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<br /> <br />55 <br /> <br />areas and avoid the need for channel dredging or diking or other maintenance <br />activities that have the potential to substantially degrade river and stream functions. <br />b. Residential and Commercial Developments. Permanent residential structures and <br />commercial developments shall be allowed in alluvial fan hazard areas only if the <br />alluvial fan has undergone a County-approved study to assess potential hazards, <br />determine risks, and identify mitigation measures and is deemed suitable for <br />development. The Director shall make this determination based on a detailed <br />assessment by a qualified engineer, engineering geologist, or geologist, licensed in <br />the state of Washington, that identifies the risks associated with a 500-year return <br />period debris flow or the maximum credible event that could impact the alluvial fan. <br />c. Accessory Structures. Accessory structures not involving human occupancy shall <br />be allowed. <br />17A.06.070 Seismic Hazard Standards <br />1. Permitted Alterations and Development. Alterations and development within seismic <br />hazard areas shall follow the provisions of the Kittitas County-adopted version of the Uniform <br />Building Code. Alterations and development within seismic hazard areas shall not require the <br />submission of a geologically hazardous area risk assessment or geotechnical report. <br /> <br />17A.06.080 Volcanic Hazard Areas <br />1. Permitted Alterations and Development. Because volcanic hazards in Kittitas County are <br />limited to ash deposition, alterations and development located only within volcanic hazard <br />areas, and not other geologically hazardous areas, shall not require the submission of a <br />geologically hazardous area risk assessment or geotechnical report. <br /> <br />17A.06.090 Mine Hazard Areas <br />1. Alteration. There are no additional protection standards for mine hazard areas; the <br />standards of KCC 17A.06.030 shall apply. <br /> <br />17A.06.100 Reporting <br />1. Geologically Hazardous Area Risk Assessment . If a proposed development is located <br />within or adjacent to a known or suspected landslide, mine, alluvial fan, or erosion hazard <br />area, the applicant shall submit a Geologically Hazardous Area Risk Assessment prepared <br />by a qualified professional geologist or engineering geologist. No further analysis shall be <br />required if the Geologically Hazardous Area Risk Assessment concludes that the alteration <br />or development is not at risk from potential geologic hazards, and that there is no geologic <br />hazard present on or adjacent to the site. <br /> <br />If the Geologically Hazardous Area Risk Assessment and/or the Director concludes that a <br />geologically hazardous area is located on or adjacent to the alteration or development and/or <br />the alteration or development is at risk from potential geologic hazards, the applicant shall <br />submit a Geotechnical Report consistent with the provisions of KCC 17A.02.370, <br />andprepared by a qualified engineer or engineering geologist. <br />2. Geologically Hazardous Area Risk Assessment Contents. When required by this <br />Chapter, Geologically Hazardous Area Risk Assessments shall include the general critical <br />areas report requirements of KCC 17A.01.080 in addition to the following: <br />a. A description of the geology of the site and the proposed development; <br />b. An assessment of the potential impact the project may have on the geologic hazard; <br />c. An assessment of what potential impact the geologic hazard may have on the <br />project; <br />d. Appropriate mitigation measures, if any; <br />e. A conclusion as to whether further analysis is necessary; and <br />f. The signature and stamp of the engineering geologist, or geologist that prepared the <br />assessment.