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Draft Water Quality Assesment 2020 Integrated Report

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Draft Water Quality Assesment 2020 Integrated Report DRAFT DISTRICT OF COLUMBIA WATER QUALITY ASSESSMENT 2020 INTEGRATED REPORT TO THE US ENVIRONMENTAL PROTECTION AGENCY AND CONGRESS PURSUANT TO SECTIONS 305(b) AND 303(d) CLEAN WATER ACT (P.L. 97-117) Preface The Department of Energy and Environment (DOEE) prepared this report to satisfy the listing requirements of §303(d) and the reporting requirements of §305(b) of the federal Clean Water Act (CWA) (P.L. 97-117). This report provides water quality information for the District of Columbia’s surface waters and groundwaters that were assessed during 2018 and 2019 and updates the water quality information required by law. The US Environmental Protection Agency’s new Assessment, Total Maximum Daily Load (TMDL) Tracking and Implementation System (ATTAINS) database holds the official submittal of the CWA §303(d) list and §305(b) assessed waters information and contains more detailed information on the District’s waterbody segments. The ATTAINS database can be viewed on the US Environmental Protection Agency website at https://ofmpub.epa.gov/waters10/attains_index.home. The following DOEE divisions contributed to this report: Air Quality, Fisheries and Wildlife, Inspection and Enforcement, Regulatory Review, Toxic Substances, Watershed Protection, and Water Quality. i Contents List of Figures iv List of Tables v Acronyms /Abbreviations ............................................................................................................ vi Chapter 1 Executive Summary ......................................................................................... 1 1.1 Introduction ...................................................................................................................... 1 1.2 District of Columbia Water Quality ................................................................................. 1 1.3 Causes and Sources of Water Quality Impairment .......................................................... 1 1.4 Conclusions ...................................................................................................................... 3 Chapter 2 Background ...................................................................................................... 5 2.1 Atlas, Total Waters, and Maps ......................................................................................... 5 2.2 Water Pollution Control Programs................................................................................... 8 2.3 Point Source Program .................................................................................................... 10 2.4 Compliance Inspections ................................................................................................. 13 2.5 Watershed Protection Division Enforcement Programs ................................................ 15 2.6 Municipal Separate Storm Sewer System Permit .......................................................... 16 2.7 Wetlands Protection ....................................................................................................... 17 2.8 Nonpoint Source Control Program ................................................................................ 21 2.9 Section 2.7.1 BMP Implementation ............................................................................... 21 2.10 Stream Restoration Updates ........................................................................................... 23 2.11 Stormwater Pollution and Runoff Reduction ................................................................. 26 2.12 Environmental Education and Outreach ........................................................................ 33 2.13 Job Training Programs ................................................................................................... 36 2.14 Cost/Benefit Assessment ............................................................................................... 37 2.15 Benefits .......................................................................................................................... 43 Chapter 3 Surface Water Assessment ............................................................................ 45 3.1 Background .................................................................................................................... 45 3.2 Use Support Determination............................................................................................ 46 3.3 Waterbody Segments Water Quality Assessment.......................................................... 51 3.4 Relative Assessment of Causes/Stressors ...................................................................... 52 3.5 Relative Assessment of Sources .................................................................................... 54 3.6 Special Topics ................................................................................................................ 55 3.7 Long-Term Vision for Assessment, Restoration, and Protection under the Clean Water Act Section 303(d) Program (Section 303(d) “New Vision”) ....................................... 59 ii Chapter 4 Public Health Related Assessments.............................................................. 77 Chapter 5 Groundwater Assessment ............................................................................. 81 5.1 Groundwater Protection ................................................................................................. 81 5.2 Groundwater Evaluation ................................................................................................ 87 Appendix 2.1 Major District of Columbia Watersheds ..................................................... 92 Appendix 3.1 2020 Use Support and Cause by Pollutant .................................................. 93 Appendix 3.2 Real Time Monitoring Stations .................................................................. 107 Appendix 3.3 2015-2019 Statistical Summary Reports ................................................... 111 Appendix 3.4 District of Columbia 303(d) List................................................................. 122 Appendix 3.5 303(d) Program New Vision: Stakeholders Engagement Strategy and Prioritization Strategy ................................................................................ 159 Appendix 5.1 Groundwater Monitoring Wells ................................................................. 203 Appendix 5.2 Map of Groundwater Monitoring Network .............................................. 205 Appendix 5.3 Groundwater Quality Data ......................................................................... 207 Appendix 5.4 Water Level Measurements for Monitoring Wells ................................... 229 Appendix 5.5 Major Sources of Groundwater Contamination ...................................... 241 Appendix 5.6 Groundwater Protection Programs ........................................................... 243 Appendix 5.7 Shallow Aquifer Contamination................................................................. 245 Definitions 247 Bibliography 251 iii List of Figures Figure 2.1 Total monthly, yearly, and normal total rainfall (inches), 2018–2019 (Source: National Weather Service, Ronald Reagan Washington National Airport). .................................. 6 Figure 2.2 Monthly and yearly average flow on the Anacostia River, 2018–2019. ....................... 7 Figure 2.3 Monthly and yearly average flow on the Potomac River, 2018–2019. ......................... 8 Figure 2.4 Map of stormwater and wastewater treatment service areas. ...................................... 38 Figure 2.5 Map of MS4 sewershed coverage area. ....................................................................... 41 Figure 3.1 SAV abundance by year. ............................................................................................. 66 Figure 3.2 Biomass (g/rep) at Buzzards Point/James Creek site, from May-November, 2013- 2019............................................................................................................................................... 68 Figure 3.3 Trash Capture by the Hickey Run BMP from April 2017 through June 2019. ........... 72 Figure 3.4 Sediment Removal from the Hickey Run BMP from March 2017 through September 2019............................................................................................................................................... 73 Figure 5.1 (Left) LiDAR elevation map of Washington D.C. and the paleochannels found in the current joint USGS-DOEE study (arrows pointing downriver). (Right) Structure contour map of base of Quaternary sediments showing numerous paleochannels and locations of proposed faults (red dashed lines) and documented fault (solid red line). ............................................................. 86 Figure 5.2 Map of the thickness of the Quaternary deposits beneath downtown Washington D.C. Thicker areas are sandy infillings of paleochannels and are groundwater reservoirs and conduits. The locations of most springs coincide with steep gradients where younger channel erosion cuts into older paleochannel deposits. .................................................................................................. 87 Figure 5.3 Groundwater Model and its Use for Dewatering Permits and Evaluation. ................. 89 Figure 5.4 Tidal Anacostia River Groundwater Model Conceptual Site Model. ......................... 90 Figure 5.5 Tidal Anacostia River Model Results.........................................................................
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