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URS <br /> CID) <br /> Nov � s 2002 <br /> November 11, 2002 EN 1 HEA Fl <br /> ENviRo�M <br /> PERMmSER�IC"S <br /> Ms. Devra Lewis <br /> Regional Water Quality Control Board- Central Valley Region <br /> 10365 Old Placerville Road, Suite 210 <br /> Sacramento, CA 95827 <br /> Subject: Confirmation of Changes to Work Plan for Subsurface Investigation <br /> Former Tosco Bulk Terminal No. 10013 <br /> 3505 Navy Drive, Stockton, California <br /> Dear Ms. Lewis: <br /> This letter confirms modifications to the Work Plan for Subsurface Investigation (July 11, 2002) <br /> as discussed per a teleconference dated August 19, 2002 between Ms. Devra Lewis, Mr. Tracy <br /> Sizemore, and Ms. Amy Breckenridge. On July 17, 2002,Mr. Sizemore verified via electronic <br /> mail to Ms. Lewis that ethanol will be included in the fuel oxygenate suite, that grab <br /> groundwater samples will come from the same boring as the soil samples, and that soil samples <br /> will replace the proposed soil gas survey. The work plan was approved on July 19, 2002 by Ms. <br /> Lewis in concurrence with conditions outlined by Mr. Sizemore's electronic mail. <br /> The following additional modifications to the work plan were proposed and accepted by Ms. <br /> Lewis via the teleconference above: <br /> 1. Ground penetrating radar will be used in efforts to locate the fiberglass vapor and condensate <br /> pipelines. <br /> 2. All soil samples will be collected at the proposed depths or at the highest PID reading within <br /> the range of proposed depths. <br /> 3. Two additional Geoprobe®borings will be advanced along the vapor/condensate pipelines. <br /> One will be located near the asphalt patch and one near UST No. 5. At each boring location <br /> soil samples will be taken at 5 and 10 feet bgs and groundwater samples will be taken at 12 <br /> and 25 feet bgs. They will be labeled GP-18 and GP-20,respectively. Formerly labeled GP- <br /> 18 will now be named GP-19, and formerly labeled GP-19 through GP-23 will now be <br /> named GP-21 through GP-25. A revised figure will be supplied in the Subsurface <br /> Investigation Report. <br /> URS Corporation <br /> 500 12th Street, Suite 200 <br /> Oakland,CA 94607-4014 <br /> Tel: 510.893.3600 <br /> Fax: 510.874.3268 <br />