SITE INFORMATION AND CORRESPONDENCE_1994-1996

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M E M O R A N D U M CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD • CENTRAL VALLEY REGION 3443 Routier Road, Suite A Phone: (916) 255-3000 Sacramento, California 95827-3098 CALNET: 8-494-3000 TO: Greg K. Vaughn; Files FROM: Gail Wiggett, C.E.G. Senior Engineer Associate Eng. Geologist Waste Discharge/AST Unit Waste Discharge/AST Unit DATE: March 20, 1995 SIGNATURE: SUBJECT: SHELL DISTRIBUTION FACILITY, STOCKTON: REVIEW OF ANNUAL MONITORING REPORT FOR 1994 AND SUMMARY OF SITE STATUS (CASE NO. 3007) I have reviewed the Annual Monitoring Program Report (Annual Report) for 1994 (received 3 February 1995) and the Quarterly Report, Fourth Quarter 1994 for Shell Oil Company Distribution Plant (Shell) at 3515 Navy Drive, Stockton. These reports were submitted by Pacific Environmental Group (PACIFIC) on Shell's behalf. This memo presents my comments on the reports, and additionally provides an overview of the case status. Background Setting, and Monitoring Arrav: This facility is on Rough-and-Ready Island at the Stockton port. It is currently regulated by Cleanup and Abatement Order(CAO) 94-705 (6 July 1994) and Monitoring and Reporting Program (MRP) 94-801 (10 February 1994) . The site was previously regulated under MRP 93- 802, and the Annual Report still erroneously refers to that MRP. Adjacent to the facility on the north is the Stockton Deep Water Channel. To the east is another petroleum company property, Tosco (formerly British Petroleum, BP). To the west is a US Navy reservation. Sandwiched between Tosco and Shell is a parcel owned by Mr. Paul Sullivan. The Sullivan property is a vacant field. Both the Shell and the Tosco/BP property are the subjects of remedial investigations under the Aboveground Storage Tank Act. It is not yet clear whether the plumes of hydrocarbons from these two sites are commingling. Shell has recommended, and I concur, that Shell and Tosco work together, sharing data. Similarly, it is not yet clear whether the Navy site has affected the Shell property. Shell suggests that hydrocarbons found in ground water west of their site and west of Hooper Drive may be from the Navy site. Shell has recently proposed the installation of a monitoring well, MW- 28, west of Hooper Drive, to investigate this. All of these properties are shown on Map 1, attached. Products used, stored, or handled at the Shell Distribution Terminal include: contact water, extraction water, and bulk diesel and gasoline for distribution. The facility includes 10 aboveground storage tanks, a garage, and a loading rack, and has been in operation since 1940. There is a wastewater handling system, consisting of an oil/water separator, a "slop" tank, wastewater holding tank (Tank 14), a fluidized-bed biological reactor, and a treated-water holding tank(Tank 16). Facilities that formerly existed at the site include a railcar off-loading area and a former unlined holding pond. All of these are indicated on the attached map.