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2014 -2021 SANTA ANA HOUSING ELEMENT AND PUBLIC SAFETY ELEMENT UPDATES CITY OF SANTA ANA 3. Environmental Analysis 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? Less Than Significant Impact. Soils within the Orange County portion of the Coastal Basin are characterized by medium - grained sandy sediment. Soil survey implementation from the U.S. Department of Agriculture, Web Soil Survey, shows that there are a wide variety of soils in the City, including those from the Bolsa Series, the Chino Series, the Hueneme Series, and the Metz Series. Soils within the City are characterized by deep alluvial deposits (USDA 2013). Alluvium is composed of stiff to very stiff, medium dense to very dense, light brown, dark brown, light gray and moist to saturated sandy clay, silty sand, sand, and gravelly sand. These materials are primarily fine grained and exhibit slight to moderate plastic and expansive properties. The soils are typically loose in their native state, with varying reported relative compactions ranging between approximately 55 to 75 percent. Any future development that occurs under the Housing Element would be subject to CEQA review, consideration of potential soil- related impacts, and any necessary improvements to ensure long -term geotechnical stability. Furthermore, all new development is required to comply with CBC standards that include details to construction design and earthwork and foundation preparations to ensure soil and site stability. Therefore, adherence to CBC standards on a project -by- project basis would ensure maximum protection against unstable soils and geologic units and impacts would be less than significant. 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? Less Than Significant Impact. See response to Section 3.6(c). Expansive soils shrink or swell as the moisture content decreases or increases. Structures built on these soils may experience shifting, cracking, and breaking as soils shrink and subside or expand. Any future development that occurs under the Housing Element would be subject to future CEQA review and CBC standards. Necessary improvements to ensure long -term geotechnical stability would also be required. Thus, impacts related to soil due to the adoption of the Housing Element would be less than significant. 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? No Impact. Future developments that occur in conjunction with the proposed project would utilize the local sewer system. Therefore, no significant impacts would result from septic tanks or other on -site wastewater disposal systems. 3.7 GREENHOUSE GAS EMISSIONS Scientists have concluded that human activities are contributing to global climate change by adding large amounts of heat - trapping gases, known as greenhouse gases (GHG) emissions, into the atmosphere. The primary source of these GHG emissions is fossil fuel use. The Intergovernmental Panel on Climate Change (IPCC) has identified four major GHG emissions —water vapor, carbon dioxide (CO2), methane (CH4), and Page 50 • The Planning Center i DC&E, 75A -72 December 2013