Flatlick Branch-Phase 1 Stream Restoration

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The Flatlick Branch - Phase I Stream Restoration project involved restoring over 1,850 linear feet of stream and tributaries. It upgraded an existing stormwater basin to a constructed wetland, replaced a failed stream crossing, and sewer main. Native plants were installed, and the project provides pollutant removal and water quality benefits. Completed in December 2016, it enhanced the stream valley through inter-agency cooperation between Fairfax County agencies and the Park Authority.

A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Flatlick Branch – Phase I Stream Restoration
January 6, 2017
Contract No. CN13125088
Project No. SD-000031-010
Sully District

Flatlick Branch – Phase I Stream Restoration
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Project Details
The Flatlick Branch – Phase I Stream Restoration project was substantially completed on December 8, 2016. The project involved
the restoration of over 1,850 LF of the Flatlick Branch stream and associated tributaries in the Cub Run Watershed, and retrofitting
an existing stormwater management basin into a Level II constructed wetland.
Project Overview:
• Provide stream improvements to this stream as well as two connecting tributaries
• Upgrade an existing stormwater detention pond from a dry pond to a Level II constructed wetland
• Remove and replace a failed fair weather stream crossing identified on the countywide trail plan
• Replace a section of 24-inch diameter sanitary sewer main
• Through a partnership with the Fairfax County Park Authority, the trail system within the stream valley park was enhanced to
an asphalt trail
• Invasive species treatment for the site and installing 11,000 native plants
Flatlick Branch – Phase I Stream Restoration
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Benefits:
• Pollutant Removal Credit provided towards meeting the Chesapeake Bay Total Maximum Daily Load (TMDL).
• Phosphorus removal – 140 lbs / year
• Nitrogen removal – 1,140 lbs / year
• Suspended solids – 34 tons/year
Project Team:
• Stormwater Planning Division – Fred Wilkins
• Stormwater Planning Division – Chris Ruck
• Fairfax County Park Authority – Ryan Stewart
• Wastewater Collection Division – Shwan Fatah
• Utilities Design and Construction Division (UDCD) - Jay Horstman
• Project Inspector, UDCD – Bharat Khanal

Before After
Flatlick Branch - Phase I Stream Restoration
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
Flatlick Branch – Phase I Stream Restoration
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Irene Haske, Public Information Officer
703-324-5821, TTY 711
SWPDmail@fairfaxcounty.gov

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Flatlick Branch-Phase 1 Stream Restoration

1. A Fairfax County, VA, publication Department of Public Works and Environmental Services Working for You! Flatlick Branch – Phase I Stream Restoration January 6, 2017 Contract No. CN13125088 Project No. SD-000031-010 Sully District

2. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

3. Project Details The Flatlick Branch – Phase I Stream Restoration project was substantially completed on December 8, 2016. The project involved the restoration of over 1,850 LF of the Flatlick Branch stream and associated tributaries in the Cub Run Watershed, and retrofitting an existing stormwater management basin into a Level II constructed wetland. Project Overview: • Provide stream improvements to this stream as well as two connecting tributaries • Upgrade an existing stormwater detention pond from a dry pond to a Level II constructed wetland • Remove and replace a failed fair weather stream crossing identified on the countywide trail plan • Replace a section of 24-inch diameter sanitary sewer main • Through a partnership with the Fairfax County Park Authority, the trail system within the stream valley park was enhanced to an asphalt trail • Invasive species treatment for the site and installing 11,000 native plants Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Benefits: • Pollutant Removal Credit provided towards meeting the Chesapeake Bay Total Maximum Daily Load (TMDL). • Phosphorus removal – 140 lbs / year • Nitrogen removal – 1,140 lbs / year • Suspended solids – 34 tons/year Project Team: • Stormwater Planning Division – Fred Wilkins • Stormwater Planning Division – Chris Ruck • Fairfax County Park Authority – Ryan Stewart • Wastewater Collection Division – Shwan Fatah • Utilities Design and Construction Division (UDCD) - Jay Horstman • Project Inspector, UDCD – Bharat Khanal

4. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Project Area 50 Lee Jackson Memorial Highway Flatlick Branch Chantilly, VA, Tax Map No. 44-2 Sully District

5. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Construction

6. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Sewer Main Replacement

7. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Fair Weather Stream Crossing

8. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Fair Weather Stream Crossing

9. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Level II Constructed Wetland - Construction

10. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Level II Constructed Wetland

11. Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Asphalt Trail

12. Before After Flatlick Branch - Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

13. Additional Information For additional Information, please call www.fairfaxcounty.gov/dpwes Flatlick Branch – Phase I Stream Restoration Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch Irene Haske, Public Information Officer 703-324-5821, TTY 711 SWPDmail@fairfaxcounty.gov

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