Ord2005 1130-336 - Laserfiche WebLink

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Atty/OrdlOrd.243 111505 12/5/2005 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 the Engineering and Construction Division, allows for alternate methods of treatment including, but not limited to, infiltration basins and in-line filtration. Drainage from parking garage surfaces shall be collected and treated prior to discharge from the site or may be directed to permeable areas of the site for treatment, subject to approval by the Engineering and Construction Division. E. On-Site Treatment of Runoff: All treatment of runoff, whether through site design, source control or stormwater treatment measures, shall require approval by the Engineering and Construction Division consistent 1130-336 18 ."._--------_.,,-,,------------------