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AW %:: Avi V n H iV U U IVI CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD - CENTRAL VALLEY REGION 3443 Rouber Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: Antonia K. J. Vorster FROM: John J. Tomko Senior Engineer Associate Engineer San Joaquin Regulatory c.� DATE: 30 August 1990 SIGNATURE: r l SUBJECT: INTERIM INVESTIGATION WORKPLAN, NAVAL COMMU11ICATION STATION, STOCKTON The Department of the Navy submitted to us on 8 August 1990 a final draft of their Interim Investigation Workplan for the Naval Communication Station in Stockton California. This report was prepared by the MARK Group, Engineers and Geologist, Inc. I have reviewed this report. The facility is located on Rough and Ready Island which is bounded by the Stockton Deep Water Channel to the north, the San Joaquin River to the east, and the Burns Cutoff to the south and west. The island occupies 1,459 acres and is protected by levees because most of the land is below the level of the surrounding water. From 1945 through 1979 this facility was operated by the Navy as a major supply depot. Various industrial and maintenance operations have been conducted at this facility, and a variety of waste disposal practices have been implemented. The Naval Communication Station began operations at this Island around 1960. Approximately 405 acres are currently being leased for agricultural purposes, two 13-acre parcels are owned by oil companies and operated as petroleum depots and transfer facilities. Hydrological features include an eight acre duck pond, an elaborate storm drainage system including a pumping station that discharges to Burns Cutoff, a suspected former stream channel that has been filled-in, and the Burns Cutoff and the Stockton Deep Water Channel . Three previous investigations (NEESA 1984, Kleinfelder 1988, ERM-West 1989) identified five study areas which have the potential for adverse environmental impact. These areas are: 1) Former Landfill and Burning Area. 2) Battery Acid Disposal Area. 3) Fire Fighter Training Area. 4) General Services Administration (GSA) Damaged Container Storage Area; and 5) Ten PCB and Pesticide Sites (Site 5 Investigation) . The NEESA 1984 study consisted of a review of historical records and employee interviews, and concentrated primarily on the landfill and burning areas. It was estimated that approximately 150 to 15,000 cubic yards of hazardous waste may have been landfilled and/or burned at this facility. The Kleinfelder 1988 study included the installation of 80 piezometers (9.0 to 20.5 feet BGS) , 13 shallow zone monitoring wells (13.0 to 17.5 feet BGS) , 5 intermediate zone monitoring wells (28 to 59 feet BGS), and 6 staff plates. In addition, five