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FORME �- R AMERICAN FOREST PRODUCTS 2.0 Background Closure Summary Report July 2009 URS Project 17322736 Page 2-1 2.0 BACKGROUND 2.1 '-SITE SETTING The Site is in the eastern portion of the City of Stockton, in San Joaquin County,California. Development in the vicinity is a mix of industrial, Iight industrial, commercial, and residential.The Site is bordered to the east by a Union Pacific Railroad right-of-way, with light industrial uses and West Lane beyond. The Site is bordered to the south by older single-family residential development, to the west by the San Joaquin rural cemetery. The Stockton Rural Cemetery borders the Site to the northwest, and the former ' American Molding and Millwork facility is-.located to the north,beyond the Union Pacific Railroad right- of-way. The topography of the Site vicinity is generally flat,with a slight slope toward the San Joaquin River which is approximately 5 miles to the southwest. The Calaveras River flows through a lined canal approximately 2%z miles to the north of the Site. ; 2.2 SITE USE HISTORY w AFP operated a lumber manufacturing facility at a 40-acre Stockton facility located at the intersection of Alpine Street and West Lane beginning in 1921 (Dames&Moore, 1987; Kleinfelder, 1987; Dames& Moore, 1994) (Figure 1).The facility remanufactured softwood lumber into furniture kits,cut stock, agricultural boxes, and moldings. Plant equipment and vehicles were serviced at a maintenance shop at the southern portion of the facility. AFP operated the maintenance shop until the spring of 1987,when the property was acquired by American Molding and Millwork.' The maintenance shop was used for storage of plumbing and electrical parts required for building maintenance. Pump islands and fuel storage were associate&with the maintenance shop, as it was also used for servicing forklifts and motor vehicles. Three underground storage tanks(USTs)were associated with the maintenance shop (Figure 2). • Tank 18820001 was north of the maintenance shop and at the east end of a wood-frame building. This building formerly housed electrical equipment and had served as a lunchroom (Floyd Brown and Associates, 1983). This 10,000-gallon UST had been used to store diesel i fuel, and was removed in 1993 (Advanced GeoEnvironmental, 1999). Closure for this UST has been provided by the San Joaquin County Environmental Health Department(SJCEHD, - .2007). • Tank 18820002 was located at the west end of the maintenance shop. This 10,000-gallon UST was used for the storage of diesel fuel, and,was removed in 1988. F1 • Tank 18820005 was a 500-gallon UST located at the east end of the maintenance shop used for storage of waste oil, and was also removed iii 1988. u ' 2.3 SITE ENVIRONMENTAL:INVESTIGATION HISTORY A preliminary site assessment and subsequent soil sampling and analysis were conducted for the 40-acre facility by Bechtel National Incorporated(BNI) in 1985.A Remedial Action Plan(RAP)was prepared in i F 1986 under the oversight of the California Department of Health Services. That 1985 investigation indicated hydrocarbon impacts in soils adjacent to the two maintenance shop USTs. In 1986 the 10,000-gallon diesel tank on the east side of the maintenance shop and the 500-gallon waste oil tank on `� KAWprocewM7361AmcricmFerestlClos Su ary-Rcport-Revl)l.doc '