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6 <br /> pile consisted of broken pieces of auto safety glass with no matrix of soils. <br /> High resistivities were obtained from this 'pure' glass pile. The results of the <br /> field resistivity measurements are presented on Plate 11. <br /> Trench Excavation Observations <br /> on March 24, 1988, our geologist observed the sidewalls of and materials <br /> that had been excavated from five narrow trenches at the site. These trenches <br /> had been excavated for the environmental assessment at the site (Woodward Clyde, <br /> 1988) . The trench logs and a sketch of the trench locations are shown on <br /> Plate 12. <br /> LABORATORY INVESTIGATION <br /> The geotechnical laboratory testing program was directed primarily toward <br /> identification and classification of the foundation soils. Testing also was <br /> performed to evaluate the shear strength, volume change, and compaction proper- <br /> ties of the subsurface soils. Testing also was performed to aid in evaluating <br /> how the presence of glass might affect the mechanical characteristics of com- <br /> pacted soils. <br /> Natural moisture content was determined on representative samples. Unit - <br /> total and dry weights were determined on samples recovered from the soil borings. <br /> The natural water content and unit dry weight also were evaluated for each of the <br /> direct shear, triaxial, and consolidation test specimens. Liquid and plastic <br /> limit tests were conducted on selected samples to aid in soil identification of <br /> representative samples that appeared to contain a significant fraction of clay. <br /> The percentage of material finer than the No. 200 sieve, and sieve analysis tests <br /> also were conducted on selected samples to aid in soil identification and provide <br /> inferences to help characterize the stress-strain behavior of the subsurface <br /> materials. <br /> One compaction test (ASTM D 1557) was performed on a bulk sample of native <br /> surface soils present between the ground surface and 8-ft depth. A second <br /> compaction test was conducted after this bulk sample had been mixed with about 20 <br /> percent of glass particles obtained from a glass pile at the site. The 20 <br /> percent glass included particles ranging from coarse sand to fine gravel size. <br /> Sieve analyses of this composite sample were conducted before and after the <br /> �Fl1144A/CC-6 McClelland <br />