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Pike Branch at Wilton Road Stream Stabilization Project

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Pike Branch at Wilton Road Stream Stabilization Project

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Pike Branch at Wilton Road Stream Stabilization Project

  1. 1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Pike Branch at Wilton Road Stream Stabilization Project January 2017
  2. 2. Stormwater Planning Division Agenda Program Drivers Watershed Project Objectives Social Goals Project History Existing Conditions Stream Retaining Walls Proposed Stream Stabilization Concept Next steps Contact information 2
  3. 3. Stormwater Planning Division Stormwater Program Regulatory Drivers • National Pollutant Discharge Elimination System (NPDES) • Virginia Stormwater Management Program (VSMP) – Municipal Separate Storm Sewer Permit (MS4) – Discharge from approximately 7,000 storm drain outfalls – Includes watershed planning and project implementation • Total Maximum Daily Loads (TMDLs) – Chesapeake Bay – Local Streams – Establishes pollutant loading budget for a given impaired water body to meet water quality standards 3
  4. 4. Cameron Run Watershed • 33 sq. mi. in Fairfax County • 95% of watershed is developed with a majority of development occurring before implementation of modern stormwater facilities 4 http://www.fairfaxcounty.gov/dpwes/watersheds/cameronrun.htm Stormwater Planning Division
  5. 5. Stormwater Planning Division Project Objectives Stabilize up to 1,300 feet of stream along Pike Branch, from Telegraph Road to Wilton Road Better watershed conditions and reduce downstream impacts through…  Controlling quantity and mitigate flooding where possible  Controlling velocity to reduce erosion and protect infrastructure Create in-stream and riparian habitat for wildlife Improve water quality through the removal of phosphorus, nitrogen, and total suspended solids 5
  6. 6. Stormwater Planning Division Social Goals 1. Maintain open dialogue and share information. 2. Coordinate with all the stakeholders and the community. 3. Design Team: o Rinker Design Associates, P.C. o ECS Mid-Atlantic, LLC o Utilities Design and Construction Division o Stormwater Management o Stormwater Planning Division o Maintenance and Stormwater Management Division o Urban Forest Management Division 6
  7. 7. Stormwater Planning Division Stream Stabilization Timeline 7 1. 1981- Pike Branch Channel Improvements project completed 2. 1982- Storms cause sections of the new gabion walls to fail 3. 1983- Engineering study conducted to determine corrective actions 4. 1983-2007 Various minor maintenance repairs to the channel 5. 2008- Pike Branch Phase I emergency repair
  8. 8. Stormwater Planning Division Stream Stabilization Timeline 8 6. 2012- Stream assessment identified 6015 Telegraph Road and 6016 Pike Branch Drive as the most critical areas along this section of Pike Branch requiring stabilization and identified actions to repair wall 7. February 2013- County constructed a road to the stream to provide access for geotechnical borings and future maintenance construction 8. July 2013- Preliminary geotechnical engineering analysis of Pike Branch completed 9. September 2015- To minimize liability and risk during construction, Fairfax County purchased 6015 Telegraph Road 10.May 2016- County demolished the house 11.September 2016- RDA, the design consultant, completed a more detailed stream assessment to determine the stream stabilization potential of Pike Branch, increasing the project area from Telegraph Road to Wilton Road 12.November 2016- ECS, the geotechnical consultant, completed a retaining wall assessment and a draft geotechnical report of the stream reach. 13.December 2016- RDA finished the stream stabilization concept
