1707 SCENIC DR SNO CO PUD Geotech Report 2022-10-25

APPENDIX A FIELD EXPLORATIONS SubsurFace conditions were explored at the site by drilling nine borings (B-1 through B-9) and excavating seventeen test pits (TP-1 to TP-17). Borings B-1 through B-5 were completed on April 8, 2009 to depths ranging from 18 feet to 281/2 feet below the existing ground surFace. Borings B-6 through B-9 where completed on March 3, 2014 to depths ranging from 8 feet to 201/2 feet below the existing ground surFace. Test pits TP-1 through TP-11 were completed on April 2, 2009 to depths ranging from 8 to 14 feet below the existing ground surface and TP-12 to TP-17 were compieted on April 24 and 25, 2014 to depths ranging from 4 to 8 feet. The locations of the explorations were estimated using a hand-held GPS device with sub-meter accuracy and by measuring distances from site features in the field by taping/pacing and should be considered approximate. The approximate locations of the explorations are shown on the Site Plan, Figure 2. Ground surface elevations shown on the exploration logs were estimated based on the base survey map shown on Figure 2. Borings The borings were completed using trailer-mounted, continuous-flight, hollow-stem auger drilling equipment, owned and operated by Geologic Drill Explorations, Inc. of Spokane, Washington. The borings 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 prepared a detailed log of each boring. The soils encountered in the borings were sampled at 21h to 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 automatic 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 preclude 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 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 are presented in Figures A-2 through A-10. The boring logs are based on our interpretation of the field and �aboratory 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 change occurred between samples, it was interpreted. The densities noted on the boring logs are based on the blow count data obtained in the borings and judgment based on the conditions encountered. Observations of groundwater conditions were made during drilling. Groundwater conditions observed during drilling represent a short term condition and may or may not be representative of the long term groundwater conditions at the site. � GEOENGINEER� October24,2014 PageA-1 File No.0482-027-02