Huntington Levee Community Meeting: Feb. 23, 2016

1. Department of Public Works and Environmental Services
Huntington Levee
Community Meeting
February 23, 2016

2. Building Design and Construction Division 2
Agenda
Huntington Levee
I. Project Background
II. Design Updates
III. Community Amenities
IV. Construction
V. Environmental Design
VI. Flood Modeling Results
VII. Permitting
VIII. Community Outreach
IX. Questions

3. Building Design and Construction Division 3
Project Background
• June 2006 -160 homes
were flooded from a storm
event
• 2009 – US Army Corps of
Engineers (USACE)
completed a study to
evaluate flood damage
reduction measures in the
Huntington Community

4. Building Design and Construction Division 4
Project Background
• November 6, 2012 – Fairfax County voters approved stormwater
bond referendum to fund design and construction of flood damage
reduction measures proposed by the USACE
• June 2013 – Fairfax County awarded the levee design contract to
ARCADIS
• November 2013 – ARCADIS submitted the Phase I design package to
Fairfax County
• January 2014 – Fairfax County and Huntington Community reached
consensus on conceptual design features
• July 2014 – ARCADIS completed Hydraulic and Hydrologic Modelling
for Cameron Run

5. Building Design and Construction Division 5
Project Background
• September 2014 – ARCADIS submitted Schematic (30%) Design
package to Fairfax County
• October 2014 - Fairfax County conducted Value Engineering
Workshop
• June 2015 – ARCADIS submitted Design Development (60%) Design
package to Fairfax County
• July 2015 – Design review by Fairfax County and US Army Corps of
Engineers
• February 2016 – ARCADIS submitted Construction Documents
(100%) Design package to Fairfax County
• February 2016 – Technical review of Construction Documents

6. Building Design and Construction Division 6
Project Background
Levee System

7. Building Design and Construction Division 7
Project Background
Key Design Features
• Earthen Levee/I-Wall Combination
• Pump Station
• Stormwater Diversion

8. Building Design and Construction Division 8
Design Updates
Rendering – Looking West
Levee I-Wall
Open Channel
Ponding Area
Cameron Run

9. Building Design and Construction Division 9
Design Updates
Rendering – Looking East from Top of Levee Trail
Asphalt
Trail
Open Channel
with Drains
Ponding
Area
Ponding Area
Slope Slope
Slope

10. Building Design and Construction Division 10
Design Updates
Rendering – Looking East with Cross Section
Asphalt
Trail
Open Channel
with Drains
Ponding
Area
Ponding Area
Slope Slope
Slope

11. Building Design and Construction Division 11
Design Updates
Open Channel
• Shallow Channel Parallel to Levee
• Overland Flow for Major Storm
• Geo-Textile to Prevent Erosion
• Drainage at Regular Intervals

12. Building Design and Construction Division 12
Design Updates
Rendering – Looking East from Top of Levee Trail
Asphalt Trail
Concrete
I-Wall
Ponding Area

13. Building Design and Construction Division 13
Design Updates
Rendering – Looking Northwest from Trail in Ponding Area
Ponding
Area Trail
Open Channel
Levee
Ponding Area
(Native Grasses)

14. Building Design and Construction Division 14
Design Updates
Rendering – Looking Northeast Toward Pump Station
Note: Fence with gate to be constructed around Pump Station

15. Building Design and Construction Division 15
Design Updates
Rendering – Cross Section of Pump Station

16. Building Design and Construction Division 16
Community Amenities
Trails
Native Grasses in Ponding Area, Mowed 1-3 times per Year
Trail Atop
Levee
Trail in
Ponding
Area
Pump
Station
Existing
Trail
Service
Drive

17. Building Design and Construction Division 17
Community Amenities
Playground Area in Farrington Park
• Worked with Community Group in Fall 2015
• Meeting Held with Volunteer Group November 18, 2015
• Separate Equipment for Age Groups
• Swings: Well Liked, but would take up Most of the Park
• Animal Theme
• Maximize Equipment in Small Area

18. Building Design and Construction Division 18
Community Amenities
Playground Area in Farrington Park – Proposed Design

19. Building Design and Construction Division 19
Construction
Preliminary Planned Construction Access
• Route A: Primary Construction Access
• Route D: Secondary Access for Pump Station
• Routes B and C: Possible Tertiary Construction Access

20. Building Design and Construction Division 20
Environmental Design
Envision
• Rating System for Infrastructure Projects
• Bronze Level
• Similar to LEED
• 5 Categories:
• Quality of Life
• Leadership
• Resource Allocation
• Natural World
• Climate and Risk

21. Building Design and Construction Division 21
Flood Modelling Results
Protection of Homes from 100-Year Storm
Flood elevation 1-ft below lowest home opening

22. Building Design and Construction Division 22
Flood Modelling Results
100-year Stormwater Ponding
Some Street Flooding, but Water Surface Elevation Below Structures

23. Building Design and Construction Division 23
Flood Modelling Results
25-year Stormwater Ponding
Some Street Flooding, but Water Surface Elevation Below Structures

24. Building Design and Construction Division 24
Flood Modelling Results
10-year Stormwater Ponding
Some Street Flooding, but Water Surface Elevation Below Structures

25. Building Design and Construction Division 25
Permitting Update
• In Process
• Joint Permit Application (Wetlands)
• Conditional Letter of Map Revision (CLOMR)
• DEQ Permit
• Building Permit
• Site Permit
• Completed
• Zoning
• Floodplain Study

26. Building Design and Construction Division 26
Schedule
• Next Steps
• Construction Documents (100%) Drawing Review – February 2016
• Bid Documents – May 2016
• Complete Permitting – August 2016
• Advertise/ Bid / Contract – Fall 2016
• Notice of Award to Contractor – December 2016
• Begin Construction – January 2017

27. Building Design and Construction Division 27
Schedule
• Phase II (January 2014-Winter 2017)
 Schematic Design (30%)
 Design Development (60%)
• Permitting (began March 2015)
• Land Acquisition (began September 2014)
• Construction Documents
• Bidding
• Phase III (Winter 2017-Spring 2019)
• Construction
Project Remains on Schedule

28. Building Design and Construction Division 28
Community Outreach

29. Building Design and Construction Division 29
Community Outreach

30. Building Design and Construction Division 30
Community Outreach
• Bi-annually
• Important Milestones
• Next Community meeting – July/ August 2016
Community Meetings

31. Building Design and Construction Division 31
Community Outreach
 Contact Information – Huntington Levee Project
 Phone #: 703-324-5800
 Email address: HuntingtonLevee@fairfaxcounty.gov
 Contact Information – Stormwater Questions
 Phone #: 703-324-5821
 Email address: SWPDmail@fairfaxcounty.gov
 Huntington Levee Website:
www.fairfaxcounty.gov/dpwes/huntingtonlevee
To request this document in an alternate format call 703-324-5800, TTY 711.