Download - Greening the Gray - NYWEA 2012
Onondaga County CSO Abatement – Greening the Gray
Onondaga County CSO Abatement – Greening the GrayJoanne M. Mahoney, County Executive
Onondaga Lake Amended Consent Judgment (ACJ) Compliance Program
New York Water Environment Association84th Annual MeetingTom Rhoads, Commissioner, Onondaga County
Robert Kukenberger, CDM/C&SKristen Angello, Malcolm Pirnie the Water Division of Arcadis,
Bruce Munn, GHDRob Ganley, O’Brien & Gere
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2Onondaga County,New York City of Syracuse
Onondaga Lake
• 7,660 acres• 49 CSOs• ~1 Billion gallons/year CSO
Onondaga Creek
Harbor Brook
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3HistoryHistoryOnondaga Lake Facts
Watershed: 285 Square Miles1 Mile Wide – 4.6 Miles Long
• 1988 – Atlantic States Legal Foundation files lawsuit against County
• 1989 – Litigation settled through METRO consent judgment
• 1998 – METRO consent judgment replaced with Amended Consent Judgment (ACJ)
• 1st ACJ amendment May 1998Average Depth: 35 feetMax Depth: 63 feet
1940 – Swimming Banned1970 – Fishing Banned
• 1st ACJ amendment May 1998• 2006 ACJ Amended to include
consolidation of ammonia and phosphorus treatment and Harbor Brook conveyances and RTF
• 3rd Amendment April 2008 (Extension) • 2009 ACJ amended to authorize use of
Gray and Green infrastructure
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44th ACJ Amendment Authorized aBalanced Approach to CSO Abatement
Regulatory Goals • Capture and Treat 95% of the Annual CSO Volume via Gray & Green Infrastructure
• Achieve water quality
Community Impacts/Goals• Improve quality of life through environmental responsibility
• Promote sustainability• Ensure cost effectiveness in • Achieve water quality
standards in tributaries and lake
• Ensure cost effectiveness in compliance with ACJ milestones
• Community revitalization
Major Milestones • 89.5% capture/elimination by 12/31/2013 • 95% capture/elimination by 12/31/2018
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5Gray Program Manager Needed to Support Green/Gray Program• County Required a Willing Partner to Implement Gray while supporting Green
• Green and Gray Program Managers needed to • Green and Gray Program Managers needed to collaborate for Balance Green/Gray Program
• Gray Program Manager provides Planning and Design coordination and Construction Management for Gray Projects totaling $150 million in construction value
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Presentation Agenda
• Learning Objectives• Introduction of Five Gray CSO Projects featuring Green Infrastructure ComponentsGreen Infrastructure Components
• Challenges and Rewards of incorporating Green Infrastructure
• Lower Harbor Brook Storage Fly Over
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Learning Objectives• Its easy being Green -Every Gray Project can be
Green• Community becomes the Chearleader of Gray projects with Green Components – Investment projects with Green Components – Investment in Public Infrastructure requires Public Support
• Need a balanced Green/Gray Program• The large gray projects would not be feasible as designed without green
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Greening the Gray Process Flow Chart
Preliminary Design
GI Concepts� Green Roofs� Rain Gardens� Bio Swales
� Storm water reuse� Porous Pavement
Support for Green?
Community Workshops
Yes
No
100% Green/Gray Design
� Porous Pavement�Urban Forestry� Educational Features
Reviews 95% Design
Conceptual Design
No100% Gray Design
Continue Gray Design
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9Project 1. Harbor Brook Interceptor Sewer Replacement Project• Gray Project Components▫ ARRA funding
� $12 million grants, � $12 million low interest � $12 million low interest loans
▫ 7500’ of 18” to 36” diameter interceptor
▫ 3500’ of 36” diameter water main
▫ 2 areas of sewer separation
Construction on Fowler HS Grounds
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10Harbor Brook Interceptor Replacement Green Components
Rain garden on RTF Site75 Infiltrating Tree Basins
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Project 2. Midland Avenue Conveyance• Green and Gray
▫ Connects major CSO to existing RTF▫ 96” diameter HDPE Pipeline▫ Flushing and regulator chamberschambers▫ $8 million construction▫ 5,000 gallon Stormwater Reuse for flushing▫ Community selected Educational Green Infrastructure Trail – To be Presented in Session 15 Public Outreach Tuesday at 1:30pm Construction in Urban Neighborhood
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Midland Green Educational Trail
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Midland Green Educational Trail
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Project 3. Sewer Separation• Two urban areas
▫ one residential▫ one commercial
• 2000’ sanitary sewer installationinstallation
• 700’ storm sewer installation
• 2000’ internal pipe lining• $6 million construction • 20 infiltration trees• Rain Garden in rehabilitated “pocket” park
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Sewer Separation Pocket Park Rain Garden
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16Project 4: Clinton CSO Storage Project• Located on site of previously planned RTF in Armory Square
• 6 million gallon underground storage facilityfacility
• $70 million construction cost
• 77,000 gallon stormwater storage for flushing• Two biorention basins• Green roof on Operations
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Clinton CSO Storage Completed Site
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Clinton CSO Storage
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19Clinton CSO Storage Reinforced Slurry Wall Construction
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20Project 5: Lower Harbor Brook CSO Storage Facility• Located on site of previous planned RTF
• 5 million gallon circular below grade tank with center flushing systemcenter flushing system
• $30 million construction• 80,000 gallon stormwater storage for flushing
• Biorention basin for stormwater capture
Challenges and Rewards• Challenges▫Educating the Team▫Green/Gray Design Coordination
• Rewards▫Community Support and Ownership▫ Improves Quality of ▫Regulatory Reviews
and Approvals▫Construction Quality▫Warranty and Maintenance
▫ Improves Quality of Life▫Design and Construction Team takes Pride▫Lower Life Cycle Cost▫Dedicated Funding
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Up Next - Flyover
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Questions
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