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(VYATC A S S O C I A T E S I N C . empty field at the eastern portion of the site. The property is presently improved with four buildings totaling approximately 79,100 square feet (sq. ft.). These buildings include a 67,000 square foot (sq. ft.) main plant manufacturing building with a detached 1,800 sq. ft. chemical warehouse, a 6,300 sq. ft. former tool and die building, and a 4,000 sq. ft. storage building. The site's main building is a two-story steel-framed structure without a basement. The remaining three structures are single-story steel-framed construction also without basements. The buildings occupy approximately 16 percent of the site with pavement and landscaped areas covering appro..-imately 70 percent of the site (see Figure 2). According to the City of Manteca Planning Department records, the buildings on site were constructed in 1980. The site is accessed via Industrial Park Drive from the north and via Vanderbilt Circle from the west and south. According to the City of Manteca Zoning Map, the site is currently zoned Industrial. A review of PHS/EHD regulatory records, conducted by ATC as part of a Phase I Environmental Site Assessment (ESA), included documentation of previous environmental work performed at the subject site. The following is a summary of previous environmental investigations ascertained from PHS/EHD records: • April 1988 - Wastewater Treatment System Soil Sampling - In April 1988, several soil samples were collected beneath a former line from the plating shop to the wastewater treatment system. Soil samples were collected at five-foot intervals directly beneath the "acid waste pipe", and at one-foot below the pipe at the north, south, and east sections of the pipe, respectively. Soil samples were analyzed for pH, copper, lead, and tin. A review of the analytical data indicates only tin (150-220 ppm) was detected above typical San Francisco Bay area concentrations of 2-7 ppm (USGS Professional Paper 1270, April 1992). • November 1988 - Subsurface Investigation - On November 11, 1988, six soil borings were advanced on the subject property and converted into monitoring wells (Figure 2) under the management of Woodward-Clyde. Although the workplan for this work was on file with PHS/EHD, a report summarizing the findings of this investigation was not. Groundwater samples collected in November 1988 contained nitrate (47-100 ppm) and tetrachloroethene (5.2 ppb), above California's Primary MCLs of 45 ppm and 5 ppb, respectively. • June 1991 - Groundwater Monitoring and Sampling - On June 6, 1991, groundwater samples and water level measurements were collected from the six on- site monitoring wells. The groundwater gradient was determined to be westerly. Groundwater analytical results indicated the presence of 1,1-dichloroethene (18.2 ppb) above the MCL of 5 ppb. This sample was collected from well MW-4 located near the WA16962\REP0RTS\W0RK_PLN.D0C 2