IMPLEMENTATION PLAN FOR VARIOUS TMDLS IN MARYLAND October 9, 2020 MARYLAND DEPARTMENT OF TRANSPORTATION IMPLEMENTATION PLAN FOR STATE HIGHWAY ADMINISTRATION VARIOUS TMDLS IN MARYLAND F7. Gwynns Falls Watershed ............................................ 78 TABLE OF CONTENTS F8. Jones Falls Watershed ............................................... 85 F9. Liberty Reservoir Watershed...................................... 94 Table of Contents ............................................................................... i F10. Loch Raven and Prettyboy Reservoirs Watersheds .. 102 Implementation Plan for Various TMDLS in Maryland .................... 1 F11. Lower Monocacy River Watershed ........................... 116 A. Water Quality Standards and Designated Uses ....................... 1 F12. Patuxent River Lower Watershed ............................. 125 B. Watershed Assessment Coordination ...................................... 3 F13. Magothy River Watershed ........................................ 134 C. Visual Inspections Targeting MDOT SHA ROW ....................... 4 F14. Mattawoman Creek Watershed ................................. 141 D. Benchmarks and Detailed Costs .............................................. 5 F15. Piscataway Creek Watershed ................................... 150 E. Pollution Reduction Strategies ................................................. 7 F16. Rock Creek Watershed ............................................. 158 E.1. MDOT SHA TMDL Responsibilities .............................. 7 F17. Triadelphia and Rocky Gorge Reservoirs Watersheds 166 E.2. Nutrients and Sediment Pollution Reduction Strategy 19 F18. Severn River Watershed ........................................... 177 E.2.a. Nutrients and Sediment TMDLs Affecting MDOT F19. South River Watershed ............................................. 186 SHA ............................................................... 19 F20. Upper Monocacy River Watershed ........................... 197 E.2.b. Nutrient and Sediment Sources ...................... 19 F21. Other West Chesapeake Watershed ......................... 204 E.2.c. Nutrient and Sediment Reduction Strategies .. 20 F22. West River Watershed .............................................. 212 E.3 Bacteria Pollution Reduction Strategy………………….22 F23. Port Tobacco River Watershed ................................. 220 E.2.a. Bacteria TMDLs Affecting MDOT SHA ........... 22 E.2.b. Bacteria Sources............................................. 23 Optional Worksheets for MS4 Stormwater WLA Implementation E.2.c. Bacteria Reduction Strategies ........................ 25 Planning Spreadsheet ................................................................... O-1 F. Various TMDLs Implementation Plans Abbreviations ................................................................................. A-1 F1. Anacostia River Watershed ........................................ 26 F2. Antietam Creek Watershed ......................................... 38 References ..................................................................................... R-1 F3. Non-Tidal Back River Watershed ................................ 47 F4. Cabin John Creek Watershed ..................................... 56 F5. Conococheague Creek Watershed ............................. 63 F6. Double Pipe Creek Watershed ................................... 70 10/09/2020 Page i MARYLAND DEPARTMENT OF TRANSPORTATION IMPLEMENTATION PLAN FOR STATE HIGHWAY ADMINISTRATION VARIOUS TMDLS IN MARYLAND IMPLEMENTATION PLAN FOR Table 1: Designated Uses in Maryland VARIOUS TMDLS IN MARYLAND Use Classes Designated Uses I I-P II II-P III III-P IV IV-P Growth and Propagation A. WATER QUALITY STANDARDS of Fish (not trout), other AND DESIGNATED USES aquatic life and wildlife Water Contact Sports Leisure activities Total Maximum Daily Loads (TMDLs) focus on offsetting the impacts of involving direct contact pollutants to waterway designated uses. The Federal Clean Water Act with surface water (CWA) established requirements for each state to develop programs to Fishing Agricultural Water address water pollution including: Supply Industrial Water Supply • Establishment of water quality standards (WQSs); Propagation and • Implementation of water quality monitoring programs; Harvesting of Shellfish Seasonal Migratory Fish • Identification and reporting of impaired waters; and Spawning and Nursery Use • Development of maximum allowable pollutant loads that when Seasonal Shallow-water Submerged Aquatic met and not exceeded will restore WQSs to impaired waters, Vegetation Use called TMDL documents. Open-Water Fish and Shellfish Use WQSs are based on the concept of designating and maintaining Seasonal Deep-Water Fish and