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Annual NPDES MS4 Report 2020

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Annual NPDES MS4 Report 2020 Annual NPDES MS4 ReportThis page is intentionally left blank. Prepared for: Maryland Department of the Environment Water Management Administration 1800 Washington Boulevard Baltimore, Maryland 21230 Prince George’s County, Department of the Environment 1801 McCormick Drive, Suite 500, Largo, MD 20774 Phone: (301) 883 - 5 9 4 3 Fax: (301) 883 - 9 2 1 8 1 2 / 3 1 / 2 0 2 0 This page is intentionally left blank. National Pollutant Discharge Elimination System Municipal Separate Storm Sewer Systems 2020 Annual Report Prepared for Maryland Department of the Environment Water Management Administration 1800 Washington Boulevard Baltimore, Maryland 21230 This page is intentionally left blank. Prepared by Prince George’s County Government Department of the Environment Stormwater Management Division 1801 McCormick Drive, Suite 500 Largo, Maryland 20774 This page is intentionally left blank. Annual NPDES MS4 Report 2020 EXECUTIVE SUMMARY This report summarizes the activities carried out by various departments and agencies within Prince George’s County in accordance with the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit during fiscal year (FY) 2020, the period of July 2019 through June 2020. This year’s report is a continuation of the major revisions initiated in previous reports. On May 4, 2020, the Maryland Department of the Environment (MDE) provided comments on the County’s 2019 NPDES MS4 annual report. In that transmittal, MDE requested that the responses be provided with the 2020 NPDES MS4 annual report submittal. Accordingly, the County has prepared a list of responses which can be found in Table AA-1 in the “Responses to MDE Comments” section of this report. Where appropriate, the response in the comment table directs the reader to additional details found in the FY 2020 report. In FY 2020, the County vigorously continued its efforts to reduce pollutants entering its waterways in accordance with the objectives of the MS4 permit. These efforts cut across a wide swath of agencies and programs. In FY 2020, the County’s notable accomplishments toward meeting the MS4 goals included: This page is intentionally left blank. Restoration Accomplishments . To date, 2,656 acres of impervious area have been treated and another 3,778 acres were in active planning, design, or construction in FY 2020. Through its Rain Check Rebate Program, 416 BMPs were installed in FY 2020 on private properties, treating 2.27 acres. This program provides great incentives for property owners to minimize stormwater runoff and prevent stormwater pollution in the County waterways, while at the same time providing a great educational platform for the neighborhood residents. Under its Stormwater Stewardship Grant Program, three projects completed treating total 7.12 impervious acres in FY 2020. These projects include on-the-ground efforts such as tree planting and water quality retrofit projects including rain gardens, and bio-retention practices. Illicit Discharge Detection and Elimination Inspections (MS4 Regulated Land) . County inspectors evaluated 151 outfalls in winter/summer 2020 to ascertain the presence of illicit discharges. Of these outfalls, 92 received chemical testing with seven (7) sites recording parameters above pollutant thresholds. Property owners acted to resolve these discharge problems such that all issues were resolved satisfactorily by the end of the reporting period. i Prince George’s County, Department of the Environment | 1801 McCormick Drive, Suite 500, Largo, MD 20774 Annual NPDES MS4 Report 2020 . Regular inspection of 52 commercial and industrial sources identified 20 water quality concerns which the County staff then investigated and worked with property owners to satisfactorily resolve. Litter Control . Trash reduction in the Anacostia watershed included more than 5,000 bags collected and an estimated 96 tons of trash reduced. The County conducted several countywide trash reductions, litter reduction, and recycling programs. Specifically, the County continued several measures, including continuing its Adopt-A-Stream program, using the PGCLitterTRAK mobile app tracking tool, involving communities and municipalities in the Clean Sweep Initiative in the Anacostia watershed, collaborating with the University of Maryland on a litter source reduction study specifically for Prince George’s County, and continuing the County’s trash trap projects. The County’s litter control efforts through comprehensive community cleanup, litter control, and Roadside Clean Ups, Green Up programs removed more than 1,500 tons of trash and debris. Outreach and Education . The County hosted overThis 2 page50 environmental is intentionally education left blank. and outreach events with the help of approximately 400 volunteers to promote environmental awareness, green initiatives, and community involvement in reducing pollutants to its waterways during which nearly 12,000 participants took part. The County’s Tree Planting Program removed 1,339 high-risk or dying trees and planted 7,025 new trees, under its Right Tree, Right Place Program. This provides a net increase of 5,686 new trees planted. Monitoring and Assessment . The County continued its chemical, physical, and biological monitoring and assessment of the Bear Branch watershed. Slight improvements in water quality were noted, this information can be found in Prince George’s County, Maryland—Long-Term Stormwater Monitoring Program —Bear Branch Annual Report 2020, included on the DVD. The County continued in FY 2020 its physical monitoring of the Black Branch watershed to determine the effectiveness of stormwater management practices for stream channel protection. Monitoring results are provided on the DVD. Land Development and SWM Controls . In FY 2020, 187 concept plans for stormwater control were approved. ii Prince George’s County, Department of the Environment | 1801 McCormick Drive, Suite 500, Largo, MD 20774 Annual NPDES MS4 Report 2020 Land Development Inspection Enforcement . The County staff performed 9,701 stormwater construction inspections and 11,698 sediment control inspections. These achievements are further described in this report, with supporting details provided in the MS4 database and the additional documents on the accompanying DVD to this report. This page is intentionally left blank. iii Prince George’s County, Department of the Environment | 1801 McCormick Drive, Suite 500, Largo, MD 20774 This page is intentionally left blank. Annual NPDES MS4 Report 2020 TABLE OF CONTENTS Executive Summary ................................................................................................................................. i Abbreviations ........................................................................................................................................ xi Acknowledgements .............................................................................................................................. xv Introduction .......................................................................................................................................... 17 Part I: Identification .............................................................................................................................. 19 Part II: Definitions ................................................................................................................................. 21 Part III: Water Quality ........................................................................................................................... 23 Part IV: Standard Permit Conditions .................................................................................................... 25 A. Permit Administration ............................................................................................................. 25 B. Legal Authority ........................................................................................................................ 45 C. Source Identification ............................................................................................................... 47 1. Storm Drain System ............................................................................................................ 47 2. Industrial and CommercialThis page Sources is intentionally ................................ left blank..................................................... 47 3. Urban Best Management Practices (BMPs) ........................................................................ 47 4. Impervious Surfaces ............................................................................................................ 48 5. Monitoring Locations .......................................................................................................... 48 6. Water Quality Improvement Projects ................................................................................. 48 D. Management Programs .......................................................................................................... 51 1. Stormwater Management Program .................................................................................... 51 2. Erosion and Sediment Control ............................................................................................ 56 3. Illicit Discharge Detection and Elimination ......................................................................... 57 4. Trash and Litter Program: Anacostia Trash TMDL .............................................................
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