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AUGUSTIN BERNAL MOUNTAIN BIKE TRAIL PROJECT DRAFT INITIAL STUDY Less Than Significant Potentially Impact With Less Than Significant Mitigation Significant Impact Incorporated Impact No Impact c) Be located on a geologic unit or soil that is unstable,or that would become unstable as a result of the project,and potentially result in on-or off-site landslide, lateral spreading,subsidence, liquefaction or collapse? d) 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? e) 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? f) Directly or indirectly destroy a unique paleontological resource or site or ❑ ® ❑ ❑ unique geologic feature? Setting The project site is located within and adjacentto Augustin Bernal Community Park and under thejurisdiction of the City of Pleasanton. There are several active faults near the project area: Calaveras, Concord Green Valley, Green Valley, Greenville, Hayward, Mt. Diablo Thrust Fault, and San Andreas Faults. The Calaveras Fault, which is a designated Alquist Priolo fault zone, runs along the eastern edge of the Augustin Bernal Community Park, with the staging area and parking lot partially within the fault zone. The Hayward Fault, located approximately 8 miles west of the park, is also a designated Alquist Priolo fault zone.As described in the General Plan,the City of Pleasanton is considered to have a moderate seismic risk in terms of fault hazard,seismic ground shaking, and liquefaction.Additionally,the General Plan identifies that the project site is located within an area of substantial landslide susceptibility(City of Pleasanton 2005). Impact Discussion a) Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury,or death involving. i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. The California Geological Survey provides scientific information about the state's geology, seismology, and associated hazards. As part of their Seismic Hazards Program, areas 12956 DUDEK 52 April 2022