The document discusses a proposed new stormwater and wastewater consolidation facility and its potential traffic impacts. It outlines different traffic scenarios and options to address traffic concerns, including restricting left turns during peak hours and adding a right turn lane. Traffic analyses project traffic levels in 2037 and compare delays and queue lengths under different scenarios. The presentation seeks public feedback on the project.

1. Building Design and Construction Division
Stormwater and Wastewater Consolidation
October 30, 2017

2. Building Design and Construction Division
Agenda
2
Stormwater Wastewater Consolidation
• Welcome – Braddock District Supervisor, John Cook
• Introduction – James Patteson, Director, DPWES
• Project Overview
• Transportation
• Questions and Answers

3. Building Design and Construction Division
Background
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Stormwater Wastewater Consolidation
Project Overview
• New Stormwater and Wastewater Consolidation Facility
• 23.7 Acres Total – Wastewater Collection Division Site & Concrete Plant Site

4. Building Design and Construction Division
Traffic Impact Analysis – Facility Exit
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Stormwater Wastewater Consolidation
New Facility Exit: Channelized
Right Turn
Existing Facility Exit: Facility
Policy on No Left Turn

5. Building Design and Construction Division
Stormwater Wastewater Consolidation
Staff & Vehicle Projections
5
Current
2017
Total
Projected to 2037
Personal Vehicles County Vehicles Personal Vehicles County Vehicles
280 189 346 233
20 Year Projection - 2037

6. Building Design and Construction Division
Traffic Impact Analysis
6
Stormwater Wastewater Consolidation
Guidelines
• All County vehicles enter and exit via Freds Oak Rd to Fairfax County Parkway
• Per VDOT: A traffic signal will NOT be installed on Fairfax County Parkway
• Traffic Analysis on a 20 year projected growth (year 2037)
• Recommendations are based on peak hour projections
Scenario A
• All site vehicles (County and personal) use Freds Oak Rd to Fairfax County
Parkway
Scenario B
• All County vehicles and a percentage of personal vehicles use Freds Oak Rd to
Fairfax County Parkway

7. Building Design and Construction Division
Traffic Impact Analysis – 2037 AM Site Traffic
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Stormwater Wastewater Consolidation
AM Peak traffic hours for roadway network vs proposed site:
Trip Gen all vehicles (outs = county vehicles)
Peak Hour
5:00 to 6:00 AM:
6:00 to 7:00 AM:
7:00 to 8:00 AM:
8:00 to 9:00 AM:
Analysis
Hours
Maximum
126 in, 0 out
145 in, 147 out
62 in, 8 out
9 in, 11 out
Roadway AM Peak Hour – 7:45 to 8:45 AM
Expected
101 in, 0 out
116 in, 63 out
50 in, 3 out
7 in, 5 out

8. Building Design and Construction Division
Traffic Impact Analysis – 2037 PM Site Traffic
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Stormwater Wastewater Consolidation
PM Peak traffic hours for roadway network vs proposed site:
Trip Gen all vehicles (in = county vehicles)
Peak Hour
2:00 to 3:00 PM:
3:00 to 4:00 PM:
4:00 to 5:00 PM:
5:00 to 6:00 PM:
Maximum
128 in, 126 out
4 in, 140 out
0 in, 62 out
0 in, 9 out
Roadway PM Peak Hour – 5:00 to 6:00 PM
Expected
55 in, 100 out
3 in, 104 out
0 in, 27 out
0 in, 4 out
Analysis
Hours

9. Building Design and Construction Division
Traffic Impact Analysis – Options
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Stormwater Wastewater Consolidation
Option 1: New Traffic Signal at Fairfax Co. Pkwy & Freds Oak Road
• Based on discussions with VDOT
• Interchange spacing standards

10. Building Design and Construction Division
Traffic Impact Analysis – Freds Oak Rd. Options
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Stormwater Wastewater Consolidation
Option 2: Left Turn Restrictions to FF Co Pkwy during Peak Traffic Hours
• Improves operations
• Prohibits left turns during peak hours

11. Building Design and Construction Division 11
Stormwater Wastewater Consolidation
• Improves operations
• Prohibits left and through movements
Traffic Impact Analysis – Freds Oak Rd. Options
Option 2A: 24-hour Left Turn Restrictions to FF Co Pkwy

12. Building Design and Construction Division 12
Stormwater Wastewater Consolidation
Option 3: New Right Turn Lane at Fairfax Co. Pkwy & Freds Oak Road
Traffic Impact Analysis – Freds Oak Rd. Options
• Improved operations for right turns
• Left and thru movements still experience high delay

