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ENVIRONMV ENTAL HEALTH DEPARTMENT <br /> 'oPqu l N..c0 <br /> SAN JOAQUIN COUNTY Program Coordinators <br /> a Za Donna K. Heran, R.E.H.S. 8 <br /> W ` 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 /> gid'•�- �P Assistant Director Margaret Lagorio, R.E.H.S. <br /> L,FORN Telephone: (209)468-3420 <br /> Robert McClellon,R.E.H.S. <br /> Fax: (209) 464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> AURANGZEB (ZEB) KHAN SEP 0 8 2006 <br /> C/O ADVANCED GEOENVIRONMENTAL INC <br /> 837 SHAW ROAD <br /> STOCKTON CA 95215 <br /> DHILLON CHARAN SINGH ETAL <br /> 2057 S EL DORADO STREET <br /> STOCKTON CA 95206 <br /> RE: Quick N' Save #2 <br /> 2057 S. EI Dorado Street <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed our <br /> file information on the above referenced site. In a letter dated May 18, 2006, <br /> EHD concurred with the recommendations in the "Ground Water Pump Test and <br /> Soil Vapor Extraction Pilot Test Report" dated April 11, 2006, prepared by <br /> Advanced GeoEnvironmental, Inc. (AGE) that soil vapor extraction and <br /> groundwater extraction were viable alternatives for interim remediation at the site <br /> and required a work plan be submitted for the proposal. <br /> In a letter dated August 29, 2006, EHD approved a work plan dated June 20, <br /> 2006, prepared by AGE for installation of a soil vapor extraction system and for <br /> installation of an in-situ air sparge system instead of a groundwater extraction <br /> system. Since that date, Nuel Henderson, P.G. of EHD prepared cross sections <br /> of the subsurface of the site using lithological information from the boring logs. <br /> There appears to be a clay layer potentially five or more feet thick above a sand <br /> unit that is at least 10 feet thick across the site. The clay layer may interfere with <br /> recovering sparged air and vapor through the vapor extraction wells at this site <br /> and potentially induce migration of the contaminants in the groundwater. <br /> Therefore, EHD is rescinding the approval of the in-situ air sparge system for this <br /> site. The proposal for vapor extraction and groundwater extraction as interim <br /> remedial alternatives should be implemented. A revised interim remediation <br /> work plan should be submitted to EHD by October 7, 2006. A technical <br /> justification for in-situ air sparging with a cost analysis can be presented to EHD <br /> if your consultant considers this remedial alternative appropriate. <br />