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 Mi

Blue Plains Advanced Wastewater Treatment Plant

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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

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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

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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 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

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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 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

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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

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Questions? 011 – March 2012