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Appoquinimink Watershed Implementation Plan

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Appoquinimink Watershed Implementation Plan Appoquinimink Watershed Implementation Plan Final Report 4/11/05 Prepared for Delaware Department of Natural Resources and Environmental Control 820 Silver Lake Blvd., Suite 220 Dover, DE 19904 New Castle Conservation District 2430 Old County Road Newark, Delaware 19702 Prepared by Center for Watershed Protection 8390 Main St, 2nd Floor Ellicott City, MD 21043 Acknowledgments We would like to thank Kathy-Bunting Howarth and Lyle Jones with the DNREC Watershed Assessment Section, and Cortney Worrall, the former Appoquinimink Watershed Coordinator for their support and coordination assistance on this project. In her new role as Watershed Coordinator and Director of the Appoquinimink River Association, Sara Wozniak provided field assistance and pertinent local knowledge throughout the course of the project, and we wish her the very best in her implementation endeavors. We appreciate the sharing of GIS and relevant watershed information from Steve Williams (DE Whole Basin Program), Jennifer Jennings (DNREC), and Jerry Kauffman and Kevin Vonck (DE Water Resource Agency). Additionally, we would like to thank Mike Krumrine and Jessica Lister (DNREC), along with Alexander Maestre (University of Alabama), for their assistance in conducting stream and upland assessments. We would also like to thank Wendy Polasko (DelDOT) and Saurabh Srivastava (NCC) for joining us in the field during the retrofit inventory. Rae Teal and Morris Deputy with the Town of Middletown provided site plans and copies of local subdivision regulations, and Chris Heckscher and Mark Biddle (DNREC) supplied information on natural resources. We would also like to extend our thanks to faculty and staff at St. Andrews, as well as other watershed residents and businesses for tolerating our field crews and sharing information on local concerns and conditions that we would not have otherwise known. You have a wonderful resource in the Appoquinimink River, and we commend you for your commitment to watershed protection and restoration efforts. Primary CWP staff involved in producing this report includes Ted Brown, Sally Hoyt, Anne Kitchell, Paul Sturm, and Tiffany Wright. Additional CWP staff included Viswa Apavou, Jessica Brooks, Neely Law, Stephanie Sprinkle, and Angie Temple. Appoquinimink Urban Pollution Control Strategy Implementation Plan Table of Contents Page List of Tables .........................................................................................................................iv List of Figures and Maps .......................................................................................................v Executive Summary ..............................................................................................................vii Section 1.0 Introduction.........................................................................................................1 1.1 Background.................................................................................................1 1.2 Report Organization....................................................................................2 1.3 Caveats........................................................................................................3 Section 2.0 Watershed Goals and Recommendations ...........................................................5 2.1 Appoquinimink Pollution Control Strategy Goals......................................5 2.2 Implementation Recommendations ............................................................7 Section 3.0 Management Practices ........................................................................................13 3.1 Watershed Protection Practices...................................................................14 3.2 Stormwater Retrofits ...................................................................................18 3.3 Stream Corridor Restoration .......................................................................18 3.4 Discharge Prevention ..................................................................................20 3.5 Pervious Area Restoration...........................................................................21 3.6 Pollution Prevention and Source Control Education...................................22 3.7 Municipal Practices and Programs ..............................................................23 Section 4.0 Subwatershed Management Strategies ..............................................................25 4.1 Appoquinimink Mainstem...........................................................................27 4.2 Deep Creek..................................................................................................33 4.3 Dove Nest....................................................................................................45 4.4 Drawyer Creek............................................................................................59 4.5 Hangman’s Run...........................................................................................65 4.6 Noxontown Pond.........................................................................................71 Section 5.0 Costs and Schedules............................................................................................83 5.1 Estimating Costs.........................................................................................83 5.2 Implementation Schedule............................................................................87 Section 6.0 Appoquinimink Monitoring Plan........................................................................89 6.1 Project Monitoring (Performance Monitoring)...........................................92 6.2 Sentinel Stations..........................................................................................92 6.3 Illicit Discharge Monitoring .......................................................................93 6.4 Project Tracking..........................................................................................94 6.5 Data Reporting............................................................................................95 References..............................................................................................................................96 iii Appoquinimink Urban Pollution Control Strategy Implementation Plan List of Appendices Appendix A. Priority Stormwater Retrofits...........................................................................A-1 Appendix B. Stream Stabilization Supplemental Material....................................................B-1 Appendix C. Source Control Supplemental Material ............................................................C-1 Appendix D. Subwatershed Management Maps....................................................................D-1 List of Tables Table Page Table E-1. High Priority Stormwater Retrofits......................................................................ix Table E-2. High Priority Stream Restoration Projects...........................................................x Table E-3. High Priority Pollution Source Control Projects..................................................xi Table E-4. High Priority Enforcement and Discharge Investigation.....................................xi Table E-5. Implementation Costs and Schedule...................................................................xiii Table 1 . Urban Management Practices Recommended for the Appoquinimink ..................13 Table 2. BSD strategies for Appoquinimink Subwatersheds.................................................16 Table 3. Types of Discharges.................................................................................................20 Table 4. Appoquinimink Subwatershed Characteristics.......................................................26 Table 5. Appoquinimink Mainstem Characteristics .............................................................27 Table 6. Restoration Opportunities Identified in Appoquinimink Mainstem........................30 Table 7. Deep Creek Subwatershed Characteristics .............................................................33 Table 8. Restoration Opportunities Identified in Deep Creek ...............................................36 Table 9. Dove Nest Branch Subwatershed Characteristics...................................................45 Table 10. Restoration Opportunities Identified in Dove Nest Branch...................................48 Table 11. Drawyer Creek Subwatershed Characteristics......................................................59 Table 12. Restoration Opportunities Identified in Drawyer Creek........................................61 Table 13. Hangman’s Run Subwatershed Characteristics ....................................................65 Table 14. Restoration Opportunities Identified in Hangman’s Run ......................................67 Table 15. Noxontown Subwatershed Characteristics ...........................................................71 Table 16. Restoration Opportunities Identified in Noxontown Pond ....................................73 Table 17. High Priority Stormwater Retrofits........................................................................84 Table 18. High Priority Stream Repair and Buffer Reforestation Projects............................85 Table 19. Costs and Schedule for Recommendation and Priority Project Implementation...88 Table 20. Components of a Monitoring Plan for Appoquinimink.........................................90 iv Appoquinimink Urban Pollution
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