Stormwater Wastewater Consolidation May 23, 2017

1. Building Design and Construction Division
Stormwater Wastewater Consolidation
May 23, 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
– Background
– Study Process
– Existing Conditions
– Outdoor Lighting
– Wetlands & RPA Analysis
– Concept Options
– Noise Impact Analysis
– Traffic Impact Analysis
– Next Steps
• Questions and Answers

3. Building Design and Construction Division
Background
3
Stormwater Wastewater Consolidation
Project Overview
• New Stormwater Wastewater Consolidation Facility
• 23.7 Acre Site – Sites 11 & 13
SITE 13
WCD Property
SITE 11
Concrete Plant site

4. Building Design and Construction Division
Background
4
Stormwater Wastewater Consolidation
Stormwater Planning Division (SWPD):
• Oversees the MS4 (Municipal Separate Stormwater Sewer System) permit, stream monitoring programs,
and stormwater project designs.
Maintenance and Stormwater Management Division (MSMD):
• Maintains over 1,300 miles of stormwater conveyance system, about 2,000 County owned stormwater
management facilities, inspects and enforces about 4,000 private stormwater management facilities, and
maintains County-owned trails, sidewalks, pedestrian bridges, public street name signs and designated
transportation facilities and snow removal at County facilities.
Wastewater Collection Division (WCD):
• The county’s wastewater collection and conveyance system includes more than 3,330 miles of sanitary
sewer lines, 65 pumping stations, and 57 flow metering stations. The county monitors these components
and provides a 24-hour trouble response service for sewer backups.
Department of Public Works and
Environmental Services (DPWES)
Stormwater Planning
Division (SWPD)
Maintenance and
Stormwater
Management
Division (MSMD)
Wastewater
Collection Division
(WCD)

5. Building Design and Construction Division
Background
5
Stormwater Wastewater Consolidation
SWPD
Government Center
• New MS-4 regulations
will require staff growth
• No space to
accommodate staff
increase
• Off site ecology testing
lab
MSMD
West Drive
• Aging buildings and
infrastructure
• No expansion capability
• Inadequate storage
• Inadequate parking
• Need for improved
emergency response
capability
WCD
Freds Oak Road
• Facility is over 35 years
old
• Building systems need
upgrade
• No space to
accommodate staff
increase
Benefits of Consolidated Facility
• Building and Site Efficiencies
• Operational Efficiencies
• Addresses Space Deficiencies for SWPD, MSMD and WCD
• Addresses Renovations and Capital Renewal Requirements for WCD
• Provides for a centrally located Site that accommodate Program Size
• Consolidate Three Integrated Services on One Centrally Located Site

6. Building Design and Construction Division
Study Process
6
Stormwater Wastewater Consolidation
SITE SELECTION
Initial consolidation
between SWPD and
MSMD
Several sites
evaluated
WCD inclusion into
consolidation
WCD/Freds Oak site
was selected
SPACE
PROGRAMMING
Forecasted Yr2017
to Yr2037 staff and
equipment
Calculated storage
yard requirements
Validated site
selection findings
CONCEPT
OPTIONS
Topographic and
boundary surveys
Planning workshop
Stakeholder inputs
Circulation, utilities
and building
configuration
concepts.
SCHEMATIC AND
DETAILED
DESIGN
2232 Review Process
Traffic, noise,
wetlands and
environmental surveys
Public input
VDOT and agency
input
Refined concept for
detailed design
Construction
documents and cost
estimates
CONSTRUCTION
AND
DEVELOPMENT
Budgetting
Permitting
Phasing
Construction
Commissioning

7. Building Design and Construction Division
Concept Options: Space Program Results
7
Stormwater Wastewater Consolidation
Program Area
Office and Support Areas 96,500 SF
Shops 29,000 SF
Warehouse 18,250 SF
Vehicle Wash Facility 4,300 SF
Covered Fuel Pump 3,500 SF
Covered Material Storage 18,300 SF

8. Building Design and Construction Division
Existing Conditions
8
Stormwater Wastewater Consolidation
Parcel 11: 9.3 acres
Parcel 13: 14.4 acres
Total: 23.7 acres
Parcel 13 Zone I-5
Parcel 11 Zone I-6

9. Building Design and Construction Division
Existing Conditions
9
Stormwater Wastewater Consolidation
SITE 11 SITE 13

10. Building Design and Construction Division
Existing Conditions: Zoning Compliance
10
Stormwater Wastewater Consolidation

11. Building Design and Construction Division
Outdoor Lighting
11
Stormwater Wastewater Consolidation
• Fairfax County outdoor
lighting standards
designed to:
– Reduce the impacts of
glare, light trespass and
overlighting.
– Promote safety and
security.
– Encourage energy
conservation.
The Ordinance requires the use of full cutoff lighting
fixtures for all walkways, parking lots, canopy and
building/wall mounted lighting and all lighting fixtures.
Fixtures adjacent to residentially zoned properties must
conform to fixed mounting heights and provide
supplemental opaque shielding to further reduce glare.

