The Green Hill Estates Sewer Emergency project addressed a broken 8-inch sewer pipe and the erosion of the adjacent stream. The emergency was discovered during routine sewer cleaning and inspection. A break, along with several other defects, were noted in the sewer. In addition, the creek had eroded and had partially exposed the pipe. The stream was diverted and restored, and the broken pipe segment was replaced with a section of PVC pipe. The project was substantially completed August 10, 2021.  

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Project No. WW-000028-030
Mount Vernon District
September 2, 2021
Green Hill Estates Emergency Sewer Repair

2. Project Details
Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Description:
The Green Hill Estates Sewer Emergency project addressed a broken 8-inch sewer pipe and the erosion of the
adjacent stream. The emergency was discovered during routine sewer cleaning and inspection. A break, along with
several other defects, were noted in the sewer. In addition, the creek had eroded and had partially exposed the pipe.
The stream was diverted and restored, and the broken pipe segment was replaced with a section of PVC pipe. The
project was substantially completed August 10, 2021.
Project Overview:
• The stream was diverted away from the sewer, and large rocks were placed on the stream banks to protect the
pipe from erosion.
• Two vanes (U-shaped structures made out of rocks) were placed in the stream to direct high velocities (which
could cause erosion) away from the banks and towards the center of the stream.
• Approximately 20 feet of the original 8-inch pipe was replaced with PVC pipe.
Project Team:
• Philip Hwang, P.E., Wastewater Design and Construction Division
• Thomas Grala, P.E., Wastewater Design and Construction Division
• Anna Neugebauer, P.E., Wastewater Collection Division
• Arcadis-Engineer
• Patriot Development Corporation-Contractor

3. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Mount Vernon District, Tax Map No. 99-1
Project location.

4. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Project Overview

5. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Previous Conditions (Closed Circuit Television Inspection of Sewer)
High water level due to a sag in the sewer. Stream water pouring in through a hole in the sewer.

6. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Previous Conditions (Stream Erosion)
Stream bank erosion. Exposed tree roots.

7. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Sewer Bypass System
Sewer Bypass Pump and Fuel Tank
With Spill Containment.
High Density Polyethylene Sewer
Bypass Pipe installed in the woods.

8. Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Sewer Point Repair
Damaged sewer section is exposed. Damaged sewer is replaced with a new PVC pipe.

9. Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Green Hill Estates Emergency Sewer Repair
Stream Repair (Bank Armoring and Vanes)

10. Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Green Hill Estates Emergency Sewer Repair
Stream Repair (Before and After)
Stabilized and armored banks.
Eroded banks, and exposed tree roots.
Before After

11. Additional Information
For additional Information, please call
www.fairfaxcounty.gov/publicworks
Green Hill Estates Emergency Sewer Repair
Capital Facilities/Wastewater Design and Construction Division/Collections Branch
Sharon North, M.A., Section Chief, Communications
703-324-8455, TTY 711
Sharon.North@fairfaxcounty.gov
or
Irene Haske, Communications Specialist
703-324-5821, TTY 711
Irene.Haske@fairfaxcounty.gov