Cotulla,R.E.H.S. Telephone: (209) 4'68-3420 Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> MOHAMED/HUDA GUBARY JUN 1 5 2005 <br /> 4228 GREEN KNOLL RD <br /> SALIDA CA 95368 <br /> RE: Ranch Market Site Code: 2412 <br /> 23569 S. Santa Fe Rd. RO#: 000436 <br /> Riverbank, CA., 95367. CUF#: 015211 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Ground <br /> water Monitoring and Remedial Status Report dated May 2005 as submitted by GeoCon <br /> Consultants and has the following comments. <br /> This report covered ground water monitoring and sampling activities conducted during <br /> the Second Quarter- 2005. <br /> Comments included in the report described calculations and amounts of petroleum <br /> removed by the ozone treatment system up to and including December 2004. GeoCon <br /> stated that the ozone system has been non-functional since December 2004 and cannot <br /> be repaired since parts are not available and the manufacturer is out of business. <br /> Your consultant has recommended that the existing soil vapor extraction (SVE) system <br /> remain operational and not replacing the ozone system since contaminants of concern <br /> are below the maximum contaminant levels (MCL), with the exception of benzene in the <br /> ground water sample from MW-3. <br /> As an alternative, your consultant recommends that an interim remedial effort be <br /> implemented to reduce contaminant mass in the soil and the concentrations in the <br /> ground water. This interim activity would be the use of a high vacuum dual-phase <br /> extraction (DPE) system (SVE and ground water extraction). <br /> The DPE process is be tested for 5-days. During this period, up to 20,000 gallons of <br /> contaminated ground water is to be pumped from MW-3 as SVE operations proceed. In <br /> addition, GeoCon is recommending later injection of an oxygen-releasing compound <br /> (ORC) into the saturated zone in the vicinity of MW-3. <br /> An understanding of the current dissolved contaminant mass at the site is needed <br /> before EHD can effectively evaluate the need for further remediation or a change in the <br /> approved remedial action plan. <br />