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SOIL ASSESSMENT FOR PROPERTY ACQUISITION <br /> Intersection of Interstate 205 and Grant Line Road <br /> Tracy, California <br /> Delta Project No. 40-89-052 <br /> Page 9 <br /> Surface samples from soil borings SB-1, SB-3, SB-4, SB-5, and SB-6 were selected to represent <br /> pesticide/herbicide residues in surface soils (where pesticide/herbicide constituents are applied to <br /> and retained in soils). <br /> Following sample retrieval, each sample collected in a brass tube was immediately capped, labeled, <br /> and stored on ice for delivery to the laboratory. <br /> 5.4 Grouting of Soil Borings <br /> All soil borings were grouted from the bottom of the borehole to ground surface on July 20, 1989, <br /> immediately following completion of drilling activities. Approximately 1 cubic foot of bentonite <br /> was placed at the bottom of each borehole prior to grouting. The grout consisted of a cement/sand <br /> slurry and was tremied into each borehole. <br />