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] 2 Chronology of Events The facility once had four petroleum hydrocarbon USTs A former 10,000- gallon diesel-fuel tank and two 6,000-gallon gasoline tanks were located near ' the southwest corner of the main building in the vicinity of monitoring well MW-1 (shown in Figure 2) A 20,000-gallon diesel-fuel tank was located on the east side of the facility The gasoline tanks near the southwest building corner were permanently removed in April 1987 The eastern-most gasoline tank had previously been taken out of service and abandoned in place by removing the fuel and filling it with sand The western-most gasoline tank failed a tank integrity test in December 1986, which initiated the permanent removal of both USTs The two diesel-fuel USTs were removed in September 1989 Following the December 1986 detection of the leak in the western-most gasoline UST, Environmental Science & Engineering (ESE) drilled five borings around the perimeter of the two adjacent gasoline USTs and collected soil samples for analysis ESE's results, contained as an appendix in Anderson Consulting Group's (ACG) December 19, 1991 Problem Assessment Report, (�+� indicated that petroleum hydrocarbon impact in soil extended to a depth of at - � •► least 28 feet Opt -t�` During the April 1987 UST removals, impacted soil was overexcavated to 28 feet, which included the area where ESE had placed their borings Approximately 450 cubic yards of soil, including some 120 cubic yards that was noted to be impacted with gasoline, was land-farmed with guidance from the San Joaquin Air Pollution Control District (SJAPCD) In July and September 1987, ESE installed three groundwater monitoring wells (MW-1 through MW-3) In January 1988, ACG installed wells MW-4 and MW-5 ACG subsequently drilled soil borings 90-1 and 90-2 and installed wells MW-6 and MW-7 in February 1990 and then MW-8 in September 1990 PSC (formerly Burlington Environmental) installed wells MW-9 through MW-13 in March 1994, and piezometers PZ-1 and PZ-2 and air sparging well SP-I in September 1994 FSC performed a soil venting and air sparging pilot test in October and November of 1994 to evaluate the effectiveness of this remediation technology Soil venting test were performed using well MW-I, and air sparging tests were performed using well SP-1 Results of the tests, contained in PSC's February 1, 1995 Final Remediation Plan, indicated that soil venting and air sparging would be effective in remediating hydrocarbon impact Remedial Action Completion Report I he Earth-rains Company Facility 2651 South Airport Way Stockton Cahlornla Prepared for I ttF EART tic RAINS COMPANN Prepared by Philip Services Corp 111r NV1624001D 121197FMStod.tnnlStockloMRemcdi TlComplewn Report doc April 14 2003