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ENVIROTO&ENTAL HEALTHtEPARTMENT <br /> P. SAN JOAQUIN COUNTY <br /> =j y Donna K. Heran, R.E.H.S. Unit Supervisors <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,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 /> p Program Manager Telephone: (209)468-3420 Douglas W.Wilson,R.E.H.S. <br /> 9(i iz 6W, Margaret Lagorio,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> MOHAMED/HUDA GUBARY UAN 17 ZON <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#: 000436 <br /> Riverbank, CA 95367 CUF#: 015211 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Soil Vapor <br /> Extraction Rebound Test Work Plan (Plan) dated November 15, 2005 as submitted by <br /> GeoCon Consultants and has the following comments. <br /> This Plan is in response to EHD correspondence dated September 25, 2005, wherein <br /> EHD approved the Dual Phase Extraction (DPE) modification to your remedial actions <br /> and advised you that the use of insitu oxygen releasing compound slurry (ORC) is not <br /> approved. <br /> Comments included in the Plan discussed testing the rebound characteristics of the <br /> existing soil vapor extraction (SVE) system at this site. Due to possible asymptotic <br /> conditions noted with the soil vapor influent contaminant levels, your consultant has <br /> determined that residual contamination in the soils below the site may be at levels <br /> where no further remedial actions may be needed. This rebound test could support this <br /> determination. <br /> EHD has evaluated the Plan as adequate and necessary (H&S 25296.10(c)(3) and it is <br /> approved with the following conditions: <br /> 1. ensure adequate data has been or will be collected to support the conclusion of <br /> asymptotic conditions (concentration vs. time) and, <br /> 2. during the shut down of the vapor wells, ensure that at least three (3) well <br /> volumes of vapor are purged from the wells before sampling and, <br /> 3. the system should be operated at a constant rate for several rounds of sampling <br /> prior to its shut down and, <br /> 4. the atmospheric air should be prevented, or at least minimized from entering the <br /> wells and, <br /> 5. the monitoring procedures shall conform to those in the US Army Corps of <br /> Engineers guidelines. <br />