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Flag Run at Elgar Street Stream Restoration Project - May 24, 2017

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The project will restore about 2,900 linear feet of the channel to stabilize the banks and prevent future erosion. A healthy ecosystem will be created by installing native trees and herbaceous plants.

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Flag Run at Elgar Street Stream Restoration Project - May 24, 2017

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Flag Run @ Elgar Street Stream Restoration Project May 2017
  2. 2. Stormwater Planning Division Agenda Social Goals Program Drivers Watershed Environmental Benefits Proposed Stream Alignment Existing Conditions Example Stream Projects Next steps Contact information 2
  3. 3. Stormwater Planning Division Social Goals 1. Maintain open dialog and share information. 2. Coordinate with all the stakeholders and the community. 3. Build partnerships with local organizations such as Homeowners Associations. 4. Design Team:  Stantec Consulting Services  Stormwater Planning Division  Urban Forest Management Division  Park Authority  Wastewater Collection Division  Utilities Design and Construction Division  Virginia Department of Transportation 3
  4. 4. Stormwater Planning Division Stormwater Program Drivers • Municipal Separate Storm Sewer Permit (MS-4) • Chesapeake Bay Total Maximum Daily Loads (TMDL) – Regulates amount of pollutants in waterways (Nitrogen, Phosphorus, and Total Suspended Solids ) • Local TMDLs (sediment, bacteria, and PCBs) • Maintenance of Existing Facilities • Dam Regulations • Public Safety /Emergency Response – Flooding – Snow Removal 4
  5. 5. Accotink Creek Watershed • 52 sq. mi. in Fairfax County. • There are a total of 16 sub- watersheds and 7 major tributaries within the Accotink Creek watershed. • Accotink Creek discharges into Accotink Bay. 5 http://www.fairfaxcounty.gov/dpwes/watersheds/accotinkcreek.htm Stormwater Planning Division
  6. 6. Environmental Benefits Improve watershed conditions and reduce downstream impacts through…. Controlling quantity Mitigate flooding where possible Controlling velocity Reduce erosion Protect infrastructure 6Stormwater Planning Division
  7. 7. Stormwater Planning Division Project Goals Restore up to 3,000 feet of stream in Flag Run Park Stabilize streambed and banks Reduces sediment and nutrient inputs into stream system Improve habitat Protect Infrastructure (sanitary, water, etc.) Maintain close coordination with stakeholders Park Project Clean up  North Springfield Civic Association expressed interest in the removal of invasive species with aid from the County. The Park Authority want to defer until the restoration's completion. DPWES has agreed to remove invasives. 7
  8. 8. Project Area Limits 8Stormwater Planning Division
  9. 9. Stormwater Planning Division Proposed Stream Alignment 9 Juliet Street
  10. 10. Stormwater Planning Division Proposed Stream Alignment 10 Elgar Street Ravensworth Street Construction Entrance
  11. 11. Stormwater Planning Division Proposed Stream Alignment 11 Construction Entrance Elgar Street
  12. 12. Stormwater Planning Division Proposed Stream Alignment 12
  13. 13. Stormwater Planning Division Proposed Stream Alignment 13 495 Potential Construction Entrance off of Dunston St
  14. 14. Stormwater Planning Division Existing Bank Conditions 14
  15. 15. Stormwater Planning Division Culvert and eroded bank by Juliet Street 15
  16. 16. 16 Existing Bank Conditions at Tributary Stormwater Planning Division
  17. 17. Stormwater Planning Division Rain Event June 2013 17
  18. 18. 18 Existing Bank Conditions Erosion undermines tree. Tree becomes unstable and leans. Stormwater Planning Division
  19. 19. 19 Existing Bank Conditions Stormwater Planning Division
  20. 20. Existing Bank Conditions 20
  21. 21. Sanitary Infrastructure 21Stormwater Planning Division Sanitary Sewer Manhole Exposed Sanitary Line
  22. 22. Rendering - before 22
  23. 23. Rendering - after 23
  24. 24. Rendering - before 24
  25. 25. Rendering - after 25
  26. 26. Stormwater Planning Division Typical Structures Used – Cross Vanes 26
  27. 27. Stormwater Planning Division Video of Typical Structures Used 27
  28. 28. Stormwater Planning Division Construction Example 28
  29. 29. Stormwater Planning Division Construction Example 29
  30. 30. Stormwater Planning Division Construction Example 30
  31. 31. Stormwater Planning Division Construction Example 31
  32. 32. Stormwater Planning Division Construction Example 32
  33. 33. Stormwater Planning Division Construction Example 33
  34. 34. Stormwater Planning Division Growing Season Following Construction Completion 34
  35. 35. Stormwater Planning Division One Year After Construction Completion 35
  36. 36. Stormwater Planning Division Three Years After Construction Completion 36
  37. 37. Before and After Examples 37 Banks Park Before After Stormwater Planning Division
  38. 38. 38 Before and After Examples Big Rocky Run II Before After Stormwater Planning Division
  39. 39. 39 Before and After Examples Rabbit Branch Before After Stormwater Planning Division
  40. 40. Stormwater Planning Division Landscaping • Urban forester coordination • Total 526 trees surveyed • 158 trees more than 12” DBH (diameter at breast height) are to be removed – 85 of those trees as potential in-stream habitat features • Each tree to be removed will be evaluated • Native seed mix • Native trees and shrubs will be planted 40
  41. 41. Stormwater Planning Division What’s Next? • Iterative design process – 65 percent, 95 percent and 100 percent design plan submittals with internal reviews – Site walks to validate design and tree removal • Coordination with utility companies • Permits from U.S. Army Corps of Engineers, Department of Environmental Quality, and VDOT • Estimated final plan authorization date: April 2018 41
  42. 42. Stormwater Planning Division Construction Timeline • The bidding process for construction can take approximately 3 months after final authorization of the final plan set • Funds for construction are determined by project readiness and priority for Fiscal Year 2020, and also Board of Supervisors’ approved budget • Construction duration: 12-15 months 42
  43. 43. Online Resources 43 Stormwater Planning Division Website http://www.fairfaxcounty.gov/dpwes/stormwater/ Fairfax County Watershed Planning http://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htm Accotink Creek Watershed Plan http://www.fairfaxcounty.gov/dpwes/watersheds/accotinkcreek.htm EPA Water Quality Laws & Regulations http://www.epa.gov/water/laws.html Stormwater Planning Division
  44. 44. Stormwater Planning Division Contact Information Vivian Bui– Project Manager 703-324-5609 Vivian.Bui@fairfaxcounty.gov Fairfax County Stormwater Planning Division 703-324-5500 TTY 711 12000 Government Center Parkway Suite 449 Fairfax, Virginia 22035 www.fairfaxcounty.gov/dpwes/stormwater To request this information in an alternate format call 703-324-5500, TTY 711 44

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