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SECOR www secor coin <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 vuc <br /> April 8, 2005 <br /> O <br /> Al, <br /> i <br /> Ms. Devra Lewis FpU/ROT Ops <br /> 11020 SuCalifornianCe teegiona DVrive#00 lity Control Board —Central Valley Region FRtijjTgt4q�TH <br /> Rancho Cordova, CA 95670 <br /> RE: Response to RWQCB Letter Dated March 16, 2005 <br /> L&M Operable Unit <br /> Stockton Parcel 2A <br /> West Weber Avenue and North Lincoln Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.21321.05.0350 <br /> Dear Ms. Lewis: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of the L&M <br /> Operable Unit, addresses comments in the Regional Water Quality Control Board <br /> (RWQCB)'s Review of Work Plan dated March 16, 2005 which was sent in response to <br /> SECOR's Work Plan for Soil Vapor Assessment (Work Plan) dated February 25, 2005 for <br /> the subject site. <br /> RESPONSE TO RWQCB LETTER <br /> RWCQB comments are in italics with SECOR's response below. <br /> 1. The Work Plan only proposes soil vapor monitoring points near the locations of <br /> the SVE wells under the apartment buildings. Because the proposed SVE system <br /> includes extraction wells on the undeveloped portion of the site, the Work Plan must <br /> include monitoring to assess the entire system. <br /> As described in the Work Plan no vapor probes were proposed for the excavation area to <br /> maintain the integrity of the HDPE vapor liner and to ensure maximum vacuum for effective <br /> operation of the SVE system. The SVE system in that area will be monitored by measuring <br /> induced vacuum in existing monitoring, dual phase extraction, and horizontal wells, and <br /> influent vapor concentrations. <br /> 2. The Work Plan includes Figures 3 and 5 to show the layout of the SVE system. <br /> However, the five proposed soil vapor monitoring points are on Figure 5, which only <br /> shows the SVE wells on the undeveloped portion of the L&M OU. The L&M OU needs <br /> to show the locations of all the SVE wells in correlation to the proposed soil vapor <br /> • monitoring points and previous active soil gas sampling locations on one figure. <br /> The figure has been revised and is included as Figure 1. <br /> Stockton Parcel 2A',Agency Response Letter 4-8-05. SECOR International Incorporated <br />