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June 16, 2022 <br />40 <br /> <br />delineate building control lines on the recorded plat limiting certain activities and land uses <br />in 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 <br />and Wild Rice rivers. All other blue line perennial watercourses Minimal Disturbance <br />Zone Setback may be based on the three hundred and fifty (350) foot setback or be <br />equal to vertical difference between the top of bank and the river bottom (plus any <br />additional flood 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 <br />determination shall use accepted engineering/ASTM evaluation methods including, but not <br />limited to, triaxial shear test in a supersaturated condition. Borings must be of sufficient <br />depth to allow evaluation of the soils within the Upper Brenna Formation. Report <br />recommendations shall use a minimum 1.3 factor of safety. The County reserves the right <br />for the County Engineer or Planning Commission to reject proposed alternate building <br />control lines. <br />a. The alternate Minimal Disturbance Zone Setback shall meet the requirements set <br />forth in 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 <br />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 />i. Stairways, lifts, and landings. <br />ii. Roads, bridges, trails, storm drainage, stormwater management facilities, <br />and utilities are permitted within the minimal disturbance zone provided <br />that an alternatives analysis has clearly demonstrated that no other feasible <br />alternative exists and that minimal disturbance will take place. These <br />structures shall be located, designed, constructed, and maintained to <br />provide maximum erosion protection, to have the least adverse effects on <br />wildlife, aquatic life and their habitats and to maintain hydrologic processes