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' STATE OF CAUFOANIA PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE Ai <br /> SACRAMENTO, CA 95827-3098 <br /> PHONE: (916) 361-5600 <br /> FAX: (916) 361-5686 <br /> 17 September 1991 <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> P.O. Box 2009 I <br /> Stockton, CA 95201 <br /> MOBIL, 500 EAST GRANT LINE ROAD, TRACY, SAN JOAQUIN COUNTY <br /> I have reviewed the file for-this site and the report "Supplemental Site 1 <br /> Investigation", dated 27 June 1991, prepared by Alton Geoscience. I also <br /> received your recent letter to Mobil , dated 5 September 1991, and I concur <br /> with all comments and requests for submittals. <br /> However, our file is missing some .information which may or may not be <br /> available in other documents: <br /> 1 . The historic depth to ground water (DTW) was not found in our file. The <br /> current DTW is about 10.5 feet. A shallower DTW might explain the soil <br /> contamination at 6.5 feet across Grant Line Road. <br /> 2. Our file has no soil sample results from the side walls and base of the <br /> excavation. This information is useful for determining the <br /> contamination remaining in soils off-site and under Grant Line Road. <br /> If this information is ' available in your files, please forward or have Alton <br /> forward a copy to us. If this information is not available, it will be M <br /> necessary for Mobil to investigate the historic DTW and "off-site soil . <br /> contamination", which you already informed them to do, in your letter. ' <br /> If you have any- questions, please call me at (916) 36175726. <br /> ELIZARE H A. THAYER <br /> Associ`a a Engineer <br />