Transcript What is a CSO?

District of Columbia Water and Sewer Authority
George 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 Are
The District of Columbia Water and Sewer Authority (DC Water)
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Provides
• Drinking water distribution for DC
• Required wastewater collection and
treatment
• Stormwater collection and conveyance
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Treats wastewater for a population of 2.1 million
• District of Columbia
• Montgomery & Prince George’s counties, MD
• Fairfax & Loudoun counties, VA
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Operates the world’s largest advanced wastewater
treatment plant
• Average daily capacity, 370 mgd
• Peak daily capacity, 1 billion+ gallons
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Serves a regional area of approx. 725 Sq Mi
Blue Plains Advanced Wastewater
Treatment Plant
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What is a CSO?
100% of Suburbs
67% of DC
0% of suburbs
33% of DC
DC Clean Rivers Project Overview
What is our Purpose?
 Control combined sewer overflows to the
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Potomac River
Anacostia River
Rock Creek
 Relieve flooding in the Northeast Boundary Area
 Implemented under a Federal Consent Decree among
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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 Milestones
for 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)
March 23, 2018
 Northeast Boundary Area Tunnels
(North of RFK Stadium)
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
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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
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CSO Reduction
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Number of Overflows Reduced:
• Anacostia:
75 to 2/yr
• Potomac:
74 to 4/yr
• Rock Creek:
30 to 4/yr
Reduced nitrogen
Bacteria levels will be lower, dissolved oxygen will be higher
Trash/Floatables Reduction
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98% Reduction in CSOs to Anacostia River
Water Quality Improvement
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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
Trash/floatables from CSOs will be practically eliminated
Flooding Relief in Northeast Boundary Area
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DC Clean Rivers Project Funding
 Federal Funding
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$153.6 million since September 30, 2011
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Working to get more funding
 Revenue from ratepayers
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Impervious Surface Charge
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Fiscal Year 2012 anticipated $302 million
 Wholesale Customers
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Customers in Maryland & Virginia pay approx. 7.1 percent on most of the
project
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Anacostia River Projects
Project Snapshot
 4 large storage/conveyance
tunnels
 Dewatering pumping station at
Blue Plains
 Pumping station replacement at
Poplar Point
 Schedule
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LTCP = 20 years (2005-2025)
Nitrogen = 2007-2015
 Cost
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LTCP = $2.6 billion
Nitrogen = $950 M
Total > $3.5 billion
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Anacostia River Tunnel
Overview
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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-019
Site Plan
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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-018
Site Plan
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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 Street
Site Plan
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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-007
Site Plan
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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-005
Site Plan
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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 Point
Site Plan
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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 Columbia
Water and Sewer Authority
5000 Overlook Ave, SW
Washington, DC 20032
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Questions?

011 – March 2012