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