Sand Hill River Watershed Total Maximum Daily Load Study
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MapsAdd Sand Hill River Watershed Total Maximum Daily Load Study April 2017 wq-iw5-10e Authors and contributors: Mr. Timothy Erickson, PE and Mr. Mark Deutschman, PhD, PE Houston Engineering, Inc. 6901 East Fish Lake Road, Suite 140 Maple Grove, Minnesota 55369 Mr. Cary Hernandez Minnesota Pollution Control Agency 714 Lake Avenue, Suite 220 Detroit Lakes, Minnesota 56501 Acknowledgements: Mr. Dan Wilkins Sand Hill River Watershed District P.O. Box 584 Fertile, Minnesota 56540 Mr. Gary Lee East Polk Soil and Water Conservation District P.O. Box 57 240 Cleveland Avenue Southwest McIntosh, Minnesota 56556 Ms. Lisa Newton East Polk Soil and Water Conservation District P.O. Box 57 240 Cleveland Avenue Southwest McIntosh, Minnesota 56556 The MPCA is reducing printing and mailing costs by using the Internet to distribute reports and information to a wider audience. Visit our website for more information. The MPCA reports are printed on 100% post-consumer recycled paper manufactured without chlorine or chlorine derivatives. Cover Photo Credit: "Sand Hill River Climax Minnesota" by Mathieu Nicklay - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Sand_Hill_River_Climax_Minnesota.jpg#mediaviewer/File:San d_Hill_River_Climax_Minnesota.jpg 2 Contents List of Tables ......................................................................................................................................5 List of Figures .....................................................................................................................................6 TMDL Summary Table ........................................................................................................................8 Acronyms ........................................................................................................................................12 Executive Summary .......................................................................................................................... 14 1. Project Overview ...................................................................................................................... 15 1.1 Purpose ................................................................................................................................................... 15 1.2 Identification of Waterbodies ................................................................................................................. 16 1.3 Priority Ranking ....................................................................................................................................... 19 2. Applicable Water Quality Classification and Numeric Standards ................................................. 19 2.1 Lakes ....................................................................................................................................................... 19 2.2 Streams ................................................................................................................................................... 20 3. Watershed and Waterbody Characterization ............................................................................. 22 3.1 Lakes ....................................................................................................................................................... 24 3.2 Streams ................................................................................................................................................... 24 3.3 Subwatersheds ........................................................................................................................................ 25 3.3.1 Upper Sand Hill River Subwatershed (HUC 0902030103) ................................................... 25 3.3.2 Lower Sand Hill River Subwatershed (HUC 0902030104) ................................................... 25 3.4 Land Use ................................................................................................................................................. 38 3.5 Current/Historical Water Quality ............................................................................................................ 40 3.5.1 Lakes .................................................................................................................................... 42 3.5.2 Streams ............................................................................................................................... 42 3.6 Pollutant Source Summary ...................................................................................................................... 45 3.6.1 Phosphorus ......................................................................................................................... 45 3.6.2 Escherichia coli .................................................................................................................... 53 3.6.3 Total Suspended Solids ....................................................................................................... 62 4 TMDL Development .................................................................................................................. 69 4.1 Phosphorus ............................................................................................................................................. 69 4.1.1 Loading Capacity Methodology .......................................................................................... 69 4.1.2 Load Allocation Methodology ............................................................................................. 71 4.1.3 Wasteload Allocation Methodology ................................................................................... 71 4.1.4 Margin of Safety .................................................................................................................. 72 4.1.5 Critical Conditions and Seasonal Variation ......................................................................... 72 4.1.6 Future Growth/Reserve Capacity........................................................................................ 72 4.1.7 TMDL Summary ................................................................................................................... 73 SHRW Watershed TMDL Minnesota Pollution Control Agency 3 4.2 Escherichia coli ........................................................................................................................................ 75 4.2.1 Loading Capacity Methodology .......................................................................................... 75 4.2.2 Load Allocation Methodology ............................................................................................. 77 4.2.3 Wasteload Allocation Methodology ................................................................................... 77 4.2.4 Margin of Safety .................................................................................................................. 78 4.2.5 Critical Conditions and Seasonal Variation ......................................................................... 78 4.2.6 Future Growth/Reserve Capacity........................................................................................ 79 4.2.7 TMDL Summary ................................................................................................................... 79 4.3 Total Suspended Solids ........................................................................................................................... 81 4.3.1 Loading Capacity ................................................................................................................. 81 4.3.2 Load Allocation Methodology ............................................................................................. 83 4.3.3 Wasteload Allocation Methodology ................................................................................... 83 4.3.4 Margin of Safety .................................................................................................................. 84 4.3.5 Critical Conditions and Seasonal Variation ......................................................................... 84 4.3.6 Future Growth Consideration/Reserve Capacity ................................................................ 85 4.3.7 TMDL Summary ................................................................................................................... 85 5 Reasonable Assurance .............................................................................................................. 86 6 Monitoring Plan ........................................................................................................................ 88 7 Implementation Strategy Summary ........................................................................................... 89 7.1 Permitted Sources ................................................................................................................................... 89 7.1.1 MS4 ..................................................................................................................................... 89 7.1.2 Construction Stormwater ................................................................................................... 90 7.1.3 Industrial Stormwater ......................................................................................................... 90 7.1.4 Wastewater ........................................................................................................................