Potomac Meadow Water Quality Improvement July 2016

A Fairfax County, VA, publication

Department of Public Works and Environmental Services

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Potomac Meadow Water Quality Improvements ProjectContract No. CN14125117Project No. SD-000031-117Task Order No. 32Dranesville District

May 17, 2016

Potomac Meadow Water Quality Improvements Project


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

Project DetailsPotomac Meadow Water Quality Improvements Project


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 treesThe 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



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

Potomac Meadow Water Quality Improvements ProjectPRE-EXISTING CONDITION/LOWER SECTION


Structure # 8 Lid had to be replaced

10’ of the existing concrete ditch had to be replaced


POST CONSTRUCTION/LOWER SECTION


Modified DI-7 Top

2-Type A1 Grates

10’ New Concrete V-ditch


PRE-EXISTING CONDITION/LOWER SECTION


2-14”x23” RCP Culvert


POST CONSTRUCTION/LOWER SECTION


105’L X 8’W Bio-Swale -1 with EC-3 Matting

New 14”x23” Culverts

Potomac Meadow Water Quality Improvements ProjectDURING CONSTRUCTION



PRE-EXISTING CONDITION/UPPER SECTION


Existing Trickle Ditch



POST CONSTRUCTION/UPPER SECTION

Coir Logs- Check DamNew 95’L x 8’W Wide Bio-Swale Channel

EEC-3 Matting


DRIVEWAY RESTORATION


Before After



Additional Information

For additional Information, please call

www.fairfaxcounty.gov/dpwes

Irene Haske, Public Information Officer703-324-5500, TTY [email protected]


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Potomac Meadow Water Quality Improvement July 2016