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Appendix B - Laboratory Testing <br />2001 E. Dyer Road <br />Santa Ana, California <br />GDC Project No. LA-1248A <br />Page B-2 <br />B.3 Moisture Content and Dry Unit Weight <br />The in-situ moisture content of selected bulk, SPT, and Modified California Ring samples <br />was measured by oven drying in accordance with ASTM D 2216. Selected Modified <br />California Ring samples were trimmed flush in the brass/steel rings and their wet weight <br />was measured. After drying, the dry weight of each sample, and volume and weight of the <br />metal containers were measured. The moisture content and dry density were calculated in <br />accordance with ASTM D 2216 and D 2937, respectively. Results of these tests are <br />presented in Table B-1 and included in the boring records in Appendix A. <br />B.4 Atterberg Limits <br />Fine-grained fractions of soils were characterized using the Atterberg Limit tests. These <br />tests include Liquid Limit and Plastic Limit tests to evaluate the Plasticity Index in <br />accordance with ASTM D 4318. For selected samples where presence of organic material <br />was observed both airdried and oven dried Liquid Limit tests were performed to determine <br />whether the samples classified as organic clay or silt (OL, OH) in accordance with ASTM D <br />2487. None of the samples tested had oven dried liquid limits less than 75% of the air dried <br />values and therefore did not classify as OL or OH. The results of the Atterberg Limits tests <br />are included in the boring records in Appendix A, summarized in Table B-1. <br />B.5 Grain Size Distribution and Percent Passing No. 200 Sieve <br />Selected soil samples were dried, weighed, and soaked in water until individual soil particles <br />were separated, and then washed on the No. 200 sieve. The percentage of fines (soil <br />passing No. 200 sieve) was measured in accordance with ASTM D 1140. The washed <br />fraction retained on the No. 200 sieve was then screened on a No. 4 sieve, and the fraction <br />retained on No. 4 was weighed to measure the percentage of gravel. Then, the washed <br />material retained on No. 200 sieve was shaken through a standard stack of sieves in <br />accordance with 8STM D 422 to evaluate the grain size distribution. The results of grain <br />size distribution tests are included in this appendix. The relative proportions (or <br />percentages) by dry weight of gravel (retained on No. 4 sieve), sand (passing No. 4 sieve <br />and retained on No. 200 sieve), and fines (passing No. 200 sieve) are included in the boring <br />records in Appendix A and summarized in Table 8-1. <br />B.6 Triaxial Compression Test <br />A Consolidated Undrained Compression Triaxial test was performed on selected clayey <br />samples in accordance with ASTM D 4767. <br />k GROUP DELTA