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C-SHADSOFS91.1/1.41 <br /> 12/12/91 <br /> the several inches of soil lying above the asphalt. The lead contamination is <br /> i restricted to the surface soils across the site, even where no asphalt pavement is <br /> present. <br /> t <br /> Fig. 1.5-1b is an isoconcentration map of lead in the surface soil at the study <br /> site. The figure shows the surface soil lead contamination has been defined in all <br /> directions about former Bldg. 5-119, except possibly to the south. Sampling in <br /> this direction was discontinued when Bldg. 5-115 was reached; it is unlikely that <br /> significant levels of lead (greater than 500 ppm) are present in the soil east, <br /> west, and south of the Bldg. 5-115. <br /> The surface area of contaminated soil was calculated by measuring with a <br /> 1 planimeter the area depicted in Fig. 1.5-1b inside the 500- and 1,000-ppm <br /> contour lines. The area contaminated with greater than 500-ppm lead but less <br /> than 1,000-ppm lead is 7,143 ft2; assuming a maximum depth of contamination <br /> of 6 inches, the volume of contaminated soil (500 to 1,000 ppm) is 3,572 ft3. <br /> The area contaminatgd with greater than 1,000-ppm lead is 8,775 ft2, which <br /> represents 4,388 ft3 of contaminated soil. The total volume of contaminated soil <br /> (greater than 500-ppm lead) is 7,960 ft3. <br /> I <br />