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Beehtel Corporatfon <br /> July 24, 1997 Terracon <br /> P�ge 2 <br /> 1 <br /> � <br /> Subsurface Exploration Conditlons: We explored subsurtace conditions by drilling one boring <br /> to a depth of 31.0 feet at the proposed monopole location. A continuous log of the test boring was <br /> recorded by our field representative during the drilling operations. At selected intervals, samples <br /> of the subsuAace materials and penetration tests were taken by means of driving split spoon <br /> samplers. The soils were classified in general accordance with the classification system described <br /> in Figure 2. A key to the boring Iog is presented in Figure 3. The boring log is presented in <br /> Figure 4. Ground water measurements were made in the test boring immediately after drilling. <br /> As presented on the boring log, subsu�face conditions consist of 2 inches of asphalt concrete that <br /> overlies silty gravel with sand to a depth of 2 feet. Stift silt was encountered from a depth of 2 feet <br /> to a depth of 8 feet and overlies dense silty fine sand which was encountered to a depth of 24 feet. <br /> Very dense fine sand was encountered from a depth of 24 feet to the bottom of the boring. <br /> Ground water was not observed in the test boring at the time of field exploration. These <br /> observations represent only current ground water conditions, and may not be indicative of other <br /> times or at othor locations. Ground water levels shouid be expected to fluctuate seasanally and <br /> with varying weather conditions. <br /> Laboratory TesHng: Selected samples were tested to determine the natural moisture content and <br /> dry density of the soils. The results are presented on the boring log (n Figure 4. Leboratory swell <br /> and consolidation test results indicate that the near surface soils are non�xpansive and exhibit low <br /> compressibility at in-situ moisture contents. The consolidation test results are presented in <br /> Figure 5. <br /> The results of corrosion tests completed in general accordance with ASTM (American Society of <br /> Testing Materials) methods are summarized in the foilowing table: <br /> Corrosivity Teat Results <br /> Depth Soil Realativlty Sulfatos <br /> (feet) Classiflcat(on pH (ohm�cm) (ppm) <br /> 5.5 ML 6.3 4,'100 <1.0 <br />, 10.5 SM 6.5 20,000 <1.0 <br /> These values shoutd be used to determine potential corrosive rharaderistics of the on-site soils <br /> with respect to contact with the various underground materials which wil� be used for project <br /> construction. <br /> i <br />