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Site Background Information: Cain Electrical Company Page 4 of 6 Henshaw Associates, Inc. (Henshaw)performed a subsurface investigation across the City of Lodi in 2000,which included a soil gas(vapor)survey and ground water investigation of the City of Lodi Right-of-Way. A set of samples collected from five locations surrounding and near the site effectively delineated the lateral limits of PCE-impact;soil vapor was not impacted surrounding the site. One of the non-detect sampling points was located directly southwest of the Cain site, in the apparent down-gradient ground flow direction;this sampling point(SC-19)was non-detect for the chemicals of concern,in both ground water and soil vapor. The closest sampling point(C-49)with PCE-impacted soil vapor was located approximately 600 feet southeast of the site, beyond three other sampling locations (C-42, SC-20 and SC-21)with no detection of PCE in soil vapor. 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 µg/l (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 ations 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 µg/l 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 µg/l, detected in two samples, P19 and P1, 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 P 1 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(µg/kg),although the concentrations did not exceed 2.9 µg/kg. Advanced GeoEnvironmental,Inc.