DRAFT <br />(CPT) probes, designated P-1, P-5, and P-11. The CPT probes were advanced through <br />previously backfilled borings to obtain specific information for seismic evaluations and are <br />not discussed in significant detail below. The explorations were advanced to depths of <br />about 19 feet to 100 feet below existing site grades at the approximate locations shown <br />on the Site Map, Figure 2. Logs of the explorations are provided on Figures 1A through <br />14A. The terms and symbols used to describe the materials encountered in the <br />explorations are defined in Tables 1A through 2A and the attached legend. Additional <br />information regarding the subsurface-exploration and laboratory-testing programs <br />completed for this investigation is provided in Appendix A. <br />As part of our investigation, we also reviewed available subsurface information for the <br />immediate project area, including the results of three drilled borings completed between <br />1996 and 2010. These borings were advanced to depths of about 30 feet to 150 feet below <br />previous site grades at the approximate locations shown on Figure 2. Logs of the <br />explorations are attached in Appendix A for reference and disclosed similar subsurface <br />conditions to those encountered during this investigation. <br />4.2 Soils <br />The explorations completed for this investigation generally encountered a layer of field <br />surfacing material that typically extends to depths of about 2 feet to 3 feet below the <br />ground surface. The surfacing materials consists of natural or synthetic field turf underlain <br />by sand and pea gravel or open-graded crushed rock used for drainage purposes. Variable <br />fill ranging from silt to sand was encountered beneath the field surfacing in some of the <br />explorations and extends to a maximum depth of about 8 feet. These surficial materials <br />are underlain by alluvium and possible fill consisting of gravel and cobbles that extend to <br />depths of about 16 feet to 24 feet. The gravel and cobbles are underlain by sand, and <br />gravel, silt, and clay soils derived from the weathering and decomposition of volcanic <br />mudstone, which in turn are underlain by predominantly silt and clay soils derived from <br />the weathering and decomposition of sedimentary rock. The materials encountered in the <br />explorations completed for this investigation are similar to those encountered during our <br />geotechnical investigations for other nearby projects. For the purpose of discussion, the <br />materials disclosed by the explorations have been grouped into the following units based <br />on their physical characteristics and engineering properties: <br />a. FIELD SURFACING <br />b. FILL <br />c. GRAVEL and COBBLES (Alluvium/Possible Fill) <br />d. SAND, GRAVEL, SILT, and CLAY (Decomposed Volcanic Mudstone) <br />e. SAND, SILT, and CLAY (Decomposed Sandstone/Siltstone) <br />GRI #6497-A - 2.MO Indoor Football Practice Facility Page 3 <br />August 26, 2021 <br />