Shellfish Use specifically defined uses for each waterbody. Table 1 lists the Seasonal Deep-Channel designated uses for waterways in the State of Maryland. TMDLs are Refuge Use based on these uses. Growth and Propagation of Trout Capable of Supporting One means for the United States Environmental Protection Agency Adult Trout for a Put and (EPA) to enforce these standards is through the National Pollutant Take Fishery Discharge Elimination System (NPDES) program, which regulates Public Water Supply discharges from point sources. The Maryland Department of the Source: Environment (MDE) is the delegated authority to issue NPDES http://www.mde.maryland.gov/programs/water/TMDL/WaterQualitySt discharge permits within Maryland and to develop WQSs for Maryland andards/Pages/wqs_designated_uses.aspx including the water quality criteria that define the parameters to ensure designated uses are met. 10/09/2020 Page 1 MARYLAND DEPARTMENT OF TRANSPORTATION IMPLEMENTATION PLAN FOR STATE HIGHWAY ADMINISTRATION VARIOUS TMDLS IN MARYLAND MS4 Permit Requirements Coordinated TMDL Implementation Plans (Permit Part IV.E.2.b.) The Maryland Department of Transportation State Highway Administration (MDOT SHA) Municipal Separate Storm Sewer System Within one year of permit issuance, a coordinated TMDL (MS4) Permit requires coordination with county MS4 jurisdictions implementation plan shall be submitted to MDE for approval that concerning watershed assessments and development of a coordinated addresses all EPA approved stormwater WLAs (prior to the TMDL implementation plan for each watershed that MDOT SHA has a effective date of the permit) and requirements of Part VI.A., wasteload allocation (WLA). Requirements from the MDOT SHA MS4 Chesapeake Bay Restoration by 2025 for SHA's storm sewer Permit specific to watershed assessments and coordinated TMDL system. Both specific WLAs and aggregate WLAs which SHA is implementation plans include Part IV.E.1. and Part IV.E.2.b., copied a part of shall be addressed in the TMDL implementation plans. below. Any subsequent stormwater WLAs for SHA's storm sewer system shall be addressed by the coordinated TMDL implementation plan Watershed Assessments (Permit Part IV.E.1.) within one year of EPA approval. Upon approval by MDE, this implementation plan will be enforceable under this permit. As part SHA shall coordinate watershed assessments with surrounding of the coordinated TMDL implementation plan, SHA shall: jurisdictions, which shall include, but not be limited to the • evaluation of available State and county watershed assessments, Include the final date for meeting applicable WLAs and a SHA data, visual watershed inspections targeting SHA rights-of- detailed schedule for implementing all structural and way and facilities, and approved stormwater WLAs to: nonstructural water quality improvement projects, enhanced stormwater management programs, and alternative • Determine current water quality conditions; stormwater control initiatives necessary for meeting • Include the results of visual inspections targeting SHA applicable WLAs; rights-of-way and facilities conducted in areas identified as • Provide detailed cost estimates for individual projects, priority for restoration; programs, controls, and plan implementation; • Identify and rank water quality problems for restoration • Evaluate and track the implementation of the coordinated associated with SHA rights-of-way and facilities; implementation plan through monitoring or modeling to • Using the watershed assessments established under document the progress toward meeting established section a. above to achieve water quality goals by identifying benchmarks, deadlines, and stormwater WLAs; and all structural and nonstructural water quality improvement • Develop an ongoing, iterative process that continuously projects to be implemented; and implements structural and nonstructural restoration projects, • Specify pollutant load reduction benchmarks and deadlines program enhancements, new and additional programs, and that demonstrate progress toward meeting all applicable alternative BMPs where EPA approved TMDL stormwater stormwater WLAs. WLAs are not being met according to the benchmarks and deadlines established as part of the SHA's watershed assessments. 10/09/2020 Page 2 MARYLAND DEPARTMENT OF TRANSPORTATION IMPLEMENTATION PLAN FOR STATE HIGHWAY ADMINISTRATION VARIOUS TMDLS IN MARYLAND B. WATERSHED ASSESSMENT COORDINATION According to the United States Geological Survey (USGS) (2016): A watershed is an area of land that drains all the streams and rainfall to a common outlet such as the outflow of a reservoir, mouth of a bay, or any point along a stream channel. The word watershed is sometimes used interchangeably