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i <br /> SECTION 2 <br /> I <br /> WORKPLAN <br /> This section describes the Preliminary Groundwater Investigation <br /> Workplan (GW Workplan) which outlines proposed work to <br /> determine if groundwater has been affected by the product in the soil. <br /> The GW Workplan is being submitted to EHD and the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB). Following <br /> determination of the status of the groundwater at the site, we will <br /> propose any necessary remediation measures for review by the EHD <br /> and the CVRWQCB. <br /> AREA GROUNDWATER USE <br /> The area of the investigation site has been an industrial and <br /> "t commercial zone for many years. Potable water in this area is <br /> s� supplied by the City of Stockton. There is no known use of the shallow <br /> _ groundwater in this area. Shallow groundwater is pumped for <br /> irrigation use in the outlying agricultural zones of the Stockton area. <br /> AREA GROUNDWATER.El"ATIONS <br /> Groundwater elevations for the site area were compiled from March <br /> 1990 measurements of San Joaquin County Flood Control and Water <br /> Conservation District (SJCFCWCD), and California Department of <br /> Water Resources (DWR) monitoring wells. There are no known <br /> wells within 500 feet of the investigation site. Groundwater <br /> elevations at the nearby wells for which data are available are <br /> summarized in Table 2-1. Well locations are given by standard <br /> United States Geological Survey notation of Township, Range, <br /> - Section, Subsection, and Well Number. <br /> Figure 2-1 shows these groundwater elevations on an area map for <br /> purposes of estimating groundwater depth and flow direction at the <br /> site. Flow direction appears to have both a northerly and an easterly <br /> component. The exact flow direction and gradient will change over <br /> time and can only be estimated without on site monitoring wells. <br /> 2-1 <br />