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SECTIONFIVE ladoratory and Field Testing <br />5.1 GENERAL <br />Field testing was performed during drilling and consisted of Standard Penetration Tests (SPTs) <br />by driving a 3-inch diameter split spoon or a 2-inch diameter standard split spoon in the alluvium <br />and/or transitions to bedrock. The sampling and in-situ testing was done in general accordance <br />with the procedures ofASTM D1586-99 "Standazd Test Method for Penetration Test and Split- <br />Barrel Sampling of Soils". A representative portion of each split-spoon sample was sealed in a <br />Ziploc plastic bag and labeled. Data from the SPTs are provided on the summary boring logs in <br />Appendix A and are summarized in Section 5. Data from packer testing is provided in Appendix <br />B and is summarized in Section 5.3.3. <br />Laboratory tests were performed on representative samples of the alluvium and bedrock from the <br />borings. Advanced Terra Testing, Inc. in Lakewood, Colorado performed the tests under <br />subcontract to URS. A summary of the laboratory test results are provided in Appendix A and <br />C, and are discussed in Sections 5.2 and 5.3. <br />^ 5.2 TOPSOIL AND ALLUVIAL SOILS <br />Laboratory sieve analyses were conducted on the topsoil and alluvial samples from the test <br />borings and test pits to determine the distribution of gravel, sand, and fines. Tests on the <br />alluvium sandy-gavelly samples consisted of sieve analyses. Sieve analyses and Atterberg <br />limits were performed on the clayey soils. Results of laboratory sieve analyses on the topsoil <br />and alluvial soils are summarized in Appendix A, Figures A-2 through A-5. The laboratory data <br />is also included in Appendix C. <br />Results of the field SPTs done in all of the boreholes indicated the alluvial material rariged from <br />very loose to dense in the boreholes: The results of the SPTs are presented in Appendix A, <br />Figures A-2 through A-4. <br />5.3 FOUNDATION BEDROCK <br />Laboratory tests on bedrock samples consisted of sieve analyses, Atterberg Limits, and <br />Hydraulic Conductivity Tests on core samples of bedrock from TH-19 and TH-22 at respective <br />depths of 33.5 and 28.5 ft. The test results are discussed in the following sections. <br />I 5.3.1 Index Testing <br />Index tests conducted on selected rock core samples included sieve analyses and Atterberg <br />Limits. Results of the laboratory index tests on the rock core samples are presented alongside <br />the boring profiles in Appendix A and the grain size curves are presented in Appendix C, <br />' 5.3.2 Strength Testing <br />Standard Penetration Tests were performed in the field in five boreholes where bedrock was <br />encountered. The results of the SPTs indicated that the bedrock is very dense. The results of the <br />SPTs are presented in Appendix A, Figures A-2 through A-4. <br />N*:\PROJECTS122230240_PLATTE_SAND GRAVEL\SUR_00\120_WORD_PROCIPLATTE SAND 8 GRAVEL GEOTECHNICAL DESIGN REPORT 4.O.DOC\15~NOV-05\\ S- I <br />V i47 <br />