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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

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slide1

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
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
who we are the district of columbia water and sewer authority dc water
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

what is a cso
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
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
dc clean rivers project schedule consent decree requirements
DC Clean Rivers Project Schedule Consent Decree Requirements

* Construction began in February 2010 with the Division W – Blue Plains Site Preparation Contract

dc combined sewer system
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
importance of the anacostia river
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
environmental benefits of the dc clean rivers project
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

dc clean rivers project funding
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
anacostia river projects project snapshot
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
anacostia river tunnel overview
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

cso 019 site plan
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
cso 018 site plan
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
m street site plan
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
cso 007 site plan
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
cso 005 site plan
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
poplar point site plan
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.
contact us
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 Columbia

Water and Sewer Authority

5000 Overlook Ave, SW

Washington, DC 20032

questions
Questions?
  • 011 – March 2012