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Environmental Checklist Geology and Soils Draft Initial Study – Mitigated Negative Declaration 65 a.4. Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving landslides? Earthquakes can trigger landslides that may cause injuries and damage many types of structures. Landslides are typically a hazard on or near slopes or hillside areas, rather than on generally level areas, like the project site. The project site is not within an area mapped as having landslides (CGS 2019). Therefore, the project has a low potential for slope instability occurring at the site and impacts would be less than significant. LESS-THAN-SIGNIFICANT IMPACT b. Would the project result in substantial soil erosion or the loss of topsoil? Project construction, particularly grading and site preparation, could result in erosion and loss of topsoil from the project site. The project developer would be required to follow applicable CBC and SLMC requirements to reduce soil erosion, including SLMC Section 7-12-230, which requires erosion and sedimentation control measures and drainage plans to be prepared by a civil engineer and submitted to the City for approval prior to issuance of a grading permit. Where appropriate, the control measures must include measures including, but not limited to, short-term erosion control planting, waterproof slope covers, stormwater retention basins, and devices to trap, store, and filter sediment during project construction and operation. Compliance with federal, State, and City regulations would reduce impacts related to soil erosion and the loss of topsoil to less than significant levels. LESS-THAN-SIGNIFICANT IMPACT d. Would the project be located on expansive soil, as defined in Table 1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? Expansive soils are those that have a potential to undergo significant changes in volume, either shrinking or swelling, due to their composition and moisture content. Periodic shrinking and swelling of expansive soils can cause extensive damage to other structures and roads. According to the NRCS, soil within and around the project site consists of Clear Lake clay. Clear Lake clay is very deep, poorly drained soil formed from mixed rock resources, and are not known to be expansive (NRCS 2018a; 2018b). Therefore, the project would not be located on expansive soil, and impacts would be less than significant. LESS-THAN-SIGNIFICANT IMPACT e. Would the project 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 wastewater? The project site would be served by the municipal sewer system and would not require the installation of an on-site septic tank or alternate wastewater treatment systems. Therefore, no impacts from septic systems or alternative wastewater disposal systems would occur. NO IMPACT