7000 HARDESON RD 2018-01-02 MF Import

I I I APPENDIX B LABORATORY TESTING PROCEDURES A series of laboratory tests were performed during the course of this study to evaluate the index and geotechnical engineering properties of the subsurface soils. Descriptions of the types of tests performed are given below. Visual Classification Samples recovered from the exploration locations were visually classified in the field during the exploration program. Representative portions of the samples were carefully packaged in watertight containers and transported to our laboratory where the field classifications were verified or modified as required. Visual classification was generally done in accordance with the Unified Soil Classification system. Visual soil classification includes evaluation of color, relative moisture content, soil type based on grain size, and accessory soil types included in the sample. Soil classifications are presented on the exploration logs in Appendix A. Moisture Content Determinations Moisture content determinations were performed on representative samples obtained from the explorations in order to aid in identification and correlation of soil types. The determinations were made in general accordance with the test procedures described in ASTM:D-2216. The results of the tests are shown on the exploration logs in Appendix A. Grain Size Analysis A grain size analysis indicates the range in diameter of soil particles included in a particular sample. Three grain size analyses were performed on representative samples in general accordance with ASTM:D-422. The results of the grain size determinations for the samples were used in classification of the soils, and are presented in this appendix. Atterberg Limits The plastic limit, liquid limit, and plasticity index were determined on representative samples in general accordance with ASTM:D-4318. The results of the Atterberg limits are presented in this appendix. California Bearing Ratio Tests A series of California Bearing Ratio tests were performed on a selected sample of the site soils in general accordance with ASTM:D 1883-73, to provide an evaluation of the relative quality and support characteristics of subgrade soils. Representative portions from the sample were compacted in a mold, generally in accordance with ASTM:D 1557-78, in order to obtain a moisture -density relationship curve. Following compaction, a 15 pound surcharge was applied to each sample which was then totally immersed in water and allowed to soak for a period the sample was removed, drained, and a vertical load applied to the surcharged soil with a penetration piston at a constant rate of strain. Measurements of the applied vertical load were obtained at selected penetration depths. CBR test results and moisture -density relationships plotted in terms of percent water content versus percent corrected CBR and dry density, respectively. C