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District of Columbia Water and Sewer AuthorityDavid Gadis, Chief Executive Officer
March 18, 2020
Clean Rivers Project Northeast Boundary Tunnel
Briefing forCommissioner Ryan Linehan, 5D01
1
Northeast Boundary Tunnel Construction Team
DC Water’s Clean Rivers Project
Salini Impregilo Healy Joint Venture
and
2
Tunnel System Status OperationDate
First Street Tunnel
In Operation 2016
Blue Plains Tunnel
In Operation 2018
Anacostia River Tunnel
In Operation 2018
Northeast Boundary Tunnel
Construction 2023
Potomac River Tunnel
Planning 2030
• DC Clean Rivers Project: $2.7 Billion• Nitrogen Removal: $950 Million• Total > $ 3.5 Billion• 25 yr implementation (2005 – 2030)• 96% reduction in CSOs & flood relief in Northeast Boundary• Approx 1 million lbs/yr nitrogen reduction predicted
Clean Rivers Project and Nitrogen Removal Programs
Clean Rivers Project
3
Anacostia River Tunnel System Performance to Date
Trash and debris removed from CSO captured by tunnel at ECF Fine Screens
April 2018 November 2018
Approximately 7.2 billion gallons captured to date
Nearly 3,300 tons of trash, debris, and other solids captured
Exceeding predicted capture rate (90%>80%)
First year in operation was the wettest year on record for the District of Columbia
4
Northeast Boundary Tunnel – Problem
Before 1st St Tunnel
Chance of flood occurring in any given year
5
4TH ST CONSTRUCTION
SITE
MICHIGAN AVE CONSTRUCTION
SITE
CHANNING ST CONSTRUCTION
SITE
PUMPING STATION AND T ST
CONSTRUCTION SITES
R ST CONSTRUCTION
SITE
RHODE ISLAND AVE CONSTRUCTION SITE
W ST CONSTRUCTION
SITE
MT OLIVET RD CONSTRUCTION
SITES
CSO 019 CONSTRUCTION
SITE
Construction site
Construction site with Diversion Facility
Chronic flood area
Northeast BoundaryTunnelFirst Street Tunnel
1
2
FLORIDA AVE CONSTRUCTION
SITE
3
46
Northeast Boundary TrunkSewer
On average, CSO events will be reduced to two per year.
NO
RTH
CAP
ITO
LST
MICHIGAN AVENE
7TH
STN
W
E CAPITOL STNE
E CAPITOL STNE
C ST NE
17TH
STN
E
INDEPENDENCE AVESE
19TH
STSE
R STNW
1ST
STN
W
T ST NE
4TH
STN
E
W STNE
6TH
STN
W
B R
M I
Construction of diversionfacility along First Street NW
Northeast Boundary Tunnel – Solution
Northeast Boundary Tunnel at a Glance 5 Miles in length Approximately 100 feet below ground Tunnel constructed using a Tunnel Boring Machine
(TBM) –• A TBM is an underground machine that cuts
through the soil and assembles a reinforced concrete liner as it moves forward
Tunnel Benefits
Significantly mitigate the frequency, magnitude and duration of sewer flooding and basement backups in the Northeast Boundary drainage area
Control CSO discharges to the Anacostia River, significantly improving water quality
Minimize the nuisance and economic costs associated with flooding
Reduce risks to human health
6
What Are We Building?
7
Mount Olivet Road NE Construction Site
Schedule* Work HoursStart Finish Start FinishApril2019
Fall2022 7:00 AM 7:00 PM
Dates are approximate and subject to change as construction progresses
There are two construction staging areas on Mount Olivet Road NE: Department of Public Works (DPW) parking lot on Mount Olivet Road; and the intersection of Mount Olivet Road and Capitol Avenue NE
In order to relieve chronic sewer flooding, DC Water will construct a diversion facility which will include a diversion chamber, a 25-foot diameter drop shaft and other structures to convey flow from the existing sewer to the tunnel.
8
Mount Olivet Road NE Construction SiteTraffic Patterns and Pedestrian Detour
MOUNT OLIVET ROAD NE
IMPACTS: Pedestrian detour between Trinidad Avenue NE & Montello Avenue NE
DURATION: Anticipated through end of construction
Dates are approximate and subject to change as construction progresses
9
Contact Us
Email: [email protected] 24/7 Hotline: 800-988-6151 Northeast Boundary Tunnel Project webpage:
dcwater.com/nebt