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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