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AGS <br /> 3.1 .3 Proposed Site Investigation <br /> The objective of the site investigation at the Buildings 12, 410A and 508 OWS sites is to <br /> collect data sufficient to characterize and delineate potential residual soil and <br /> groundwater contamination at the OWS sites. The general approach for the site <br /> investigation at each OWS site is outlined in the subsections below. <br /> Building 12 OWS. Seven soil borings are proposed to be completed at the Building 12 <br /> OWS site (Figure 3). The boring locations at the Building 12 OWS site take into <br /> account the layout of the OWS system at the site and groundwater flow direction. Five <br /> of the seven borings (B12-2 through B12-5) are located in the immediate area of key <br /> components of the OWS system. These borings are positioned directly adjacent and <br /> downgradient of the wash pad catch basin/drain pipe, a drain pipe elbow, the OWS and <br /> adjacent waste oil pipe, the waste oil tank. and the junction of the OWS discharge pipe <br /> with the sanitary sewer line. Two additional borings (B12-1 , -7) are located at the <br /> upgradient and downgradient margins of the OWS site. Soil samples will only be <br /> collected for chemical analysis from the five borings located in the immediate area of <br /> the OWS system. These samples will be collected for the purpose of characterizing ar.d <br /> delineating maximum vadose zone chemical concentrations in the OWS area. Scil <br /> samples will not be collected for chemical analysis from the two other, up- and <br /> downgradient borings because it is considered unlikely that vadose zone contaminants <br /> would extend the approximate 15-ft distance between these borings and the nearest <br /> component of the OWS system. Grab groundwater samples will be collected from all <br /> seven borings to aid characterization and delineation of potentially impacted <br /> groundwater. Table 1 lists all soil borings by OWS site and includes the purpose of <br /> each boring. <br /> Building 410A OWS. Seven soil borings are proposed to be completed at the Building <br /> 410A OWS site (Figure 4). The boring locations at the Building 410A OWS site take <br /> 11 <br /> `.\LAURA\C1WpannoC\WPCCCF,95-CLTS\1995\950304p1Wow PlanPNom Pan coc <br />