  9. 9. Project Area Limits 9 Wilton Road Telegraph Road Pike Road Pike Branch Drive Approximate limits of disturbance Stormwater Planning Division Old Telegraph Road
  10. 10. Stormwater Easements 10Stormwater Planning Division Storm Sewer and Storm Drainage Easement Floodplain and Storm Drainage Easement Chesapeake Bay Resource Protection Area (RPA) FEMA 100-Year Floodplain (Zone A) Floodplain Easement
  11. 11. Stormwater Planning Division Existing Conditions 11 Pike Branch at Wilton Road Story Map
  12. 12. Stormwater Planning Division Existing Conditions 12
  13. 13. Stormwater Planning Division Stream Stabilization- Typical Structures Used 13
  14. 14. Stormwater Planning Division Typical Structures Used – Plunge Pool 14
  15. 15. Stormwater Planning Division Typical Structures Used – Cross Vanes 15
  16. 16. Stormwater Planning Division Typical Structures Used – Stone Toe Protection 16
  17. 17. Stormwater Planning Division Typical Structures Used – Wing Deflector 17 http://library.water-resources.us/docs/MMDL/ECO/MM_Description.cfm?ID=38 http://www.corduroybrook.org/wing-deflectors.php
  18. 18. Stormwater Planning Division Video of Typical Structures Used 18
  19. 19. Stormwater Planning Division Stream Stabilization-Retaining Walls 19 Wall # Wall Type Condition Recommendation 1 & 2 Metal Sheeting Fair Refurbish 3 Gabion Basket Good None 4 & 5 Concrete Poor Further Analysis* 6 & 9 Riprap Poor Refurbish 7 Bridge Abutment Poor Remove 8 Riprap & Gabion Basket Poor Replace *Further geotechnical analysis required prior to recommendation
  20. 20. Stormwater Planning Division Stream Stabilization-Retaining Walls 20 Wall # Wall Type Condition Recommendation 10 Gabion Basket Fair Replace 11 Concrete Block Poor Remove 12 Gabion Basket Fair Remove 13 & 15 Riprap Fair Refurbish 14 Wood H-Pile Fair *Further Analysis 16 Wood H-Pile Fair *Further Analysis *Further geotechnical analysis required prior to recommendation 13
  21. 21. Stormwater Planning Division Retaining Wall Refurbishment- Sheet Pile 21 • Remove surface rust and paint with a marine application coating • Fasten supplemental steel sections to the front of the wall if needed
  22. 22. Stormwater Planning Division Retaining Wall Refurbishment- H-Pile with Wood Lagging 22 • Replace deteriorated wood sections • Remove surface rust at steel sections and paint with a marine application coating • Re-secure and reinstall loose or missing bolts
  23. 23. Stormwater Planning Division Retaining Wall Replacement H-Pile with Wood Lagging 23
  24. 24. Stormwater Planning Division Retaining Wall Replacement H-Pile with Concrete Lagging 24 http://www.vertical-earth.com/services/view/30
  25. 25. Stormwater Planning Division Construction Example 25
  26. 26. Stormwater Planning Division Construction Example 26
  27. 27. Stormwater Planning Division Construction-Access 27 Existing Maintenance Access Road from Pike Road 6015 Telegraph Road Lot
  28. 28. Stormwater Planning Division 28 Other Pike Branch projects
  29. 29. Stormwater Planning Division 29 Next Steps – Schedule • Complete Preliminary Design - April 2017 • Complete 95% Design - June 2017 • Community Meeting - June 2017 • Complete Final Design - August 2017 • Construction - TBD
  30. 30. Online Resources 30 Stormwater Planning Division Website http://www.fairfaxcounty.gov/dpwes/stormwater/ Fairfax County Watershed Planning http://www.fairfaxcounty.gov/nvswcd/newsletter/planning.htm Cameron Run Watershed Plan http://www.fairfaxcounty.gov/dpwes/watersheds/cameronrun.htm EPA Water Quality Laws & Regulations http://www.epa.gov/water/laws.html Stormwater Planning Division To receive project updates, email Catherine.Torgersen@fairfaxcounty.gov or call 703-324-5500, TTY 711.
  31. 31. Stormwater Planning Division Contact Information Contact Information Design Catherine Torgersen– Project Manager 703-324-5864 Catherine.Torgersen@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 31

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