Orono Community Management Plan 2020-2040

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City of Orono Surface Water Management Plan February 2019 10 There is also shrub, forested, fresh meadow, and shallow open water wetlands scattered throughout the City. Generally, the USFWS Circular 39 classification of these wetlands includes Types 1 through 7. Figure 6 shows wetlands identified by the National Wetland Inventory (NWI) and those larger wetlands that fall under DNR jurisdiction. Additionally, MCWD performed a functional assessment of wetlands within the watershed greater than ¼ acre in size during 2001 – 2003. Wetlands were assigned one of four values, Preserve, or Manage 1, 2, or 3. These management classifications are used in regulating and protecting wetlands by the District. For legal purposes, wetland boundaries must be determined by on- site delineation, usually conducted when development occurs in lands adjacent to a wetland. MCWD’s Functional Assessment of Wetlands can be found at the following link: http://www.minnehahacreek.org/sites/minnehahacreek.org/files/attachments/Figure%2027%20FAW%20 by%20Classification.pdf 2.5 IMPAIRED WATERS The Federal Clean Water Act requires states to establish water quality standards, to test surface waters, and formally list those as "impaired" that do not meet the water quality standards. Subsequent sections presents more detail on the impaired waters program and its relationship to Orono's stormwater management program. A Total Maximum Daily Load (TMDL) study is the next step for an impaired water, although it can be delayed years after identification of the impairment. The TMDL study can result in very specific water quality obligations for Cities. Once the TMDL Study is accepted by the MPCA, an Implementation Plan must be developed, and MS4 Cities must develop an approach to meet the obligations identified in the TMDL Study. Currently, several water bodies located partially or entirely within the City boundary are listed as impaired, and three different TMDL Studies and Implementation Plans have been completed. The Minnesota State Mercury TMDL addresses impairment due to high levels of mercury. The Twin Cities Metropolitan Area Chloride TMDL address impairment due to high levels of chlorides. The Upper Minnehaha Creek Watershed Nutrient and Bacteria TMDL address impairments due to high levels of nutrients and bacteria. Impaired waters in Orono, or those receiving discharge from Orono, are summarized in Table 2.3. Mapping of impaired waters is also depicted on Figure 7. Table 2.3: Impaired Waters** Waterbody/ Watercourse AUID#Listed Pollutant Impaired Use Year Listed Year TMDL Approved Existing Wasteload Allowable Wasteload Painter Creek 07010206- 700 E. Coli Aquatic Recreation 2010 2014 ** Forest Lake 27-0139-00 Nutrient/ Eutrophication Aquatic Recreation 2008 2014 118 lbs/yr 39 lbs/yr Long Lake 27-0160-00 Nutrient/ Eutrophication Aquatic Recreation 2010 2014 224 lbs/yr 100 lbs/yr Lake Minnetonka (Jennings Bay) 27-0133-15 Nutrient/ Eutrophication Aquatic Recreation 2008 2014 244 lbs/yr 92 lbs/yr Lake Minnetonka (Stubbs Bay) 27-0133-12 Nutrient/ Eutrophication Aquatic Recreation 2008 2014 269 lbs/yr 129 lbs/yr Lake Minnetonka (West Arm) 27-0133-14 Nutrient/ Eutrophication Aquatic Recreation 2008 2014 31 lbs/yr 3 lbs/yr Mooney Lake 27-0134-00 Nutrient/ Eutrophication Aquatic Recreation 2010 2014 1 lb/yr .04 lb/yr