clinton combined sewer overflow (cso) storage facility...
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Onondaga County Executive Joanne M. Mahoney
Clinton Combined Sewer Overflow (CSO) Storage Facility Project
Onondaga County Executive Joanne M. Mahoney
Bruce G. Munn, Nicholas Capozza, Ryan C. Fisher, A.J. McGinnJune 4, 2013
Onondaga County Executive Joanne M. Mahoney
Project Team Acknowledgement • Environmental Engineering Associates, LLP
• GHD• O’Brien & Gere• ARCADIS
Onondaga County Department of Water Environment Protection
• Matthew J. Millea, Deputy County Executive• Tom Rhoads PE, Commissioner• Nicholas Capozza, Project Manager
Onondaga County Executive Joanne M. Mahoney
Project Team Acknowledgement Brierley Associates – Geotechnical Engineering
Bryant Associates – Structural Inspection ServicesFisher Associates – Site/Civil Inspection ServicesB&L Engineering – Site/Traffic DesignGroup One Design – Architectural DesignLandscape & Prospect – Landscape Architecture PB Americas – Noise Mitigation
CDM/C+S Joint Venture – Construction ManagementJett Industries/Kiewit Construction – General Contractor
Onondaga County Executive Joanne M. Mahoney
Project Background
• Judgment on Consent signed in 1989• Amended Consent Judgment (ACJ) signed 1998
Capture >85% of average annual CSOsRemoval of floatables Achieve water quality standards for bacteria in Onondaga Lake
• County negotiated 4th Stipulation ACJ November 2009
3.7 MG Clinton CSO storage operational by December 31, 2013
Incorporation of Green Infrastructure for CSO reduction
95% CSO Capture by December 31, 2018
Onondaga County Executive Joanne M. Mahoney
Project LocationOnondaga Lake
Metro WWTP
Destiny USA
Clinton CSOStorage Facility
Armory Square
S.U. Sheraton
Onondaga County Executive Joanne M. Mahoney
Key Project Goals/Challenges
• Meet ACJ milestones and requirements– Complete Design November 2010– Commence Construction July 2011– Commence Operation December 31, 2013
• Keep all CSO storage below grade– Allow reuse of parking lot above CSO Storage– High saline content of groundwater up to 80,000 mg/l– Comply with BMP’s for groundwater dewatering
Onondaga County Executive Joanne M. Mahoney
Key Project Goals/Challenges
• Other County Goals– Maximize CSO Storage– Requirement to accommodate 1 year
2 hour storm flow – Be consistent with “Save the Rain Program”
• Local Construction Concerns– Mitigation of construction noise– Parking/Traffic mitigation– Archeological/Environmental concerns
Onondaga County Executive Joanne M. Mahoney
CSO Storage Facility Alternatives
1. Conventional Dewatering/Construction2. Tunneling Construction 3. Four Vertical Slurry Wall Tanks/Cut and Cover
Conveyance 4. Three Vertical Slurry Wall Tanks/Single Tunnel
Onondaga County Executive Joanne M. Mahoney
Alternative Cost Analysis1
Cut-and-Cover (single tank)
2
Three Tunnels
3
Slurry Wall Three Tank/Tunnel
4
Slurry Wall four tank and cut-and-
cover
Construction Cost $55,800,000 $36,700,000 $41,200,000 $48,800,000
Overflow Pumping Addition $3,300,000 $3,300,000 $3,300,000 $3,300,000
Contingency (20%) $11,800,000 $8,000,000 $8,900,000 $10,400,000
Subtotal Construction Cost $70,900,000 $48,000,000 $53,400,000 $62,500,000
Escalation to Construction Mid
Point in 2012 (6%)$4,300,000 $2,900,000 $3,200,000 $3,800,000
Total Estimated Construction Cost $75,200,000 $50,900,000 $56,600,000 $66,300,000
Onondaga County Executive Joanne M. Mahoney
Unique Design Aspects• Innovative Geotechnical
ApproachSlurry diaphragm wall constructionJet grout plug and sheeting groundwater containmentOpen face + closed face TBM options
• Specialized Construction Prequalification
Jet grouting Tunneling
• Project Labor Agreement Provisions
Union work forceExemption from Wicks LawOne construction contract
Onondaga County Executive Joanne M. Mahoney
Use of Green Technologies
• Recovery and reuse of storm drainage flows for CSOStorage Cleaning
• Bioswales and storm flow treatment• Green roof on West Chamber• Use of LED site lighting and parking lot lighting• “Flow through by gravity” design
Onondaga County Executive Joanne M. Mahoney
Construction Approach
• Project Bid July 2011 - $70,640,000– General Contractor - Jeff Industries/
Kiewit Construction • Contract Awarded August 2011• Revised Construction Approach
Reinforced concrete box tunnels vs. circular tunnels
Onondaga County Executive Joanne M. Mahoney
Project Status
• Project is 70% complete• Scheduled for operational December 31, 2013• 12 month start up and performance period,
December 31, 2014• Project updates to follow
Onondaga County Executive Joanne M. Mahoney
QUESTIONS?
Onondaga County Executive Joanne M. Mahoney
Bruce Munnbruce.munn@ghd.com
(315) 679 5800
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