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35 <br /> <br />2) Setbacks. Applicants proposing subdivisions adjacent to blue line perennial watercourses, as <br />identified on the most recent version of a 1:100,000 or 1:24,000 USGS quadrangle, shall <br />delineate building control lines on the recorded plat limiting certain activities and land uses in <br />these designated areas. <br />3) Building Control Lines. Except when using the Alternate Method of establishing the Minimal <br />Disturbance Zone Setback of this Ordinance, all subdivisions shall provide the following <br />building control lines, measured horizontally and perpendicular from the centerline of the <br />watercourse towards the proposed development, regulating the use and activities within <br />these building control lines in accordance with Minimal and Limited Disturbance Zone <br />Requirements of this Ordinance: <br />a) Minimal Disturbance Zone Setback: three hundred and fifty (350) feet for the Red and <br />Wild Rice rivers. All other blue line perennial watercourses Minimal Disturbance Zone <br />Setback may be based on the three hundred and fifty (350) foot setback or be equal to <br />vertical difference between the top of bank and the river bottom (plus any additional flood <br />plain elevation requirements) multiplied by eight (8). <br />b) Limited Disturbance Zone Setback: beginning at the outer edge of the Minimal <br />Disturbance Zone Setback and extending one hundred (100) feet. <br />4) Alternate Method of establishing Minimal Disturbance Zone Setbacks. As an alternative to <br />using the established Minimal Disturbance Zone Setback along the blue line perennial <br />watercourses, an applicant may request to use a site specific Minimal Disturbance Zone <br />Setback, determined as a result of a detailed geotechnical investigation. The investigation <br />must be performed by a registered professional engineer and testing firm acceptable to the <br />County Engineer. Sufficient number of soil borings must be performed and at appropriate <br />locations to provide a representative sampling of the site. The soils report and determination <br />shall use accepted engineering/ASTM evaluation methods including, but not limited to, triaxial <br />shear test in a supersaturated condition. Borings must be of sufficient depth to allow <br />evaluation of the soils within the Upper Brenna Formation. Report recommendations shall use <br />a minimum 1.3 factor of safety. The County reserves the right for the County Engineer or <br />Planning Commission to reject proposed alternate building control lines. <br />a) The alternate Minimal Disturbance Zone Setback shall meet the requirements set forth in <br />Minimal Disturbance Zone Setback Requirements of this Ordinance. <br />b) The Limited Disturbance Zone Setback Requirements shall apply to all subdivisions <br />employing the alternate method of establishing the Minimal Disturbance Zone Setback. <br />5) Minimal Disturbance Zone Setback Requirements. All property within the minimal <br />disturbance zone setback shall conform to the following regulations: <br />a) No permanent structures shall be allowed except the following: <br />1. Stairways, lifts, and landings. <br />2. Roads, bridges, trails, storm drainage, stormwater management facilities, and <br />utilities are permitted within the minimal disturbance zone provided that an <br />alternatives analysis has clearly demonstrated that no other feasible alternative <br />exists and that minimal disturbance will take place. These structures shall be <br />located, designed, constructed and maintained to provide maximum erosion <br />protection, to have the least adverse effects on wildlife, aquatic life and their