2018-09-12 CC Packet - Laserfiche WebLink

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a ntec CITY OF CENTERVILLE -2018 LOCAL WATER PLAN 6. Pollution prevention in municipal operations The City has identified best management practices (BMPs) and measurable goals associated with each minimum control measure. An annual report on the implementation of the SWPPP is prepared and submitted to the MPCA each year. Details of the City's SWPPP are available on its website. 6.4 TOTAL MAXIMUM DAILY LOAD (TMDL) STUDIES TMDL studies have been completed and approved by the United States Environmental Protection Agency (U.S. EPA) for both Peltier and Centerville Lakes, and for the Lino Lakes Chain of Lakes. The Lino Lakes Chain of Lakes TMDL Report was approved on November 25, 2013, and the Lino Lakes Chain of Lakes TMDL Report was approved on September 27, 2013. 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 zero percent 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. Specific implementation strategies affecting Centerville include the RCWD implementing its rules and the City meeting the requirements of the 2007 Environmental Assessment Worksheet prepared for the City's Downtown Development. The City's Trail Side Park Stabilization Project (Phase I & 11) will help to address phosphorus and sediment loading as detailed in the TMDL goals for Peltier, Centerville and Lino Lakes Chain of Lakes. This project involved adding 650 feet of rip-rap along the shoreline of Centerville Lake, where shoreline erosion was an issue. Stabilizing the shoreline prevented soil from entering into Centerville Lake, which in turn prevents sediment and phosphorus from moving into the Lake. 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. In addition to the previous mentioned TMDLs, the City is a named regulated MS4 for the Upper Mississippi River Bacteria TMDL. In March 2016, the Upper Mississippi Bacteria TMDL Implementation Plan was released. In urban areas, reducing inputs from pets, wildlife and humans will be most helpful in addressing bacteria loading into lakes and streams. To aid in the TMDL's implementation, the City details its pet waste education efforts, as discussed in Section 5.2 Objective 6(a). Other recommendations to address this TMDL, which the City will make an effort to incorporate, include: • Adding infiltration BMPs downstream of parks/residential areas and upstream of stormwater pipes. 24 119