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jClaytOIl Gi011• FPVICES from approximately 10 to 17 feet below ground surface (bgs) in the ,groundwater monitoring wells, which are generally screened from 15 to 30 feet bgs (or 5 to 29 feet in some wells). 2.3 SITE HISTORY This general section of Stockton was originally developed for industrial uses in the late 1800s. Parcel 2A and its vicinity was previously marshland that was reportedly filled with unknown material. Historic use of the area has included residential uses and industrial operations such as bulk storage of petroleum, paint manufacturing, and railroad spurs/sidings. In the early 1980s, the buildings west of Parcel 2A were demolished and apartments were constructed. The industrial structures on Parcel 2A were subsequently removed at some point prior to 1990 and additional fill materials were reportedly placed in this area by the City of Stockton. Until approximately 1917, the Parcel 2A and surrounding properties were generally undeveloped. From around 1917, Union Oil Company operated a bulk distribution terminal at the area bounded by Weber Avenue, Harrison Street, Main Street, and Main Street (Figure 3). The Unocal terminal had a number of aboveground tanks at the site over the years, ranging from 7 to 14 tanks, and from 12,000 gallon to 1,500,000 gallons in capacity. The property at the southwest comer of Main and Lincoln was occupied by Morton Paint starting in approximately 1966, and was used as a paint/primer distribution facility. There were reportedly approximately 10 underground storage tanks at the site, approximately 7,500 gallons each. A former petroleum distribution terminal lies west of the former Unocal facility(across former Harrison Street). This terminal was operated from around 1917 until approximately 1982. This terminal was operated by Tidewater/Associated Oil Company, Phillips Petroleum Company, and L&M Petroleum. Chevron (then Standard Oil) occupied the western portion of that property for a period of time. By 1982, the Stockton Redevelopment Agency(SRA) had purchased all the property constituting Parcel 2A. The existing apartments to the west and the office buildings to the north were in construction phase. The residential area to the south had been cleared, leaving the property undeveloped. Between 1982 and 1990 the SRA demolished the remaining site features and Parcel 2A became vacant land. More recent photographs (1990 through 1999) indicate that Site features remain generally unchanged since site demolition. 3.0 PREVIOUS SITE INVESTIGATIONS This section provides a listing of the reports that document the previous environmental investigations conducted on and around Parcel 2A, which were performed in 1989, 1990, 1995, 1996, 1999, 2000, 2001, and 2002. While it has not been possible to identify all 2 PVSAE$TROJECTS%!W 50]629 Unocal Lincoln and WcbcowkpiND=02Pwkpin(dec02).doc