This Fairfax County project seeks to stabilize excessive, ongoing stream erosion which threatens sanitary sewer pipes, undermines trees, impacts water quality and degrades habitat for aquatic life.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Cameron Run
Tributary at La Vista
Drive Stream
Restoration
Project No. SD-000031-215
Lee District
Tax Map No. 0821 17 A & 0821 17 E
June 2020

2. Stormwater Planning Division
Agenda
• Stormwater Program Drivers
• Environmental Programs
• Watershed
• Project Goals
• Impacts of Impervious Surfaces
• Existing Conditions
• Typical Restoration Practices
• Example Construction Efforts
• Example Completed Projects
• Next Steps
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3. Stormwater Planning Division
Stormwater Program Drivers
The Clean Water Act of 1972 …
Regulate pollutant discharge to the Waters of the U.S.
Chesapeake Bay Preservation Act
Program to improve the water quality in the Chesapeake.
Other State & Federal Standards
– Municipal Separate Storm Sewer System Permit (MS-4):
• Under this permit, the we need to have programs to regulate pollutant discharge
– Virginia Stormwater Management Act & Virginia Stormwater Management Program
– Fairfax County Code/Ordinance – Chapter 124, Stormwater Management Ordinance
– Easements: Rights & Responsibility to maintain/upgrade
– Total Maximum Daily Loads (TMDL)
– Regulates amounts of pollutants in waterways – a pollutant budget
– Chesapeake Bay TMDL’s for Nitrogen, Phosphorus, & Total Suspended Sediment
– Local TMDL’s for Sediment, Bacteria (E. Coli), & PCB’s
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Cameron Run Tributary at La Vista Drive Stream Restoration

4. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Environmental Programs
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Preserve & Restore
Our Natural Water Resources
• Stream Restorations
• Basin Retrofits
• Construction of New Facilities
• Outfall Improvement/Rehabilitation

5. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Fairfax County Watersheds
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Project site
in the
Cameron Run
watershed

6. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Project Goals
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The project seeks to stabilize excessive ongoing stream erosion which threatens
sanitary sewer pipes, undermines trees, impacts water quality, and degrades habitat
for aquatic life.
Project components include:
• Raising the stream channel bottom to allow water to spread out over the floodplain
• Installing instream structures to direct flow, alleviate erosive forces on stream
banks, and provide instream habitat
• Burying exposed sanitary sewer lines and protecting adjacent infrastructure
• Controlling non-native invasive plants
• Reforesting the site with native trees, shrubs, and plants

7. Cameron Run Tributary at La Vista Drive Stream Restoration
Stormwater Planning Division
Impacts of Impervious Surfaces
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8. Cameron Run Tributary at La Vista Drive Stream Restoration
Stormwater Planning Division
Impacts of Impervious Surfaces
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Increased impervious surfaces increases
runoff entering stream channels.
With increased flow, the channel will
begin to degrade with the channel
bottom down cutting. The channel will
continue to move downward (vertically)
until it reaches a hard surface, then it will
start to widen (horizontally).
With time if conditions do not change
further, the stream channel can
reestablish a stable channel form.
This project site is a Stage III.

9. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Project Area Limits
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Clouds Mill Dr.
La Vista Dr.

10. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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Incised channel with bank heights
averaging 5-6 feet

11. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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Exposed Sanitary Sewer Pipe

12. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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Vertical bank heights
averaging 6 feet with
exposed sanitary
sewer pipe.

13. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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Vertical channel bank
heights averaging 6-
feet. Potential future
impacts to sanitary
sewer infrastructure.
Manhole

14. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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6-foot tall, vertical
eroding stream bank

15. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Existing Conditions
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Tree fell shortly
after initial survey.

16. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Typical Restoration Practices – Cross Vanes
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These instream rock structures maintain
channel grade, alleviate bank stress on
meanders, and create pools.

17. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Typical Restoration Practices – Root Wads
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Root wads are
placed along
bends and act a
type of armor for
the bank. They
also provide
habitat and cover
for fish and other
aquatic life.

18. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example of Construction Efforts – Access Road
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Access road typically
consists of deck
matting underlaid
with mulch for
construction
equipment to
traverse. This
disperses equipment
weight and
decreases tree root
impacts and soil
compaction.

19. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example of Construction Efforts – Channel Grading
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20. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example of Construction Efforts – Tree Removal
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We work closely with Urban Forest Management Division staff, arborists, and
landscape architects to minimize impacts and preserve trees.
All trees within the project area with a
diameter greater than 12 inches were surveyed
and information on species, size, and health
was recorded.
• 183 Trees surveyed
• 67 are proposed to be removed

21. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Native Planting is included
Following Planting Density Requirements, after
completion of construction we will be planting:
• 157 Overstory Trees (100 per 1 Acre Disturbed
Land)
• 314 Understory Trees (200 per 1 Acre Disturbed
Land)
• 1,707 Shrubs (1,089 per 1 Acre Disturbed Land)
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22. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
More Native Plants
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23. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example Completed Projects
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Lower Potomac Ballpark Outfall
May 2020
(immediately following completion)
July 2016

24. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example Completed Projects
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Pike Branch Trib at Ridgeview Park
March 2020
(immediately following completion)
December 2018

25. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example Completed Projects
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Turkey Run at Truro
February 2018
(∼1 Year after construction completion)
March 2016

26. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example Completed Projects
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Turkey Run at Truro
May 2019
(∼2 Years after construction completion)
March 2016

27. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Example Completed Projects
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Dead Run Segment 1
May 2020
(∼2 Years after construction completion)
March 2016

28. Stormwater Planning Division
Cameron Run Tributary at La Vista Drive Stream Restoration
Next Steps
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• Easement Acquisition
• Design Completion
• Permitting
• United States Army Corps of Engineers
• Virginia Department of Environmental Quality
• Fairfax County
• VDOT
• Construction
• Approximate duration: 11 months
• Post Construction
• Completed project carries 1-year warranty
• After warranty period, County assumes
monitoring and maintenance responsibilities

29. Additional Information
For additional information, please contact
www.fairfaxcounty.gov/publicworks
Cameron Run Tributary at La Vista Drive Stream Restoration
Stormwater Planning Division
Ken Trinh, Project Manager
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703-324-1016
kenneth.trinh@fairfaxcounty.gov