SITE INFORMATION AND CORRESPONDENCE

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I STATF nr r'AI IPf1PNIA - Envicoamental Eta& a PFTF Wil Gr1N rnVYmn/ CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION Ii 3443 Routier Road, Suite A Sacramento, CA 95827-3098 PHONE: (916) 255-3000 f1 FAX: (916) 255-3015 2: 02 3 August 1994 Mr. Don O. Culbertson Chevron Pipe Line Company 5080 California Avenue, Suite 400 Bakersfield, CA 93309-1671 SAMPLING RESULTS, CHEVRON PIPE LINE COMPANY, LYOTH LOADING STATION, SAN JOAQUIN COUNTY On 17 May 1994, I received a phone call from Mr. Marvin Hoffman concerning a 10-inch pipe and contaminated soil he uncovered while digging a trench for an electrical supply line on his property which is the site of Chevron's former Lyoth Loading Station (see attached map). I drove to the site that afternoon and collected three samples. One sample was from an approximately 10-inch diameter pipe that was about 1/3 full of a soft petroleum residue. The second sample was from a one-foot thick lens of tar/asphalt-like material, just a few inches below the surface, and the third sample was from the soil around the 10-inch pipe. All of the samples were analyzed using EPA Method 8270 for semi-volatile organics and EPA Method 418.1 for total recoverable petroleum hydrocarbons (TRPH). For all three samples, EPA Method 8270 analytes were not detected. TRPH was measured at 32 ppm in the fust sample, 51 ppm in the second, and 7.8 ppm in the third. A copy of the lab results is attached for your files. Phase II field work was completed in mid-May. Based on the proposed schedule, I expected to receive a report on the results by 13 July 1994. Please submit this report by 12 August 1994. If you have any questions, please call me at (916) 255-3054. DAVID E. JENKINS Associate Engineering Geologist DEJ:Isb Enclosure cc: /Ms. Margaret Lagorio, San Joaquin Public Health Services, Stockton Mr. Ronald E. Hoffman, Tracy Mr. Bill Vizza, Director, Department of Public Works, Tracy