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Area D reportedly contained detectable concentrations of TPH-g, TPH-d, 1,1,1-TCA, and TCE. The soil beneath the concrete bunker area reportedly contained detectable concentrations of petroleum hydrocarbons, 1,1, 1-TCA, 1,1-dichloroethene (1,1-DCE), 1,1-dichloroethane (1, 1- DCA), and TCE. During May 1993, WZI, Inc., conducted a limited soil investigation beneath Areas A and D, and the concrete bunker area. A total of 20 soil samples were collected from three exploratory trenches and six soil borings drilled by hollow-stem auger(Figure 7). This work included drilling a second angle boring and sampling beneath the concrete bunker area. Three shallow trenches were excavated to a depth of about 7 feet bgs in Area A in the vicinity of boring A-2. Low-level concentrations of petroleum hydrocarbons were reportedly detected in soil samples from the trenches. Three additional soil borings were drilled in Area D. Soil samples from these borings contained no detectable hydrocarbons or VOCs. Two vertical soil borings and one angle boring were drilled in the vicinity of the concrete bunker. Soil samples from these borings contained detectable concentrations of 1,1, I-TCA, 1, 1-DCE, 1, 1-DCA, and TCE. 4.2 Passive Soil Gas Survey Passive soil gas surveys were conducted on and in the vicinity of LNC site by the RWQCB between 1989 and 1993 in five separate surveys. During 1993 and 1994, the DTSC conducted additional passive soil gas surveys in the greater City of Lodi area that include the LNC site area. Between 1989 and 1996, a total of 533 passive soil gas samples were collected throughout the City of Lodi of which approximately 119 passive soil gas samples were distributed throughout the northern portion of the city. Of these, approximately 17 passive soil gas samples were collected north of Turner Road in the vicinity of the former Italian Swiss Colony Winery and the City of Lodi Landfill (Figure 5). In addition, three passive soil gas samples were collected on the LNC property and an additional 24 passive soil gas samples were collected on adjoining properties (NERI, 1996; Henshaw, 2001). M ain\D:AEnvironmenta1\LN CV\10152007.wpd 16