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Mater Dei High School October 20, 2023 <br />Proposed Dance Studio, Santa Ana, California Project No. 3204.I <br />3204-I-01X (10/23) A-1 <br />APPENDIX A <br />EXPLORATORY BORINGS <br />The subsurface conditions at the site were investigated by drilling and sampling two <br />exploratory borings. The borings were advanced to depths of 20 and 50½ feet below the <br />existing ground surface. The locations of the explorations are shown on the Site Plan, <br />Figure 3. <br />The exploratory borings were drilled using truck-mounted hollow-stem auger drill <br />equipment. Disturbed samples were obtained using a split-spoon sampler by means of the <br />Standard Penetration Test (SPT, ASTM D 6066). The spoon sampler was driven into the soil <br />by a 140-pound hammer dropping 30 inches, employing the “free-fall” hammer described <br />above. After an initial seating drive of 6 inches, the number of blows needed to drive the <br />sampler into the soil a depth of 12 inches was recorded as the penetration resistance. These <br />values are the raw uncorrected blow counts. <br />At selected locations, relatively undisturbed samples were obtained using a brass-ring lined <br />sampler (ASTM D 3550). The brass-rings have an inside diameter of 2.42 inches. The ring <br />samples were driven into the soil by a 140-pound hammer dropping 30 inches. The <br />number of blows needed to drive the sampler into the soil was recorded as the penetration <br />resistance. <br />The field explorations for the investigation were performed under the continuous technical <br />supervision of GPI's representative, who visually inspected the site, maintained detailed <br />logs of the borings, classified the soils encountered, and obtained relatively undisturbed <br />samples for examination and laboratory testing. The soils encountered in the borings were <br />classified in the field and through further examination in the laboratory in accordance with <br />the Unified Soils Classification System. Detailed logs of the borings are presented in <br />Figures A-1 and A-2 in this appendix. <br />The boring locations were laid out in the field by measuring from existing site features. <br />Ground surface elevations at the exploration locations were estimated from Google Earth. <br />1202 W Edinger <br />Ave10/3/2024