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Clayton <br /> tiLIRa)�11E f�� <br /> r}\i�lT3\Tti <br /> Table 1 <br /> Sites with Documented Environmental Problems <br /> Within a 1-Mile Radius of the Subject Site <br /> (Fuel Leak Sites Within 1/2 Mile Only) <br /> XX <br /> G <br /> Goodyear Tire and Rubber 100 feet South FL <br /> Company Crossgradient <br /> 130 North El Dorado Street <br /> Stockton, California <br /> Car Repair Shop 200 feet Southwest FL <br /> Former Shell Gas Station Crossgradient to <br /> 141 North El Dorado Street Upgradient <br /> Stockton, California <br /> ' FL = Fuel Leak <br /> The upgradient, downgradient, or crossgradient location of a site in relation to the <br /> subject site is based on the regional groundwater flow direction, which is estimated by <br /> reviewing a general groundwater elevation contour map and offsite monitoring wells. <br /> However, this is not always an accurate way to predict groundwater flow direction <br /> beneath the site. There are a number of factors that could influence groundwater <br /> flow direction beneath the site, causing it to differ from the regional flow direction. <br /> A description of the facility of concern to our investigation follows: <br /> C" rgpair shop located at 141, North El Dorado Street. This facility is an automotive <br /> repair shop and the former site of a Shell gasoline station. In 1984, five underground <br /> fuel tanks were removed from this facility. In September 1989 ERM West of <br /> Sacramento, California, conducted a Phase 1 environmental assessment of this facility. <br /> ERM concluded that soil testing within the former gasoline tank excavation and a <br /> tank test of the onsite waste oil tank should be conducted. <br /> In 1990, C.M. Weber Enterprises, the owner of the car repair shop, contracted <br /> Leedshill-Herkenhoff, Inc. of San Francisco, California, to install soil borings and <br /> monitoring wells at the site to determine the presence and extent of contamination. <br /> Analytical results of groundwater samples collected showed that benzene and xylenes <br /> exceeded the Maximum Contaminant Levels (MCL) for the State of California. A <br /> copy of the Preliminary site assessment report prepared for this facility by Leedshill- <br /> Herkenhoff, Inc. is provided in Appendix B. <br /> Because of the upgradient/crossgradient location of this car repair shop and its clow; <br /> proximity to the subject property, groundwater contamination may have been migrated <br /> under the subject site. <br /> -7- <br /> 334240.rep <br />