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1 2.0 SITE DESCRIPTION NAVCOMMSTA Stockton is located on Rough and Ready Island at the west edge of the city of Stockton in California Stockton is located approximately 350 miles northwest of Los Angeles, 75 ' miles east-northeast of San Francisco, and 40 miles southeast of Sacramento The location of NAVCOMMSTA 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 The Island is bordered by the Stockton Deep Water ' Channel to the north and east, and by the Burns Cutoff, to the south and west The western portion of the island was once a tidal marsh which was extensively filled with waste materials, construction ' and grading fills, and dredging sediments from the Stockton Deep Water Channel and from Burns Cutoff UST 817 B-2 was located on the west side of Building 817-B (base fueling station) and south of Davis Avenue Building 917 is located immediately south and west of the UST 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 recent investigations at the facility to assess the potential environmental impacts resulting from these operations and disposal practices Under the Navy's abandoned tank program, abandoned fuel tank 817 B-2 at NAVCOMMSTA ' Stockton was excavated and removed from the site UST 817 B-2 had a capacity of 2,500 gallons and was used to store leaded gasoline Results of preliminary soil sampling after tank removal ' indicate the presence of high levels of contaminants in the soil at the site Table 1 presents soil analytical results from the removal of UST No 817 B-2 CrO162 HSP 0440162urATR1-05x05/93 4