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' 1.0 INTRODUCTION ' PRC Environmental Management, Inc. (PRC), received Contract Task Order (CTO) No. 0162 from the Naval Facilities Engineering Command Western Division (WESTDIV) under ' the Comprehensive Long -Term Environmental Action Navy (CLEAN) Contract No. N62474- 88 -D-5086. This CTO directs PRC to perform an underground storage tank (UST) closure at the U.S. Naval Communications Station (NCS) in Stockton, California. This Tank Closure Plan describes the procedures to be followed during the UST closure and contains the field sampling and analysis plan (FSP), and the quality assurance project plan (QAPjP). The health and safety ' plan for performing the field activities associated with the UST closure is included in this Tank Closure Plan as Appendix A. 1.1 SITE BACKGROUND NCS Stockton is located on Rough and Ready Island at the west edge of the city of Stockton in California. Stockton, located in San Joaquin County, is situated in the north central ' section of the state. Stockton is approximately 350 miles northwest of Los Angeles, 75 miles east-northeast of San Francisco, and 40 miles southeast of Sacramento. The location of NCS Stockton is shown on Figure 1. Rough and Ready Island occupies an area of approximately 1,460 acres. The island, ' which is located at the eastern edge of the California Delta, was created at the turn of the century by the construction of levees and manmade channels. Rough and Ready Island requires ' protection by levees because much of the land is below the level of the surrounding water. The island is bordered by the Stockton Deep Water Channel (San Joaquin River) to the ' north and east, and to the south and west, by the Burns Cutoff. The western and southern sectors of the island are below mean sea level (msl). The western portion of the island was once a tidal 1 marsh, which has been extensively filled with waste materials, construction and grading fills, and dredging sediments from the Stockton Deep Water Channel and from Burns Cutoff. ' In 1945, during World War II, Rough and Ready Island was developed by the Navy as a major supply depot. NCS operations began at Rough and Ready Island circa 1960. In 1965, the ' supply depot operations were deactivated and full control of the facility was assigned to the communication station. The Navy still maintains NCS operations at Rough and Ready Island. From 1945 to 1979, various industrial and maintenance operations were performed at the facility and a variety of waste disposal practices were implemented. The Navy has conducted ' 1 � I