district of columbia water and sewer authority george s. hawkins, general manager
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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 - PowerPoint PPT PresentationTRANSCRIPT
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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
Phillip Braswell, Brown and CaldwellDonal Barron, Greeley and Hansen
Bo Bodniewicz, AECOM
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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
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Blue Plains Service Area
Blue Plains Wastewater Treatment Plant
Dulles International
Airport
Sewer
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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
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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.
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The Next Several Slides Detail Upcoming Construction Projects at Blue Plains and Throughout
the District of Columbiafor FY2012 through FY 2016
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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
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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
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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
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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
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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
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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
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BIOSOLIDS PRESENTED BY Phil Braswell
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Blue Plains Advanced Wastewater Treatment Plant
(August 2010)
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Blue Plains Advanced Wastewater Treatment Plant (July 2012)
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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
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Pre-Dewatering
FinalDewatering
RecycleProcessing
R
R R
GravityThickeners
R
R
Class ALoadout
Biogas Treatment and CHP
Lime
ThermalHydrolysis
Steam Biogas
Emissions
Store &Loadout
Class B
DAFTs
MixDewatering
MesophilicAnaerobicDigestion
DBO ($83M)
DB ($208M) DBB ($78M)
Site Preparation
Electricity
DBB ($6.0M)
Program Components & Delivery Methods
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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
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Reasons for Considering Alternative Delivery – 2010 Program
• Schedule • Improved coordination• Potential innovation
Digester constructionConstruction sequencing Interface coordination
• CHP not part of DC Water expertise• How is it working out? 2012
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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