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ARCADIS BBL <br /> ARCADIS U.S„ Inc. <br /> Infrastructure, environment, facilities <br /> 18470 Old Placerville Road <br /> Suite 110 <br /> Sacramento <br /> California 95827 <br /> Mr. Michael J . Infurna Tel 916.857.0124 <br /> San Joaquin County Environmental Health Department Fax 916843.1965 <br /> 304 East Webber Avenue � .arcrx is-ue.com <br /> Third Floor <br /> Stockton, California 95202 <br /> INDUSTRIAL <br /> Subject: <br /> Amendment to Corrective Action Plan Revision <br /> Former Chevron Service Station 9-4054 <br /> 2103 Country Club Boulevard <br /> Stockton , California Date: <br /> April 5, 2007 <br /> Dear Mr. Infurna : contact; <br /> David M . Evans <br /> On behalf of Chevron Environmental Management Company (Chevron), ARCADIS <br /> U .S. , Inc. (ARCADIS BBL, formerly known as Blasland, Bouck & Lee, Inc.) has Phone: <br /> prepared this letter to propose an amendment to the Corrective Action Plan Revision 916 . 857. 0124 x226 <br /> (CAP Revision) , dated March 30 , 2006 and Response to Comments — Corrective Email: <br /> Action Plan Revisions, dated May 31 , 2006 for former Chevron Station 9-4054 david.evans@ <br /> located at 2103 Country Club Boulevard in Stockton, California. This Amendment to arcadis-us.com <br /> CAP Revision has been prepared pursuant to a phone conversation between Ms. <br /> Tonya Myers of ARCADIS BBL and yourself on March 8 , 2006. The proposed Our ref. <br /> amendments to the CAP Revision associated with Task 2 — Vapor Intrusion Pathway 60045492 <br /> Evaluation include the following: <br /> 1 . The temporary vapor probes will be installed as permanent probes <br /> 2 . Soil vapor data will be evaluated against the Office of Environmental Health <br /> Hazard Assessment (OEHHA) soil screening levels and values calculated <br /> using the Department of Toxic Substances Control (DTSC) derived <br /> screening approach <br /> The purpose of these amendments is to ensure that data collected during the soil <br /> vapor assessment is representative of site conditions and is in compliance with <br /> current DTSC guidelines. <br /> The amended Task 2 of the CAP Revision is presented below: <br /> Imagine the result <br />