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POTENTIALLY POTENTIALLY SIGNIFICANT LESS TITAN ISSUES SIGNIFICANT L`NLESS SIGNIFICANT IMPACT SOURCES ISSUES MITIGATION IMPACT INCORPORATED 3. GEOLOGY AND SOILS, continued d. Be located on expansive soil, creating substantial X 1,2 risks of life or pro erty? e. Have soils capable of adequately supporting the use X 1,2 of septic tanks or alternative waste water disposal systems where sewers are not available for the dis osal of waste water? f. Any increase in wind or water erosion of soils, either X 1 on- or off-site? g. Changes in deposition or erosion of beach, sands, or X 1,2 changes in siltation, deposition or erosion which may modify the channel of a river or stream or the bed of the ocean or an ba ,inlet or lake? EXPLANATION: a) The Housing Element does not promote any actions that would directly result in development of a specific site or construction of a particular project. However, San Leandro is in a seismically active region, and any development in the city would be vulnerable to seismic hazards. The greatest hazard in the city is ground shaking, which would be very strong to violent in the event of a major earthquake on the San Andreas or Hayward Faults. Only two of the city's available housing sites are located within the Alquist Priolo Special Studies Zone. These sites have the capacity for just three single family units and represent only one-tenth of one percent of the City's development potential. Liquefaction hazards are most pronounced in the industrial areas west of I-880 and in the Washington Manor, Heron Bay, Marina Vista, and Marina Faire neighborhoods on the city's west side. There are only six housing sites in these areas, with a capacity of 19 units. This represents less than one percent of the City's housing capacity. Only four of the sites in the housing inventory-each with the capacity for only one or two single family homes each-are located in the San Leandro Hills where landslide hazards are present. Impacts associated with seismic hazards were evaluated in the General Plan EIR and in the TOD Strategy EIR. Mitigation measures were identified in both EIRs to reduce hazards to life and property. In the case of the General Plan, these measures include policies and actions that that will be applied to all future development projects. In addition, City engineering standards require that development in geologically hazardous areas are subject to geotechnical studies, with specific measures taken to reduce potential hazards. All construction also must comply with building code safety regulations. Conformance with the building code and adherence to policies in the General Plan would minimize seismic shaking impacts. b) Adopting the Housing Element would not by itself result in substantial soil erosion or the loss of soil. Erosion potential was mapped as part of the General Plan Update. Policy 29.01 of the Plan recommends that the City's engineering and building standards minimize the potential for natural hazards, including shrink swell and erosion hazards. The Plan and its EIR note that erosion control measures would be required for development along San Leandro Creek and in the Hill neighborhoods. Site-specific conditions of approval will continue to be applied on aproject-by-project basis. No new or increased impact will result above what was already anticipated by the General Plan EIR and TOD Strategy EIR. c) The Housing Element does not propose projects on geologic units that are unstable or that would potentially result in landslides, lateral spreading, subsidence, liquefaction, or collapse. Most of the housing sites are on flat, stable land where these hazards are not present. The General Plan EIR analyzed land stability and assigned land use map designations to reduce the potential for hazards. Its policies and actions measures aim to minimize exposure to impacts. No new or increased impacts will result above those already anticipated and analyzed in the General Plan and TOD Strategy EIRs. d) The shrink-swell characteristics of San Leandro's soils were mapped as part of the General Plan Update. Policies in the Plan seek to mitigate the potential for impacts associated with future development projects. The Housing Element proposes no changes that would result in new or increased impacts. Future development will be required to complete soil studies, and implement engineering improvements and other measures to mitigate for soil expansion potential. Housing Element Initial Study and Negative Declaration 10 February 2010