2312 W CASINO RD COMMUNITY TRANSIT Geotech Report 2022-10-25

APPENDIX A FIELD EXPLORATIONS AND LABORATORY TESTING Field Exploration Program Subsurface soil and groundwater conditions were evaluated by completing three current borings. The borings were drilled using a track-mounted drill rig owned and operated by Advance Drill Technologies, Inc. and subcontracted to GeoEngineers. The borings were completed to depths ranging from 21 to 31 feet below the existing ground surface.The approximate locations of the explorations are shown in the Site Plan presented in Figure 2. Disturbed soils samples were obtained using standard penetration test (SPT) methodology with the standard split-spoon sampler in the borings. The samples were placed in plastic bags to maintain the moisture content and transported back to our laboratory for analysis and testing. The explorations were continuously monitored by a geotechnical engineer from our firm who examined and classified the soils encountered, obtained representative soil samples, observed groundwater conditions, and completed detailed logs of the explorations. Soils encountered were classified visually in general accordance with ASTM International (ASTM) D 2488-09a the classification system described in Figure A-1. An explanation of our boring log symbols is also shown on Figure A-1. The logs of the explorations are included as Figures A-2 through A-4. The exploration logs are based on our interpretation of the field and laboratory data and indicate the various types of soils encountered. The logs also indicate the depths at which these soils or their characteristics change, although the change might actually be gradual. If the change occurred between samples in the borings, it was interpreted. Laboratory Testing Soil samples obtained from the explorations were transported to our laboratory and examined to confirm or modify field classifications, as well as to evaluate index properties of the soil samples. Representative samples were selected for laboratory testing consisting of the determination of the moisture content, and sieve analyses. The tests were performed in general accordance with test methods of ASTM or other applicable procedures. Moisture Content Testing Moisture content tests were completed in general accordance with ASTM D 2216 for representative samples obtained from the explorations. The results of these tests are presented on the exploration logs at the depths at which the samples were obtained. Sieve Analyses Sieve analyses were performed on selected samples in general accordance with ASTM D 422 to determine the sample grain size distribution.The wet sieve analysis method was used to determine the percentage of soil greater than the U.S. No. 200 mesh sieve.The results of the sieve analyses were plotted, classified in general accordance with the Unified Soil Classification System (USCS), and are presented in Figures A-5 and A-6. GEoENGINEER November 14,2019 Page A-1 File No.2095-019-07