1010 N BROADWAY EVCC 2018-01-01 MF Import

PROPOSED LIBERTY HALL,EVERETT COMMUNITY COLLEGE Everett,Washington APPENDIX A FIELD EXPLORATIONS Subsurface conditions were explored at the site by drilling seven borings, designated B-1 through B-7. The boring locations are shown on the Site Plan, Figure 2. The borings were completed to depths of 24 to 311/2feet below the existing ground surface and the drilling was completed by Geologic Drill on April 26, 2010. The locations and elevations of the explorations were estimated in the field by taping from existing site features. 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-8. The boring 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 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. Observations of groundwater conditions were made during drilling and are presented on the boring logs. 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. Groundwater conditions observed during drilling should be considered approximate. Borings were completed using truck-mounted, continuous-flight, hollow-stem auger drilling equipment. 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 21/2-or 5-foot vertical intervals with a 2-inch outside diameter split-barrel standard penetration test(SPT) sampler with a standard 140-pound rope and cathead hammer in accordance with American Society for Testing and Materials (ASTM) D 1586. 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. The N-value (blows/foot) shown on the boring logs have not been corrected for hammer efficiency. Where very dense soil conditions or large particles 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. GEOENGINEERS June 10,2010 t Page A-1 File No.5836-010-00