07-26-2021 Council Packet - Laserfiche WebLink

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17 Two Five 15 25 foot pole street lights with down lit shields are proposed along the private road and parking areas in the cottage home neighborhood. The photometric plan indicates zero (0) foot candle levels protruding onto adjacent residential properties as required. The applicant shall work with the local electric company to design a street lighting plan for the public road. • Security or service lighting should be limited in coverage area and designed to reduce glare. Wall mounted down lit lighting is proposed on the exterior of the senior housing complex and clubhouse. Stormwater Management • Stormwater management design must incorporate filtration and infiltration elements. This could include such features as rain gardens, swales, dry creeks, infiltration chambers, and other ecologically based methods along with more traditional ponds and pipes. • Stormwater management ponds, if used, should be designed to be a site amenity, including appropriate landscape elements. Per the revised Storm Water Management Report prepared by Anderson-Johnson Associates dated March 11, 2019, May 8, 2020 July 13, 2020 July 14, 2021, rate control is being accomplished using a combination of a dry pond and a storm water treatment pond. The dry pond is now located where the original community gardens were proposed. The proposed rate is less than 80% of the existing rate of runoff. Water quality treatment is accomplished at the single stormwater treatment pond. True infiltration was considered during the design phase, but several factors contributed to not pursuing infiltration practices. First, shallow groundwater exists on site. According to the soil borings, groundwater is in the 895 to 897 elevation range. A majority of the low points are around elevation 905 with one parking lot having a low point of about 902.5. This would mean the surface of an infiltration area would need to be at elevation 900 - 901 for effective drainage to occur. Additionally, the site has been maximized and there is not adequate space for effective infiltration practices. Instead, a stormwater pond has been constructed. The stormwater pond, in addition to providing rate control, has been sized to provide adequate dead storage below the normal water level to meet water quality requirements. Finally, an irrigation pumping station will be constructed at the stormwater pond to draw water from the pond to irrigate the surrounding areas. As detailed in the May 11, 2020 Council staff report and Resolution No. 22-44 approving PUD Development Stage Plan Amendment #1 to the site plan and grading & drainage plan, the clubhouse was omitted in order to enlarge to the stormwater pond to provide more capacity.