The document summarizes a project to replace the concrete riser structure and principal spillway pipe at Terra Grande Pond in Fairfax County, Virginia. The project was completed on May 18, 2021 and involved installing a new riser and end walls, restoring the dam embankment, installing dual culverts under the maintenance road, and restoring the inflow channel using natural stream design methods. The project team included Thornton Glenn as project manager, Mike Jones as construction inspector, and Brendan Schillo as construction engineer.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Project No. SD-000033-091
Mount Vernon District
Tax Map No. 99-3
6/16/2021
Terra Grande Pond
PSP and Riser Replacement

2. Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch

3. Project Details
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
Project Overview:
• Replacement of the concrete riser structure and principal spillway pipe (PSP)
• Installation of riser end walls
• Restoration of the dam embankment
• Installation of dual culvert pipes under maintenance road
• Restoration of ~300 feet of inflow channel through natural stream design methods
Project Description:
The Terra Grande Pond PSP and Riser Replacement Project was substantially completed
on May 18, 2021. The purpose of this project was to perform necessary capital
maintenance, increase the performance of the pond, enhance the facility, and isolate
future maintenance needs.
Project Team:
• Project Manager - Thornton Glenn, Maintenance and Stormwater Management Division
• Construction Inspector - Mike Jones, Utilities Design and Construction Division
• Construction Engineer - Brendan Schillo, Utilities Design and Construction Division

4. Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
7590 Woodstown Dr., Springfield, VA 22153; Tax Map #99-3

5. Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
Installation of Concrete Riser Structure and End Walls

6. Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
Restoration of Dam Embankment

7. Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
Installation of Dual Culvert Under Maintenance Rd

8. Before After
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch

9. Before After
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch

10. Before After
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch

11. Before After
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch

12. Additional Information
For additional Information, please call
www.fairfaxcounty.gov/publicworks
Terra Grande Pond PSP and Riser Replacement
Capital Facilities/Utilities Design and Construction Division/Stormwater Construction Branch
Sharon North or Irene Haske in the
DPWES Public Information Office
703-324-5500, TTY 711
Sharon.North@fairfaxcounty.gov
Irene.Haske@fairfaxcounty.gov