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 1 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 Blue Plains Advanced Wastewater Treatment Plant 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 2 Blue Plains Service Area Dulles International Airport Sewer Blue Plains Wastewater Treatment Plant 3 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 overflow, 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 4 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 Our Capital Improvement Sanitary Sewer – $269M Program (CIP) for the next CSO/LTCP – $324M 10 years is valued at Stormwater – $11M $4 billion, and over the next 20 years, $8.2 billion. Water – $235M • 5 The Next Several Slides Detail Upcoming Construction Projects at Blue Plains and Throughout the District of Columbia for FY2012 through FY 2016 6 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 7 Sanitary Sewer Service System includes 600 miles of large interceptor sewers and smaller gravity collection sewers Continue to assess condition of sanitary sewer system Estimated Construction Value FY2012 – FY2016 $150 – $270 million Projects include: • Rehabilitation and replacement of sewers • Minimize infiltration / inflow 8 Combined Sewer Overflow Service Reduce overflow by a projected 96 to 98 percent • Improve water quality • Reduce debris in our local waterways Estimated Construction Value FY2012 – FY2016 $536 – $618 million Upgrade pumping stations to increase their pumping capacity Develop and construct projects to control wet weather related pollution 9 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 10 Water Service Design and construction projects that maintain water quality, improve water pressure, and provide reliable fire protection System includes approximately • • • Estimated Construction Value FY2012 – FY2016 $140 – $240 million 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 11 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 12 BIOSOLIDS PRESENTED BY Phil Braswell 13 Blue Plains Advanced Wastewater Treatment Plant (August 2010) 14 14 Blue Plains Advanced Wastewater Treatment Plant (July 2012) 15 15 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 16 Program Components & Delivery Methods Emissions Gravity Thickeners Electricity DB ($208M) R PreDewatering DAFTs DBB ($6.0M) DBO ($83M) Biogas Treatment and CHP Steam Thermal Hydrolysis Mesophilic Anaerobic Digestion R Final Dewatering Class A Loadout Recycle Processing R Lime Dewatering DBB ($78M) Biogas R R Site Preparation Mix Store & Loadout Class B 17 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 18 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 19 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 20