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r 2.0 BACKGROUND 2 1 SITE HISTORY The former AFPC facility (the site) is located dust outside the city limit of Stockton, in San Joaquin County, California (Figure 1) The site covers approximately 40 acres and has entrances at 2801 West Lane and 1811 Marshal Avenue AFPC operated a wood manufacturing plant at the site between 1921 and 1987 AFPC purchased lumber from other mills and manufactured finished products including furniture kits, cut stock, agricultural boxes, and moldings In the spring of 1987, American Molding and Millwork Company(AM&M) acquired the AFPC Stockton site, and currently maintains similar operations there In 1987 the site consisted of several structures which included storage sheds for lumber, various wood manufacturing equipment, offices, and a large maintenance shop located at the southern end of the facility, near the Marshall Avenue entrance (Figure 2) The maintenance shop was used for storage of plumbing and electrical parts required for building maintenance Fork lifts and motor vehicles were also serviced and refueled at the maintenance shop, thus requiring fuel storage and pump islands near the maintenance shop According to site plans three USTs were located in the vicinity of the maintenance shop A 10,000 gallon diesel UST and pump island were located on the western side of the building (Figure 3) On the eastern side of the maintenance shop a 500 gallon ' UST used for the storage of waste lubricating oil and spent solvent and at one time a 325 gallon underground gasoline or diesel tank was installed according to plant personnel, but was evidently removed, although no records of the removal were kept According to plan personnel, these tanks were installed over 30 years ago 2 2 CORRECTIVE ACTIONS A preliminary site assessment and subsequent soil sampling and analysis were conducted by Bechtel National Incorporated (BNI) in 1985 and 1986 (BNI, 1985) In 1986 the 10,000 gallon tank ' on the eastern side of the maintenance shop and the 500 gallon waste oil tank on the western side of the building were taken out of service In 1987 J H Kleinfeider and Associates (JHK) conducted a soil and water investigation (JHK, 1987) The 10,000 gallon diesel and 500 gallon waste oil tanks were removed under the supervision of the PHS-EHD in 1988 A "Feasibility Study/Remedial Action Plan" was completed by Dames & Moore in 1988 (Dames & Moore, 1988) In 1990, the RWQCB became the lead agency and requested a work plan for soil remediation and additional groundwater monitoring Dames & Moore completed this work plan in early 1990 SAC116 07 3 AUGUST 1994 DAMES &L MOORE