SITE INFORMATION AND CORRESPONDENCE_FILE 1

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MEMORANDUM CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 255-3000 Sacrapento, CA 95827-3098 CALNET: 8-494-3000 TO: Wendy L. CohenFROM: David E. Jenkins Senior Engineer Associate Engineering Geologist DATE: 15 March 1994 SIGNATURE: y SUBJECT: REVIEW OF REMEDIATION PLAN FOR TEXACO TRADING & TRANSPORTATION AND CHEVRON PIPE LINE COMPANY, DIVIDEND PROPERTY, TRACY, SAN JOAQUIN COUNTY I have reviewed the November 1993 Remediation Plan prepared by Erler & Kalinowski, Inc. for the above-referenced site. The plan is inadequate and must be revised. Background The Dividend Property is approximately 63 acres on the west side of the City of Tracy at the intersection of Interstate 205 and West Byron Road (Figure 1). The property is adjacent to the Southern Pacific Railroad right-of-way and is divided into north and south parcels by the Interstate 205 overpass (Figure 2). The south parcel is undeveloped agricultural land, and the north parcel is partially developed with a Walmart store. Two pipelines, which were removed in the early 1970's, ran parallel to the southwest edge of the Dividend Property between the Southern Pacific Railroad and Byron Road. These pipelines were owned by Getty Oil Company which was bought out by Texaco in the mid 1980's. All of the petroleum contamination in the soil and ground water occurs along this edge of the property and is apparently the result of leaks from the old pipelines. Ground water occurs at eight to 10 feet below ground surface (bgs) and has a gradient to the northeast. Site Investigations In June 1989, Harlan Miller Tait Associates reviewed the site history and reported on probable sources of petroleum contamination. The review stated that no information was found indicating the presence of contamination on the property from onsite sources. In late 1989, Dames & Moore (D&M) conducted soil and ground water sampling on the south parcel. D&M drilled eight soil borings, five along the southwest property line and three within the interior of the property, but took no soil samples from the borings. Bailed water samples from each boring were analyzed for total petroleum hydrocarbons in the diesel range (TPH-D) and for benzene, toluene, ethylbenzene and xylene (BTEX). None of the samples had levels above detection limits. Nine shallow test pits were dug with a with a backhoe to look for obvious indications of near-surface contamination in the southeast corner of the property. Shallow soil samples from four test pits were analyzed for TPH-D and BTEX. All samples collected had detectable levels of TPH- D (up to 2,400 mg/kg) at five feet bgs, but no BTEX fractions.