2012-10-10 CC Packet - Laserfiche WebLink

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Stantec CENTERVILLE SURFACE WATER MANAGEMENT PLAN WATER RESOURCE MANAGEMENT PLAN September 2012 prepared and submitted to the MPCA each year. Details of the City's SWPPP are available on it website. 6.4 TOTAL MAXIMUM DAILY LOAD (TMDL) STUDIES TMDL studies are underway for Centerville Lake and Peltier Lake and for the Lino Lakes Chain of Lakes. Draft reports have been prepared for both TMDLs, but neither has been approved by the USEPA nor have Implementation Plans been prepared. Peltier Lake and Centerville Lake have been listed by the MPCA as impaired for nutrients, with phosphorus identified as the main pollutant causing the impairment. The TMDL report calls for a 46% reduction in total phosphorus loading for Peltier Lake and a 0% reduction for Centerville. The assumption is that phosphorus reductions to Peltier Lake will benefit Centerville Lake as well. There is no specific reduction identified for the City; instead, the TMDL report calls for a "categorical reduction" of 46% that would need to be met by the contributing watershed as a whole. Specific implementation strategies affecting Centerville include implementing RCWD rules and meeting the requirements of the 2007 Environmental Assessment Worksheet prepared for the City's Downtown Development. The Lino Lakes Chain of Lakes are impaired for nutrients, again with phosphorus identified as the main pollutant. The TMDL report calls for no load reduction from MS4 communities within the watershed. Instead, internal loading and outflow from Peltier Lake are identified as the primary phosphorus sources. Meeting the load reduction requirement in the Peltier Lake TMDL is considered essential to meeting the Lino Lakes Chain of Lakes water quality goals. 6.5 STORM WATER RUNOFF RATE CONTROL In an effort to prevent flooding associated with increased runoff rates from new developments, rate control must be provided within each development that maintains existing runoff conditions (or less) for the 2 -year, 10 -year, and 100 -year storm events. 6.6 MANAGEMENT OF CLEARWATER CREEK DITCH SYSTEM The Clearwater Creek Ditch System can be considered a "trunk storm sewer" for the entire City. Most runoff is routed either directly or indirectly to Clearwater Creek. Therefore, the management of this system is extremely important to the City. The system will be managed in accordance with the rate control and water quality policies outlined in Sections 6.1 and 6.5. 6.7 INTERCOMMUNITY FLOWS The City is bounded on all sides by the City of Lino Lakes. Any flows leaving Centerville therefore enter Lino Lakes. The majority of the City drains to Peltier Lake, either directly or via Clearwater Creek. A portion of the City drains to Centerville Lake, which then drains to Peltier Lake. A small area in the northwestern portion of the City drains directly to Lino Lakes. The One Team. Infinite Solutions. 6.16 35