COOS and COQUILLE AREA AGRICULTURAL WATER QUALITY MANAGEMENT PLAN Developed by the Coos and Coquille Local Advisory Committee and The Oregon Department of Agriculture with Assistance from The Coos County Soil and Water Conservation District March 29, 2006 Updated June 3, 2010 Local Advisory Committee Members Eric Aasen Jolly Hibbits Joan Mahaffy Jeff Cochran Tom Johnson JoAnn Mast Jordan Utsey (deceased) Steve Cooper Bonnie Joyce Dave Messerle Heath Hampel Roland Ransdell Coos and Coquille Area Agricultural Water Quality Management Plan June 3, 2010 Page 2 Table of Contents Acronyms........................................................................................................................................................................... 5 Foreword ............................................................................................................................................................................ 6 Applicability ...................................................................................................................................................................... 6 Introduction........................................................................................................................................................................ 6 Agriculture in the Coos and Coquille Watersheds....................................................................................................... 8 Agriculture in the Tenmile Watershed ......................................................................................................................... 9 Fish in the Coos, Coquille, and Tenmile Watersheds .................................................................................................. 9 The Watershed as an Ecosystem................................................................................................................................. 10 Goals and Objectives of the Area Plan ........................................................................................................................... 10 Physical Setting................................................................................................................................................................ 11 Climate Information .................................................................................................................................................... 11 The Coos Watershed ................................................................................................................................................... 12 The Coquille Watershed.............................................................................................................................................. 13 The Tenmile Lakes Watershed ................................................................................................................................... 13 The Twomile and Fourmile Watersheds .................................................................................................................... 14 Administrative Roles and Responsibilities..................................................................................................................... 15 The Clean Water Act................................................................................................................................................... 15 Total Maximum Daily Loads...................................................................................................................................... 15 Designated Management Agency ............................................................................................................................... 16 Water Quality Issues........................................................................................................................................................ 17 Beneficial Uses............................................................................................................................................................ 16 A. Algae or Aquatic Weeds ....................................................................................................................................... 17 B. Bacteria (Escherichia coli) .................................................................................................................................... 17 C. Chlorophyll a ......................................................................................................................................................... 18 D. Dissolved Oxygen ................................................................................................................................................. 18 E. Habitat Modification.............................................................................................................................................. 19 F. pH ........................................................................................................................................................................... 19 G. Sedimentation ........................................................................................................................................................ 19 H. Temperature........................................................................................................................................................... 20 I. Toxics ...................................................................................................................................................................... 22 Point and Nonpoint Source Pollution ......................................................................................................................... 22 Historical Perspective.................................................................................................................................................. 23 The Coastal Zone Act.................................................................................................................................................. 23 Pollution Prevention and Control Measures................................................................................................................... 23 Statutes Addressing Water Pollution.......................................................................................................................... 24 Sediment Management................................................................................................................................................ 25 Nutrient Management.................................................................................................................................................. 26 Pesticide Management................................................................................................................................................. 29 Riparian Management ................................................................................................................................................. 30 Pasture Management ................................................................................................................................................... 31 Channelized Streams, Ditch and Tidegate Management ........................................................................................... 33 Irrigation Management................................................................................................................................................ 34 Implementation and Public Participation........................................................................................................................ 35 Monitoring and Evaluation.............................................................................................................................................. 36 Enforcement Actions and Resolution of Complaints..................................................................................................... 38 ODA Formal Water Quality Complaince Procedure Chart ........................................................................................... 41 Total Maximum Daily Loads .......................................................................................................................................... 42 Appendices....................................................................................................................................................................... 45 Appendix A - Fish and Shellfish Species Found in the Watershed Area...................................................................... 47 Appendix B - Fish Life Histories.................................................................................................................................... 49 Appendix C - Coastal Zone Management Act — Management Measures................................................................... 51 Appendix D - South Coast Basin Beneficial Uses ......................................................................................................... 55 Appendix E - Management Area Maps .......................................................................................................................... 57 Coos and Coquille Area Agricultural Water Quality Management Plan June 3, 2010 Page 3 Appendix F - Technical and Financial Resources for Landowners..............................................................................