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. ! Site Background Information: Cain Electrical Company Page 5 of 6 One grab groundwater sample(P1-H20)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 surrounding 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 (P1-1120) and has not been detected in the adjacent, down-gradient City of Lodi Well CW-2, nor in samples from the adjacent City of Lodi site investigation.The lack of on-site PCE-impacted ground water suggests that the Cain Electrical site may not be a contributor to the Lodi Ground Water Plume. Although TCE is a city-wide problem as one of the contaminants of concern of the Lodi Ground Water Plume,it was not detected in soil, soil-vapor and ground water samples collected during the 1997 Cain Electrical preliminary site assessment,nor was it detected in analytical data collected from city right-of-way adjacent to the site by Henshaw in 2000. AGE and Cain Electrical Works have concluded that the TCE detected in City of Lodi Well CW-2 adjacent to the site is likely from an alternative source, not Cain Electrical Works. As a result of the 1997 site investigation, AGE has identified an area in the northern portion of the site as a location of PCE-solvent impact to subsurface soil. The solvent discharge location most likely is located in the northeast corner of the site at the in-ground clarifier,and/or possibly the inside working area of the motor and pump repair facility. ADDITIONAL SITE ASSESSMENT - MONITORING WELLS On 12 and 13 August 2004, monitoring wells MW-1 through MW-4 were installed. Wells MW-1 and MW-4 were screened from approximately 45 feet to 65 feet bsg and approximately 44 feet to 64 feet bsg in wells MW-2 and MW-3. • A total of 17 soil samples were analyzed by CTEL for total petroleum hydrocarbons quantified as gasoline, diesel, stoddard and oil, volatile organic compounds and fuel additives. Six soil samples were analyzed for CAM17 Metals. No VOCs, solvents, fuel Advanced GcoEnvironmental,Inc.