BLUE PLAINS TUNNEL DC CLEAN RIVERS PROJECT Tunnel Achievement - - PowerPoint PPT Presentation

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BLUE PLAINS TUNNEL DC CLEAN RIVERS PROJECT Tunnel Achievement - - PowerPoint PPT Presentation

Apr 01, 2023 369 likes •641 views

District of Columbia Water and Sewer Authority George S. Hawkins, CEO and General Manager BLUE PLAINS TUNNEL DC CLEAN RIVERS PROJECT Tunnel Achievement Awards Banquet 10th Annual Breakthroughs in Tunneling Short Course August 15, 2017

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SLIDE 1

District of Columbia Water and Sewer Authority

George S. Hawkins, CEO and General Manager

August 15, 2017 Carlton M. Ray

Director, DC Clean Rivers Project, DC Water

Tunnel Achievement Awards Banquet 10th Annual Breakthroughs in Tunneling Short Course

BLUE PLAINS TUNNEL DC CLEAN RIVERS PROJECT

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SLIDE 2
  • DC Water
  • DC Clean Rivers Background
  • Anacostia River Tunnel System
  • Blue Plains Tunnel
  • Procurement
  • Lessons Learned
  • Questions

Agenda

1

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SLIDE 3

Who We Are

DC Water (District of Columbia Water and Sewer Authority)

  • Provides
  • Drinking water distribution for DC
  • 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,

Maryland

  • Fairfax & Loudoun Counties, Virginia
  • 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 approximately

725 Square Miles

Blue Plains Advanced Wastewater Treatment Plant

2

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SLIDE 4

Dulles International Airport

Who We Serve

Blue Plains Service Area

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  • Provides
  • Drinking water distribution for DC
  • 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, Maryland

  • Fairfax & Loudoun Counties, Virginia
  • 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

approximately 725 Square Miles

Blue Plains Advanced Wastewater Treatment Plant

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SLIDE 5

DC Clean Rivers Background

Magnitude of the Challenge

Chronic Sewer Flooding Combined Sewer Overflows

CSO Discharge to Anacostia River Trash in Anacostia River 4

Current chance of flood occurring in any given year Chance of flood after Northeast Boundary Tunnel

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SLIDE 6

Clean Rivers Background

Plan

  • DC Clean Rivers Project: $2.7 Billion
  • Nitrogen Removal: $950 Million
  • Total > $ 3.5 Billion
  • 25 yr implementation (2005 – 2030)
  • 96% reduction in CSOs & flood relief in Northeast

Boundary

  • Approx 1 million lbs/yr nitrogen reduction predicted

DC CLEAN RIVERS PROJECT AND NITROGEN REMOVAL PROGRAMS 5

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SLIDE 7

Clean Rivers Background

21st Century Sewer System

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SLIDE 8

Clean Rivers Background

Benefits

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CSO Reduction to Anacostia River

2,142 1,063 49 3,254 1,282 638 48 1,968 54 79 5 138 500 1,000 1,500 2,000 2,500 3,000 3,500 Anacostia River Potomac River Rock Creek Total System CSO Overflow (mg/avg year) 1996 2016 Clean Rivers Completed

96% Reduction Overall, 98% on Anacostia River

Flood Mitigation in Northeast Boundary

14.1 8.7 6.0 6.2 7.3 6.3 5.2 5.3 5.4 6.7 5.3 4.8 3.7 3.2 3.1 3.8 2.6 2.6

Chesapeake Bay Agreement Goal 8.5 million pounds/year New NPDES Permit Limit 4.4 million pounds per year

Effluent TN Discharged in million pounds/year

Nitrogen Removal for Chesapeake Bay

1st & V St NW Rhode Island Metro

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SLIDE 9

ANACOSTIA RIVER TUNNEL SYSTEM

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Project Diameter Length Start Finish Blue Plains Tunnel ($319M) 23 24,207 5/2011 8/2015 Anacostia River Tunnel ($254M) 23 12,484 6/2013 12/2017 Northeast Boundary Tunnel ($580M) 23 27,000 9/2017 5/2023 First Street Tunnel ($158M) 20 2,700 10/2013 10/2016 Various other contracts to connect to tunnel system

Blue Plains Tunnel Poplar Point PS Anacostia River Tun. Main PS Diversions Tingey St Div. Sewer CSO 007 CSO 019 Northeast Boundary Tunnel M St Div. Sewer First St Tunnel JBAB Diversions

J

Legend

Completed Construction Procurement

LID at DC Water Facilities

A Blue Plains Tunnel B Tingey Street Diversion Sewer C CSO 019 Overflow and Diversion Structures D JBAB Overflow and Potomac Outfall Sewer Diversion E M Street Diversion Sewer (CSOs 015, 016 and 017) G CSO 007 Diversion Structure and Diversion Sewer H Anacostia River Tunnel I Main Pumping Station Diversions N LID at DC Water Facilities P First Street Tunnel J Northeast Boundary Tunnel S Irving Street Green Infrastructure Y Blue Plains Dewatering Pumping Station and ECF Z Poplar Point Pumping Station Replacement

Anacostia River Tunnel System

Snapshot

More than $1.8 B in Contracts have been let for the Anacostia River Projects

9

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SLIDE 11

Anacostia River Tunnel System

Tunnel Profile

  • Pumping station and wet weather treatment facility at Blue Plains
  • Minimum Grade = 0.1%
  • Depth determined by going under the following facilities:
  • Bridges
  • Structures
  • Utilities
  • Working depth limited to 3 bars of water

10

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SLIDE 12

BLUE PLAINS TUNNEL

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SLIDE 13

Blue Plains Tunnel

23 feet in diameter 24,207 feet long 05/2011 to 08/2015 Traylor-Skanska-JayDee

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  • Key component of Clean Rivers Project
  • Key component of TN/Wet Weather Plan
  • First major tunnel in program
  • Significant suburban cost contribution

What is it?

