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Kittitas County,WA <br /> § 17A.06.040 KITTITAS COUNTY CODE § 17A.06.040 <br /> the approved alteration or development; <br /> g. The alteration or development will not increase surface water discharge or sedimentation to <br /> adjacent properties beyond predevelopment conditions; <br /> h. The proposed alterations will not adversely impact other critical areas; and <br /> i. Structures and improvements including drainage and vegetation management are designed to <br /> have no impact on the slope stability; and <br /> j. If development takes place within an identified geologically hazardous area, the development <br /> must be designed to fully mitigate the risk to the structure(s) and not increase the risk to the <br /> public, other properties or public infrastructure or resources. <br /> 2. Permitted alterations and development.The following alterations and development may be allowed in <br /> landslide hazard areas when all reasonable measures have been taken to minimize risks and other <br /> adverse effects associated with landslide hazards, and when the amount and degree of alteration is <br /> limited to the minimum needed to accomplish the alteration or development: <br /> a. Above-ground utility lines and pipes. Utility lines and pipes that are above-ground, properly <br /> anchored and/or designed so that they will not increase the risk or consequences of static or <br /> seismic slope instability or result in an increased risk of mass wasting. Such utility lines may be <br /> permitted only when the applicant demonstrates that no other feasible alternative is available to <br /> serve the affected population.For pipelines,automatic shut off valves should be located as close <br /> as practical to the landslide area so that the release from the pipe upon breakage is minimized. <br /> b. Access roads and trails. Access roads and trails that are engineered and built to standards that <br /> avoid the need for major repair or reconstruction beyond that which would be required in non- <br /> hazard areas. Access roads and trails may be permitted only if the applicant demonstrates that <br /> no other feasible alternative route exists. Standards to minimize impacts may be specified by the <br /> Director. <br /> C. Stormwater conveyance. Stormwater conveyance through a properly designed stormwater pipe <br /> when no other stormwater conveyance alternative is available. The pipe shall be located above- <br /> ground and be properly anchored and/or designed so that it will continue to function in the event <br /> of a slope failure or movement of the underlying materials and will not increase the risk or <br /> consequences of static or seismic slope instability or result in increased risk of mass wasting <br /> activity. <br /> 3. Setbacks. The Director shall require setbacks from the edges of any landslide hazard area in <br /> accordance with the following: <br /> a. The size of the setbacks shall be based on the findings of a qualified engineering geologist or <br /> geologist, licensed in the state of Washington, and shall protect critical areas and minimize the <br /> risk of property damage,death,or injury resulting from landslides caused in whole or part by the <br /> alteration or development and shall be sized to provide protection for a period of at least 100 years <br /> based on the assessment of the geologic processes within the landslide hazard area; <br /> b. The setback above the landslide hazard area shall include consideration of hydrologic <br /> contribution to the landslide area and/or the area subject to the potential for mass movement,and <br /> the setback down slope from the landslide hazard area shall include consideration of landslide <br /> run out; and <br /> Downloaded from https:Hecode360.com/KI6857 on 2025-05-15 <br />