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Spokane River / Lake Spokane Dissolved Oxygen Water Quality Improvement Report Page Iii

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Spokane River / Lake Spokane Dissolved Oxygen Water Quality Improvement Report Page Iii Spokane River and Lake Spokane Dissolved Oxygen Total Maximum Daily Load Water Quality Improvement Report Revised February 2010 Publication No. 07-10-073 Publication and Contact Information This report is available on the Department of Ecology’s website at www.ecy.wa.gov/biblio/0710073.html Revised For more information contact: Washington State Department of Ecology Eastern Regional Office Water Quality Program 4601 North Monroe Street Spokane, WA 99205-1295 Phone: (509) 329-3400 Washington State Department of Ecology - www.ecy.wa.gov/ o Headquarters, Olympia 360-407-6000 o Northwest Regional Office, Bellevue 425-649-7000 o Southwest Regional Office, Olympia 360-407-6300 o Central Regional Office, Yakima 509-575-2490 o Eastern Regional Office, Spokane 509-329-3400 Cover photo: Spokane River at Riverside State Park, Spokane (David Moore) Project Codes and 1996 303(d) Waterbody ID Numbers Data for this project are available at Ecology’s Environmental Information Management (EIM) website at www.ecy.wa.gov/eim/index.htm. Search User Study ID, BCUS0005 Project Tracker Code (Environmental Assessment Program) is 01-025. TMDL Study Code (Water Quality Program) is SRWS99DO. Waterbody Numbers: WA-54-1010 (QZ45UE), WA-54-1020 (QZ45UE), WA-54-9040 (QZ45UE), WA-55-1010 (TD36NP), WA-56-1010 (JZ70CP), WA-57-1010 (QZ45UE) Any use of product or firm names in this publication is for descriptive purposes only and does not imply endorsement by the author or the Department of Ecology. To ask about the availability of this document in a format for the visually impaired, call the Water Quality Program at 360-407-6404. Persons with hearing loss can call 711 for Washington Relay Service. Persons with a speech disability can call 877-833-6341. Spokane River and Lake Spokane Dissolved Oxygen Total Maximum Daily Load Water Quality Improvement Report by David J. Moore Water Quality Program and James Ross Environmental Assessment Program Washington State Department of Ecology Eastern Regional Office Spokane, Washington This page is purposely left blank Table of Contents Page Table of Contents ........................................................................................................................... iii List of Figures and Tables............................................................................................................... v Abstract ......................................................................................................................................... vii Acknowledgements ........................................................................................................................ ix Executive Summary ........................................................................................................................ v What is a Total Maximum Daily Load (TMDL)? .......................................................................... 1 Federal Clean Water Act requirements ............................................................................... 1 TMDL process overview .................................................................................................... 2 Who should participate in this TMDL? .............................................................................. 2 Elements required by the Clean Water Act in a TMDL ..................................................... 2 Why Ecology Conducted a TMDL Study in this Watershed .......................................................... 5 Background ......................................................................................................................... 5 Impairments addressed by this TMDL ............................................................................... 6 Water Quality Standards and Numeric Targets .............................................................................. 9 Dissolved Oxygen ............................................................................................................... 9 Watershed Description .................................................................................................................. 13 Geographic setting ............................................................................................................ 13 TMDL Analysis ............................................................................................................................ 17 Project goals ...................................................................................................................... 17 Study quality assurance evaluation ................................................................................... 17 Technical analysis ............................................................................................................. 17 Modeling Selection, Results and Discussion ................................................................................ 27 Selection of TMDL scenario ............................................................................................. 27 Loading capacity ............................................................................................................... 30 Load and Wasteload Allocations .................................................................................................. 33 Wasteload allocations ....................................................................................................... 33 Load allocations ................................................................................................................ 36 Seasonal variation in Lake Spokane ................................................................................. 40 Avista’s Dissolved Oxygen Responsibility .................................................................................. 44 Margin of Safety ........................................................................................................................... 51 Spokane River / Lake Spokane Dissolved Oxygen Water Quality Improvement Report Page iii Reasonable Assurance .................................................................................................................. 53 Managed Implementation Plan ..................................................................................................... 59 Introduction ....................................................................................................................... 59 What needs to be done? .................................................................................................... 60 Who needs to participate? ................................................................................................. 60 What is the schedule for achieving water quality standards? ........................................... 72 Monitoring progress .......................................................................................................... 76 Adaptive management ...................................................................................................... 78 Potential funding sources .................................................................................................. 80 Summary of public involvement methods ........................................................................ 82 Next steps .......................................................................................................................... 84 References ..................................................................................................................................... 85 Appendices .................................................................................................................................... 91 Appendix A. Glossary, acronyms, and abbreviations .................................................... A-1 Appendix B. Record of public participation .................................................................. B-1 Appendix C. Response to public comments .................................................................. C-1 Appendix D: 2007 Memorandum of Agreement and Foundational Concepts .............. D-1 Appendix E: Overview of Modeling Assessment for 2009 TMDL ................................ E-1 Appendix F: Spokane River TMDL Oversight Committee Organization ...................... F-1 Appendix G: November 2004 Modelers Agreement ..................................................... G-1 Appendix H: September 26, 2008 EPA Statement Announcing TMDL Reversal ........ H-1 Appendix I: October 24, 2008 Ecology Interpretation of Water Quality Standards to EPA .......................................................................................................... I-1 Appendix J: March 24, 2009 Memo from EPA to Ecology ........................................... J-1 Appendix K: Spokane River Basin Stormwater Loading Analysis for 2009 TMDL .... K-1 Appendix L: September 28, 2005 Spokane River TMDL Collaboration Technology Workgroup Memo on Wastewater Treatment Facilities Achieving Low Total Phosphorus Effluent ......................................................................... L-1 Appendix M: Tributary and groundwater nutrient load summary ................................ M-1 Spokane River / Lake Spokane Dissolved Oxygen Water Quality Improvement Report Page iv List of Figures and Tables Figures Page Figure 1. Spokane River watershed map. ............................................................................15 Figure 2. Selected model-predicted dissolved oxygen profiles for Lake Spokane
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