13. Building Design and Construction Division
Traffic Impact Analysis – Clara Barton Dr. Options
13
Stormwater Wastewater Consolidation
Option 4: Modify Traffic Signal at Clara Barton Dr. and Ox Rd.
• Only applies to Scenario B
• Similar operations to No-Build
• Minimal Right of Way impacts

14. Building Design and Construction Division
Traffic Impact Analysis – Clara Barton Dr. Options
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Stormwater Wastewater Consolidation
Option 5: Modify Approach to Signal at Clara Barton Dr. and Ox Rd.
• Only applies to Scenario B
• Improves approach to
traffic signal

15. Building Design and Construction Division
Traffic Impact Analysis – Freds Oak Road/FF Co Pkwy
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Stormwater Wastewater Consolidation
2037 Delay (seconds/vehicle)
Right-Turn Lane Left-Turn Lane Right-Turn Lane Left-Turn Lane
AM Peak Hour
(6-7 AM)
34 44 41 108 Same as Scenario A
AM Peak Hour
(7-8 AM)
166 48 45 647 Same as Scenario A
PM Peak Hour
(2-3 PM)
87 31 25 285 28 25 182
PM Peak Hour
(3-4 PM)
417 114 67 1079 83 62 651
PM Peak Hour
(4-5 PM)
742 158 92 1653 113 83 1082
Scenario B
County Veh to Fred's Oak/FF Co Pkwy
Personal Veh to Fred's Oak/FF Co Pkwy &
Clara Barton/Ox Rd
Restricted
Left Turns
Construct New Right-Turn Lane
Peak Hour
Restricted
Left Turns
Construct New Right-Turn Lane
Scenario A
All site traffic to Fred's Oak/FF Co Pkwy
No-Build
(Baseline)
Additional queue analysis conducted

16. Building Design and Construction Division
Traffic Impact Analysis – Freds Oak 4-5 PM Queue
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Stormwater Wastewater Consolidation
PM 2037 No Build:
8 vehicles in queue = 200 feet queue length
PM Existing:
5 vehicles in queue = 125 feet queue length
PM 2037 Build
All Traffic to Freds Oak/FF Co Pkwy
Restricted Left Turns
7 vehicles in queue = 175 feet queue length
PM 2037 Build
All Traffic to Freds Oak/FF Co Pkwy
New Right-Turn Lane
5 vehicles in queue = 125 feet queue length

17. Building Design and Construction Division
Traffic Impact Analysis – Clara Barton Dr./Ox Rd.
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Stormwater Wastewater Consolidation
2037 Delay (seconds/vehicle)
Scenario A
All site traffic to Fred's Oak/FF Co Pkwy
Scenario B
County Veh to Fred's Oak/FF Co Pkwy
Personal Veh to Fred's Oak/FF Co Pkwy &
Clara Barton/Ox Rd
Signal Modifications Signal Modifications
AM Peak Hour
(6-7 AM)
61 No impacts from site traffic No impacts from site traffic
AM Peak Hour
(7-8 AM)
56 No impacts from site traffic No impacts from site traffic
PM Peak Hour
(2-3 PM)
69 No impacts from site traffic 38
PM Peak Hour
(3-4 PM)
68 No impacts from site traffic 38
PM Peak Hour
(4-5 PM)
72 No impacts from site traffic 42
Peak Hour
No-Build
(Baseline)
Additional queue analysis conducted

18. Building Design and Construction Division
Traffic Impact Analysis – Clara Barton 4-5 PM Queue
18
Stormwater Wastewater Consolidation
PM 2037 No Build:
5 vehicles in queue = 125 feet queue length
PM Existing:
4 vehicles in queue = 100 feet queue length
PM 2037 Build
County Vehicles to Freds Oak/FF Co Pkwy
Signal Modifications
4 vehicles in queue = 100 feet queue length – EACH LANE

19. Building Design and Construction Division
Traffic Impact Analysis
19
Stormwater Wastewater Consolidation
Questions?
Comments?

20. Building Design and Construction Division
Feedback Resources
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Stormwater Wastewater Consolidation
Direct e-Mail
Braddock@fairfaxcounty.gov
Tiya.Raju@fairfaxcounty.gov (Tiya Raju- Fairfax County DPWES Project Manager)
Project Website:
http://www.fairfaxcounty.gov/dpwes/c
onstruction/consolidating-
management-programs-one-
location.htm

21. Building Design and Construction Division
Traffic Impact Analysis
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Stormwater Wastewater Consolidation
Thank You