Chester River and Choptank River Watershed Management Plan Final Plan November 2014 Prepared for: Department of Natural Resources and Environmental Control (DNREC) Prepared by: KCI Technologies, Inc. 1352 Marrows Road Suite 100 Newark, DE 19711 Chester River and Choptank River Watershed Management Plan Final Plan November 2014 Prepared for: Department of Natural Resources and Environmental Control (DNREC) Prepared by: KCI Technologies, Inc. 1352 Marrows Road Suite 100 Newark, DE 19711 KCI Job Order No. 17133560 Chester River and Choptank River Watershed Management Plan 2014 Table of Contents 1 Introduction ................................................................................................................... 5 1.1 Goals and Objectives ..................................................................................................................... 6 1.2 Regulatory and Programmatic Environment ................................................................................ 7 1.3 Watershed Priorities ..................................................................................................................... 8 2 Watershed Characteristics.............................................................................................. 8 2.1 Watershed Delineation and Planning Segments .......................................................................... 8 2.2 Chester and Choptank ................................................................................................................. 11 2.2.1 Chester River ....................................................................................................................... 11 2.2.2 Choptank River .................................................................................................................... 11 2.3 Land Use ...................................................................................................................................... 13 2.3.1 Existing Land Use ................................................................................................................ 13 2.3.2 Imperviousness ................................................................................................................... 13 2.4 Water Quality .............................................................................................................................. 23 2.4.1 Use Designations ................................................................................................................. 23 2.4.2 303(d) Impairments ............................................................................................................ 23 2.4.3 TMDLs ................................................................................................................................. 23 2.4.4 NPDES .................................................................................................................................. 24 2.5 Anticipated Growth ..................................................................................................................... 24 3 Causes and Sources of Impairment (a) .......................................................................... 25 3.1 Nutrients ..................................................................................................................................... 27 3.2 Bacteria ....................................................................................................................................... 28 3.3 Sources ........................................................................................................................................ 29 3.3.1 Wastewater ......................................................................................................................... 29 3.3.2 Urban .................................................................................................................................. 29 3.3.3 Agriculture........................................................................................................................... 29 3.3.4 Septic ................................................................................................................................... 29 3.3.5 Forest .................................................................................................................................. 29 3.4 Summary ..................................................................................................................................... 29 4 Expected Load Reductions (b) ....................................................................................... 29 4.1 Nutrients ..................................................................................................................................... 29 4.2 Bacteria ....................................................................................................................................... 33 5 Management Measures (c) ........................................................................................... 33 5.1 Nutrients ..................................................................................................................................... 35 5.1.1 Wastewater ......................................................................................................................... 35 5.1.2 Urban .................................................................................................................................. 35 5.1.3 Agriculture........................................................................................................................... 38 5.1.4 Septic ................................................................................................................................... 43 5.1.5 Forest .................................................................................................................................. 44 5.2 Bacteria ....................................................................................................................................... 44 i DNREC Chester River and Choptank River Watershed Management Plan 2014 5.3 Offsetting Nutrient and Sediment Loads from Future Growth .................................................. 45 5.3.1 Statewide Stormwater Regulations .................................................................................... 45 5.3.2 Establish in-lieu fee for stormwater impacts ...................................................................... 45 5.3.3 Establish a statewide program that provides additional flexibility for offsets ................... 46 5.3.4 Adaptive management ........................................................................................................ 46 5.4 Summary ..................................................................................................................................... 46 6 Technical and Financial Assistance Needs (d) ................................................................ 47 6.1 Wastewater ................................................................................................................................. 48 6.2 Urban .......................................................................................................................................... 48 6.3 Agriculture .................................................................................................................................. 49 6.4 Septic ........................................................................................................................................... 50 6.5 Forest .......................................................................................................................................... 51 6.6 Funding Sources .......................................................................................................................... 51 7 Public Participation / Education (e) .............................................................................. 52 8 Implementation Schedule and Milestones (f & g) ......................................................... 55 8.1 Loading Allocations and Milestone Targets ................................................................................ 55 8.2 Implementation Milestones ........................................................................................................ 56 8.3 Implementation Priorities ........................................................................................................... 58 9 Load Reduction Evaluation Criteria (h) .......................................................................... 59 9.1 Watershed Plan Tracker .............................................................................................................. 60 10 Monitoring (i) .............................................................................................................. 60 11 References ................................................................................................................... 62 List of Tables Table 1: TMDLs used for Pollutant Targets for Chester River and Choptank River Watersheds .................. 6 Table 2: Chester and Choptank Watershed Drainage Area and Stream Miles ........................................... 11 Table 3: 2010 Chester and Choptank Land Use .......................................................................................... 13 Table 4: Use Designations of the Chester River and Choptank River