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Pavement Management Plan
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Pavement Management Plan
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2/10/2011 10:24:41 AM
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2/10/2011 10:24:35 AM
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Irrigation System <br /> Two ponds within the development on the east and west sides of the site are proposed to <br /> provide the primary water quality treatment. These ponds are routed downstream to either of <br /> two pond options. <br /> Option 1: Route both downtown ponds via a large gravity pipe to the existing pond in St <br /> Genevieve's Church property. <br /> Option 2: Route both downtown ponds to a future constructed pond in LaMotte Park. <br /> Option 1 is dependent on discussions with St Genevieve's Church and detailed analysis of the <br /> existing pond. A pump would then be consVucted from either pond option connected to a <br /> proposed irrigation system in LaMotte Park. The irrigation system would reuse the downtown <br /> siormwater on the LaMotte Park fields, essentially eliminating discharge for small storm events. <br /> An adjacent groundwater supply well is recommended to feed the pond during dry conditions <br /> and allow for continued field irrigation. <br /> The concept of the irrigation system was discussed with RCWD staff. Ongoing discussions will <br /> be necessary to finalize the detailed system, but it is considered an acceptable BMP. There are � <br /> numerous benefits to irrigation systems utilizing stormwater — reduces runoff volume, spreads <br /> stormwater over large su�face area, beneficial for low permeability soils, provides evaporation, I <br /> biological uptake and soil adsorption, high pollutant removal efficiency, <br /> Utilizing the irrigation system provides the majority of the required bioretention volume needed <br /> to meet RCWD requirements for the downtown redevelopment. A portion of the area north of <br /> CSAH 14 cannot be gravity piped into this system based on existing grades and would require <br /> smaller scale BMPs as shown. Area 4 adjacent to Centerville Lake would also require small <br /> scale BMPs onsite. <br /> Refer to the attached sheet for general assumptions regarding the preliminary stormwater <br /> system design. I I <br /> Centerville lake TMDL Study <br /> Both Centerville Lake and Clearwater Creek are listed as impaired waterbodies by the MPCA — I <br /> a waterbody that does not meet water quality standards and designated uses because of <br /> "pollutant(s), pollution, or unknown causes of impairment". Clearwater Creek is impaired for <br /> fish and invertebrate index of biotic integrity and Centerville Lake is impaired for nutrients. <br /> RCWD is in the process of completing a TMDL study for CenteNille Lake. Additional <br /> stormwater analysis may be necessary once the TMDL study is accepted. <br />
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