  • 23’ inside dia, 24,207 feet long
  • 5 shafts – 50’ to 132’ Inside diameter
  • 75 million gallons storage

Capacities

  • Traylor-Skanska-JayDee (Designer CH2M)
  • $330 million contract amount, $319 M final

amount

  • Award: May 2011
  • Substantial completion: Dec 2015

Design-Builder

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SLIDE 14

Blue Plains Tunnel

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  • Best day: 150 feet
  • Best Week: 631 feet
  • Average: 57 ft/day (excludes zero days)
  • 726 calendar days
  • Bolted and gasketed concrete steel fiber reinforced

segments

  • EPBM - Herrenknect

Tunnel Boring Machine

  • Design MBE/WBE = 46%/5% (goal= 28%/4%)
  • Construction MBE/WBE = 38%/3% (goal= 32%/6%)
  • Total payments to MBE/WBE more than $110 M

MBE/WBE

  • 591 cumulative employees on project
  • 239 from DC and user jurisdictions
  • 40 new hires sourced from Dept. of Employment

Services (DOES) Local Resident Hiring

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SLIDE 15

Lady Bird Advances

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  • First design-build project for DC Water
  • 100 yr design life 100 yr Green

Century bond

  • Proprietary collaboration procurement

process

  • Protected 100 year old sewers from

shaft excavation with unintrusive soil mix columns

  • Slurry wall containment wall replaces

jet grouting for watertight TBM launch

  • Circular deaeration at intermediate

shafts eliminated separate drop shafts and deaeration tunnels

  • Binocular shaft at Blue Plains

eliminated connecting tunnel between shafts

Blue Plains Tunnel

Innovations

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SURGE RISER (EQUAL TO ID OF TUNNEL) DEAERATION CHANNEL 23-FT DIA. TUNNEL PLUNGE POOL BAFFLE WALL DRAIN ORIFICE PARTITION WALL DROP PIPE 50-65-FT SHAFT

“Binocular” Shaft Circular Deaeration Shaft Slurry Wall Replaces Jet Grout for TBM Launch

Slurry walls TBM launch area

Soil Mix Columns Protect 100-yr Old Active Sewers

Soil mix columns improve ground Shaft 100 yr old sewers (typ)

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SLIDE 17
  • Completed more than 1.6 million person-hours without a lost time accident
  • Maintained a recordable incident rate (RIR) well below the Bureau of Labor

Statistics (BLS) national average for heavy civil construction:

  • TSJD: 1.82
  • BLS national average: 3.0

Blue Plains Tunnel

Safety

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SLIDE 18

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SLIDE 19

PROCUREMENT

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Historical Delivery Methods

  • DC Water has typically used traditional

Design-Bid-Build (DBB) delivery process

  • For LTCP projects, DC Water considered

alternative project delivery methods, recognizing:

  • Tunneling projects differ from typical DC

Water CIP

  • Early contractor involvement can reduce

risks

  • Consent Decree schedule was a big driver

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Project Delivery

Rationale for Design-Build

  • Benefits from early contractor involvement:
  • Opportunity to reduce uncertainties between parties (mutual risk reduction)
  • Contractor design decisions
  • Facilitates discussing issues in a confidential setting pre-bid
  • Enhances alternative technical approaches
  • Schedule compression and flexibility
  • Need for price certainty
  • Price competition

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  • Sensitive to marketplace’s concerns on risk

allocation and procurement confidentiality

  • Consent Decree

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SLIDE 22

Design-Build Procurement Process

Industry Outreach

Generate Project Interest, Update on Project Progress M/WBE Networking

RFQ

Request Qualifications Statements

Shortlist

Evaluate SOQ and Shortlist up to 4 Teams Confidential Meetings Teams Provide Technical Approach to Build Project Select Based

  • n Best Value

Review Technical Approach

Collaboration Technical and Cost Proposals Evaluation

Review and Score Technical Proposals

Interviews

Conduct Interviews with Shortlisted Teams

Selection

Review Final Scoring Open Price Proposals

Clarifications and Debrief

Contract Clarifications Incorporate Components of Technical Proposals Hold Debrief Meetings with Unsuccessful Teams Provide Stipend to Unsuccessful Teams

Best Value

  • Technical Proposal Evaluation Factors (35% of score)
  • Project Management and Organization
  • Design and Construction Plan
  • M/WBE Business Development Plan, Local Hiring Initiative

and Subcontracting Plan

  • Price Proposal (65% of score)
  • Selection on price and technical proposal = best value

21 1 to 2 weeks 1 month 2 months 1 month before RFQ 8 to 9 months 1 month before RFP Issued 6 month process TIMEFRAME

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SLIDE 23

LESSONS LEARNED

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  • Become owner of choice
  • Be fair, listen to contractors concerns, pay on

time, fairly adjudicate claims

  • Design-builder participation during collaboration

extremely valuable

  • Select key topics for collaboration and conduct

substantive discussions on construction approaches

  • e.g. TBM selection, shaft construction techniques,

dewatering, maintenance of traffic

  • Clarifications phase is valuable in reaching a final

contract

  • Challenges bring up opportunities to make

broader changes that benefit the entire program

  • Remain focused on your overall vision and goals

– keep these in mind when approaching problems

Lessons Learned

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Blue Plains Tunnel was an excellent project, built on time, under budget, safely and with high quality

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SLIDE 25

A Drop’s Life

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SLIDE 26

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Questions

Carlton M. Ray

email: CARLTON.RAY@DCWATER.COM phone: 202-787-4469 25