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City of Orono <br />Surface Water Management Plan February 2019 11 <br />Waterbody/ <br />Watercourse AUID#Listed <br />Pollutant <br />Impaired <br />Use <br />Year <br />Listed <br />Year <br />TMDL <br />Approved <br />Existing <br />Wasteload <br />Allowable <br />Wasteload <br />Tanager Lake 27-0141-00 Nutrient/ <br />Eutrophication <br />Aquatic <br />Recreation <br />2010 2014 114 lbs/yr 55 lbs/yr <br />Wolsfeld Lake 27-0157-00 Nutrient/ <br />Eutrophication <br />Aquatic <br />Recreation <br />2010 2014 3 lb/yr 1 lb/yr <br />*Refer to the Upper Minnehaha Creek Watershed Nutrient and Bacteria TMDL for allowable bacteria counts per various <br />flow regimes. <br />**Refer to the City’s SWPPP for information regarding Impaired Waters and TMDLs. <br />2.6 MONITORING AND DATA COLLECTION <br />Orono does not monitor surface water resources nor is it equipped to do so. However, the City will <br />continue to support monitoring of surface waters within the City. Data will be obtained through <br />cooperation and coordination with other various agencies, including the Minnehaha Creek Watershed <br />District (MCWD), Minnesota Pollution Control Agency (MPCA), adjacent cities, the Three Rivers Park <br />District, the Metropolitan Council, and the Department of Natural Resources. <br />MCWD conducts its own monitoring program, which includes surface waters within the City of Orono. <br />The data is used to assess water bodies with the intent to identify capital improvement needs, evaluate <br />previous capital improvements, provide calibration for its hydrologic, hydraulic, and pollutant loading <br />model, and promote greater understanding of the overall health of the watershed. <br />MCWD uses the Ecosystem Evaluation Assessment Program (E-Grade) to evaluate shallow and deep <br />lakes, streams, wetlands, and uplands for biodiversity, habitat diversity, nutrient cycling, recreation, flood <br />control, and groundwater quality to determine the overall health of the watershed. In addition to <br />phosphorus and chlorophyll concentration and water clarity (data used previously to determine lake <br />grades by the District), E-Grades will also include data on fish, aquatic insects, and wetland vegetation to <br />evaluate resources. <br />Monitoring data from the water bodies sampled by MCWD and E-Grades are available on their website <br />at:www.minnehahacreek.org. <br />Other water quality information can be found from the Three Rivers Park District, Metropolitan Council, <br />and the Minnesota Pollution Control Agency on the following websites: <br />·Three Rivers Park District:http://www.threeriversparks.org <br />·Metropolitan Council:http://www.metrocouncil.org <br />·Minnesota Pollution Control Agency:http://www.pca.state.mn.us <br />2.7 GROUNDWATER RESOURCES <br />Water quality of surface waters can have great effect on groundwater due to the interaction via <br />groundwater recharge and discharge. Orono relies strictly on groundwater (aquifers) for drinking water, <br />and therefore, groundwater quality is equally as important as surface water quality. In the City of Orono, <br />there are several sources of groundwater, or "aquifers". Of these, there are three significant aquifers from <br />which groundwater are currently being used: <br />1.The quaternary (water table) aquifer, is found in glacial deposits, <br />2.The St. Peter aquifer, found in a layer of sandstone just below the glacial deposits, and <br />3.The Prairie du Chien-Jordan aquifer, found in adjoining dolomite-sandstone below the St. Peter <br />formation.