Ordinance No. 20351 - Laserfiche WebLink

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subsection, gravel surfaces are not acceptable as porous paving or as an infiltration device. (7) Site Layout. On sites where the /WR conservation area is reduced, high intensity uses within the entire development site, including high volume traffic lanes and truck loading docks, shall be designed and located so that adverse impacts to wetland and riparian habitats within the /WR conservation area are minimized to the greatest extent practicable. (8) Lighting. Within the /WR conservation area, and within areas removed from the /WR conservation area, outdoor area lighting shall be prohibited, except to illuminate walkways, bike paths, pedestrian gathering areas, and parking areas, where these facilities are intended to be used after dark. Outdoor area lighting is lighting designed to illuminate an outdoor activity area, trail or bicycle path. Where lighting is to be provided within the /WR conservation area and within areas removed from the /WR conservation area, the following standards shall apply: (a) Illumination for walkways, pathways or pedestrian gathering areas shall be no more than an average maintained luminance of 0.5 foot-candle at grade. (b) Output from all other light sources shall be no more than an average maintained luminance of 0.9 foot-candle at grade. (c) All lighting fixtures shall be designed to direct light downward to areas intended for human use after dark, and shall be shielded such that light shining toward /WR conservation areas is minimized to the maximum extent practicable. (9) Trails. Within the /WR conservation area, trails shall be constructed of gravel, wood chips or other pervious material, unless otherwise approved by the city manager or decision-maker. Trail construction shall involve the least removal of native vegetation practicable for the area and the minimum amount of fill or excavation practicable. (10) Stream and Channel Crossings. Bridges or other structures that cross streams or wetlands within the /WR conservation area or areas removed from the /WR conservation area shall be constructed so that water flow, vegetation growth and movement of aquatic animals and water dependent wildlife are impeded to the least extent practicable. To meet this standard, bridges and crossings shall include, but are not limited to, applicable items from the following list: (a) Bridges across Category A or Category B streams as identified in the Goal 5 Water Resources Conservation Plan shall, where practicable, be designed to avoid channel constriction when flows reach the top of high bank. Where practicable, bridges shall span a distance 1.2 times the width of the stream channel from top of high bank to top of high bank to help prevent scouring within the structure or at the outlet during less frequent floods. (b) Crossings over Category A or Category B streams as identified in the Goal 5 Water Resources Conservation Plan shall utilize bridges or natural substrate culverts where possible. Where practicable, the lower lip of any natural substrate culvert shall be embedded at least 1 foot for box culverts and pipe arches, and at least 25% of the pipe diameter for pipe culverts. The substrate within the structure shall match the composition of the substrate in the natural stream channel at the time of construction. The substrate shall either resist displacement during flood Ordinance - 17