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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY <br /> 12956 <br />DUDEK 55 April 2022 <br />geologic and soil stability hazards. Therefore, the project would have a less-than-significant impact <br />associated with an unstable geologic unit or soil. <br />d) Would the project be located on expansive soil, as defined in Table 18-1-B of the Uniform Building <br />Code (1994), creating substantial direct or indirect risks to life or property? <br />Expansive soils have a potential to undergo significant changes in volume in the form of either <br />shrinking or swelling due to changes in moisture content. Periodic shrinking and swelling of <br />expansive soils can cause extensive damage to buildings, other structures, and roads. Expansive <br />soils are potentially present at or near the surface in areas in northern Pleasanton and along the <br />northeastern portion of Pleasanton Ridge. As stated above, the project would not construct <br />structures and would be constructed consistent with the CBC, and local code. Therefore, the project <br />would have a less-than-significant impact associated with expansive soils. <br />e) Would the project have soils incapable of adequately supporting the use of septic tanks or <br />alternative waste water disposal systems where sewers are not available for the disposal of waste <br />water? <br />The project would not include restrooms and would not require the use of septic tanks or alternative <br />wastewater disposal systems. Therefore, the project would have no impact. <br />f) Would the project directly or indirectly destroy a unique paleontological resource or site or unique <br />geologic feature? <br />The project site contains no known paleontological resources or unique geologic features and is <br />not within an area considered sensitive for these resources. There is some potential to uncover <br />previously undiscovered paleontological resources during ground disturbing activities; however, <br />implementation of MM-GEO-2 would ensure that the potential impacts associated with effects to <br />unique paleontological or geological features would be less than significant. Therefore, impacts <br />would be less than significant with mitigation incorporated. <br />Mitigation Measures <br />MM-GEO-1 Erosion Control. Erosion control measures shall be implemented in accordance with an <br />erosion control plan. This could include measures for slope stabilization, dust control, and <br />temporary and permanent erosion control devices/best management practices such as <br />straw wattles, track out control devices, silt fencing, sediment traps, tarping of stockpiled <br />soils, revegetation treatments or other measures specified by the erosion and dust control <br />plan or as determined to be necessary by the project engineer. <br />MM-GEO-2 Treatment of Unanticipated Paleontological Resources. In the event that paleontological <br />resources (e.g., fossils) are exposed during construction activities for the project, all <br />construction work occurring within 50 feet of the find shall immediately stop until a <br />qualified paleontologist meeting the professional standards of the Society of Vertebrate <br />Paleontology can evaluate the significance of the find and determine whether or not <br />additional study is warranted. If the discovery is clearly not significant, the paleontologist