SITE INFORMATION AND CORRESPONDENCE

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-..I' 1 � f�4 Q�_T�1 Chevron a, ' �d�cr Iwo- Chevron October 3, 1996 r"F OCT I p}{ 1: 45 Mr. Joel Weiss Chevron Pipe Line Company 4000 Executive Parkway,Suite 400 Regional Water Quality Control Board, Central Valley Region San Ramon,CA 94583 3443 Routier Road, Suite A P.O.Box 5059 San Ramon,CA 94583-0959 Sacramento, CA 95827-3098 Subject: Chevron Pipe Line Company's Recommendations for Additional Soil and Groundwater Assessment, Former Lyoth Loading Station-- Tracy, California Dear Mr. Weiss: In an effort to further characterize potential impacts to groundwater at the subject site, Chevron Pipe Line Company(CPL)proposes additional soil and groundwater sampling to better define the downgradiant edge of crude oil impacted soil and groundwater. The objective of this letter is to propose the steps and schedule that will protect human health and the environment and support a consistent approach to historic crude oil impacted sites. As you know, CPL manages many sites where historic crude oil operations have impacted soil and may have impacted groundwater. While each site is unique, a consistent approach acceptable to the Regional Water Quality Control Board, Central Valley Region (CVRWQCB) for historic crude oil-impacted sites will streamline CPL's activities and allow investigation, impact assessments, and remediation as necessary to proceed more rapidly. CPL'S goal for each site is closure based on protection of human health. The process to determine acceptable risks must be based on the current and intended use of the property, soil and groundwater analyses, and an understanding of potential receptors on the property. BACKGROUND A predecessor company to Chevron, Standard Oil Company, owned 13.94 acres of land in Tracy, California from 1910 to 1953. The former Lyoth Loading Station was constructed in approximately 1913 and was used as a transfer point for fuel oil received from Chevron's Richmond, California refinery for loading onto locomotives,rail cars, and trucks. The site consisted of one 55,000 barrel (bbl)and two 35,000 bbl aboveground tanks, a pump station, and associated structures. All improvements except for the pump house and living quarters (i.e., the cottage)have been razed. The site served in this capacity from construction until 1953 when it was sold to Standard Warehouse Company (no relation to Standard Oil Company)which operated a cotton seed oil business. The property was subsequently sold to a group of investors who sold the property to the current owners in 1982. The property, located at 26501 Banta Road, is currently owned and occupied by the Hoffman family who operate a bean harvesting business.