The document outlines the virtual community meeting regarding the Oak Marr Pump Station rehabilitation project in Fairfax County, scheduled for December 7, 2021. Key topics include project background, design and construction phases, and the expected timeline, with construction anticipated to begin in summer 2022 and completion in summer 2023. The meeting aimed to inform community members about the project's impact and address any questions they may have.

1. A Fairfax County, VA, publication
Department of Public Works and Environmental Services
Working for You!
Oak Marr Pump Station Rehabilitation – Construction Project
Wastewater Project – Virtual Community Meeting
Microsoft Teams – December 7, 2021, at 6:30 p.m.
Fairfax County Project Manager: Christopher Mata, P.E.
Project Engineer: HDR & RK&K
December 2021

2. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Agenda
2
1. Project Team Introductions & Attendee Virtual Sign-In
2. Project Location
3. Project Background & Need
4. Study Phase
5. Design Phase
6. Construction Phase
7. Project Schedule
8. Questions and Answers

3. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Project Team Introductions & Attendee Virtual Sign-In
3
• Fairfax County Project Manager:
– Christopher Mata, P.E. – Senior Engineer III
• Department of Public Works and Environmental Services (DPWES) – Capital Facilities –
Wastewater Design and Construction Division – Wastewater Collection Branch
• HDR Project Team:
– Fady Afif, P.E. – Project Manager
– Badana Mohamadi – Project Engineer
• RK&K Project Team
– Mike Klevenz, P.E. – QA/QC

4. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Virtual Meeting Administrative Items
4
• Attendee Virtual Sign-In (2 options)
1. Private Message me on MS Teams – Name, Property Address, Email,
Phone Number
2. Email me @ cmata0@fairfaxcounty.gov - Name, Property Address,
Email, Phone Number
• To reduce feedback, please remain on mute until the end of the
presentation during the Q&A
• The chat board on the right-side of your screen is available
throughout the presentation

5. Oak Marr Pump Station Rehabilitate – Construction Project
Project Location
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 5
Project
Location
Flow Direction
Sewer service area
and project area

6. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Project Background & Need
6
• Neighborhood was built in the 1980s,
and the sewer infrastructure has been in
operation since.
• Aged pump station equipment – pumps,
valves, fans, concrete, etc.
• This aging equipment has the potential
of causing:
– Sanitary Sewer Overflows (SSO)
– Sewer back-ups into homes
– Environmental damages
– Maintenance problems

7. Oak Marr Pump Station Rehabilitate – Construction Project
Existing Conditions
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 7
Incoming Flows
Outgoing Flows
Pump
Station
Site

8. Oak Marr Pump Station Rehabilitate – Construction Project
Existing Conditions
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 8
Incoming Flows
Outgoing Flows
Pump
Station
Site
EXISTING
ACCESS
ROAD/ TRAIL
EXISTING
FENCE
EXISTING
BUILDING
EXISTING
MANHOLES
EXISTING
FUEL TANK

9. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Study Phase
9
• Fall 2020 study:
– Evaluated existing conditions – flow analysis, hydraulic
assessment, site & equipment assessment.
– Alternative analysis and recommendation to rehabilitate the
pump stations.
• Criteria: Community impacts, schedule, cost, constructability,
maintainability, operability, reliability
• Recommended Alternative:
– Construct a parallel pump station on the same parcel
– Repurposing 4 existing below-ground structures & installing 2
new below-ground structures
– Pump station building will remain & new generator to be
installed outside
– Sewer services will not be impacted

10. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Design Phase
10
• Includes Designing:
– Pumps and wet-well
– Permanent by-pass & meter vault
– New enclosed standby generator
– Re-routing of sewer force main
– Station fence (w/ slats) realignment
– Access road repaving and widening in
front of the pump station
– Adding another gate
– Miscellaneous concrete work

11. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Design Phase
11
EXPANDED ACCESS
ROAD
EXTENDED
FENCE
TEMPORARY
CONSTRUCTION
EASEMENT
STANDBY
GENERATOR
NEW
UNDERGROUND
STRUCTURES
TREE
REMOVAL
Repurposed below-
ground structures (x4)

12. Oak Marr Pump Station Rehabilitate – Construction Project
Proposed Changes
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 12
Proposed Tree Removal
These
trees to
remain
Proposed trimming of
branches
Pond

13. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
Construction Phase - What to expect
13
• Construction Activity:
– Construction entrance off of Elmesmeade
Ct. cul-de-sac.
– Some construction activity to take place
along trail pathway.
– Excavation for the new wet well and valve
vault
– Dewatering until excavation is complete and
new structures have been placed
– Installing precast structures for wet well and
valve vault
– Installing emergency generator
– Bypass pumping within project site.

14. Oak Marr Pump Station Rehabilitate – Construction Project
Construction Phase – Access Through the Community
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 14

15. Oak Marr Pump Station Rehabilitate – Construction Project
Project Schedule
15
Capital Facilities – Wastewater Design and Construction Division – Collections Branch
December 2019
Study Began
October
2020
Study
Complete
January 2022
Anticipate
Acquiring all
Land Rights
Summer 2022*
Construction
Beginning
December 2021
Public Meeting
Summer 2023*
Construction
Completion
March 2021
Design Began
*This was updated as of March 2022

16. Oak Marr Pump Station Rehabilitate – Construction Project
Capital Facilities – Wastewater Design and Construction Division – Collection Branch
Questions & Answers
16
Capital Facilities – Wastewater Design and Construction Division – Collections Branch

17. Additional Information
For additional information, please contact
www.fairfaxcounty.gov/publicworks
Oak Marr Pump Station Rehabilitate – Construction Project
Christopher Mata, P.E.
703-324-5111, TTY 711
cmata0@fairfaxcounty.gov
Capital Facilities – Wastewater Design and Construction Division – Collections Branch 17
Questions & Answers