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ik <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> '" SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Carl Borgman,R.E.H.S. <br /> r z Donna K Heran,R.E.H.S. 304 East Weber Avenue Third Floor <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> • Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • :. �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> act co'Rr' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S, <br /> Program Manager Fax: (209) 464-OI3$ Mark Barcellos,R.E.H.S. <br /> RICHARD BELTHOFF JR JUL 31 2002 <br /> COMPASS GROUP USA <br /> 2400 YORKMONT RD <br /> CHARLOTTE NC 28217 <br /> RE: Canteen Corporation Facility Site Cade: 1727 <br /> 1500 Shaw Road RO#: 000104 <br /> Stockton, CA. 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed "Corrective <br /> Action Plan" (CAP) dated June 11, 2002 submitted by Applied Earth Sciences Inc. <br /> (AES) on June 13, 2002 and has the following comments. <br /> The CAP included data to support conclusions for soil and groundwater lateral and <br /> vertical delineation. The discussions were complete and organized and contained <br /> sufficient information for EHD to concur with your findings that the site investigation <br /> phase has been successfully completed. <br /> Multiple remedial alternatives were evaluated for feasibility in the CAP. Three <br /> alternatives were deemed feasible and were further compared for effectiveness, <br /> implementation, and long-term management requirements. <br /> In addition to theoretical evaluation, site-specific conditions also were evaluated after <br /> AES conducted an "In-Situ Air Spargingl Soil Vapor Extraction (IAS-SVE) Pilot Test". <br /> Based on the results of the pilot test and data obtained from the recently installed air <br /> sparge and vapor extraction test wells, AES concluded that IAS-SVE would be the best <br /> treatment technology compared to the other two feasible alternatives, Enhanced <br /> Bioremediation and In-Situ Well Aeration. <br /> Data collected and complied by AES indicated that a sparge radius of approximately 10 <br /> feet and a soil extraction radius of about 30 feet were obtainable in the mostly clay and <br /> silt subsurface. Conceptual treatment system design estimates included in the CAP <br /> suggested that seventeen air sparge wells and four vapor extraction wells would be <br /> needed to successfully remediate the area impacted by the petroleum release at this <br /> site. In addition to the wells required for IAS-SVE, a compressor, vacuum-generating <br /> system and associated piping and electrical installations were included in the <br /> evaluation. <br />