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Table 6-2 (DHS Table L) QUANTITIES OF CLEANUP WASTES IN THE COUNTY PROJECTED TO THE YEAR 2000 (TONS) 1 . There are 2,611 regulated underground storage tanks (USTs) in San Joaquin County, excluding non-fuel tanks. USTs with double containment total 100; the fuel is not expected to leak into the soil . The UST program has run for 4 years in the County, and reliable information is available. Approximately 123 USTs out of 2,260 USTs tested (90 percent of the regulated tanks) have failed the precision test. However, the correlation between the number of USTs that failed the test and the number of cases of contaminated soil is poor. The number of USTs presently associated with contaminated soil can be inferred from tank-pull data. Tank removals have been undertaken primarily in response to property sales and not in response to expected contamination. Twenty- eight percent of the pulled tanks involve soil contamination from a variety of causes, including (1) leaking USTs, (2) spills, (3) overflow when filling USTs, (3) poor operation, and (4) spillage related to past repairs. In 95 percent of these cases, contaminated soil was treated by aeration. In 5 percent 'of these cases, approximately 69 cubic yards of soil were removed per pulled tank. In 1986 20 USTs and in 1987 25 USTs were removed or changed to double containment _. to avoid future leakage problems. Based on industry's increasing awareness of the problem and continued regulatory pressure, the County estimates that 50 percent of the nonleaking single contaminant USTs (904 USTs) will be removed in time to prevent leakage to the soil . Based on the above data, 703 USTs are estimated to be presently leaking and 904 USTs will leak by 1996. Of these 1 ,607 USTs, 90 percent (1,527 USTs) will in- volve soil treatment by aeration and 80 USTs will involve soil removal . Assuming 59 cubic yards or 88.5 tons per tank removal , approximately 7,080 tons of soil will be removed in the next 10 years, or 708 tons of contaminated soil per year _ (personal communications with Lori Cotulla and Donna Hardin, RWQCB, August 25, and September 5, 1988) . 2. Several old disposal sites are under investigation by the DHS in the County: (1) Forward, Inc. (active) , (2) Cove Contractors (active) , and (3) Arcady Oil (closed) . The soil at Arcady Oil was contaminated by a fuel leak. The list of old- disposal sites and their operational status was provided by OHS (personal communication with Pat Leery of the RWQCB, August 8, 1988) . No information is available regarding projected cleanup waste quantities, due to the early stage of the investigations. PJ9 9390502B.00D 6-16 Rev. 0 11/10/88