Saucon Creek Tmdl Alternatives Report
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SAUCON CREEK TMDL ALTERNATIVES REPORT Lehigh Valley Planning Commission February 2011 -1- -2- SAUCON CREEK TMDL ALTERNATIVES REPORT Lehigh Valley Planning Commission in cooperation with Lehigh County Conservation District February 2011 The preparation of this report was financed through a grant agreement with the Pennsylvania Department of Environmental Protection. -3- LEHIGH VALLEY PLANNING COMMISSION Steven L. Glickman, Chair Robert A. Lammi, Vice Chair Kent H. Herman, Treasurer Ron Angle Benjamin F. Howells, Jr. Norman E. Blatt, Jr., Esq. Edward D. Hozza, Jr. Becky Bradley (Alternate) Terry J. Lee Dean N. Browning Ronald W. Lutes John B. Callahan Earl B. Lynn Donald Cunningham Jeffrey D. Manzi John N. Diacogiannis Ross Marcus (Alternate) Percy H. Dougherty Kenneth M. McClain Liesel Dreisbach Thomas J. Nolan Karen Duerholz Ray O’Connell Charles W. Elliott, Esq. Salvatore J. Panto, Jr. Cindy Feinberg (Alternate) Edward Pawlowski Charles L. Fraust Stephen Repasch George F. Gemmel Michael Reph Matthew Glennon Ronald E. Stahley Armand V. Greco John Stoffa Michael C. Hefele (Alternate) Donna Wright Darlene Heller (Alternate) LEHIGH VALLEY PLANNING COMMISSION STAFF Michael N. Kaiser, AICP Executive Director ** Geoffrey A. Reese, P.E. Assistant Director Olev Taremäe Chief Planner Joseph L. Gurinko, AICP Chief Transportation Planner Thomas K. Edinger, AICP GIS Manager/Transportation Planner * Lynette E. Romig Senior GIS Analyst * Susan L. Rockwell Senior Environmental Planner Michael S. Donchez Senior Transportation Planner David P. Berryman Senior Planner Teresa Mackey Senior Planner * Travis I. Bartholomew, EIT Stormwater Planner Wilmer R. Hunsicker, Jr. Senior Planning Technician Bonnie D. Sankovsky GIS Technician Anne L. Esser, MBA Administrative Assistant * Alice J. Lipe Senior Planning Technician Kathleen M. Sauerzopf Secretary **Project Planner *Staff for this report February 2011 -4- TABLE OF CONTENTS Page A. Introduction ..................................................................................................................................1 B. Watershed Description .................................................................................................................1 C. Sediment Impairments .................................................................................................................8 D. Background Data .........................................................................................................................9 E. Sediment Modeling ....................................................................................................................12 F. Reference Watershed Approaches ..............................................................................................14 G. Correlation Procedure ................................................................................................................20 H. Discussion of Correlation Results ..............................................................................................21 I. TMDL Alternatives ....................................................................................................................38 J. References ..................................................................................................................................44 LIST OF TABLES Table Page 1. Saucon Creek Major Tributaries and Drainage Areas ..............................................................4 2. Annual Sediment Loads Calculated in AVGWLF .................................................................13 3. Comparison of Saucon Creek Watershed and Manatawny Creek Study Area.......................14 4. Sediment Loading Rates for Saucon Creek Attaining Locations Using Overall Watershed Sediment Delivery Ratio ......................................................................................18 5. Overall Sediment Loads and Channel Bank Contributions for Saucon Creek Attaining Locations Using Overall Watershed Sediment Delivery Ratio ..............................19 6. Sediment Loading Rates for Saucon Creek Attaining Locations Using Watershed-Specific Sediment Delivery Ratio ........................................................................19 -i- LIST OF TABLES (cont.) Table Page 7. Overall Sediment Loads and Channel Bank Contributions for Saucon Creek Attaining Locations Using Watershed-Specific Sediment Delivery Ratio ............................19 8. Act 167 and FEMA Velocities at LCCD Testing Locations ..................................................24 9. “Typical” Percent Imperviousness by Land Use....................................................................29 10. Summary of Correlation Results and BMP Implications .......................................................41 11. Recommendations for Future Data Collection and Monitoring ............................................43 LIST OF FIGURES Figure Page 1. Saucon Creek Watershed Study Area Location Map ............................................................... 2 2. Saucon Creek Watershed Major Tributaries ............................................................................ 3 3. Saucon Creek Watershed Existing Land Use ........................................................................... 5 4. Saucon Creek Watershed Point Source Discharges ................................................................. 7 5. LCCD Water Quality Sampling Locations ............................................................................ 10 6. Manatawny Creek Study Area Location Map ........................................................................ 15 7. Manatawny Creek Study Area Existing Land Use ................................................................ 16 8. IBI Score vs. Drainage Area .................................................................................................. 21 9. IBI Score vs. % Carbonate Bedrock ...................................................................................... 22 10. IBI Score vs. Channel Bed Slope ........................................................................................... 23 11. Total Habitat Score vs. Sediment Loading Rate divided by FEMA Velocity ........................ 25 12. Critical Habitat Score vs. Sediment Loading Rate divided by FEMA Velocity .................... 25 -ii- LIST OF FIGURES (cont.) Figure Page 13. IBI Score vs. Sediment Loading Rate divided by FEMA Velocity ........................................ 26 14. IBI Score vs. Sediment Deposition Score .............................................................................. 27 15. Epifaunal Substrate Score vs. Annual Sediment Load divided by FEMA Velocity divided by Width divided by Depth ....................................................................................... 27 16. Sediment Deposition Score vs. Annual Sediment Load divided by FEMA Velocity divided by Width divided by Depth ....................................................................................... 28 17. Substrate + Sediment Scores vs. Annual Sediment Load divided by FEMA Velocity divided by Width divided by Depth ....................................................................................... 28 18. IBI Score vs. Percent Impervious Cover ................................................................................ 29 19. IBI Score vs. % Low Density Residential ............................................................................. 31 20. IBI Score vs. % Medium Density Residential ....................................................................... 31 21. IBI Score vs. % High Density Residential ............................................................................. 32 22. IBI Score vs. % Commercial Area ......................................................................................... 32 23. IBI Score vs. % Institutional Area ......................................................................................... 33 24. IBI Score vs. % Medium Density Residential, High Density Residential, Commercial, and Institutional Combined .............................................................................. 33 25. Silver Creek in Silver Creek Country Club (Lower Saucon Township) ................................ 34 26. IBI Score vs. % Golf Course Area ......................................................................................... 34 27. IBI Score vs. Ambient Temperature ....................................................................................... 35 28. IBI Score vs. % Riparian Forest Buffer ................................................................................. 36 29. IBI Score vs. Legacy Sediment Score .................................................................................... 36 30. IBI Score vs. Watershed “Disturbance” ................................................................................. 38 -iii- -iv- SAUCON CREEK TMDL AltERNATIVES REPORT A. INTRODUCTION Since the 1990’s, to satisfy the conditions of the Clean Water Act, Pennsylvania’s Department of Environmental Protection (DEP) has been monitoring the physical, chemical, and biological health of the Waters of the Commonwealth. As part of this process, DEP has been monitoring and testing the streams in the state to determine whether they are meeting their designated uses. These designated uses include aquatic life, fish consumption, potable water supply, and recreation. In accordance with section 303(d) of the Clean Water Act, waters that are not meeting