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v 171 City of Stockton A68102.02A June 14, 1996 Page 2 volume of soil from the targeted depths with the backhoe bucket. A portion of the soil was then transferred into polyvinyl chloride (PVC) buckets which were then labeled, sealed, and transported to the laboratory. In the laboratory, portions of each sample were removed from the buckets and mixed together to form a composite sample for testing. The composites samples were formulated to represent a particular soil type observed in the field. The soil samples were analyzed for optimum moisture and maximum dry density (Proctor Test) using the American Society of Testing Materials (ASTM) Method D-1557 A and permeability using the ASTM Method 5084. Table 1 provides a summary of the observed characteristics of the soil samples included in each composite sample. Composite Depth Pit Nttmbm Observed Sod CliaracteristiCs Sample Interval Number (feet BSG) R-1 0 to 25 P-2, P-3, Organic CLAY; Black; high plasticity, well developed prismatic structure to P4, and P-7 depth of 4 to 8 cm with fractures to 05 to 2 cm in width; calcium carbonate from trace amount to blebs 2 to 3 mm dia comprising approximately 201'o to 3% of sample. damp; slight organic odor, transitional contact over 6 inches with underlvin2 unit. R-2 0 to 3 P-1, P-5, organic CLAY; Black; moderate to high plasticity, well developed prismatic P-6, and P-8 fracturing at surface 2 to 25 cm in width extending downward to a depth of 4 to 6 cm; trace of fine sand, coarse sand, gravel (to 15 cm dia) and minor blebs calcium carbonate comprising 1% of sample; damp to moist; organic odor, contact with underlying unit is transitional over 6 inches. 8 inch thick accumulation of calcium carbonate with sharp contacts observed at base of unit in P-8. R-3 4 to 55 P-2 Silty CLAY to Clayey SELT; yellowish brown; moderate to high plasticity, no visible bedding, strong calcium carbonate development (present throughout but not providing cementing property); moist; no odor, contact with overlying unit transitional over 4 inches. 5 to 10 P-5 Sandy CLAY; light olive brown; moderately plastic, 20 to 30% fine grain sand; moist, no odor, clay breaks into nodule to 25 cm dia. 4 to 11 P-7 Sandy CLAY; yellowish brown; moderately plastic; 15 to 20016 fine grain sand; no visible bedding, moist, no odor. At 8 feet BSG nodules of clay observed. BSG = below site grade cm = centimeter MITI = millimeter dia = diameter