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Appendix E - Geology and Soils Geotechnical Supporting Information COMBINED
City of Pleasanton
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ITEM 5 EXHIBIT A
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Appendix E - Geology and Soils Geotechnical Supporting Information COMBINED
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<br />LESTER-SHRINER PROPERTY <br />132-8-2 <br />Page A-1 <br /> <br />APPENDIX A: CURRENT FIELD INVESTIGATION <br /> <br />A more recent field investigation was performed on the Shriner Parcel and consisted of a <br />surface reconnaissance and a subsurface exploration program using track-mounted hollow- <br />stem auger drilling equipment and 4-wheel drive backhoe equipment. Two 8-inch-diameter <br />exploratory borings were drilled on October 7, 2014, to depths of approximately 25 to 31 feet. <br />Eight exploratory test pits were also performed on August 30, 2014, to depths ranging from <br />approximately 5 to 15 feet. The approximate locations of exploratory borings test pits are <br />shown on the Site Plan, Figure 2. The soils encountered were continuously logged in the field <br />by our representative and described in accordance with the Unified Soil Classification System <br />(ASTM D2488). Boring and test pit logs, as well as a key to the classification of the soil and <br />bedrock, are included as part of this appendix. <br /> <br />Exploration locations were approximated using existing site boundaries, a hand held GPS unit, <br />and other site features as references. Exploration elevations were based on interpolation of <br />plan contours. The locations and elevations of the borings and test pits should be considered <br />accurate only to the degree implied by the method used. <br /> <br />Representative soil samples were obtained from the borings at selected depths. All samples <br />were returned to our laboratory for evaluation and appropriate testing. Disturbed samples were <br />obtained with 2.5-inch I.D. dry core sampler that was hydraulically pushed out in advance of the <br />drill bit during auger drilling. The percent recovery of each 5-foot-long dry core interval is <br />recorded on the boring log at the appropriate sample depth. The standard penetration <br />resistance blow counts were obtained by dropping a 140-pound hammer through a 30-inch free <br />fall. The 2-inch O.D. split-spoon sampler was driven 18 inches and the number of blows was <br />recorded for each 6 inches of penetration (ASTM D1586). Unless otherwise indicated, the <br />blows per foot recorded on the boring log represent the accumulated number of blows required <br />to drive the last 12 inches. The various samplers are denoted at the appropriate depth on the <br />boring logs. <br /> <br />Attached boring and test pit logs and related information depict subsurface conditions at the <br />locations indicated. Subsurface conditions at other locations may differ from conditions <br />occurring at these exploration locations. The passage of time may result in altered subsurface <br />conditions due to environmental changes. In addition, any stratification lines on the logs <br />represent the approximate boundary between soil types and the transition may be gradual. <br /> <br />Ii! CORNERSTONE <br />EARTH GROUP
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