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DRAFT APPENDIX A SUBSURFACE EXPLORATIONS AND LABORATORY TESTING A.1 SUBSURFACE EXPLORATIONS A.1.1 General Subsurface materials and conditions at the site were evaluated between March 24 and July 8, 2021, with 11 borings, designated B-1 through B-11, and three cone penetration test (CPT) probes, designated P-1, P-5, and P-11. These explorations were advanced to depths of about 19 feet to 100 feet below existing site grades at the approximate locations shown on the Site Map, Figure 2. The subsurface-exploration work was coordinated and documented by a GRI representative, who maintained a log of the materials and conditions disclosed during the course of the work. A description of the subsurface explorations completed for this project is provided below. A.1.2 Drilled Borings The borings were advanced to depths of about 26.5 feet to 81.5 feet below the ground surface with mud-rotary and/or hollow-stem auger drilling techniques. The borings were completed using a CME 550 ATV-mounted drill rig provided and operated by Western States Soil Conservation, Inc., of Hubbard, Oregon. Disturbed and undisturbed soil samples were typically obtained from the borings at about 2.5-foot intervals of depth in the upper 10 feet to 15 feet and about 5-foot intervals below these depths. Disturbed soil samples were obtained using a standard split-spoon sampler or a California-modified split-spoon (CMS) sampler. The outside diameters of the standard split-spoon sampler and CMS sampler used are 2 inches and 3 inches, respectively. The CMS sampler was used primarily when sampling soils with larger particle sizes. During sampling, standard penetration tests (SPTs) were conducted by driving the sampler into the soil a distance of 18 inches using a 140-pound hammer dropped 30 inches. The number of blows required to drive the standard split-spoon sampler the last 12 inches is known as the Standard Penetration Resistance, or SPT N-value. The number of blows required to drive the CMS sampler the last 12 inches is denoted as the SPT N*-value. The SPT N- and N*-values provide a measure of the relative density of granular soils and the relative consistency of fine-grained soils. Samples obtained from the borings were placed in airtight jars and returned to our laboratory for further classification and testing. In addition, relatively undisturbed soil samples were obtained by pushing a 3-inch-outside-diameter Shelby tube into the undisturbed soil a maximum distance of 24 inches using the hydraulic ram of the drill rig. The soils exposed in the ends of the Shelby tubes were examined and classified in the field. After classification, the tubes were sealed with rubber caps and returned to our laboratory for further examination and testing. GRI #6497-A - 2.MO Indoor Football Practice Facility Page A-1 August 26, 2021