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C L E A kWkT-E R ' G R O U P Environmental servires 1 sorbed-phase contamination in the area of MW-5B is likely an ongoing source of dissolved-phase ' contamination The core of the plume is located proximal to the former UST pit and MW-5 The maximum extent of the residual dissolved-phase contaminant plume is approximately 275 feet long (parallel ' to groundwater flow) and 130 feet wide (perpendicular to groundwater flow), based on non- detectable concentrations of TPHg (Figure 7) Based on the approximate plume dimensions noted above and the assumption of plume thickness of 15 feet and porosity of saturated zone of 0 35, it is estimated that approximately 1,125,435 gallons of groundwater are affected by gasoline contamination It estimated that approximately 33 lbs or 5 4 gallons of gasoline reside in the dissolved-phase beneath the site (Table 5) The great disparity between mass of contaminants in the sorbed- and dissolved-phase is typical of many gasoline contaminated sites I� lie 4.0 SENSITIVE RECEPTOR SURVEY 4.1 Buildings The nearest commercial building to the contaminant plume is the on-site structure, which operates as Barnes Trucking Facility's office (Figure 2) The leading edge of the dissolved-phase plume is across the street and adjacent to a City of Stockton Fire Station 4.2 Nearby Production Wells Clearwater personnel performed a search of wells within a 112-mile radius of the site This task was accomplished by reviewing files at the Department of Water Resources (DWR) in Sacramento, California, and field inspection of properties immediately adjacent to the site The DWR search indicated the presence of 1 well located within the search area The well is located on the property immediately north of Barnes Trucking Facility, at the southwest corner of the intersection of Charter Way (State Hwy 4) and Fresno Ave (Figure 1) This location is ' upgradient of the contamination source on the Barnes Trucking property at a distance of approximately 400 feet The well was installed to supply water for industrial use, however, the ' property has since been redeveloped with housing ZB 178C CAP 8 November 20,2002