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• Measurements of the water levels were made in the test holes by lowering a weighted tape into the <br />open holes shortly after completion of the drilling and one to forty days after the drilling was <br />completed. The location of the water levels measured and the number of days subsequent to drilling <br />are shown on the Logs of Exploratory Test Holes. Slotted PVC pipe was installed in test holes 11, 13, <br />14, 16 and 21 thru 26 [o monitor future water levels. <br />LABORATORY fIWESTiGATION <br />The laboratory investigation was conducted [o study [he engineering characteristics of the materials <br />obtained in the lest holes. This section includes a discussion oC the laboratory test procedure and <br />figtues and tables presenting the actual test resWts. <br />Samples obtained From the test holes were examined and classified in the laboratory by the project <br />engineer. Laboratory testing included standard property tests, such as natural moisture contents, dry <br />density, grain size analyses, liquid and plastic limits. In addition tests to determine the swell- <br />consolidation characteristics, mois[tue-density relationships, compressive strengths and permeability <br />rates were completed. Results of the Laboratory testing program are shown on Figures #11 thru #?6 <br />and are summarized in Table 1. The laboratory testing was condutted in general accordance with <br />recognized test procedures, primarily those of the American Society for Testing and Materials <br />(ASTM). <br />• Index Prooerties: In order to identify soils and classify them into categories of similar engineering <br />properties, the Unified Soil Classification System (ASTM D-248'n was toed. This system is based on <br />index property tests, including the determination of natural water content (ASTM D-2216), liquid <br />limits (ASTM D-423), plastic limits (ASTM D-424) and grain size dts[ribution (ASTM D-422). ResW[s <br />of the moisture content, dry density, Atterberg limits and the percent of soil passing the U.S. No. 200 <br />sieve are presented on Table 1. <br />Swell-Consolidation Tests: Swell-consolidation tests were conducted on samples of soils and bedrock <br />from the site in order to determine their compressibility or swell characteristics under loading and <br />saturation. Each sample was prepared and placed and placed in an odometer ring between porous <br />discs. P.n initial seating load of 1000 psf was placed on the sample. The sample was then saturated <br />with water and the perccn[ change in sample height was measured with a dial gauge. Samples which <br />swelled subsequent [o saturation were loaded inuementally until returned to thetr original height the <br />sample height was monitored until deformation practically ceased under each load increment. Samples <br />which did no[ swell when saturated were loaded inuementally until a straight line relationship between <br />load and strain was obtained. <br />The consolidation test procedures desuibed are similar to ASTM method D-2435. ResWts of the <br />consolidation tests are plotted as a curve of the final strain at each inuement of pressure against the <br />log of the aaumulated pressure. Swell-consolidation test resWu are presented on Figures #11 thru <br /># 18. <br />• <br />3 <br />