The document describes the Sequoia Park Pond (0705DP) Retrofit Project in Fairfax County, VA, which retrofitted an existing stormwater pond to provide improved water quality benefits through the construction of micro-pools, rock weirs, and other features; it provides details on the project overview, team members, and pre-existing and new conditions of the pond and surrounding area; additional information can be found by contacting the Fairfax County Department of Public Works and Environmental Services.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Sequoia Park Pond (0705DP) Retrofit Project
Contract Number CN13125095
Project Number SD-000031-123 A
Task Order No. 21
Mason District
August 2014

2. Sequoia Park Pond (0705DP) Retrofit Project
Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater
Construction Branch

3. Project Details
Sequoia Park Pond (0705DP) Retrofit Project
Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Description:
The Sequoia Park Pond (0705DP) Retrofit Project was substantially completed on June 23, 2014.
Sequoia Park Pond is an existing stormwater management pond located on the north side of the
intersection at Edsall Road and Dublin Avenue. The existing pond was retrofitted to provide improved
down stream water quality benefits and detention. The proposed water quality benefits realized by this
project will be the removal of 9 lbs/year of total phosphorus, 41 lbs/year of total nitrogen and 1750 lbs/year
of total suspended solids.
Project Overview:
• Removed the existing trickle ditch.
• Excavated and constructed four micro-pools at a maximum depth of 18” below the pond bottom.
• Extended the existing 18” RCP and installed a new EW-1 along with 2’ depth of river jack bedding
• Constructed two rock weir structures
• Replaced the existing 4’ trail by 12’ wide asphalt access road.
• Installed a proposed driveway CG-9D entrance for maintenance road (under construction)
• Restored the site with selected seed mix, planting plugs (trees will be planted in end of Sept. 2014).
• Project Team:
• Stormwater and Planning Division – Joseph P. Riley-Ryan
• Utilities Design and Construction Division - Yousef Rayyan
• Utilities Design and Construction Division - Kenneth Atkins
• Surveyor - Gregory Harper

4. Sequoia Park Pond (0705DP) Retrofit Project
Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Springfield, VA Tax-Map 0714-((30))-B
Project Site

5. Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Sequoia Park Pond (0705DP) Retrofit Project
Pre-Existing/New Conditions of the Inflow Locations
Concrete inflow trickle ditch
Before After
Inflow locations were stabilized with
coir matt and reinforced bedding
material

6. Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Sequoia Park Pond (0705DP) Retrofit Project
Pre-Existing/New Condition of the Pond Site
micro pool No. 4
micro pool No. 3
micro pool No. 2
micro pool No. 1
existing outlet structure
Edsall Road
12’ wide asphalt access road
rock weir 1 and 2

7. Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Sequoia Park Pond (0705DP) Retrofit Project
4’ wide pre-existing trail
12’ wide new access road
Pre-Existing Condition and New Condition of the Asphalt Trail
Before After

8. Sequoia Park Pond (0705DP) Retrofit Project
Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater
Construction Branch
Before After

9. Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
Stormwater Planning, Capital Facilities/Utilities Design and Construction Division/Transportation Stormwater
Construction Branch
Sequoia Park Pond (0705DP) Retrofit Project
Irene Haske, Public Information Officer
703-324-5821, TTY 711
SWPDmail@fairfaxcounty.gov