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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> F—*r, -u Z Donna K. Heran, R.E.H.S. Unit Supervisors <br /> in: 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 /> �.. — Program Manager Douglas W.Wilson, R.E.H.S. <br /> Telephone: (209)468-3420 g <br /> 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 /> SWARAN CHOUHAN NAR 14 2006 <br /> 3035 MAYTEN CT <br /> STOCKTON CA 95212 <br /> RE: K & S Gas & Grocery Site Code: 2512 <br /> 701 E Charter Way <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Revised Feasibility Study Work Plan (WP), dated 28 February 2006, <br /> prepared and submitted by Advanced GeoEnvironmental, Inc. (AGE) on your <br /> behalf to address the directive issued by EHD by letters dated 28 September <br /> 2005 and 13 February 2006 to initiate interim groundwater remediation to reduce <br /> the dissolved contaminant mass and gain hydrological control of the shallow <br /> portion of your groundwater plume. <br /> The WP proposes to advance three soil borings to be completed as soil vapor <br /> extraction (SVE) wells and two borings to be completed as groundwater <br /> extraction (GWE) wells, and to conduct an SVE pilot test and a GWE pilot test. <br /> The SVE wells will be advanced to a total depth of 35 feet below surface grade <br /> (bsg), the GWE wells will be advanced to a total depth of 65 feet bsg. <br /> EHD approves the WP as proposed. As part of the analytical regimen of soil <br /> samples, it may be beneficial to analyze representative, uncontaminated samples <br /> for total organic content (TOC) and soil oxygen demand (SOD) to evaluate the <br /> potential for ozone (or other oxidizing agent) injection if needed at a later time. <br /> Your consultant's concern with pulling in contamination from the nearby eastern <br /> and western sites was noted in the WP. If this seems to be a potential concern, <br /> an amended work plan should be submitted to install sentinel well(s) to detect <br /> such plume movement. The plume on the site toward the west does not seem to <br /> have much potential to impact your site as it is a significant distance down- or <br /> cross-gradient from your site. <br /> As noted in the 28 September 2005 and 13 February 2006 letters, it is necessary <br /> to continue the vertical and lateral assessment of your plume. Monitoring wells <br /> previously approved by this office have not been installed. Your consultant has <br /> inquired whether or not the multilevel wells can still be installed on and near your <br /> site. The use of multilevel wells on contaminated sites has resulted in difficulties <br /> with properly destroying the wells. As your site does not fit EHD's profile of sites <br />