Agda Pkt 2026.07.13 Joint SA PFA

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ATTY/ORD.0006/CC ORD ADOPT AMENDMENTS TO THE ZONING CODE – EXHIBIT A REV: 07-08-26 MI Page 53 of 103 which comprises fifty percent (50%) or more of the existing impervious area of the site shall comply with the provisions of Subsections D (Infiltration of Stormwater) and E (On-Site Treatment of Runoff) of this Section for the entire site. 3. All new development that proposes an increase in impervious area and/or replacement of impervious area of more than ten thousand (10,000) square feet on a site, and the total of which does not comprise more than fifty percent (50%) of the existing impervious area of the site, shall comply with the provisions of Subsections D (Infiltration of Stormwater) and E (On- Site Treatment of Runoff) of this Section for the portion(s) of the site where impervious area is added or replaced. 4. All new development shall comply with the provisions of Subsection F (Creek Protection and Setbacks). 5. Notwithstanding the above provisions, any project that adds and/or replaces impervious area of one (1) acre or greater shall comply with the provisions of all Subsections C, D, E and F of this Section. 6. Increases in impervious area and replacement of existing impervious area shall include all (cumulative) development of a site over any five (5) year period, as determined by the Zoning Administrator, to assure compliance in the event of multiple phases of development. C.Minimum Pervious Areas. All development as outlined in Subsection (B)(1) of this section shall comply with the minimum pervious area requirements for the pertinent zoning district within which the site is located, subject to the following provisions: 1. Pervious area may be comprised of pervious landscape area, vegetated open space or pervious paving materials, subject to the Engineering and Construction Division's determination of the appropriate permeability ratio for such materials. The Engineering and Construction Division shall maintain a listing of acceptable materials and assumed permeability ratios, which may vary depending on site factors. 2. Areas in park strips in the public right-of-way (between the sidewalk and the roadway) or in an easement may be included as pervious area for the site if: (a) the park strip area is paved or is barren (without vegetation) prior to development; and (b) the area is converted to landscaping and is used to capture and treat a portion of the drainage from the site, subject to approval of the Engineering and Construction Divisions. 3. Where the replacement of impervious area comprises greater than fifty percent (50%) of the existing impervious area on the site, but no net increase in impervious area is proposed, the Zoning Administrator may allow the use of engineering on-site treatment (in-line filtration or similar means) for stormwater management in lieu of pervious area requirements, subject to approval by the Engineering and Construction Division. 4. For land uses that require a high percentage of impervious surface area and that have a potential to generate significant quantities of surface pollutants such as service stations, car washes, automobile repair services or similar uses, the Zoning Administrator may require the use of grease traps, water recycling systems, and/or other means of stormwater protection in lieu of or in addition to pervious area limitations. D.Infiltration of Stormwater. Drainage from development sites, and particularly from parking lots, shall be directed to landscape, vegetated swales or other permeable areas for filtration of runoff prior to discharge from the site, unless the Zoning Administrator, with the approval of 8.B. - Page 75 of 212 390