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2018-01-24 CC Packet
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2018-01-24 CC Packet
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Stantec <br /> CITY OF CENTERVILLE -2018 LOCAL WATER PLAN <br /> WATER RESOURCE MANAGEMENT PLAN <br /> 6.4 TOTAL MAXIMUM DAILY LOAD (TMDL) STUDIES <br /> TMDL studies have been completed and approved by the United States Environmental <br /> Protection Agency (U.S. EPA) for both Peltier and Centerville Lakes, and for the Lino Lakes <br /> Chain of Lakes. The Lino Lakes Chain of Lakes TMDL Report was approved on November 25, <br /> 2013, and the Lino Lakes Chain of Lakes TMDL Report was approved on September 27, 2013. <br /> Peltier Lake and Centerville Lake have been listed by the MPCA as impaired for nutrients, with <br /> phosphorus identified as the main pollutant causing the impairment. The TMDL report calls for <br /> a 46% reduction in total phosphorus loading for Peltier Lake and a zero percent reduction for <br /> Centerville. The assumption is that phosphorus reductions to Peltier Lake will benefit <br /> Centerville Lake as well. There is no specific reduction identified for the City; instead, the TMDL <br /> report calls for a "categorical reduction" of 46% that would need to be met by the contributing <br /> watershed. Specific implementation strategies affecting Centerville include implementing <br /> RCWD rules and meeting the requirements of the 2007 Environmental Assessment Worksheet <br /> prepared for the City's Downtown Development. <br /> The Lino Lakes Chain of Lakes are impaired for nutrients, again with phosphorus identified as <br /> the main pollutant. The TMDL report calls for no load reduction from MS4 communities within <br /> the watershed. Instead, internal loading and outflow from Peltier Lake are identified as the <br /> primary phosphorus sources. Meeting the load reduction requirement in the Peltier Lake TMDL <br /> is considered essential to meeting the Lino Lakes Chain of Lakes water quality goals. <br /> 6.5 STORMWATER RUNOFF RATE CONTROL <br /> To prevent flooding associated with increased runoff rates from new developments, rate control <br /> must be provided within each development that maintains existing runoff conditions (or less) for <br /> the 2-year, 10-year, and 100-year storm events. Rates must be determined using Atlas-14 <br /> precipitation frequency estimates. <br /> 6.6 MANAGEMENT OF CLEARWATER CREEK DITCH SYSTEM <br /> Most runoff in the City of Centerville is routed either directly or indirectly to Clearwater Creek. <br /> Clearwater Creek is a natural waterway connected to the Anoka-Washington Judicial Ditch 3 <br /> (AWJD 3) system. The Clearwater Creek Ditch System can be considered a "trunk storm sewer" <br /> for the entire City. RCWD, as the public drainage authority, is responsible for maintenance of <br /> the AWJD 3 system. The system will be managed in accordance with the rate control and water <br /> quality policies outlined in Sections 6.1 and 6.5. <br /> 6.7 INTERCOMMUNITY FLOWS <br /> The City is bounded on all sides by the City of Lino Lakes. Any flows leaving Centerville <br /> therefore enter Lino Lakes. Most the City drains to Peltier Lake, either directly or via Clearwater <br /> Creek. A portion of the City drains to Centerville Lake, which then drains to Peltier Lake. A <br /> 6.23 <br /> 61 <br />
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