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Christina River Basin High-Flow TMDL
Christina River Basin High-Flow TMDL Revisions
EPA revised the existing Total Maximum Daily Loads (TMDLs) for the Christina River watershed, which includes Brandywine Creek, Red Clay Creek, and White Clay Creek in Delaware and Pennsylvania. These revisions were made to the Christina River Basin low-flow nutrient/dissolved oxygen TMDLs, high flow nutrient/DO TMDLs, and high-flow bacteria TMDLs, in light of factors such as the availability of recent data and review of the computer model used to develop the original TMDLs.
Revisions to High-Flow Nutrient/ Low DO TMDL for Christina River Basin, Pennsylvania, Delaware, and Maryland
2006 State of Delaware Approval letter [PDF, 2 Pages, 27 kb, About PDF]
2006 State of Maryland Approval letter [PDF, 2 Pages, 23 kb, About PDF]
2006 State of Pennsylvania Approval letter [PDF, 2 Pages, 23 kb, About PDF]
Christina Nutrient/ DO TMDL Report
- Cover Page Table of Contents, Errata
4/30/2007 [PDF, 12 Pages , 232 kb, About PDF]
- Section 1. Introduction [PDF, 12 Pages , 235 kb, About PDF]
- Section 2. Source Assessment [PDF, 14 Pages , 898 kb, About PDF]
- Section 3. Endpoint Determination [PDF, 3 Pages , 371 kb, About PDF]
- Section 4. Methodology and Calculation,
Errata
4/30/2007 [PDF, 15 Pages , 462 kb, About PDF]
- Section 5. Reasonable Assurance and Implementation [PDF, 2 Pages , 24 kb, About PDF]
- Section 6. Public Participation [PDF, 2 Pages , 19 kb, About PDF]
- Section 7. References [PDF, 2 Pages , 24 kb, About PDF]
Appendices
- Appendix A. Pennsylvania’s Stormwater Management Policy [PDF, 16 Pages , 1616 kb, About PDF]
- Appendix B. EPA Memorandum on WLA for Stormwater Sources [PDF, 8 Pages , 32 kb, About PDF]
- Appendix C. Land Use Areas, MS4 Allocations [PDF, 16 Pages , 151 kb, About PDF]
- Appendix D. EFDC Baseline and Allocation Results [PDF, 28 Pages , 517 kb, About PDF]
- Appendix E. Wilmington Volumes and Loads [PDF, 7 Pages , 192 kb, About PDF]
- Appendix F. Tables from 2005 TMDL Report [PDF, 6 Pages , 155 kb, About PDF]
Model Report (Updated) for Christina River Basin, Pennsylvania, Delaware and Maryland, High-Flow Nutrient and Low DO TMDL Development
- Section 00 - Table of Contents [PDF, 4 pages, 36K, About PDF]
- Section 1 - Introduction [PDF, 4 pages, 144K, About PDF]
- Section 2 - Watershed Loading Models [PDF, 12 pages, 236K, About PDF]
- Section 3 - EFDC Hydrodynamic Model [PDF, 10 pages, 42K, About PDF]
- Section 4 - EFDC Water Quality Model [PDF, 36 pages, 1M, About PDF]
- Section 5 - EFDC Sediment Process Model [PDF, 22pages, 727K, About PDF]
- Section 6 - EFDC Water Quality Model Calibration [PDF, 14 pages, 286K, About PDF]
- Section 7 - References [PDF, 6 pages, 37K, About PDF]
Appendices
- Appendix A - EFDC Water Quality Model Calibration
Model-Data Time-Series Comparison Graphics [PDF, 2 pages, 340K, About PDF]
- Appendix B - Summary of Wilmington CSO Baseline and TMDL Volumes and Nutrient Loads
[PDF, 2 pages, 82K, About PDF]
- Appendix C - Miscellaneous Information [PDF, 7 pages, 411K, About PDF]
- Appendix D - Listing of Input Data Files for EFDC 1994-1998 Calibration Run [PDF, 63 pages, 2M, About PDF]
Revision to High-Flow Bacteria and Sediment TMDL for Christina River Basin, Pennsylvania, Delaware, and Maryland
[Note: no revisions were made to the sediment TMDLs]
2006 State of Delaware Approval letter [PDF, 2 Pages, 33 kb, About PDF]
2006 State of Maryland Approval letter [PDF, 2 Pages, 29 kb, About PDF]
2006 State of Pennsylvania Approval letter [PDF, 2 Pages, 23 kb, About PDF]
Christina Bacteria and Sediment TMDL Report 2006
-
Cover Page, Table of Contents & Executive Summary [PDF, 16 Pages, 146 kb, About PDF]
- Section 1- Introduction [PDF, 13 Pages, 234 kb, About PDF]
- Section 2- Source Assessment [PDF, 17 Pages, 1,009 kb, About PDF]
- Section 3- Endpoint Determination [PDF, 6 Pages, 133 kb, About PDF]
- Section 4- Methodology and Calculation [PDF, 17 Pages, 532 kb, About PDF]
- Section 5- Reasonable Assurance and Implementation [PDF, 3 Pages, 28 kb, About PDF]
- Section 6- Public Participation [PDF, 1 Page, 18 kb, About PDF]
- Section 7- References [PDF, 2 Pages, 24 kb, About PDF]
Appendices
- Appendix A - Pennsylvania Comprehensive Stormwater Management Policy [PDF, 16 Pages, 1,616 kb, About PDF]
- Appendix B - EPA Guidance on TMDLs, WLAs, and Storm Water Discharges (MS4) [PDF, 8 Pages, 32 kb, About PDF]
- Appendix C - Land Use Areas, MS4 Allocations [PDF, 19 pages, 658 kb, About PDF]
- Appendix D - Revisions to April 2005 Bacteria TMDL [PDF, 14 Pages, 229 kb, About PDF]
- Appendix E - Tables from 2005 Report being revised [PDF, 3 Pages, 20 kb, About PDF]
- Appendix F -
TMDLs, WLAs and LAs in Units per Day [PDF, 7 Pages, 122 kb, About PDF]
Model Report for Christina River Basin, Pennsylvania, Delaware, and Maryland, Bacteria and Sediment TMDL Development
Model Report [PDF, 49 Pages, 1,677 kb, About PDF]
Appendices
- Appendix A to N [PDF, 6 Pages, 2,516 kb, About PDF]
- Appendix O. Wilmington CSO Baseline and Average Annual Flow and Loads [PDF, 3 Pages, 18 kb, About PDF]
