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Recent investigations completed near the site location in Tracy indicate the presence of the San Joaquin fault located along the eastern front of the Diablo Range (Sowers and Ludwig, 1997). However, this fault is not presently designated as an earthquake fault zone by the California Division of Mines and Geology. The project site is not located within an Alquist-Priolo Earthquake Fault Zone. No Impact. Project activities will not affect the likelihood of an earthquake at the Site. o Strong seismic ground shaking No Impact. Due to the proximity of the project site to the San Joaquin fault there is the potential for some ground movement to occur(Sowers and Ludwig, 1997). The extent of ground movement will be a function of the magnitude and duration of any earthquake.However, it is not possible that the proposed project activities would cause or increase the likelihood of strong seismic ground shaking. • Seismic-related ground failure, including liquefaction No Impact. The Site has not been classified as part of an Alquist-Priolo Earthquake Fault Zone. The potential for ground failure, related to seismic-related ground failure due to project activities at the Site is insignificant, and the risk to life and property are negligible. • Landslides No Impact. There is very little potential for landslides to occur at the project location due to project activities (e.g. excavation of top two feet of soil). However, any mass movements that may occur will be contained within the current boundaries of the gravel pit. b. Result in substantial soil erosion or the loss of topsoil. No Impact. The Site currently exists as a grass covered gravel pit, there is minor potential for soil erosion or the loss of topsoil to occur during construction activities. However, any topsoil movement will be contained within the current boundaries of the gravel pit. 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. No Impact. The project site is located on unconsolidated alluvial fan deposits and fluvial gravels (Norris and Webb 1976)that would not be adversely affected as a result of project activities. Excavation activities on-site would likely not result in a higher probability of landslide. Excavation activities on site are not likely to generate an increased risk to public safety. In addition, these geologic units are not prone to landslide events. d. Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial risks to life or property. No Impact. The sedimentary deposits located at the project site are composed of silts and clays that would not be affected by project activities, nor would these activities create risk to life or property. No permanent structure exists at the site property. e. Have soils incapable of adequately supporting the use of septic tanks or alternative wastewater disposal systems where sewers are not available for the disposal of water. 28