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

2. 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. 3 Blue Plains Service Area Blue Plains Wastewater Treatment Plant Dulles International Airport Sewer

4. 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. 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. 6 The Next Several Slides Detail Upcoming Construction Projects at Blue Plains and Throughout the District of Columbia for FY2012 through FY 2016

7. 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. 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. 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. 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. 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. 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. 13 BIOSOLIDS PRESENTED BY Phil Braswell

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

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

16. 16  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 Biosolids Management Program

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

18. 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. 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. 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