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<br /> <br />51 <br /> <br />hundred-year channel migration hazard area shall be of a scale and format <br />specified by the department. <br />d. Seismic Hazard Areas. Seismic hazard areas shall include areas subject to severe <br />risk of damage as a result of earthquake induced ground shaking, slope failure, <br />settlement, soil liquefaction, lateral spreading, or surface faulting. <br />e. Volcanic Hazard Areas. Volcanic hazard areas shall include areas subject to <br />pyroclastic flows, lava flows, debris avalanche, inundation by debris flows, mudflows, <br />or related flooding resulting from volcanic activity. There are no active or dormant <br />volcanoes located within Kittitas County; however, Mount Rainer and Mount St. <br />Helens are relatively near. Hazards to Kittitas County residents from these volcanoes <br />are likely limited to ash deposition. <br />f. Mine Hazard Areas. Mine hazard areas shall include areas underlain by abandoned <br />mine shafts, secondary passages between shaft tunnels, or air vents. Mine hazards <br />include subsidence, which is the uneven downward movement of the ground surface <br />caused by underground workings caving in; contamination to ground and surface <br />water from tailings and underground workings; concentrations of lethal or noxious <br />gases; and underground fires. <br />3. Mapping. The approximate location and extent of geologically hazardous areas are shown <br />on maps maintained by the County. These maps are useful as a guide for project applicants <br />and/or property owners but do not provide a conclusive or definitive indication of geologically <br />hazardous area presence or extent. Other geologically hazardous areas may exist that do <br />not appear on the maps, and some geologically hazardous areas that appear on the maps <br />may not meet the geologically hazardous areas designation criteria. The County shall update <br />the maps periodically as new information becomes available and may require additional <br />studies during the development review process to supplement and/or confirm the mapping. <br />Historic maps showing the locations of known coal mines within the County are available <br />from the Washington Department of Natural Resources. <br /> <br />17A.06.030 General Protection Standards <br />1. Generally. New developments shall be located and/or engineered and constructed to <br />minimize risk to health and safety, protect the building and occupants from the hazard, and <br />not increase the risk of landslides or erosion that could impact either other properties, public <br />resources, or other critical areas such as wetlands and fish and wildlife habitat conservation <br />areas. If impacts to other properties, public resources or other critical areas cannot be <br />avoided these impacts should be mitigated for. The Director may impose conditions on <br />alterations and development in a geologically hazardous area as needed to: <br />a. Protect slope stability and minimize erosion, seismic, and/or landslide hazard risks; <br />b. Maintain natural sediment and erosion processes that are integral to the health and <br />sustainability of freshwater ecosystems as well as minimizing impacts to stream and <br />river processes such as channel infill, channel migration or flooding; <br />c. Minimize the potential for property damage related to seismic events, erosion and/or <br />landslides; <br />d. Minimize the need for stream or river bank stabilization in the future; <br />e. Protect human health and safety; and <br />f. Reduce public liabilities for damages associated with seismic events, erosion and/or <br />landslides <br />2. Impact Avoidance. Impact avoidance measures shall include, but not be limited to, locating <br />the use/development outside of the hazard area, reducing the number, size or scale of <br />buildings, driveways and other features; altering the configuration or layout of the proposed <br />development; using environmentally favorable construction materials; implementing special <br />engineering methods for construction, drainage, runoff management etc.; foregoing <br />construction of accessory structures; preserving native vegetation; and other reasonable <br />measures.