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APPENDIX C <br />LABORATORY METHODS AND RESULTS <br />Laboratory tests were performed on representative soil samples to detect their relative engineering <br />properties. Tests were performed following test methods of the American Society for Testing <br />Materials or other accepted standards. The following presents a brief description of the various test <br />methods used. The result of the laboratory tests is presented on the test boring logs or following <br />this Appendix section. <br />Natural Moisture Content <br />The procedure of ASTM D2216 was used to measure the moisture content of representative <br />samples. <br />Classification <br />Soils were classified visually according to the Unified Soil Classification System. Visual <br />classifications were supplemented by laboratory testing of selected samples according to ASTM <br />D2487. <br />Atterber Limits <br />imits <br />The procedure of ASTM D4318 was used to measure the liquid limit, plastic limit and <br />plasticity index of representative samples. <br />Material Finer than No. 200 Sieve <br />Particle -size analyses were performed on selected representative samples according to ASTM <br />D 1140. <br />R -Value <br />The procedure of ASTM D2844 was performed to determine the potential strength of subgrade <br />and base materials for use in road pavements. <br />Expansion Index <br />The ASTM D4829 procedure was used on selected samples to determine the expansion potential. <br />Sieve Analysis <br />The ASTM D6913 procedure was used to determine the particle size distribution of selected <br />samples. <br />