6202 ASSOCIATED BLVD Geotech Report 2022-10-25

APPENDIX B LABORATORY TESTING PROCEDURES AND RESULTS A series of laboratory tests were performed by ZGA and a subcontract testing laboratory 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 moisture tight containers and transported to our laboratory where the field classifications were verified or modified as required. Visual classification was generally done in accordance with ASTM D2488. Visual soil classification includes evaluation of color, relative moisture content, soil type based upon 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. Moisture contents are presented on the exploration logs in Appendix A. Laboratory Maximum Density Test The laboratory maximum density represents the highest degree of density which can be obtained from a particular soil type by imparting a predetermined compaction effort. The test determines the "optimum" moisture content of the soil at the laboratory maximum density. The laboratory maximum density test was performed on a bulk sample of material in general accordance with ASTM: D-1557. The test result is shown in this appendix and presented as a curve where the soil dry density is compared to the moisture content. California Bearing Ratio Test A California Bearing Ratio (CBR) test was performed on a representative sample 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, 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 of 72 to 96 hours, during which time it was monitored for swell. At the end of this 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 as selected penetration depths. CBR test results and moisture -density relationships plotted in