Coney Island Creek Combined Sewer Overflow Long Term Control Plan - PowerPoint PPT Presentation

Coney Island Creek Combined Sewer Overflow Long Term Control Plan Public Kickoff Meeting PS 90, Brooklyn, NY November 4, 2015

Welcome & Introductions Ibrahim Abdul-Matin Director of Community Affairs DEP 2

What is a Combined Sewer Overflow (CSO)?  NYC’s sewer system is approximately 60% combined, which means it is used to convey both sanitary and storm flows . Stormy Weather Conditions Dry Weather Conditions Down Down Spout Spout Catch Basin Catch Basin Building Sewer Building Sewer Combined Combined Connection Connection Sewer Outfall Sewer Outfall City Sewer Main City Sewer Main Sewer Sewer Regulator Regulator  When the sewer system is at full capacity, a diluted mixture of rain water and sewage may be released into local waterways. This is called a combined sewer overflow (CSO).  65% to 90% of combined sanitary & storm flow is captured at treatment plants. 3

What is a LTCP and CSO Consent Order? Long Term Control Plan (LTCP) identifies appropriate CSO controls to achieve applicable water quality standards consistent with the Federal CSO Policy and Clean Water Act CSO Consent Order an agreement between NYC and DEC that settles past legal disputes without prolonged litigation DEC requires DEP to develop LTCPs and mitigate CSOs 4

How does rainfall affect CSOs?  Rainfall characteristics that trigger a CSO event at Coney Island Creek:  0.4 to1-inch of constant rainfall over a period of 2 to 10 hours  Not every rainfall causes a CSO event:  Of the average 100 rainfall events per year about 22 CSO events may occur at Coney Island Creek Photo Credit: Baptisete Pons https://www.flickr.com/photos/bpt/2882285636/ 5

Rainfall Selection for Model Updates Evaluated a comprehensive range of rainfall data:  Historical data range: 42 years from 1969 to 2010  Four representative rainfall (LGA) gauges: Central Park, (ERW) LGA, JFK, and ERW  Selected 2008 JFK rainfall as the most representative of average annual rainfall across all four gauges 6

LTCP Process and Public Involvement Brooklyn Borough LTCP Due President’s Service Cabinet Meeting 6/30/16 9/9/2015 Existing Data Alternatives Information Collection & Modeling Development LTCP DEC Review Review Analysis & Evaluation Alternatives Final Plan Kickoff Meeting Review Meeting Meeting Spring 2016 TBD TODAY ONGOING PUBLIC/STAKEHOLDER INPUT 7

Questions? 8

Waterbody & Watershed Characteristics Jim Mueller, P.E. Assistant Commissioner DEP 9

Historical Photos of Coney Island Creek Photo Source: NYCEDC http://www.nycedc.com/photo-gallery/coney-island-creek-historic-photos 10

Land Uses of Coney Island Creek Drainage Area Residential & 70% Commercial Park and Open 10% Space Transportation & 7% Utility 6% Public Facility 1% Industrial 6% Other 11

Current Uses  Waterfront Public Access • Coney Island Creek Park 1 • Calvert Vaux Park 2 • Kaiser Park 2 3 1 4 • Home Depot public park and 4 5 walkway with seating 3  Boat Access • Private boat dock at Marlen 5 Gas Station (Neptune Ave & W 20 th Street) 5) Marlen Gas Station 1) Coney Island Park 2) Calvert Vaux Park Private Dock 12

Ongoing and New Developments 1) Coney Island Re-Zoning 1  Coney Island West: re-zone for residential uses with ground-floor retail  Coney Island North : re-zone for residential uses with ground-floor retails  Coney Island East: amusement and entertainment district (hotels, restaurants, retail, etc.) 3 2 2) Ocean Dreams Towers  Three residential towers with 500 1 condos 2  25,000 square feet of retail and 400 parking spaces 3 3) Coney Island Creek Resiliency Study  Conduct robust technical analysis of large-scale tidal barrier and wetlands  Identify measures to provide near-term flood protection  Recommend comprehensive flood protection plan 13 Sources: http://www.nycedc.com/project/coney-island-creek and http://www.nyc.gov/html/dcp/html/coney_island/index.shtm

Classification & Current Water Quality Standard WESTCHESTER CLASS I BRONX B o a t i n g / F i s h i n g QUEENS The best usages of Class I waters BROOKLYN are secondary contact recreation STATEN ISLAND and fishing. These waters shall be suitable for fish, shellfish and wildlife propagation and survival. Coney Island Creek Dissolved Fecal Total Oxygen Coliform Coliform (mg/L) (col/100 mL) (col/100 mL) ≥ 4.0 ≤ 2,000* ≤ 10,000 (Monthly GM) (Monthly GM) *Note: New rulemaking is proposed by DEC for primary contact criteria for Class I and Class SD of ≤ 200 col/100 ml for Fecal Coliform. 14

Coney Island Creek Drainage Area  Annual Wet-Weather Discharge Volume:  ~1,740 million gallons (MG) (typical year pre-WWFP) • 235 MG CSO (14%) • 1,505 MG Direct Drainage and Stormwater (86%)  Sewer System:  1 CSO Outfalls ( )  8 MS4 Outfalls ( ) Drainage Area 3,470 Acres Served by 24% Combined Sewers 15

