flatlick branch - phase 1 stream restoration

A Fairfax County, VA, publication

Department of Public Works and Environmental Services

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Flatlick Branch – Phase I Stream Restoration

January 6, 2017

Contract No. CN13125088 Project No. SD-000031-010Sully District

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Project DetailsThe 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

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. 44-2Sully District

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Construction

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Sewer Main Replacement

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Fair Weather Stream Crossing

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Fair Weather Stream Crossing

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Level II Constructed Wetland - Construction

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Level II Constructed Wetland

Flatlick Branch – Phase I Stream Restoration

Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch

Asphalt Trail

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 Officer703-324-5821, TTY 711

SWPDmail@fairfaxcounty.gov