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DC Water & Sewer Authority Projects Overview

Learn about DC Water's construction commitments, upcoming projects, and infrastructure upgrades for water, wastewater, and stormwater services.

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DC Water & Sewer Authority Projects Overview

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  1. District of Columbia Water and Sewer Authority George S. Hawkins, General Manager DBIA-MAR Monthly Luncheon Water Wastewater Design-Build Projects Hosted by: DC WATER Presenters: Gus G. Bass, DC Water Phillip Braswell, Brown and Caldwell Donal Barron, Greeley and Hansen Bo Bodniewicz, AECOM July 17, 2012

  2. Introduction to DC Water and Sewer Authority (DC Water) 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. Blue Plains Service Area Dulles International Airport Sewer Blue Plains Wastewater Treatment Plant

  4. Past Construction Dollars Committed • From 2006 to Present (June 1, 2012), DC Water committed more than $2.2 Billion for construction projects in the areas of: • Blue Plains upgrades and improvements • Combined sewer over-flow, outfall rehabilitation, and pumping station projects • Sanitary pumping facilities and trunk sewer upgrades • Water distribution and water facility upgrades Construction crews install a large diameter water main

  5. Projected DC Water CIP Commitments for Construction, FY 2012 – FY 2016 • Wastewater Treatment – $1.3B, including • Biosolids – $142M • Enhanced Nitrogen Removal and Other Associated Site Work – $119M • Liquid processing – $128M • Plant wide – $26M • Sanitary Sewer – $269M • CSO/LTCP – $324M • Stormwater – $11M • Water – $235M Our Capital Improvement Program (CIP) for the next 10 years is valued at $4 billion, and over the next 20 years, $8.2 billion.

  6. The Next Several Slides Detail Upcoming Construction Projects at Blue Plains and Throughout the District of Columbiafor FY2012 through FY 2016

  7. Blue Plains Service • Design and construct projects that will rehabilitate, upgrade, or provide new facilities at Blue Plains as well as to meet its National Pollutant Discharge Elimination System (NPDES) permit requirements • Reduce biosolids odors, both on site and in the final product leaving the plant • Projects: • Enhanced Total Nitrogen Removal • Biosolids Management • Blue Plains Tunnel Construction • Other Plant-wide Upgrades Estimated Construction Value FY2012 – FY2016 $410 – $420 million

  8. Sanitary Sewer Service • System includes 600 miles of large interceptor sewers and smaller gravity collection sewers • Continue to assess condition of sanitary sewer system • Projects include: • Rehabilitation and replacement of sewers • Minimize infiltration / inflow Estimated Construction Value FY2012 – FY2016 $150 – $270 million

  9. Combined Sewer Overflow Service • Reduce overflow by a projected 96 to 98 percent • Improve water quality • Reduce debris in our local waterways • Upgrade pumping stations to increase their pumping capacity • Develop and construct projects to control wet weather related pollution Estimated Construction Value FY2012 – FY2016 $536 – $618 million

  10. Stormwater Service • Replace undersized, aging, or deteriorated storm sewers • Projects include • Extensions to the system • Relief of certain storm sewers • Rehabilitate or replace structurally deteriorating storm sewer systems Estimated Construction Value FY2012 – FY2016 $10 – $15 million

  11. Water Service • Design and construction projects that maintain water quality, improve water pressure, and provide reliable fire protection • System includes approximately • 1,300 miles of pipe • 36,000+ valves of various sizes • 9,000 fire hydrants • Projects: Rehab & replacement of • water mains • storage facilities • pumping stations • Continued replacement of house services (lead, copper, or galvanized) and service meters Estimated Construction Value FY2012 – FY2016 $140 – $240 million

  12. DC Water Large Projects In addition to our CIP, larger projects that have started and will continue over the next several years include: • Biosolids • Clean River Projects (Long Term CSO Control Plan) • Tunnel Dewatering Pumping Station and Enhanced Clarification Facility

  13. BIOSOLIDS PRESENTED BY Phil Braswell

  14. Blue Plains Advanced Wastewater Treatment Plant (August 2010)

  15. Blue Plains Advanced Wastewater Treatment Plant (July 2012)

  16. Biosolids Management Program • Updated Biosolids Management Plan (December 2008) • Produce Class A product using thermal hydrolysis • Reduce quantity of biosolids shipped off-site • Use biogas generated to produce steam and power • Control capital and program costs • Implement by January 2015

  17. DBB ($6.0M) Emissions DBO ($83M) Gravity Thickeners Program Components & Delivery Methods Site Preparation Biogas Treatment and CHP Electricity Steam DB ($208M) DBB ($78M) Biogas R Mesophilic Anaerobic Digestion Pre- Dewatering Thermal Hydrolysis Class A Loadout Final Dewatering DAFTs R Recycle Processing R Lime R Dewatering Mix Store & Loadout Class B R

  18. Program Components & Delivery Methods • All projects delivered and are under construction • Increase from 2010 = $42M • FDF – scope increase ($44M-$78M) • Schedule got tighter • CHP – PES costs for design and construction and mark-up undervalued • Undervalued long term cost

  19. Reasons for Considering Alternative Delivery – 2010 Program • Schedule • Improved coordination • Potential innovation • Digester construction • Construction sequencing • Interface coordination • CHP not part of DC Water expertise • How is it working out? 2012

  20. Schedule • 2008 Facility Plan suggested January 2014 • PM Contract 2009 • Scope Confirmation – late 2009 • New Dewatering Facility – went traditional DBB • Alternative Delivery Bumps • New regulations • Survey of contractors/engineers • How to deal with Cambi (9 months) • 30% design (CHP and MPT) • New type contract • CHP Financial Model • Air Permit • Construction w/o 100% design  Alternative Delivery saved time

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