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Onondaga County CSO Program:Gray-Green Infrastructure
Harbor Brook CSO 018 Constructed Wetlands Pilot Treatment SystemJoanne M. Mahoney, County Executive
Prepared for:
Onondaga County, Syracuse, New YorkPrepared by:
March 2011
and
Project LocationThe project is located along Harbor Brook on County property just south of Burnet Park on the west side of Syracuse near the Skunk City neighborhood.
March 2011
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Existing Site
11/18/2010
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Site Enhancement Ultimate Vision
▫ Wetland treatment of CSO 018
▫ Grit and floatables removal of CSO 018
▫ Improved water quality in Harbor Brook
▫ Community park▫ Educational
resource
March 2011
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First Step to Site Enhancement
March 2011
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Design and construction of a 2 acre full scale pilot treatment wetland system along Harbor Brook at Combined Sewer Overflow (CSO) 018. VELASKO ROAD
Conceptual Rendering
March 2011
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Three types of wetlands will be constructed for pilot testing: Floating Wetland Island, Vertical Downflow, and Surface Flow.
Pilot Treatment Wetlands System
March 2011
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Floating Wetland Island▫ Vegetation mats
planted with diversity of native species
▫ Mats float on water surface with roots in water column
▫ Provides high storage volume without inundating plants
▫ High habitat value▫ Low mosquito
productivity
Floating Wetland Islands
March 2011
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Pilot Treatment Wetlands System
March 2011
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Vertical Downflow Wetland
▫ Flow is dosed and distributed across surface to percolate through gravel bed
▫ Planted with robust native species to tolerate flooding and draining
▫ No open water and no mosquito productivity
Vertical Downflow Wetlands
March 2011
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Pilot Treatment Wetlands System
March 2011
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Surface Flow Wetland▫ Most closely
resembles a natural wetland of robust native species
▫ Vegetated shelf and deep water zones to redistribute and aerate
▫ Medium to high storage volume
▫ High habitat value▫ Low mosquito
productivity▫ Relatively low cost
Surface Flow Wetland
March 2011
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CSO 018 Treatment Overview
11/18/2010
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Pilot Operations - Series Flow
March 2011
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Pilot Operations - Parallel Flow
March 2011
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Pilot Operations – Series & Parallel
March 2011
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Pilot Treatment System Benefits•Pilot system will provide immediate water
quality improvements:▫Grit and floatables (onsite at-grade
structure)▫Bacteria▫Nutrients (nitrogen and phosphorus)▫Total suspended solids and BOD5
•Recommendation from pilot will result in a final permanent wetland treatment system
•Designed for 1-year, 2-hour storm event, but higher flows and volumes could be accepted
March 2011
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Permits and Approvals Required• SPDES Permit Modification for CSO 018 – NYSDEC• Article 15 Permit Modification Protection of Waters –
NYSDEC• Section 401 Water Quality Certification – NYSDEC• SPDES General Construction Permit – NYSDEC• Nationwide Permit No.7 Outfall Structures – USACE• Nationwide Permit No.43 Stormwater Mgmt. Facilities –
USACE• Coordination with NYS Natural Heritage, U.S. Fish &
Wildlife Service, and NYS Office of Parks, Recreation and Historic Preservation
• OCDWEP – fill and compensatory storage • City of Syracuse Site Preparation Permit (10,000 SF
threshold)• City of Syracuse Curb-cut Permit (access to grit &
floatables facility)
March 2011
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Stakeholder Outreach• City of Syracuse
▫ Dept of Engineering▫ Bureau of Planning and
Sustainability▫ Dept of Public Works▫ Dept of Parks and
Recreation▫ Div of Code Enforcement
• New York State Agencies▫ Dept of Environmental
Conservation▫ Dept of Transportation
• Federal Agencies▫ U.S. Army Corps of
Engineers▫ Federal Emergency
Management Agency▫ USGS (gauging station)
• Organizations and Not-for-profit Groups▫ Atlantic States Legal
Foundation, Inc.▫ Onondaga Environmental
Institute▫ Onondaga Nation▫ Westside TNT
Neighborhood
March 2011
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Stakeholder Outreach• Organizations and Not-for-
profit Groups, continued▫ Syracuse United
Neighbors Westside Coalition
▫ Partnership for Onondaga Creek
▫ Syracuse Parks Conservancy
▫ Syracuse Chargers Rugby Club
▫ Catholic Charities
• Other Municipalities▫ Town of Geddes
Supervisor
• Schedule▫ March 18 City/County
Meeting presentation▫ April 7 meeting with
Mayor and County Executive
▫ Correspondence and consultation as needed
▫ Presentation to community group leaders in mid-April
March 2011
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Project Schedule
•Design and stakeholder outreach is underway
•Permit submittals and regulatory approvals are critical for schedule
•Construction is targeted for 2011•2 year monitoring period•Planning and design for final wetland
treatment system and site enhancement can begin during monitoring period
March 2011
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Questions and Discussion
March 2011
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