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District of Columbia Water and Sewer AuthorityGeorge S. Hawkins, General Manager
Briefing On:
Anacostia River Tunnel Briefing For:
ANC 6B
October 26, 2011
Agenda
� Welcome and Introductions
� DC Water Organization and DC Clean Rivers Project (DCCR) Overview
� Importance of the Anacostia River
� Anacostia River Tunnel (ART) Project Overview
� Next Steps
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Who We AreThe District of Columbia Water and Sewer Authority (DC Water)
� Provides
• Drinking water distribution for DC
• Required wastewater collection and treatment
• Stormwater collection and conveyance
� Treats wastewater for a population of 2.1 million
• District of Columbia
• Montgomery & Prince George’s counties, MD
• Fairfax & Loudoun counties, VA
� Operates the world’s largest advanced wastewater treatment plant
• Average daily capacity, 370 mgd
• Peak daily capacity, 1 billion+ gallons
� Serves a regional area of approx. 725 Sq MiBlue Plains Advanced Wastewater
Treatment Plant
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100% of Suburbs
67% of DC
0% of suburbs
33% of DC
What is a CSO?
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DC Clean Rivers Project OverviewWhat is our Purpose?
� Control combined sewer overflows to the
• Potomac River
• Anacostia River
• Rock Creek
� Relieve flooding in the Northeast Boundary Area
� Implemented under a Federal Consent Decree among
• US Environmental Protection Agency (US EPA)/
US Department of Justice (US DOJ)
• District of Columbia and
• DC Water
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DC Clean Rivers Project Schedule Consent Decree Requirements
Principal Consent Decree Milestonesfor Anacostia River CSO Control Projects
Consent Decree Effective March 23, 2005
Submit Facility Plan (Complete) September 23, 2008
Start Design (Complete) March 23, 2009
Start Construction (Complete)* March 23, 2012
Place in Operation
• River Area Tunnels (South of RFK Stadium)
• Northeast Boundary Area Tunnels (North of RFK Stadium)
March 23, 2018
March 23, 2025
* Construction began in February 2010 with the Division W – Blue Plains Site Preparation Contract
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DC Combined Sewer System
� 1/3 of DC area is served by combined sewers (12,478 acres)
� 53 CSO outfalls
• 15 to Anacostia
• 10 to Potomac
• 28 to Rock Creek
� Three receiving waters
• Anacostia River
• Potomac River
• Rock Creek
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Importance of the Anacostia River
� Anacostia – Native American Word (Anaquash) meaning village trading center
� Wetland loss, deforestation, and urbanization have significantly degraded the water quality of the Anacostia River
� Tidal waters flow 8.4 miles
� Joins Potomac at Hain’s Point for 108 miles
� Empties into the Chesapeake Bay
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Environmental Benefits of the DC Clean Rivers Project� CSO Reduction
• 96% Reduction in CSO Volume:
• Anacostia: 2,142 to 54 mil gal/yr
• Potomac: 1,063 to 79 mil gal/yr
• Rock Creek: 49 to 5 mil gal/yr
• Number of Overflows Reduced:
• Anacostia: 75 to 2/yr
• Potomac: 74 to 4/yr
• Rock Creek: 30 to 4/yr
� Water Quality Improvement
• Reduced nitrogen
• Bacteria levels will be lower, dissolved oxygen will be higher
� Trash/Floatables Reduction
• Trash/floatables from CSOs will be practically eliminated
� Flooding Relief in Northeast Boundary Area
98% Reduction in CSOs to Anacostia River
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DC Clean Rivers Project Funding
� Federal Funding
• $153.6 million since September 30, 2011
• Working to get more funding
� Revenue from ratepayers
• Impervious Surface Charge
• Fiscal Year 2012 anticipated $302 million
� Wholesale Customers
• Customers in Maryland & Virginia pay approx. 7.1 percent on most of the
project
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Anacostia River ProjectsProject Snapshot
� 4 large storage/conveyance tunnels
� Dewatering pumping station at Blue Plains
� Pumping station replacement at Poplar Point
� Schedule• LTCP = 20 years (2005-2025)• Nitrogen = 2007-2015
� Cost• LTCP = $2.6 billion• Nitrogen = $950 M• Total > $3.5 billion
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Anacostia River TunnelOverview
� 23-foot diameter TBM tunnel
� Soft ground
� 100 ± feet deep and 12,500 feet long
� Mining from CSO-019 south to PP-JS
� 6 shafts (12 to 75-foot I.D.)
� 3 Adits (4.5 to 10-foot I.D.)
� 2 Diversion Structures
� 6 Odor Control and Venting Facilities
� Monitoring & Data Collection System
� System Start-up
� Design-build contract value: $200 – $250 million
CSO-019
CSO-018
M Street
CSO-007
CSO-005
PP-JS
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CSO-019Site Plan
� NPS property
� CSA: 3.75 Acres
� Two 75-foot ID shafts; ±105 feet deep to top of invert
� 100-foot long Inter-Shaft Connector Tunnel
� Odor Control and Venting Facility: Eastside Pumping Station
� Internal Hydraulic Structures in South Shaft
� Contractor interfaces
• CSO-019 Diversion and Overflow Facility
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CSO-018Site Plan
� DDOT property
� CSA: 1.25 Acres
� 32-foot ID shaft; ±95 feet deep to top of invert
� 300-foot long, 10-foot ID adit
� Diversion Structure
� Odor Control and Venting Facility
� Internal Hydraulic Structures within Shaft
� Crossings: CSX Tracks and DDOT Retained Ramp
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M StreetSite Plan
� DMPED property
� CSA: 1 Acre
� 62.5-foot ID shaft; ±110 feet deep to top of invert
� Odor Control and Venting Facility
� Internal Hydraulic Structures within Shaft
� Contractor interfaces
• M Street Diversions
• DMPED Development
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CSO-007Site Plan
� DDOT property
� CSA: 2 Acres
� 12-foot ID shaft; ±100 feet deep to top of invert
� 30-foot long, 4.5-foot ID adit
� Diversion Structure
� Odor Control and Venting Facility
� Internal Hydraulic Structures within Shaft
� Contractor interfaces
• 11th Street Bridge
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CSO-005Site Plan
� NPS property
� CSA: 0.75 Acres
� 12-foot ID shaft; ± 105 feet deep to top of invert
� 20-foot long, 4.5-foot ID adit
� Diversion Structure
� Odor Control and Venting Facility
� Internal Hydraulic Structures within Shaft
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Poplar PointSite Plan
� DDOT property
� CSA: 0.80 Acres
� Internal Hydraulic Structures within Shaft
� Contractor interfaces
• Blue Plains Tunnel
• Poplar Point Pumping Station Replacement
• DDOT South Capitol
Street Project.
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ART Estimated Schedule
Event Date
Issue RFQ ���� November 2011
Receive SOQ’s ���� January 2012
Shortlist ���� January 2012 – April 2012
Issue RFP ���� April 2012
Collaboration period ���� April 2012 – Dec 2012
Receive proposals ���� Dec 2012
Notice to proceed ���� June 2013
Occupy site ���� November 2013
Substantial Completion ���� June 2017
Final Completion ���� September 2017
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Contact Us
� For more information about today’s presentation, email:
• Emanuel Briggs; [email protected]
� For periodic program updates, visit us online at:
• www.dcwater.com/workzones/projects/cleanrivers.cfm
District of ColumbiaWater and Sewer Authority5000 Overlook Ave, SWWashington, DC 20032
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Questions?
� 011 – March 2012
