Onondaga County CSO Program:Gray-Green InfrastructureHarbor Brook CSO 018 ConstructedWetlands Pilot Treatment SystemJoanne M. Mahoney, County Executive Prepared for: Onondaga County, Syracuse, New York Prepared by: and March 2011
2 March 2011Project Location The 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.
4 March 2011Site 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
5 March 2011First Step to Site EnhancementDesign andconstruction of a 2acre full scale pilottreatment wetlandsystem along HarborBrook at CombinedSewer Overflow(CSO) 018.
6 March 2011Conceptual Rendering Three types of wetlands will be constructed for pilot testing: Floating Wetland Island, Vertical Downflow, and Surface Flow.
7 March 2011Pilot Treatment Wetlands System 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
9 March 2011Pilot Treatment Wetlands System 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
11 March 2011Pilot Treatment Wetlands System 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
16 March 2011Pilot Operations – Series & Parallel
17 March 2011Pilot 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
18 March 2011Permits 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)
19 March 2011Stakeholder Outreach• City of Syracuse • Federal Agencies ▫ Dept of Engineering ▫ U.S. Army Corps of Engineers ▫ Bureau of Planning and ▫ Federal Emergency Sustainability Management Agency ▫ Dept of Public Works ▫ USGS (gauging station) ▫ Dept of Parks and Recreation ▫ Div of Code Enforcement • Organizations and Not-for- profit Groups• New York State Agencies ▫ Atlantic States Legal ▫ Dept of Environmental Foundation, Inc. Conservation ▫ Onondaga Environmental ▫ Dept of Transportation Institute ▫ Onondaga Nation ▫ Westside TNT Neighborhood
20 March 2011Stakeholder Outreach• Organizations and Not-for- • Schedule profit Groups, continued ▫ March 18 City/County ▫ Syracuse United Neighbors Meeting presentation Westside Coalition ▫ April 7 meeting with Mayor ▫ Partnership for Onondaga and County Executive Creek ▫ Correspondence and ▫ Syracuse Parks Conservancy consultation as needed ▫ Syracuse Chargers Rugby ▫ Presentation to community Club group leaders in mid-April ▫ Catholic Charities• Other Municipalities ▫ Town of Geddes Supervisor
21 March 2011Project 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