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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.6 GEOLOGY AND SOILS Less Than Potential SPIIIEIR Significant Significant Requires Impact Due New New Impact Additional to Mitigation Additional Additional Less Than Adequately Review:No Measures in Impact Not Mitigation Significant Addressed in Significant Project Addressed in Measures Issue or No Impact SPIIIEIR Impact Description SPIIIEIR Required 6. GEOLOGY AND SOILS. Would the project: ba a) Expose people or structures to potential substantial adverse effects, including the risk of loss,injury,or death involving: Va. i) Rupture of a known earthquake ■ 11 L1 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 I substantial evidence of a aw known fault? Refer to Division of Mines and Geology Special Publication 42. ii) Strong seismic groundbw ■ shaking? iii) Seismic-related ground failure, ■ L1 ❑ including liquefaction? iv) Landslides? ■ ❑ ❑ v b) Result in substantial soil erosion or ■ ❑ ❑ ❑ 11 ❑ the loss of topsoil? r 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 risks to life or propertyo fr e) Have soils incapable of adequately ■ supporting the use of septic tanks or alternative wastewater disposal �. systems where sewers we not available for the disposal of wastewater? 4 4-27