Sampling Locations GOAL Assess attainment of Primary Contact Fecal Coliform criteria and understand the Entero attainment LTCP Sampling: • CSO Outfall Pipe • 1 location (Regulator upstream of Avenue V Pump Station) • Receiving Water Sampling • 7 location (C1 to C7) C7 (Sampled on day of video recording of CIC) C6 C1 C5 C3 C4 d C2 Other Sampling Programs: • Harbor Survey Floatables Monitoring Boom • 2 locations (CIC2, CIC3) • CSO Outfall • Sentinel Monitoring • Stormwater Outfall • 1 location (S21) 16

Fecal Coliform Results January 1, 2013 – August 25, 2015 CSO Outfall (OH-021) 100000 Wet Weather 14,236 Dry Weather 10000 Secondary Contact 10,249 Standard Fecal Coliform (#/100 ml) 2000 #/100 ml 1,010 Geometric Mean 1000 836 200 #/100 ml Potential Future 100 Primary Contact Standard 50 10 1 S21 CIC3 CIC2 (head-end) 15 Dry and 0 Wet 46 Dry and 30 Wet 44 Dry and 27 Wet Weather Samples Weather Samples Weather Samples 17

Fecal Coliform Results One Day Sampling Results (10/19/2015) # January 1, 2013 – August 25, 2015 CSO Outfall (Dry Weather) (OH-021) 100000 Wet Weather 14,236 Dry Weather 10000 Secondary Contact C2 10,249 C1 Standard Fecal Coliform (#/100 ml) 7,100 6,700 2000 #/100 ml 1,010 Geometric Mean C3 1000 1,200 836 200 #/100 ml Potential Future 100 Primary Contact Standard 50 C6 22 10 C4 C5 10 6 1 C7 1 S21 CIC3 CIC2 (head-end) 15 Dry and 0 Wet 46 Dry and 30 Wet 44 Dry and 27 Wet Weather Samples Weather Samples Weather Samples 18

Enterococci Results January 1, 2013 – August 25, 2015 CSO Outfall (OH-021) 1000 Wet Weather 480 Dry Weather Enterococci (#/100 ml) 100 123 Geometric Mean 46 30 #/100 ml Potential Future Primary Contact Standard 10 8 1 CIC3 CIC2 (head-end) 46 Dry and 30 Wet 44 Dry and 27 Wet Weather Samples Weather Samples 19

Enterococci Results One Day Sampling Results (10/19/2015) # January 1, 2013 – August 25, 2015 CSO Outfall (Dry Weather) (OH-021) 1000 Wet Weather 480 Dry Weather Enterococci (#/100 ml) 100 123 Geometric Mean 46 C2 C1 30 #/100 ml 51 45 C3 32 Potential Future Primary Contact Standard 10 8 C4 1.5 1 C7 C6 C5 <1 1 <1 CIC3 CIC2 (head-end) 46 Dry and 30 Wet 44 Dry and 27 Wet Weather Samples Weather Samples 20

Dissolved Oxygen Results January 1, 2013 – August 25, 2015 CSO Outfall (OH-021) 9.0 7.7 8.0 7.0 7.4 Dissolved Oxygen, mg/L 6.5 6.0 5.8 5.0 ≥ 4.0 mg/L 4.0 Current WQ Standard for Class I 3.0 2.0 Wet Weather 1.0 Dry Weather 0.0 CIC3 CIC2 (head-end) 27 Dry and 18 Wet 44 Dry and 27 Wet Weather Samples Weather Samples (top samples only) (top samples only ) 21

Questions? 22

Water Quality Improvement Projects Grey and Green Infrastructure Jim Mueller, P.E. Angela Licata Assistant Commissioner Deputy Commissioner DEP DEP 23

Grey Infrastructure: Coney Island WWTP  1890s : Coney Island WWTP placed into service as one of NYC’s first treatment plants to help protect the City’s beaches  1930s: Upgraded from chlorine disinfection to primary treatment.  1980s: Upgraded again to a secondary treatment plant to comply with the Clean Water Act (CWA)  Current plant capacity = 110 MGD (220 MGD in wet weather)  Population served ≈ 600,000  Drainage area served ≈ 15,000 acres  Design is currently in progress to upgrade the facility to remove Nitrogen 24

Grey Infrastructure: Avenue V Pumping Station Results in 20% Reduction in CSOs and Addresses 2016 ACEC New York Platinum Award Legacy CSO Odor Issues Facility is also eligible for Listing on the State Register for Historical Places Grey Infrastructure Floatables Boom 25

Grey Infrastructure: Avenue V Pumping Station Results in 20% Reduction in CSOs and Addresses Legacy CSO Odor Issues  Avenue V Pumping Station upgrade from Grey Infrastructure 30 MGD to 80 MGD  42 ” DW and 48” WW force mains to convey wet weather additional flows away from Coney Island Creek OH-021 Floatables  Floatables boom with Boom periodic skimming Upgraded Pump Station Operational: October 17, 2014 Total Construction Cost = $196 Million 26