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PRIVILENweD & CONFIDENTIAL <br /> WORKPLAN <br /> FOR ONE ADDITIONAL SOIL BORING, <br /> MONITORING WELL INSTALLATION <br /> AND <br /> QUARTERLY GROUNDWATER MONITORING <br /> Wells Fargo Bank Property <br /> 49 South Wilson Way <br /> Stockton, California <br /> SJCEHD Site No. 506077 <br /> Ly <br /> BACKGROUND <br /> Phase I Environmental Site Assessment (ESA) <br /> Building Analytics conducted a Phase I ESA of the subject property in October, 1995. The <br /> `r following environmental issues were identified: <br /> According to historical Sanborn fire insurance maps, a gasoline service station existed on <br /> the subject property during the 1950's. <br /> During the site reconnaissance, Building Analytics observed an on-going subsurface <br /> investigation at the former Roek Construction facility adjacent, on the southeast corner of <br /> the intersection of South Wilson Way and Market Street. <br /> The government records research indicated that a Texaco gasoline service station currently <br /> located adjacent, on the southwest corner of the intersection, is identified as a leaking <br /> underground storage tank (LUST) site. <br /> r <br /> Phase II Subsurface Investigation <br /> A Phase II Subsurface Investigation was performed by Building Analytics in February <br /> 1996, to further investigate the potential of an environmental impact by the former on-site <br /> gasoline service station. Soil samples were collected from five Geoprobe borings at depths <br /> of up to 25 feet below ground surface (bgs). All soil samples revealed non-detectable <br /> concentrations for total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) <br /> and benzene, toluene, ethylbenzene and xylenes (BTEX). Total recoverable petroleum <br /> hydrocarbons (TRPHs) were found at concentrations ranging from ten parts per million <br /> (ppm) to 31 ppm, which is well below the Maximum Contaminant Level (MCL) of 100 <br /> ppm as set forth by the Regional Water Quality Control Board(RWQCB). <br /> Based on the above-mentioned analytical results, it was concluded that the on-site soil <br /> contamination, although below regulatory action levels, was likely caused by the spilling of <br /> waste oil and motor oil at the former on-site gasoline service station. There was no <br /> indication of diesel or gasoline contamination. Groundwater was expected at a depth of <br /> approximately 60 feet bgs, and was not sampled during this subsurface investigation. <br /> y 1 197501-WFB,Stockton Workplan <br /> ..r <br />