MOLALLA-PUDDING WATERSHED TOTAL MAXIMUM DAILY LOAD IMPLEMENTATION PLAN Clackamas County February 2012 MOLALLA-PUDDING SUBBASIN TOTAL MAXIMUM DAILY LOAD IMPLEMENTATION PLAN Prepared for Clackamas County February 2012 This is a draft report that may be updated prior to finalization. TABLE OF CONTENTS LIST OF TABLES ......................................................................................................................................................... iv LIST OF FIGURES ....................................................................................................................................................... iv SECTION A OVERVIEW Chapter 1. INTRODUCTION ............................................................................................................................................. 1 2. CLACKAMAS COUNTY SURFACE WATER OVERVIEW .............................................................................. 2 2.1 Watersheds .............................................................................................................................................. 2 2.2 Organizational Summary .......................................................................................................................... 3 2.3 Surface Water Responsibilities ................................................................................................................. 3 3. TMDL PARAMETERS AND ALLOCATIONS ................................................................................................... 7 3.1 Temperature ............................................................................................................................................. 7 3.2 E. coli ........................................................................................................................................................ 8 3.3 Pesticides (DDT, Dieldrin, Chlordane) .................................................................................................... 8 3.4 Mercury ..................................................................................................................................................... 9 3.5 Nitrate ....................................................................................................................................................... 9 3.6 Metals (Iron, Manganese, Aresnic) ........................................................................................................... 9 4. GOALS AND OBJECTIVES OF PLAN ............................................................................................................ 9 SECTION B POLLUTANT REDUCTION AND MANAGEMENT STRATEGIES Chapter 5. POTENTIAL SOURCES OF POLLUTANTS .................................................................................................. 11 6. TMDL IMPLEMENTATION RESPONSIBILITIES .......................................................................................... 16 7. CLACKAMAS COUNTY WATER QUALITY PROGRAMS AND ACTIVITIES ............................................... 19 7.1 Development Regulations and Watershed Protection ............................................................................ 19 7.2 Erosion Control ....................................................................................................................................... 23 7.3 Public Involvement and Education .......................................................................................................... 24 7.4 Pet Waste Management ......................................................................................................................... 28 7.5 Septic System Management ................................................................................................................... 29 7.6 Illegal Dumping Management ................................................................................................................. 30 7.7 Dead Animal Management ..................................................................................................................... 31 7.8 Spill Response and Illicit Discharge Elimination Programs ..................................................................... 32 i Molalla-Pudding Subbasin TMDL Implementation Plan for Clackamas County DRAFT for review purposes only. Molalla-Pudding Subbasin TMDL Implementation Plan Contents 7.9 Riparian Assessment and Management ................................................................................................... 33 SECTION C IMPLEMENTATION Chapter 8. TEMPERATURE ......................................................................................................................................... 35 8.1 Matrix of Management Strategies ............................................................................................... 35 8.2 Barriers to Implementation.......................................................................................................... 35 8.3 Implementation Monitoring, Annual Status Reports, and Evaluation Reports ............................ 35 8.4 Effectiveness Monitoring............................................................................................................. 35 8.5 Timeline ...................................................................................................................................... 36 9. E. COLI (BACTERIA) ..................................................................................................................................... 38 9.1 Matrix of Management Strategies ............................................................................................... 38 9.2 Barriers to Implementation.......................................................................................................... 38 9.3 Implementation Monitoring, Annual Status Reports, and Evaluation Reports ............................ 39 9.4 Effectiveness Monitoring............................................................................................................. 39 9.5 Timeline ...................................................................................................................................... 39 10. DDT & DIELDRIN .......................................................................................................................................... 42 10.1 Matrix of Management Strategies ............................................................................................... 42 10.2 Barriers to Implementation.......................................................................................................... 42 10.3 Implementation Monitoring, Annual Status Reports, and Evaluation Reports ............................ 42 10.4 Effectiveness Monitoring............................................................................................................. 42 10.5 Timeline ...................................................................................................................................... 43 11. MERCURY ..................................................................................................................................................... 45 11.1 Matrix of Management Strategies ............................................................................................... 45 11.2 Barriers to Implementation.......................................................................................................... 45 11.3 Implementation Monitoring, Annual Status Reports, and Evaluation Reports ............................ 46 11.4 Effectiveness Monitoring............................................................................................................. 46 11.5 Timeline ...................................................................................................................................... 46 12. IRON .............................................................................................................................................................. 49 12.1 Matrix of Management Strategies ............................................................................................... 49 12.2 Barriers to Implementation.......................................................................................................... 49 12.3 Implementation Monitoring, Annual Status Reports, and Evaluation Reports ............................ 49 12.4 Effectiveness Monitoring............................................................................................................. 49 12.5 Timeline ...................................................................................................................................... 50 13. REVIEW AND REVISION OF PLAN .............................................................................................................. 52 ii Molalla-Pudding Subbasin TMDL Implementation Plan for Clackamas County DRAFT for review purposes only. Molalla-Pudding Subbasin TMDL Implementation Plan 14. STATEWIDE LAND USE REQUIREMENTS ................................................................................................. 52 15. CITATION OF LEGAL AUTHORITY .............................................................................................................. 52 16. REFERENCES .............................................................................................................................................. 53 iii Molalla-Pudding Subbasin TMDL Implementation