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STATE OF CALIFORNIA PETE WILSON. Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A 's F <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5666 <br /> i <br /> DEC 2 D 1991 <br /> 18 December 1991 <br /> EAVIRONMENTAL HEALTH <br /> PF.;RNIIT/SERVICES <br /> Mr. Stephen Pao <br /> Mobil Oil Corporation <br /> 800 W. Alameda Avenue, Suite 700 <br /> 6iirba0Vk, ,CA `91505" <br /> i <br /> FORMER MOBIL STATION #10-NP4, 2375 TRACY BOULEVARD, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed your °Remedial Work Pian" , "Addendum to Remedial Work Plan" , <br /> and "NPDES Permit Application for Ground Water Automatic Recovery System", <br /> prepared by Alton Geoscience. The remediation proposal involves extraction of <br /> ground water with a proposed recovery well , treatment by activated carbon, and <br /> disposal to the storm drain. A draft NPDES permit has been sent to you for <br /> review and comment. Adoption of the permit will allow discharge to the storm <br /> drain. <br /> I have no objections to the proposed remediation system and discharge. ; <br /> However, once the extraction well is in place and data on the capture zone has <br /> been gathered, the pumping rate must be adjusted and/or additional—extraction <br /> wells installed to encompass the entire plume emanating from the former Mobil <br /> station. Due to the possible presence of one or more additional contamination <br /> sources, cooperative efforts in investigation and cleanup are necessary. { <br /> If you have any questions regarding site remediation, please call me at (916) <br /> 361-5726. Regarding the NPDES Permit, call Alex MacDonald, also at the Board, <br /> at (916) 361-5626. <br /> ELIZAB H A. THAYER <br /> Associ a Engineer <br /> cc: Ms. Laurie Cotulla, San Joaquin County Environmental Health, Stockton <br /> i <br /> i <br />