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574 <br />575 <br />576 <br />577 <br />578 <br />579 <br />580 <br />581 <br />582 <br />583 <br />584 <br />585 4. <br />586 <br />587 <br />588 <br />589 <br />590 <br />591 <br />592 <br />593 <br />d. Where principal structures exist on the adjoining lots on both sides of a proposed building site, <br />the minimum setback may be altered to conform to the average of the adjoining setbacks, <br />provided that the new structure's scale and bulk riverward or bluffward of the setbacks required <br />under Section 117-148(f)3 (Structure and impervious surface placement) consistent with <br />adjoining development. See Figure 6. <br />Figure 6. Structure Setback Averaging <br />Structure Setback Averaging <br />Existing <br />Required principal <br />structure <br />setback structure — <br />— <br />Proposed Existing <br />principal principal <br />structure — — — — structure <br />— — — — — — <br />Average <br />structure <br />— — — <br />setback <br />3 <br />--------- <br />+ _ Y <br />+----—+Y 2 --- ------- — <br />I -- �— <br />— <br />Share <br />No structures in the SIZ <br />Impact <br />Zone (SIZ7 <br />OHWL <br />The scale and bulk of a proposed principal <br />structure <br />must be consistent with existing principal <br />structures. <br />e. Subsurface sewage treatment systems, including the septic tank and absorption area, must be <br />located at least 75 feet from the ordinary high water level of the Mississippi River and all other <br />public waters. <br />Lot size and buildable area. <br />a. The width of lots abutting the Mississippi River in the ROS District must be at least 200 <br />feet, unless alternative design methods are used that provide greater protection of the <br />riparian area. <br />b. All new lots must have adequate buildable area to comply with the setback <br />requirements of Section 117-148(f)3 (Structure and impervious surface placement) so as <br />to not require variances to use the lots for their intended purpose. <br />594 g. PERFORMANCE STANDARDS FOR PRIVATE FACILITIES <br />595 1. Purpose. To establish design standards for private facilities that are consistent with best management <br />596 practices and that minimize impacts to primary conservation areas, public river corridor views and other <br />597 resources identified in the MRCCA plan. <br />598 2. General design standards. All private facilities must be developed in accordance with the vegetation <br />599 management and land alteration requirements in Sections 117-148(i) (Vegetation management) and <br />600 117-148(j) (Land alteration standards and stormwater management). <br />601 3. Private roads, driveways, and parking areas. Except as provided in Section 117-148(I) (Exemptions), <br />602 private roads, driveways and parking areas must: <br />17 12/30/2020 <br />