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

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


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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


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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


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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


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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

District of Columbia Water and Sewer Authority George S. Hawkins, General Manager

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