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n INITIAL STUDY/ENVIRONMENTAL DOCUMENTATION LSAASSOCIATES,INC- STOCKTON METROPOLrrAN AIRPORT JULY 2000 SPECIAL PURPOSE PLAN Seismic-related ground failure,including liquefaction? No impact. Seismic-related ground failure and liquefaction are not expected. E All construction will be performed in compliance with state building code regulations and should mitigate seismic-related impacts. iv) Landslides? No impact. The airport site is generally flat and not susceptible to unstable i soil conditions. The proposed project will not expose people to risks of landslides or mudflows. b) Result in substantial soil erosion or the loss of topsoil? I i Less than significant impact. BMPs shall be used that prevent soil erosion, drainage channel scour, etc., during construction as previously addressed in the Airport Master Plan EIR. Project implementation will increase the area of paved surfaces thus decreasing long-term erosion of top soils, 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. There is no known evidence of land subsidence in the project area. See also (a)above.. 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? Potentially significant unless mitigated. Similar to most of the greater Stockton area, the project soils are subject to"high" shrink-swell behavior. When buildings are placed on expansive soils, foundations rise during wet periods and fall during dry periods. Different parts of a building may rise and fall at varying rates causing foundation damage and cracking. Hazards of expansive soils may be avoided through proper drainage and foundation design. As a result,all structures proposed in the project area must include corrective measures to accommodate expansive soil potential Mitigation Measure S-1 In conjunction with site development and prior to issuance of building permits, specific project area developers or applicants must submit soils reports prepared by a qualified engineering geologist,or equivalent professional to the County Building Inspection Division for approval. The report must specify the soil conditions and character,and indicate how proposed structures and foundations will be designed to accommodate expansive soil constraints. 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? 7120100(P:1SJC0301Envirenmentallinitial study.wpd) t 34