The Bradley Acres Pond Retrofit project in Fairfax County, VA converted an existing dry pond into a constructed wetland pond. The project removed the existing trickle ditch, excavated three shallow marshes, constructed a step pool conveyance channel and plunge pool, and installed two stone weir structures. Native plants were seeded and trees/plugs were replanted. The project provides improved downstream water quality by removing nutrients and suspended solids from stormwater runoff.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Bradley Acres Pond Retrofit Project
Contract No. CN14125118
Project No. SD-000031-106
Task Order No. 16
Hunter Mill District
May 18, 2015

2. Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Bradley Acres Pond Retrofit
Post Construction

3. Project Details
Bradley Acres Pond Retrofit
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Description:
The Bradley Acres Pond Retrofit project was substantially completed on March 16, 2015. The project is located in the
Horespen Creek Watershed and is bounded by residential units from the northwest, southeast, an open space from the
northeast and bounded by West Ox Road from the south. The project converted an existing extended detention dry
pond to a constructed stormwater wetland pond. The project provides improved down stream water quality benefits
and detention improvement. The water quality benefits realized by this project will be the removal of 21.19 lbs./year of
total phosphorus, 97.77 lbs./year of total nitrogen and 3,751.99 lbs./year of total suspended solids.
Project Overview:
• Removed the existing trickle ditch
• Excavated and constructed three shallow marshes
• Constructed step pool conveyance channel and plunge pool below the existing 42”X27” culvert
• Constructed two imbricated stone weir structures
• Constructed an access maintenance road with 2- 24” RCP culvert structure
• Re-graded the pond as per the approved plan
• Seeded all the disturbed areas with selective Native Grass, Upland and High Marsh Seed mix
• Replanted the site with a mix of trees and plugs
Project Team:
• Stormwater and Planning Division–Martin Chang
• Utilities Design and Construction Division- Yousef Rayyan
• Utilities Design and Construction Division- Keith Ferrell
• Land Acquisition Division- Clinton Preston
• Surveyor- Gregory Harper

4. Bradley Acres Pond Retrofit
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Hunter Mill District, VA, Tax Map #25-3
Project Site

5. Bradley Acres Pond Retrofit
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Pre-Existing Conditions

6. Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Bradley Acres Pond Retrofit
Post Construction
New Access Road
Shallow Marsh #3
Stone Weir #2
Shallow Marsh #2
Stone Weir #1
New Step Pool Conveyance Channel
Shallow Marsh #1
An Existing RC Outlet Pipe 42”x27”

7. Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Bra
Bradley Acres Pond Retrofit
Pre-Existing Conditions
The Inflow RC Outlet 42”x27” Pipe Conditions

8. Bradley Acres Pond Retrofit
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch
Post-Construction

9. Bradley Acres Pond Retrofit
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Pre-Existing Conditions

10. Bradley Acres Pond Retrofit
Post Construction
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Bra
West Ox Rd
Access Road Gate
2- 24” RCP Culvert Structure

11. Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
Ben Boxer, Public Information Officer
703-324-5880, TTY 711
Ben. Ben Boxer, Public Information Officer
703-324-5880, TTY 711
Ben. Ben Boxer, Public Information Officer
703-324-5880, TTY 711
Ben.Boxer@fairfaxcounty.gov
Irene Haske, Public Information Officer
703-324-5500, TTY 711
Irene.Haske@fairfaxcounty.gov
Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater Construction Branch