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1.0 INTRODUCTION <br /> PRC Environmental Management, Inc. (PRC) received Contract Task Order (CTO) No. <br /> 0136 under the Comprehensive Long-Term Environmental Action Navy (CLEAN) Contract No. <br /> N62472-88-D-5086 from the Department of Navy, Western Division, Naval Facilities <br /> Engineering Command (WESTDIV) on June 27, 1991. PRC's first task for CTO No. 0136 is <br /> preparation of this work plan addendum. This addendum responds to comments from state <br /> regulatory agencies on the original work plan submitted by The MARK Group, Inc. (The MARK <br /> Group), on July 30, 1990. <br /> 1.1 BACKGROUND <br /> The Department of the Navy (Navy) currently operates a Naval Communication Station on <br /> Rough and Ready Island, Stockton, California (NCS Stockton). Rough and Ready Island is a <br /> 1,459-acre island bounded by the Stockton Deep Water Channel to the north, the San Joaquin <br /> River to the east, and the Burns Cutoff to the south and west. The island is protected from the <br /> higher surrounding waters by levees. NCS Stockton occupies all but two 13-acre parcels located <br /> in the northeastern portion of the island, which are owned by oil companies and operated as <br /> petroleum depots and transfer facilities. In addition, NCS Stockton leases 405 acres of land for <br /> agricultural use. <br /> NCS Stockton has served as an active military installation since the 1940s when a Naval <br /> Supply Depot was commissioned there. In 1965, the Supply Depot was deactivated and control of <br /> the naval facility was assigned to the Naval Communication Station, which had been on site since <br /> about 1960. <br /> Various industrial and maintenance operations have generated waste at NCS Stockton, and <br /> a variety of waste disposal practices have been used. Investigations conducted by the Naval <br /> Energy and Environmental Support Activity (NEESA) (1984), Kleinfelder (1988), and ERM- <br /> West (1989) identified five study areas as being potentially contaminated with hazardous waste <br /> and requiring further study: <br /> • Former Landfill and Burning Area <br /> • Battery Acid Disposal Area <br /> • Fire Fighting Area <br /> • General Services Administration (GSA) Damaged Container Storage Area <br /> • Polychlorinated Biphenyls (PCBs) and Pesticide Site <br /> 1 <br />