11831 AIRPORT RD WHOLE SITE FILE Geotech Report 2022-10-25

APPENDIX A FIELD EXPLORATIONS Subsurface conditions were explored at the site by drilling twenty-two borings and completing six hand auger holes.The borings were completed to depths ranging from about 2%to 161/2 feet below the existing ground surface (bgs). Borings GEI-1 through GEI-24 (omitting GEI-2 and GEI-7) were performed by Geologic Drill, Inc.under subcontract to GeoEngineers on August 25, August 26, October 17, October 18, October 19, November 15, and November 16, 2016. Borings MW-1 through MW-3 were completed to a depth of 211/2 feet on March 9 and 10th, 2017.Test pits PIT-1 and PIT-2 were completed on March 24 and 27, 2017. The locations of the explorations were estimated by taping/pacing in the field from existing site features. The approximate locations of the explorations are shown on the Site Plans, Figures 2A though 2R. Borings and Hand Augers Borings were completed using track-mounted or trailer-mounted, continuous-flight, hollow-stem auger drilling equipment. The borings were continuously monitored by a representative from our firm who examined and classified the soils encountered, obtained representative soil samples, observed groundwater conditions and prepared a detailed log of each exploration. Hand augers were completed by a representative from our firm using a manual hand auger to excavate a 31/2-inch-diameter hole. Samples were taken at 2-foot vertical intervals or wherever a soil change was observed during auguring. The test pits were completed using a small tracked excavator. The test pits were continuously monitored by a representative from our firm who visually examined and classified the soils encountered, obtained representative soil samples, observed surface and groundwater conditions and prepared a detailed log of each test pit. The soils encountered in the borings were sampled at 21/2- or 5-foot vertical intervals with a 2-inch outside-diameter split-barrel standard penetration test (SPT) sampler. The samples were obtained by driving the sampler 18 inches into the soil with a 140-pound hammer free-falling 30 inches. The number of blows required for each 6 inches of penetration was recorded.The blow count("N-value")of the soil was calculated as the number of blows required for the final 12 inches of penetration. This resistance, or N-value, provides a measure of the relative density of granular soils and the relative consistency of cohesive soils.Where very dense soil conditions precluded driving the full 18 inches,the penetration resistance for the partial penetration was entered on the logs. The blow counts are shown on the boring logs at the respective sample depths. Soils encountered in the borings, hand augers,and test pits were visually classified in general accordance with the classification system described in Figure A-1.A key to the boring log symbols is also presented in Figure A-1. The logs of the borings, hand augers, and test pits are presented in Figures A-2 to A-34. The boring and hand auger logs are based on our interpretation of the field and laboratory data, and indicate the various types of soils and groundwater conditions encountered. The logs also indicate the depths at which these soils or their characteristics change, although the change may actually be gradual. If the GEOENGINEERSII April 14,2017 PageA-1 File No.2095-032-00