12. Building Design and Construction Division
Concepts – Option 1
12
Stormwater Wastewater Consolidation

13. Building Design and Construction Division
Concepts – Option 2
13
Stormwater Wastewater Consolidation

14. Building Design and Construction Division
Concepts – Option 3
14
Stormwater Wastewater Consolidation

15. Building Design and Construction Division
Wetlands and RPA Analysis
15
Stormwater Wastewater Consolidation
• No impact to
RPA
• Only minor
impacts to
wetlands/
streams if
needed for
stormwater
outfalls

16. Building Design and Construction Division
Noise Impact Analysis
16
Stormwater Wastewater Consolidation
Truck Noise
Location
Measured
Ambient
Noise,
Ldn, dBA
Combined
Noise Levels,
Ldn dBA
Increase in
Noise Levels,
dB
M1 59 60 1
M2 50 51 1
M3 51 53 2
M4 56 69 13
M5 70 70 0
M6 55 55 0

17. Building Design and Construction Division
Noise Impact Analysis
17
Stormwater Wastewater Consolidation
Vactor Back Motor
-Fairfax County Noise Ordinance:
-Maintenance and cleaning is exempted between
7:00 am to 9:00 pm, limited to 90 dBA.
-Occasional maintenance and cleaning will only
be performed during daytime hours.

18. Building Design and Construction Division
Noise Impact Analysis
18
Stormwater Wastewater Consolidation
Backup Alarm
-Fairfax County Noise Ordinance, impulse noise:
-100 dBA Daytime
-80 dBA Nighttime
-Alarm is very directional.
-Noise Ordinance will not be exceeded.

19. Building Design and Construction Division
Traffic Impact Analysis
19
Stormwater Wastewater Consolidation
What is a Traffic Impact Analysis?
VDOT requires a traffic study to determine the
transportation network impacts of land
development.
How does the study determine the impacts?
Comparison of:
Existing conditions to
Future Conditions to
Future Site Improvement conditions

20. Building Design and Construction Division
Study area
Explanation of study area Lane movements with
LOS E or worse
Traffic Impact Analysis – Existing Conditions
20
Stormwater Wastewater Consolidation
N
LOS
6:30 – 7:30AM: B
7:30 – 8:30AM: D
4:00 – 5:00PM: A
LOS
6:30 – 7:30AM: A
7:30 – 8:30AM: A
4:00 – 5:00PM: A
LOS
6:30 – 7:30AM: F
7:30 – 8:30AM: E
4:00 – 5:00PM: E
LOS
6:30 – 7:30AM: F
7:30 – 8:30AM: F
4:00 – 5:00PM: F

21. Building Design and Construction Division
Traffic Impact Analysis – Build Trips and Distribution
21
Stormwater Wastewater Consolidation
Study area
Explanation of study area N
Peak Hour In Out
6:30 - 7:30 AM 242 147
7:30 - 8:30 AM 18 41
4:00 - 5:00 PM 27 255

22. Building Design and Construction Division
Traffic Impact Analysis
22
Stormwater Wastewater Consolidation
Staff personal vehicle distribution scenarios
COUNTY TRUCKS CAN ONLY EXIT VIA FREDS OAK RD.
(NO COUNTY TRUCKS ON OTHER NEIGHBORHOOD STREETS)
Scenario 1: Staff personal vehicles exit using Freds Oak Rd/Fairfax Co.
Pkwy intersection
Scenario 2: North and West bound staff personal vehicles exit using Clara
Barton Drive
Scenario 3: All staff personal vehicles exit using Clara Barton Drive

23. Building Design and Construction Division
Traffic Impact Analysis – Clara Barton & Freds Oak Traffic
23
Stormwater Wastewater Consolidation
Study area
Explanation of study area NPersonal Staff Vehicles Exiting Via Clara Barton Drive
Peak Hour Scenario 1 Scenario 2 Scenario 3
6:30 - 7:30 AM 0 13 37
7:30 - 8:30 AM 0 0 1
4:00 - 5:00 PM 0 89 255
Personal Staff Vehicles Exiting Via Freds Oak Rd
Peak Hour Scenario 1 Scenario 2 Scenario 3
6:30 - 7:30 AM 37 24 0
7:30 - 8:30 AM 1 0 0
4:00 - 5:00 PM 255 166 0

24. Building Design and Construction Division
Traffic Impact Analysis – Alternatives
24
Stormwater Wastewater Consolidation
• Improves operations
• Prohibits left and through movements
Channelized Right Turn at Fairfax Co. Pkwy & Freds Oak Road

25. Building Design and Construction Division
Traffic Impact Analysis – Alternatives
25
Stormwater Wastewater Consolidation
New Traffic Signal at Fairfax Co. Pkwy & Freds Oak Road
• Dedicated phases for side-street traffic
• New pedestrian crossing of Fairfax Co. Pkwy.
• Does not meet traffic signal spacing standard
• Requires VDOT Approval

26. Building Design and Construction Division
Traffic Impact Analysis – Alternatives
26
Stormwater Wastewater Consolidation
Modify Traffic Signal at Clara Barton Dr. and Ox Rd.
• Only needed for Scenarios 2 or 3
• Similar operations (LOS) as No-Build

27. Building Design and Construction Division
Next Steps
27
Stormwater Wastewater Consolidation
• Address Public Comments
• Refine Concepts
• 2232 Approval

28. Building Design and Construction Division
Questions and Answers
28
Stormwater Wastewater Consolidation
Thank you!