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M KLEINFELDER 1 2 CHRONOLOGY OF UST-RELATED EVENTS ' The facility once had four petroleum-hydrocarbon USTs, which consisted of a 10,000- gallon diesel tank and two 6,000-gallon gasoline tanks located near the southwest corner of the main plant building (shown in Figure 2) A 20,000-gallon diesel tank was located on the east side of the facility (not shown) The two 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 USTs were removed in September ' 1989 Following the December 1986 tank integrity test failure, Environmental Science & tEngineering (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 below-ground-surface (bgs) During the April 1987 UST removals, impacted soil was excavated to 28 feet bgs, 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 threegroundwater-monitoring wells (MW-1 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, then piezometers PZ-1 and PZ-2, and air-spargmg well SP-1 in September 1994 PSC 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 tests C23-484517-B0OISAC5R540 Page 2 of 14 August 11, 2005 Copyright 2005 Kleinfelder Inc