7800 EVERGREEN WAY HYUNDAI Drainage Report 2025-04-28

APPENDIX A FIELD EXPLORATIONS Subsurface soil and groundwater conditions for the building addition project were evaluated by drilling three borings (B-1 through B-3) on August 16, 2021. The borings were completed to depths ranging from 12 to 21 feet. The boring locations were determined by measuring from existing site features and using a hand-held GPS unit. Elevations were estimated from existing site survey prepared by Axis Survey and Mapping on July 27, 2021. The approximate boring locations are shown in Figure 2. The borings were completed by Holocene Drilling, Inc.using a track-mounted,continuous-flight,hollow-stem auger Diedrich D-50 drill rig. The borings were continuously monitored by a representative from our firm who reviewed and classified the soils encountered, obtained representative soil samples, observed groundwater conditions and prepared a detailed log of each exploratier. The soils encountered in the borings were generall sar;iipled at 21/2- and foot vertical intervals with a 2-inch outside-diameter split-barrel standard penoi ,,lion test(SPT) sampler. rim disturbed samples were obtained by driving the sampler 18 inches into the with a 140-pound auto111:11ic hammer free-falling 30 inches. The number of blows required for each 6 inches of pencriation was recorded. The blow count ("N-value")of the soil was calculated as the number of blow:, i, vod for the final 12 inch 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 re:nluded driving the full 18 inches, the penetration resistance for the partial penetration was entered on the i,)ds. The blow counts are shown on the boring logs at the respr ; ivr sample depths. Soils encountered in 1 0 borings were visually classified in gener ;! accordance with the classification system described in Figure ,\-1, Key to 1--coloration Logs. A key to the boring log symbols is also presented in Figure A-1. The logs of the borings or.:-:- presented in Figures A-2 through A-4. The boring logs are based on our interpretation of the field Ind i nI oratory data and indicate the various types of soils and groundwater conditions encountered. f he logs ,o!sn indicate t'h depths at which these soils or their characteristics change, ;!'hough the chap '; may acti r:Illy be gradual. If the change occurred between samples, it was interpreted Hie densities note,l on the bar ii.logs are based on the blow count data obtained in the borings and judgment l,,rsed on the conditions encou,,i gyred. Observations of g, )i_indwater conditions were made during drilling. The groundwater conditions encountered during di i!!irll are pl-:-tinted on the boring logs. Groundwater conditions observed during drilling represent a short-ten i ref r-i lion and may or may not be representative of the long-term groundwater conditions at the site. Ground. IL r conditions observed during drilling should be considered approximate. GEoENGINEERSZ December 6,2021 Page A-1 File No.24459-003-00