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' Project 113-26,Page 21 7,0 CONCLUSIONS These conclusions and recommendations are based on the Phase I Environmental Assessment described in this report and are subject to the hinitations set forth to Section S of this report. The purpose of this assessment was to collect information concerning hazardous or toxic materials on or near the study property that may have impacted soil and ground water quality at the site. 7.1 Conclusions Gasoline and its constituents are present in the subsurface soil and groundwater on the study property. The pvsmible source of the gasoline is not clear from the available • information. Although gasoline was present in the soil and groundwater when the tanks were removed in 1988, little was detected in the groundwater morutonng wells onsite until September, 7992. Although there is no direct evidence that off-site sources have impacted the subsurface soils and groundwater at the site, nearby former gas stations pose a potential threat. The Paladin Mileage Center had two 10,000-gallon tanks removed 1n 1988with detectable amounts of gasoline and constituents in the water samples , taken from the tank excavation There has been no response to a June, 1988, County request for further site assessment. The Tracy Auto Stereo building has no environmental records on file with the agencies reviewed for this report However, the building has the construction and design of a former gas station Tanks may have been present at this property. No environmental assessment action has been taken by the owners of these properties, and the extent of groundwater contamination from their former underground tanks 1s unknown 37 Parker Environmental Services 4185 Rialto court 1t 56 CA 94565-6116 Phone (510) 439-1024 Fax ( )