The Potomac Meadow Water Quality Improvements Project retrofitted an existing stormwater pond in Fairfax County, VA to improve water quality. The project included installing bioswales, replacing culverts, constructing stormwater wetlands, and modifying the pond structure. The project was completed on time and within budget in March 2016 to treat stormwater runoff from surrounding residential areas and reduce pollution entering Pond Branch Watershed.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Potomac Meadow Water Quality Improvements Project
Contract No. CN14125117
Project No. SD-000031-117
Task Order No. 32
Dranesville District
May 17, 2016
Potomac Meadow Water Quality Improvements Project

2. Potomac Meadow Water Quality Improvements Project
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch

3. Project Details
Potomac Meadow Water Quality Improvements Project
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
Description:
The Potomac Meadow Water Quality Improvement Project was substantially completed on March 18, 2016, on time and within
budget. The existing pond (ID# 0303DP) is located within the Pond Branch Watershed and is surrounded by River Bend Road on the
east, Lagovista Court on the south, single family homes from west and wooded areas on the north. The work included retrofit of the
existing drainage channel, replacement of driveway culverts, installation of a constructed stormwater wetland, installation of a
bioswale and replacement of the existing top structure with a modified T-DI-7 top. The site was graded for positive drainage and
restored with selective seed mix.
Project Overview:
The upper section of the project:
• Removal of the existing trickle ditch and construction of a 95’LX8’W BIOSWALE-2
• Treatment of the existing pond bottom area with compost amendment
• Installation of a flow diverter weir at the concrete channel along Monalaine Court to divert the flow into the bioswale
• Restoration of the disturbed area with seed mix and trees
The lower section of the project:
• Replacement of the two existing 14”X23” RECP culverts with four 14”X23”RECP
• Restoration of the disturbed driveway of property at 414 River Bend Road
• Construction of a 105’ L X 8’ W BIOSWALE
• Construction of two stormwater wetlands and two imbricated stone weirs
• Replacement of the top of the existing structure with a new modified DI-7 top
• Restored the disturbed area with seed mix and trees
Project Team:
• Stormwater Planning Division – Vivian Bui
• Utilities Design and Construction Division (UDCD) - Yousef Rayyan
• Project Inspector, UDCD - Keith Ferrell
• Survey Analyst, UDCD - Gregory Harper

4. Potomac Meadow Water Quality Improvements Project
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
Tax Map No. 8-4
Upper Section of the project site
Lower Section of the project site
Property at 414 River Bend Rd.
Trickle ditch
Driveway Culverts

5. Potomac Meadow Water Quality Improvements Project
PRE-EXISTING CONDITION/LOWER SECTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
Structure # 8 Lid had to be replaced
10’ of the existing concrete ditch had to be replaced

6. Potomac Meadow Water Quality Improvements Project
POST CONSTRUCTION/LOWER SECTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
Modified DI-7 Top
2-Type A1
Grates
10’ New Concrete V-ditch

7. Potomac Meadow Water Quality Improvements Project
PRE-EXISTING CONDITION/LOWER SECTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
2-14”x23” RCP Culvert

8. Potomac Meadow Water Quality Improvements Project
POST CONSTRUCTION/LOWER SECTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
105’L X 8’W Bio-Swale -1 with EC-3 Matting
New 14”x23” Culverts

9. Potomac Meadow Water Quality Improvements Project
DURING CONSTRUCTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch

10. Potomac Meadow Water Quality Improvements Project
PRE-EXISTING CONDITION/UPPER SECTION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
Existing Trickle Ditch

11. Potomac Meadow Water Quality Improvements Project
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch
POST CONSTRUCTION/UPPER SECTION
Coir Logs- Check DamNew 95’L x 8’W Wide Bio-Swale Channel
EEC-3 Matting

12. Potomac Meadow Water Quality Improvements Project
DRIVEWAY RESTORATION
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch

13. Before After
Potomac Meadow Water Quality Improvements Project
Capital Facilities/Utilities Design and Construction Division/Transportation & Stormwater Construction Branch

14. Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
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