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:

2011

and

History

Onondaga Lake Facts

Watershed: 285 Square

Miles

1 Mile Wide – 4.6 Miles

Long

Average Depth: 35 feet

Max Depth: 63 feet

1940 – Swimming Banned

1970 – Fishing Banned

• 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 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

Save the Rain Program: 2009-2018

Regulatory Goals • Capture and Treat 95% of

the Annual CSO Volume via Gray & Green Infrastructure

• Achieve water quality standards in tributaries and lake

Community

Impacts/Goals• Improve quality of life

• Promote Sustainability

• Ensure cost effectiveness in compliance with ACJ milestones

Major Milestones

• 89.5% capture/elimination by 12/31/2013

• 95% capture/elimination by 12/31/2018

Gray Infrastructure Program Summary

Gray Projects

• Harbor Brook Interceptor (ARRA)

• Midland Conveyance (CSO 044)

• Clinton Storage Facility and Electrical Ductbank

• Harbor Brook Storage Facility and Conveyances

• Erie Boulevard Storage System (EBSS) Gate Chamber #3 Improvement

• Sewer separation projects

• Floatables Control Facilities

Gray Project Construction ScheduleCSO 022/045 Sewer Separation Consent Order Milestones: Complete Construction: 12/31/12Construction Period: September 2011 – June 2012 Clinton Storage FacilityConsent Order Milestones: Commence Construction: 10/1/11

Complete Construction: 12/31/13Construction Period: August 2011 – December 2013 Lower Harbor Brook Conveyances: Consent Order Milestones: Commence Construction: 12/31/11

Complete Construction: 12/31/13Construction Period: September 2011 – June 2012 Lower Harbor Brook Storage: Consent Order Milestones: Commence Construction: 12/31/11

Complete Construction: 12/31/13Construction Period: October 2011 – December 2013 Electrical Duct Bank on West Fayette Street ( Part of Clinton Storage Project)Consent Order Milestones: N/A Construction Schedule: July 2011 – October 2011

Harbor Brook Storage Project

N

Captures CSO 003, 004, 063

Designed to capture rain water for system flushing/cleaning

4.8 Million Gallons of storage (sub-surface)

Sta

te F

air

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Green Infrastructure ProgramSave the Rain Program

6.3% Capture Using Green Infrastructure - Green 470 acres and reduce 247 MG/yr of CSO by 2018

Dept. of Transportation Parking Lot

Manages adjacent impervious areas

City Lot #3 - Before

Warren Street

Parking Lot #3

James Stre

et

Erie BoulevardW

arren Street

James Stre

et

Erie Boulevard

Porous ConcreteCaptures over 700,000 gallons of stormwater annually

Roadways - Green Streets for Road and Utility Improvement / Reconstruction

Constructed Wetland

HarborBrook

CSO 018

CSO Treatment Wetland Project

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

May2011

16

Existing Site

May 2011

17

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.

May 2011

18

Site Enhancement Ultimate Vision

▫ Grit and floatables removal of CSO 018

▫ Wetland treatment of CSO 018

▫ Improved water quality in Harbor Brook

▫ Community park?▫ Educational

resource?

May 2011

19

Pilot Treatment Wetlands System

March 2011

20

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

First Step to Site Enhancement

May 2011

21

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

May 2011

22

Three types of wetlands will be constructed for pilot testing: Floating Wetland Island, Vertical Downflow, and Surface Flow.

11/18/2010

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Conceptual Rendering

Floating Wetland Islands

May 2011

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Vertical Downflow Wetlands

March 2011

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Surface Flow Wetland

May 2011

26

Questions and Discussion

May 2011

27

11/18/2010

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More information

Thank You!

Please Visit us atwww.SaveTheRain.us