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SHAN WI LS ON,INC convenient and consistent comparison of soils from widespread geographic areas. Using this ' method,the soils are classified using the USCS. The individual sample classifications have been incorporated into the boring logs presented in Appendix A. 4.1 Index Tests 4.1.1 Water Content Determination I The natural water content of select soil samples recovered from the field exploration was determined in general accordance with ASTM Designation D 2216, Standard Method of ' Laboratory Determination of Water(Moisture) Content of Soil and Rock by Mass. Comparison of water content of a soil with its index properties can be useful in characterizing soil unit weight, consistency, compressibility, and strength. Water content,where tested, is plotted on each of the boring logs presented in Appendix A. 4.1.2 Grain Size Distribution Analyses Grain size distribution analyses were performed on two samples in general accordance with ASTM Designation: D422, Standard Method for Particle-Size Analysis of Soils or D1140, Standard Test Methods for Amount of Material in Soils Finer than No. 200 (75-microgram) Sieve. The general procedures to determine the grain size distribution of a soil sample include ' sieve analysis,hydrometer analysis, combined analysis,and percentage of fines passing the No. 200 sieve. 1 Grain size distributions are used to assist in classifying soils and to provide correlation with soil properties, including permeability,behavior when excavated, capillary action, and sensitivity to ' moisture. Results of the grain size analyses are shown on grain size distribution curves shown in Figure B-1. Along with each grain size distribution is a tabulated summary containing the group symbol according to the USCS, the sample description,percentage of fines passing the No. 200 sieve, and the natural water content. 4.1.3 Atterberg Limit Determinations Atterberg Limits were determined on one sample of fine-grained soil in general accordance with ASTM Designation: D4318, Standard Test Method for Liquid Limit, Plastic Limit, and Plasticity Index of Soils. The Atterberg Limits include Liquid Limit(LL), Plastic Limit(PL), and Plasticity Index (PI=LL-PL). They are generally used to assist in classification of soil,to I indicate soil consistency(when compared with natural water content), and to provide correlation to soil properties including compressibility and strength. The results of the Atterberg Limits 21-1-21962-003-R2.docx/wp/cp 21-1-21962-003 4