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4.0 CONCLUSIONS <br /> Tetrachloroethylene (PCE) was detected in "grab" groundwater samples SB-1 and SB-2 at <br /> concentrations of 2.9 and 1.2 micrograms per liter(µg/L), respectively. Other halogenated volatile <br /> organic compounds(HVOCs)were not detected in"grab" groundwater samples collected from the <br /> Property.In addition,HVOCs were not detected in soil samples collected from five and ten feet bgs <br /> from SB-1 and SB-2. <br /> The concentrations of PCE reported for groundwater samples collected from SB-1 and SB-2 are <br /> below the State of California maximum contaminant level(MCL)for PCE in drinking water of 5.0 <br /> ,ug/L. Whereas the concentrations detected are below the MCL, the detections do indicate that a <br /> release has occurred within the facility. The exact source of the release has not been detected; <br /> however, leakage or seepage from the stained floor area and containment structures are suspected. <br /> Based on the results of this investigation Ceres Associates does not recommend further assessment <br /> or investigation to further evaluate the extent of organics in the subsurface. However, Ceres <br /> Associates recommends installation of appropriate secondary-containment devices and improvement <br /> of handling of PCE and PCE-related materials.If properly implemented the above measures should <br /> assist in preventing further releases and potential impact to subsurface conditions. <br /> Ceres Associates 6 Project CA518-2 <br /> WFB-CMO,Quality Cleaners,Tracy,CA June 8, 1999 <br />