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GEOMATRIX purpose of the boring was to obtain subsurface information to depths sufficiently below the planned pump station foundation and to obtain a representative bulk sample for R-value testing. Other soil samples also were obtained for further examination and testing. The boring (B-1) was drilled in on 13 May, 1999. The boring was drilled with a truck-mounted CME 55 drill rig using a solid-stem flight auger(6-inch outside diameter). The boring was drilled to a depth of 26.5 feet. The drilling was performed by Cal-Nev Geoexploration of Sacramento, California. Mr. Gregg Beukelman, Staff Geologist with Geomatrix, observed the drilling operations and prepared the field boring log. The soils encountered in the boring were sampled using the modified California sampler (2- inch inside diameter, 2 112-inch outside diameter, with liners). Each sampler was driven 18 inches. The blowcounts for the last 12 inches of driving were recorded on the field boring logs. These blowcounts were used to estimate relative density (or consistency) of the soil. These SPT-equivalent blowcounts are presented at the corresponding sample locations on the boring log (Figure 5). The guide used to determine the density (or consistency) is presented in Table 1. An explanation for the boring to is presented on Figure 4. In accordance with the requirements of San Joaquin County,the boring was backfilled with bentonite-cement grout to the ground surface_ The cuttings were spread near the margin of the property. Selected soil samples from the borings were examined and tested in the laboratory to evaluate their physical characteristics. Samples were tested for dry density, moisture content, g radation, plasticity, and compressive strength. A "R" value test was also performed on a bulk sample of the native soils. The results of this test is used to evaluate asphalt pavement sections. i In the field,the soil was visually classified in general accordance with ASTM Method D 2488 by examining drill cuttings and soil samples.. A field boring log was prepared. The final boring log presented on Figure"5 was based on the field log, examination of soil samples in the laboratory, and laboratory test results. Laboratory test results and the blowcount information are listed at the corresponding sample locations on the boring log.: The results of the gradation, plasticity, and R-value tests are also presented. 1 L �4~ I:1Project15000s153131LE WIs-MAN.DOC