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KLE/NFELOER <br /> �Bright People.Right Solutions. <br /> 2 FIELD EXPLORATION AND LABORATORY TESTING <br /> 2.1 FIELD EXPLORATION <br /> 2.1.1 Pre-Field Activities <br /> Prior to subsurface exploration, Kleinfelder filed an application for a drilling permit with San <br /> Joaquin County Environmental Health Department (EHD), marked exploration locations in the <br /> field, and Underground Service Alert(USA)was contacted to provide utility clearance in the public <br /> right-of-way. In addition, a private utility locator was employed to clear the drill sites of private <br /> utilities and other buried obstructions. We also prepared a site-specific health and safety plan for <br /> the field exploration activities. This plan was discussed with the field crews prior to the start of <br /> field exploration work. <br /> 2.1.2 Subsurface Explorations <br /> To evaluate the subsurface conditions at the site for the proposed improvements, nine (9) borings <br /> (13-1 through B-9) were drilled on April 16 and 17, 2020. Five (5) borings were drilled to depths <br /> ranging from approximately 211/2 to 31 1/2feet below the existing ground surface within the footprint <br /> of the proposed structure. In addition, four (4) borings were drilled to depths ranging from about <br /> 61/2 to 111/2 feet for assessment of the subsurface conditions within the areas of the proposed <br /> asphalt and concrete pavements. Two (2) additional borings were drilled to depths of about 3 to <br /> 5 feet within the area of the bioretention basin for percolation testing. The borings were advanced <br /> by V&W Drilling of Lodi, California using a CME 55-HT truck mounted drill rig equipped with an <br /> approximate 6-inch diameter hollow-stem auger (HAS) drilling system. The approximate <br /> exploration locations are shown on Figures 2 and 3. Explorations were located in the field by <br /> measuring and/or pacing from existing landmarks. Horizontal coordinates of the borings were not <br /> surveyed but were approximated from Google Earth. <br /> A Kleinfelder professional maintained logs of the borings, visually classified the soils encountered <br /> according to the Unified Soil Classification System (presented on Figure A-1 in Appendix A) and <br /> obtained samples of the subsurface materials. Soil classifications made in the field from samples <br /> were in accordance with American Society for Testing and Materials (ASTM) Method D2488. <br /> These classifications were re-evaluated in the laboratory after further examination and testing in <br /> 20210067.001A/ST020R111447 Page 3 of 37 May 11, 2020 <br /> ©2020 Kleinfelder www.kleinfelder.com <br />