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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
2
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 Mi
Blue Plains Advanced Wastewater Treatment Plant
3
100% of Suburbs67% of DC
0% of suburbs33% of DC
What is a CSO?
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
5
DC Clean Rivers Project Schedule
Consent Decree Requirements
Principal Consent Decree Milestonesfor Anacostia River CSO Control
ProjectsConsent 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
6
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
7
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
9
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
10
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
11
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 Facility13
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
14
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
15
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
16
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
17
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 ScheduleEvent 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
19
Contact Us
For more information about today’s presentation, email:
• Emanuel Briggs; emanuel.briggs@dcwater.com For periodic program updates, visit us online at:
• www.dcwater.com/workzones/projects/cleanrivers.cfm
District of ColumbiaWater and Sewer Authority
5000 Overlook Ave, SWWashington, DC 20032
20
Questions? 011 – March 2012
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