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1 <br />All soil samples not initially selected for laboratory analysis will be <br />frozen and placed in storage for possible subsequent analysis, if needed to <br />further define the distribution of residues. <br />4.2.1.4 Gas plant residue distribution maps <br />' Vertical and horizontal gas plant residue distribution maps will be <br />developed for soils at the Tracy site using field and laboratory analytical <br />results of soil sampling and interpolation between sampling locations with <br />' known residue concentrations. These maps will provide a graphic <br />representation of the distribution of gas plant residues across the Tracy <br />site. A complete list of laboratory results for all soil samples analyzed <br />will be included in the final report. <br />' 4.2.2 Define the vertical and horizontal distribution of &asRlant <br />residues in the uppermost aquifer around the site perimeter <br />4.2.2.1 Monitoring well locations and construction <br />Four monitoring wells will be installed in addition to the six wells <br />r] <br />3542a/BAV102 12 <br />currently located onsite. These wells will be constructed from four of the <br />soil borings described in section 4.2.1. The existing and proposed well <br />locations are shown in Figure 2. <br />Three of the proposed wells will be screened from approximately 3 feet <br />has been <br />above to 15 feet below the encountered water table (which <br />previously defined at approximately 9 feet below the ground surface), as <br />are all of the existing wells. These wells will serve both as piezometers <br />(screen length will allow monitoring of seasonal water table fluctuations) <br />for flow direction and gradient determinations and as groundwater sampling <br />points. One of the proposed wells will be located near the southwestern <br />edge (which is estimated from water level data collected during the 1987 <br />site investigation to be the hydraulically upgradient edge of the property), <br />one along the eastern edge near the center, and one near the northeastern <br />corner of the site property (which is estimated to be the hydraulically <br />downgradient edge of the property). <br />r] <br />3542a/BAV102 12 <br />