APPENDIX D, NEWPORT BAY WATERSHED ACTION PLAN TABLE OF CONTENTS Executive Summary ................................................................................................................................... 4 Executive Summary ................................................................................................................................... 4 D-1.0 Introduction ................................................................................................................................... 6 D-1.1 Watershed Setting ........................................................................................................ 9 D-1.2 Beneficial Uses ........................................................................................................... 18 D-1.3 Constituents of Concern ........................................................................................... 22 D-1.4 Watershed Program Management .......................................................................... 23 D-1.4.1 NPDES Coordination ......................................................................... 23 D-1.4.2 Watershed Management Framework .............................................. 23 D-2.0 Water Quality Assessment ........................................................................................................ 27 D-2.1 Summary of Monitoring Activities ......................................................................... 28 D-2.1.1 NPDES Monitoring and Assessment Program .............................. 28 D-2.1.2 OCHCA Bacteria Monitoring ........................................................... 32 D-2.1.3 Toxics Substances Monitoring Program and State Mussel Watch ........................................................................................................... 32 D-2.1.4 SCCWRP Bight Study ........................................................................ 34 D-2.1.5 Special Studies .................................................................................... 34 D-2.2 Assessment of Data and Studies .............................................................................. 34 D-2.3 Water Quality Status ................................................................................................. 40 D-2.3.1 Impaired Waters ................................................................................. 40 D-2.3.2 AB411 Summary ................................................................................. 43 D-2.3.3 Fecal Coliform TMDL Annual Report ............................................. 43 D-2.3.4 Sediment TMDL Annual Report ...................................................... 43 D-2.3.5 Nutrient TMDL Annual Report ....................................................... 44 D-2.4 Priority Water Quality Needs .................................................................................. 44 D-2.4.1 Pollutant Data Gaps ........................................................................... 46 D-2.4.2 Other Data Gaps ................................................................................. 51 D-3.0 TMDLs in the Watershed ........................................................................................................... 53 D-3.1 Existing TMDL Development .................................................................................. 54 D-3.1.1 Newport Bay - Fecal Coliform .......................................................... 54 D-3.1.2 Newport Bay & San Diego Creek – Nutrients ................................ 58 D-3.1.3 Newport Bay & San Diego Creek – Sediment ................................ 60 Proposed 2007 Drainage Area Management Plan D-1 July 2006 Newport Bay Watershed Action Plan APPENDIX D, NEWPORT BAY WATERSHED ACTION PLAN D-3.1.4 Newport Bay & San Diego Creek – Toxics ..................................... 62 D-3.1.5 Ongoing TMDL Studies .................................................................... 68 D-3.2 Status of Future TMDL Development .................................................................... 69 D-4.0 Pollution Source, Control and Treatment Inventories ........................................................... 72 D-4.1 Watershed Pollution Sources ................................................................................... 72 D-4.2 Existing Enhanced Non-Structural BMPs .............................................................. 72 D-4.3 Existing Structural Enhanced BMPs ....................................................................... 73 D-4.3.1 Sediment Trapping Basins ................................................................ 73 D-4.3.2 In-Channel Sediment Basins ............................................................. 73 D-4.3.3 San Joaquin Marsh ............................................................................. 74 D-4.3.4 Newport Dunes Sewer Diversion Project ....................................... 74 D-4.3.5 Serrano Creek Rehabilitation ............................................................ 74 D-4.3.6 Santa Ana Delhi Channel Trash Boom ............................................ 74 D-4.3.7 Warner Channel Nutrient BMP ........................................................ 74 D-4.4 Proposed Structural Enhanced BMPs ..................................................................... 75 D-4.4.1 Natural Treatment System ................................................................ 75 D-4.4.2 Newport Beach storm drain diversion projects ............................. 75 D-4.4.3 Big Canyon Creek Restoration ......................................................... 76 D-4.4.4 El Modena Irvine Channel-Peters Canyon Channel Trash Booms ........................................................................................................... 76 D-4.5 Estimates of Load Reductions of Existing BMPs................................................... 76 D-4.6 Recommendations for BMPs in the Watershed ..................................................... 77 D-5.0 Plan Development ....................................................................................................................... 80 D-6.0 Program Effectiveness Assessment .......................................................................................... 81 D-6.1 Short Term Strategy .................................................................................................. 81 D-6.2 Long-term Strategy .................................................................................................... 82 D-6.3 Review of Management Program ............................................................................ 82 D-7.0 References .................................................................................................................................... 83 Appendix ................................................................................................................................................... 89 Proposed 2007 Drainage Area Management Plan D-2 July 2006 Newport Bay Watershed Action Plan APPENDIX D, NEWPORT BAY WATERSHED ACTION PLAN LIST OF FIGURES Figure D-1 Location Map .................................................................................................................. 10 Figure D-2 Transportation ................................................................................................................ 12 Figure D-3a Unified School Districts................................................................................................. 13 Figure D-3b City Boundaries .............................................................................................................. 14 Figure D-3c Water Providers ............................................................................................................. 15 Figure D-3d Parks & Open Space ...................................................................................................... 16 Figure D-4 Land Use - Existing ........................................................................................................ 17 Figure D-5 Water Quality Planning Process .................................................................................. 24 Figure D-6. Newport Bay Watershed Processes. ............................................................................ 27 Figure D-7 Subwatersheds & Monitoring Locations .................................................................... 33 Figure D-8 Study Type Breakdown ................................................................................................. 38 Figure D-9 Receiving Waters............................................................................................................ 45 LIST OF TABLES Table D-1 Beneficial Uses – Newport Bay Watershed ................................................................ 19 Table D-2 Watershed Management Processes ............................................................................. 25 Table D-3 Assessment #1 - Studies by Program Management Category*. .............................. 36 Table D-4 Study Sources ................................................................................................................. 39 Table D-5 Constituent Focus of Studies and Programs .............................................................. 40 Table D-6 2002 303(d) List and TMDL Priority Schedule – Newport Bay Watershed ........... 42 Table D-7 Monitoring List for Newport Bay Watershed ............................................................ 43 Table