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May 19, 2022 <br />43 <br /> <br />6. Along rivers, existing shading of water surfaces is preserved. <br />7. The above provisions are not applicable to the removal of trees, limbs <br />or branches that are dead, diseased, or pose safety hazards. <br />6. Limited Disturbance Zone Setback Requirements. All property within the limited <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 <br />and water quality. Following any disturbance, the impacted area shall be <br />restored. <br />iii. Bike paths, walking trails, or other multi-use paths. <br />iv. One accessory building not to exceed one hundred and twenty (120) square <br />feet. <br />b. No additional fill shall be allowed. <br />c. No grading shall be allowed, except grading for bank restoration in areas <br />experiencing bank slumping. <br />d. On-site septic systems and drain fields shall not be allowed. <br />e. Irrigation systems shall not be allowed. <br /> <br />(i) Vegetative Buffer Requirements. <br />1. Purpose. A vegetative buffer is a strip of undisturbed native vegetation, either original or <br />reestablished, that borders streams, rivers, ponds and lakes, wetlands, and seeps. These <br />vegetative buffer areas filter excess sediment, provide flood protection, reduce storm runoff <br />velocities, protect channel bank areas from scour and erosion, stabilize riverbanks and <br />provide shade to cool adjacent water. <br />2. A vegetative buffer shall be required along all blue line perennial watercourses and <br />wetlands as identified on the most recent version of a 1:100,000 or 1:24,000 USGS <br />quadrangle map based on the following requirements. <br />a. In areas where a floodway profile has been computed as part of an approved flood <br />study, the buffer zone shall be the width of the floodway plus at least fifty (50) feet <br />perpendicular from the edge of the floodway on each side of the waterway. <br />b. In areas where a floodway profile has not been computed as part of an approved <br />flood study, the buffer zone shall be at least fifty (50) feet perpendicular from the <br />top of bank on each side of the waterway.