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57 <br /> Terracon <br /> Mr. Randy Schafer <br /> Page 2 <br /> June 23, 1993 <br /> ELI Project No. 20935124 <br /> measurements were taken with each sampling with the split-spoon by driving the sampler with <br /> a 140 pound hammer falling 30 inches. When properly interpreted, the penetration resistance is <br /> a useful index to the consistency, relative density or hardness of the materials encountered. <br /> Groundwater conditions were evaluated in each boring at the time of the site exploration. <br /> All of the samples were returned to the laboratory for further examination, classification and <br /> testing. The testing program was developed under your direction. <br /> Selected split-barrel samples were tested in the laboratory for moisture contents. Tube samples <br /> were tested for moisture contents and density. <br /> Representative portions of the bulk samples of the weathered claystone-sandstone encountered <br /> in the borings were tested for Atterberg limits, moisture density relationship (standard Proctor), <br /> and permeability. The Atterberg limits define the liquid limit, plastic limit and plasticity index of <br /> the soil samples and are used to classify cohesive materials and evaluate their plasticity, <br /> consistency and shrink/swell characteristics. A falling head permeability test was performed on <br /> a representative portion of the bulk sample of clayey material which had been compacted to <br /> approximately 95.6 percent of the material's maximum standard Proctor dry density. A standard <br /> Proctor test (in general accordance with ASTM D 698) was performed to evaluate the percent <br /> compaction of that sample. <br /> As part of the testing program, the samples were examined in the laboratory by a geotechnical <br /> engineer and classified in accordance with the attached General Notes and Unified Soil <br /> Classification System, based on the sample's texture and plasticity. The estimated group symbol <br /> is shown in the appropriate column on the boring logs. A brief description of the Unified system <br /> is included with this report. <br /> The following describes the characteristics of the primary soil and bedrock strata encountered at <br /> the site in order of increasing depths. <br />