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CSM AECOM 916 361 6400 tel <br /> 10461 Old Placerville Road 916 361 6401 fax <br /> Suite 170 <br /> Sacramento,CA 95827 <br /> www.aecom.com (� <br /> August 18, 2010 <br /> AUG Z0uji0 <br /> ENVIRumvitN I HEALTH <br /> Mr. James L. L. Barton PERMIT/SERVICES <br /> Regional Water Quality Control Board—Central Valley <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> Re: Cleanup and Abatement Order No. 5-00-707, Case Numbers 390258 and 390014 <br /> 5400 and 5606 Pacific Avenue, Stockton, California <br /> Chevron Site Number 306620(former Unocal Site Number 5098) <br /> Subject: Request for Extension/Proposed Schedule to Re-sample Soil Vapor Wells <br /> Dear Mr. Barton: <br /> AECOM, on behalf of Chevron Environmental Management Company (CEMC), has prepared this letter in <br /> response to the Central Valley Water Board (CVW B) July 21, 2010, Document Review letter regarding the <br /> previously submitted Report of Soil Vapor Well Installation and Soil Vapor Sampling Activities (Report), <br /> dated July 2010. Subsequent to the receipt of the CVW B July 21 letter, you agreed to extend the <br /> response time from July 30 to August 20, 2010. <br /> In the CVW B July 21 letter, you requested that the second round of soil vapor sampling be conducted and <br /> a report provided by September 30, 2010. The second round of soil vapor sampling,as indicated in the <br /> Report,was recommended consistent with regulatory guidance (guidelines published by the California <br /> EPA Department of Toxic Substances Control and the New York State Department of Health)to evaluate <br /> the potential seasonal variations in soil vapor concentrations, in addition to validating the results of the <br /> first event. Consistent with this recommendation, AECOM proposes to conduct the second round of <br /> sampling in October, and to provide a report of the findings by December 3, 2010. The sampling will be <br /> performed consistent with the previously approved work plan and first round of sampling. <br /> If you have any questions regarding this project, please contact Jennifer Johnston at (916) 708-1237. <br /> Sincerely, <br /> AECOM / <br /> Jennifer Johnston, P.E. Brenda Miller, REA I <br /> Senior Project Manager Senior Project Manager <br /> cc: Ms. Stephanie McKenna, CEMC <br /> Mr. Mike Infurna, San Joaquin County Environmental Health Division <br /> Mr. Jay Allen, Stone Bros. <br /> Ms. Nicole Gleason, Downey Brand <br />