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PCE has been detected in water samples collected from the City of Lodi domestic well number CW-3 (now abandoned), located 2,500 feet southeast of the site, at concentrations up to 260 pg/1 (09 September 1989). However, other sources of discharged PCE have been confirmed in close proximity to this well location, including Guide Cleaners, which has been identified by the DTSC as a confirmed source for soil contamination in the Lodi area; specifically, during a previous City- wide investigation, concentration of PCE was detected in on-site soil gas. Previous Site Specific Investigations The subject site is within the Lodi ground water investigation area. As designated by the DTSC, the site resides within the Lodi Ground Water Plume - Northern Region; as depicted by the City of Lodi, the site resides within the central local area. In February 1997, AGE performed a preliminary investigation at the site under the supervision of the San Joaquin County Environmental Health Department (EHD) and the DTSC as part of a former leaking underground storage tank (UST) investigation. A total of 19 borings were advanced during the investigation to collect soil, ground water and soil vapor samples. Subsequent laboratory analysis did not detect gasoline, TCE, 1,1,1-TCA, and benzene, toluene and ethylbenzene (BTE) in any of the soil, soil vapor, and ground water samples analyzed; 0.22 ug/1 xylenes were detected in soil vapor sample P1-20'. Laboratory analysis detected PCE, but no TCE, in 22 of 25 soil vapor samples analyzed. The maximum PCE concentration was 10.6 fig/1, detected in two samples, P19 and Pl, collected at a depth of 20 feet bsg from the western edge of the Cain Electrical shop floor and the former UST area, respectively. Thirteen soil samples were collected from soil borings PI through P3 around the former UST area. Laboratory analysis detected PCE, but no TCE, in 6 of 13 soil samples analyzed. The PCE concentrations were above the detection limit of 0.5 micrograms per kilogram (p.g/kg), although the concentrations did not exceed 2.9 ug/kg. One gab ground water sample (P 1 -H2 0)was collected from the former UST area; the ground water sample did not have detectable concentrations of PCE, TCE, petroleum hydrocarbons or fuel additives. Based on the results and conclusions from the AGE-prepared Preliminary Site Assessment Report, a 'No Further Action' letter was issued for the UST at the site by the Regional Water Quality Control Board in 1997. Conclusions From Previous Ground Water Investigations Based on site and surroundings ground water investigations to date, on-site PCE-impacted soil and soil-vapor most likely is limited to the Cain Electrical Works site. At the present time, there is no evidence that the on-site soil and soil-vapor PCE has impacted ground water; PCE was not detected in the one on-site grab ground water sample (P1 -H20)and has not been detected in the adjacent, Advanced GcoEnvironmental, Inc.