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District of Columbia Water and Sewer AuthorityGeorge S. Hawkins,
General Manager
December 13, 2012
Briefing on:
DC CLEAN RIVERS PROJECTNortheast Boundary and Branch Tunnels
Briefing for:
Special Joint Meeting of the Bloomingdale Civic Association,
SMD 5C04 and SMD 5C07
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Flooding Mitigation Measures
Clean Rivers Project Snapshot
First Street Tunnel Field Investigation
Agenda
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DC Water Short Term Efforts to Mitigate Basement andStreet
Flooding
Visual inspection of sewers
Rebate program for installing backflow preventers
Rain barrel-subsidy and installation program
Sandbag distribution
Analysis of plumbing and housing code
Flooding Mitigation Measures
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V St
W St
Adams St
Bryant St
U St
Thomas St
Michigan Ave
N
1st St N
.CapSt
Future 23 Dia.
Northeast Boundary
Tunnel (Long Term
recommendation)
McMillan Stormwater
Storage
6 mg Stormwater
Storage (3 mg from N.
Cap, 3 mg from First St)
First Street Tunnel
19 Dia tunnel, 2,800 ft
long, 6 mg storage
Temp.
Pumping
Station
Medium TermRecommendationsfor Bloomingdale &LeDroit Park
3 of 10 acres is needed
for construction
Fourrecommendations:
1. McMillan StormWater Storage
2. First St Tunnel
3. Rain BarrelProgram
4. GreenInfrastructure
Final Site for First Street
Storage and Tunnel Shaft
Site being coordinated
with District.
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Long Term Control Plan (LTCP) Control combined sewer overflows
(CSOs) Reduce flooding Meet nutrient discharge limits of
Chesapeake Bay Program
Schedule
LTCP = 20 years (2005-2025) Nitrogen = 2007-2015
Cost LTCP = $2.5 billion Nitrogen = $950 M
Total > $3.5 billion
Drivers Projects required to meet regulatory
requirements (NPDES Permit and ConsentDecree)
Flood Relief
Clean Rivers Project Snapshot
5
A Blue Plains Tunnel
C CSO 019 Overflow and Diversion Structures
D JBAB Overflow and Potomac Outfall Sewer DiversionE M Street
Diversion Sewer (CSOs 015, 016 and 017)
G CSO 007 Diversion Structure and Diversion Sewer
H Anacostia River Tunnel
I Main Pumping Station and Tingey Street Diversions
J Northeast Boundary and Branch Tunnels
Y Blue Plains Dewatering Pumping Station and ECF
Z Poplar Point Pumping Station Replacement
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Northeast Boundary and Branch Tunnels
Planned Boring Locations
Survey and utility locationwork to prepare for test
boringsSoil borings and
groundwater monitoring
Topographic survey
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Traffic ControlPlans for eachinvestigation sitealong the
alignmentwill be approved by
District Departmentof Transportation(DDOT).
Lane closures andshifts may occur.
Field Investigation Traffic Plans
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24-hour parkingrestrictions withinthe work zones.
Work hours will be
7:00 a.m. to 7:00p.m., MondaySaturday
Work at each sitewill takeapproximately 10business days.
Field Investigation Parking Restrictions
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Field Investigation Survey Work
There may be noiseand vibrationsduring drilling andsoil
sampling.
Surveyors willneed to takemeasurements onthe front stoops of
many homes.
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Geotechnical Investigation
Max. Sample Depth = 220 ft +
Below Ground Surface
Tunnel Depth = 45 ft to 150 ft
Below Ground Surface
First Street Tunnel
19-ft Inside Diameter
Drill Rig
DrillStringw/Sampler
Scale = 1 H : 1 V
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Public Outreach Program
DC Water is working to educate the community and minimize impact
of theinvestigative work and tunneling operations.
Outreach Efforts
Meetings with Councilmembers, ANCs and neighborhood groups
Project materials with details and contact information
Traffic advisories
Doorhangers to affected residents
DC Water website, listservs and Twitter
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Next Steps
DDOT/DCRA Permits Public Outreach Program
Field Work December 2012 June 2013
McMillan Storage Construction June 2013
March 2014
First Street Tunnel Construction 2014 2016
NEBT Tunnel Construction 2016 2022
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Questions?
Please contact:
DC Water Geotechnical Team Leader:Randy Lentell (202)
787-4450
DC Water 24-hr Emergency: (202) 612-3400
DC Water Office of External Affairs: (202) 787-2200
Email: [email protected]
Website: www.dcwater.com/cleanrivers
mailto:[email protected]://www.dcwater.com/cleanrivershttp://www.dcwater.com/cleanriversmailto:[email protected]
