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To assess the potential impact of hydrocarbons on groundwater beneath the site, four <br /> groundwater monitoring wells (MW1, MW2, MW3, and MW4) were installed at the site by <br /> WaterWork Corp (August 1990 and March 1992) Monitoring well locations are shown on <br /> Figure 2 Soil samples collected at the capillary fringe in each well contained non-detectable <br /> gasoline hydrocarbons Groundwater samples collected from the site monitoring wells indicate <br /> that groundwater contamination beneath the site is limited to a relatively small area in the <br /> immediate vicinity of the former tanks Historical results of groundwater analyses are <br /> summarized on Table 3 <br />' 3.0 TECHNICAL DATA <br /> 3.1 Name and Address of Site, Tank Owner, and Contact Person <br /> Site and Tank Owner McAllister Trust <br /> 601 South Ventura <br /> Stockton, CA <br /> Contact Person Mr John C Dieckman <br /> 500 Airport Blvd <br /> Burlingame, CA 94010 <br /> 3.2 Regional Topography/Geology <br /> The site is situated on level terrain consisting of Quaternary to Recent alluvial sediments as flood <br /> basin deposits In general, these sediments are comprised of slits and clays, with minor sands <br /> (DWR, 1967) The regional groundwater gradient is approximately 12 feet per mile to the <br />' northeast (San Joaquin County Flood Control District [SJCFCD], 1992) <br /> In the San Joaquin Valley, the Flood Basin Deposits have been estimated to be as much as 100 <br /> feet thick (USGS Professional Paper 1401-C, 1986) Because of their fine-grained nature, the <br /> flood basin deposits in general do not yield much water to wells and impede the vertical <br /> movement of water The majority of groundwater used for irrigation and drinking water <br /> supplies is extracted from more permeable zones beneath the flood basin deposits The <br /> uppermost water bearing zone beneath the site flows toward the east <br />' PAR 0593 FNL 2 <br /> 1 <br />