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A Fairfax County, VA, publication
Department of Public Works and Environmental ServicesWorking for You!
Retrofit Facility DP0625 West Potomac High School
November 27, 2017
Contract No. CN15125135Task Order No.1 Project No. SD-000031-143Mt Vernon District
Retrofit Facility DP0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Project Details
Description:The West Potomac HS pond retrofit project was substantially completed on October 5, 2017. The overall project consisted of two 18 inch deep forebays; extended detention wetland with depths up to 18 inches; an 18 inch deep micro pool; and a new riser structure which serves to improve the quality of water discharged from the pond. Purpose of this design is to extend the flowpath through the pond to the maximum extent possible and improve the storage volume of the pond. Improvements will increase the residence time of water in the pond and provide enhanced water quality benefits.
Project Overview:• Regraded the facility to lengthen the flow path and maximize pond volume• Excavated and constructed micro-pool to maximize ponding depth of 18”• Installed two curb inlets to capture stormwater runoff from school parking lot• Removed existing headwall and replaced with a new riser structure with a concrete apron and reverse slope trash rack• Restored the site with selective seed mix and native plantings
Retrofit Facility DP0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Benefits: • Total Nitrogen Reduction (TN) – 76.30 lb/yr• Total Phosphorus Reduction (TP) – 13.19 lb/yr• Total Suspended Solids Reduction (TSS) – 12,416.43 lb/yr
Project Team:• Stormwater Planning Division – David Anglin, Kenneth Trinh• Utilities Design and Construction Division (UDCD) – Christopher Triolo, Alan Rashid• Project Inspector, UDCD – Jeff Bartlett, James Beachum• Bowman Consulting, Design Consultant- Roy Waugh, Steven Liam, Camilo Apolinares• Contractors: PITT Construction, Inc. and Ashburn Contracting Corporation
Retrofit Facility PD0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Mt Vernon District, Tax Map No. 93-1 ((01)) 0054
Retrofit Facility PD0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
New Pavement & Drainage Swale – Stokes Lane
Retrofit Facility PD0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Completed Project
Before After
Retrofit Facility PD0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Additional Information
For additional Information, please call
www.fairfaxcounty.gov/dpwes
Retrofit Facility DP0625 West Potomac High School
Capital Facilities/Utilities Design and Construction Division/Transportation and Stormwater Construction Branch
Matthew Kaiser, Public Information Officer703-324-8455, TTY 711
