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. 2.0 BACKGROUND' 2.1 Site Description Colberg Boat Works is located south of Fremont Street on the Stockton Deep Water Channel commerciallmdustnal area of Stockton, Cahfomia. The site's elevation is approximately 10 to 15 ' feet above mean sea level The area of the site is approximately 16 acres It is currently inactive, but has been previously used as a ship yard to construct, maintain and retrofit ships and boats ranging from Navy ships to ' smaller pleasure boats A number of large buildings and workshop facilities are still located on site, including a metal ' welding shop, warehouses, a sheet metal shop, machine shops, various outfitting wharfs and hoists which were used for repairing and outfitting boats and ships ' 2.2 Previous Investieations On May 16, 1986, Jim Thorpe 011, Inc , removed two 550-gallon diesel, one 8,000-gallon diesel and one 1,000-gallon gasoline underground storage tanks (UST) from the site The area around ' the gasoline UST was overexcavated in 1988 In February 1993, Telic Engineering Corporation (TEC) of Stockton, California, performed a Phase 1 investigation of the subject site and the surrounding area in a 1 mile radius TEC's findings are summarized in their report "Phase 1 Preliminary Hazardous Materials Site Assessment" dated July 21, 1993 2.3 Adiacent Land Uses The site lies in a commercial/industnal area of Stockton, California, along the Stockton Deep ' Water Channel (Figure 1) The subject site is presently bounded on the north by Lindsay Avenue, on the west by a boat shop, ' and on the east, on the east and northeast by several industrial facilities Interstate 5 1s located to the west of the site and, where it crosses the channel, restricts access to the Colberg Boat Works site by larger ships ' 2 4 Geoloi:v Regionally, the property is located within the Central Valley province - a large elongated northwesterly trending trough containing a thick accumulation of sedimentary rocks ranging in age tfrom Jurassic to recent. The Central Valley 1s divided into the Sacramento and San Joaquin basins with the dividing point between the two at the Mokolumne River Stockton 1s located within the northern portion of the San Joaquin Basin The Stockton fault, a northeasterly-trending fault zone ' which crosses the valley at roughly right angles just south of Stockton, is the only significant structural feature in the area 1 - Please II Site Assessment Report COLO] O01 January 23, 1995 Page 2 1