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) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8495-5600 TO: GORDON L. BOGGS FROM: ELIZABETH A. THAYER UGT Program Coordinator Associate Engineer /� DATE: 4 June 1992 SIGNATURE: r SUBJECT: FORMER CHEVRON, 2103 COUNTRY CLUB BLVD., STOCKTON, SAN JOAQUIN COUNTY San Joaquin County staff have requested our assistance in obtaining compliance with County requests for a work plan and subsequent investigation. My review of the file revealed the following: 1 . Chevron leased the property from Patrick Craig and operated a service station at the site through 1986. In November 1986, at Chevron's request, three monitoring wells were installed. Soil contamination was encountered in the borings for the three wells and free product was found in well MW1. Water samples were not collected for analysis from the three wells. Depth to water was about 15 feet. 2. Chevron's lease was terminated in January 1987 and Mr. Craig leased the property to a third party (name unknown at this time) . The third party operated the service station and the underground tanks for approximately 5 months, according to Paul Koslow, an attorney for Mr. Craig, in a telephone conversation on 3 June 1992. 3. The six underground tanks and piping were excavated in October 1988. Several of the tanks had visible holes and up to 11,000 ppm TPH was detected in a soil sample. Ground water samples contained up to 62,000 ppb TPH in MW1, 51,000 ppb TPH in MW2, and 2 inches of free product in MW3. 4. A work plan, dated 17 July 1989, was approved by Board staff in a letter dated 14 August 1989. According to County staff, Chevron requested, in a letter dated 9 August 1989, that the County remove Chevron as the responsible party for the site. (The letter is not in our file. ) In a letter to Chevron, dated 7 December 1989, County staff rejected the request and reminded Chevron that the work plan had been approved by Board staff. 5. Quarterly reports have not been submitted regularly. 6. The following three reports constitute the extent of the reported information for this site and were reviewed by staff: A. A "Subsurface Assessment Report" dated 17 November 1986, by Groundwater Technology, Inc. submitted with a cover letter from Chevron dated 5 August 1987;