Video Loop On July 20 th , 2016, DEP joined the Newtown Creek Alliance for a canoe tour of Newtown Creek 1
Newtown Creek Combined Sewer Overflow Long Term Control Plan Public Kickoff Meeting Location: Newtown Creek WWTP Date: November 15, 2016
Agenda Topic Speaker 1 Welcome & Introductions Mikelle Adgate 2 Waterbody & Watershed Characteristics Keith Mahoney and Water Quality Sampling 3 Water Quality Improvement Projects • Grey Infrastructure Keith Mahoney • Green Infrastructure Pinar Balci 4 LTCP Modeling & Alternative Keith Mahoney Development Process 5 Mikelle Adgate Next Steps 6 Discussion and Q&A Session All 3
Welcome & Introductions Mikelle Adgate Director of Stormwater Management Outreach DEP – BPA 4
Newtown Creek: Historical Context 1800’s The shoreline of Newtown Creek in the 1800’s – the system has since been drastically altered. Urban development throughout TODAY the decades has led to a highly impervious watershed in Newtown Creek. 5
Newtown Creek: Superfund September 29, 2010: Newtown Creek designated as Superfund Site July 2011: EPA administrative order to 6 potential responsible parties (PRPs): 1) Phelps Dodge Refining Corporation 2) Texaco, Inc. Newtown Creek 3) BP Products North America Inc. Group (NCG) 4) National Grid NY 5) ExxonMobil Oil Corporation 6) The City of New York Tonight’s meeting will focus on Newtown Creek LTCP and Clean Water Act Requirements 6
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 65% to 90% of combined sanitary & storm flow is captured at treatment plants. 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). 7
How does rainfall affect CSOs? Rainfall characteristics that trigger a CSO event at Newtown Creek: 0.05 to 0.27-inch of constant rainfall over a period of 2 to 10 hours Of the average 100 rainfall events per year about 63% may trigger a CSO at Newtown Creek Photo Credit: Baptisete Pons https://www.flickr.com/photos/bpt/2882285636/ 8
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 9
LTCP Process and Public Involvement LTCP Due 6/30/17 Existing Data Alternatives Information Collection & Modeling Development LTCP DEC Review Review Analysis & Evaluation Final Plan Alternatives Kickoff Review Meeting Meeting Meeting TBD TBD TODAY ONGOING PUBLIC / STAKEHOLDER INPUT 10
Questions? 11
Waterbody & Watershed Characteristics and Water Quality Sampling Keith Mahoney, P.E. Director of Water Quality Planning DEP – BEDC 12
Newtown Creek and Bowery Bay WWTPs Drainage Areas Drainage Areas: Citywide Drainage Area ≈ 300,000 acres Newtown Creek WWTP 15,033 acres Bowery Bay WWTP 14,928 acres Portion that Drains to Newtown Creek 7,442 acres 13
Newtown Creek Drainage Area 5 Urban CSO Tributaries • Dutch Kills • English Kills • Whale Creek • East Branch BB-026 • Maspeth Creek Sewer System NCB-631 • Newtown Creek (NC) WWTP • Bowery Bay (BB) WWTP NCQ-077 Newtown • 4 Major CSO Outfalls ( ) Creek • 2 Major DEP owned MS4 Outfalls ( ) NCB-083 NCB-629 NCB-015 Drainage Areas in Acres: Area that Area that drains Total drains to to Newtown Drainage Newtown Creek served by Area Creek combined sewers 15,033 5,577 4,636 NC WWTP 14,928 1,865 314 BB WWTP Newtown Creek Watershed served by Newtown Creek WWTP (5,577 acres) ~300,000 7,442 4,950 Citywide Newtown Creek Watershed served by Bowery Bay WWTP (1,865 acres) Combined Sewer (4,950 acres) 14
Water Quality Standards & LTCP Goals CLASS SD F i s h S u r v i v a l The best usage of Class SD water is fishing . These waters shall be suitable for fish, shellfish, and wildlife survival. In addition, the water quality shall be suitable for primary and secondary contact recreation, although other factors may limit the use for these purposes. DEC Water Quality Parameter Parameter Criteria* Reference • New York Codes, Rules and Regulations Monthly Geometric Mean Fecal Coliform ≤ 200 col/100 mL • (NYCRR Part 703.4) Monthly Geometric Mean • New York Codes, Rules and Regulations ≤ 2,400 col/100 mL Total Coliform • (NYCRR Part 703.4) 80% ≤ 5,000 col/100 mL ≥ 3.0 mg/L • New York Codes, Rules and Regulations Dissolved Oxygen • (NYCRR Part 703.3) (acute, never less than) * EPA has also proposed a potential future RWQC for enterococcus: 30-Day Rolling GM ≤ 30 col/100 mL. CSO LTCP Goals and Targets: Annual and Seasonal Bacteria Compliance Annual Dissolved Oxygen Compliance Time to Recovery for Bacteria of < 24 hours Floatables Control 15
Ongoing Receiving Water Sampling Programs *YSI Parameters include: Dissolved Oxygen, Temperature, Conductivity, and Salinity. Data is available here: http://www.nyc.gov/html/dep/html/harborwater/harbor_water_sampling_results.shtml Parameters Sampling #of Sampling Program Frequency Locations Fecal Entero *YSI Harbor Monthly (Oct – May) Survey 4 Weekly (Jun – Sept) Monitoring Sentinel Quarterly 4 Monitoring 16 *YSI Parameters include: Dissolved Oxygen, Temperature, Conductivity, and Salinity.
LTCP Sampling & Monitoring Programs Flow Monitoring • 3/1/2014 – 3/31/2015 Sampling Period: 7/1/2016 – 10/31/2016 • 5 locations • Continuously monitored • Depth & Velocity measurements Receiving Water • 14 locations • Four 4-day events • Fecal, Entero, YSI, TSS CSO / MS4 Sampling • 4 CSO, 2 MS4 locations • 4 wet weather events • Fecal, Entero, YSI, TSS, CBOD, Nitrogen SOD • 6 locations • 2 dry & 2 wet-weather events Data Sondes / ADCPs • 3 locations • Continuous over 60 days • Temperature, DO, Salinity 17
Flow Monitoring Parameter Value Duration of Study March 28, 2014 to March 27, 2015 No. of CSO Outfalls Monitored 5 No. of Monitored Rain Events per Location 60 to 119 per location No. of CSO Monitored Events per Location 24 to 51 per location Range of Monitored CSO Volume 21 MG to 440 MG per location 18
Fecal Coliform Sampling – Geometric Means January 1, 2016 to September 30, 2016 LTCP: ~6 Dry and ~44 Wet samples per location HSM: ~10 Dry and ~32 Wet samples per location 19 14
Fecal Coliform Recovery Over Time 1,000,000 2.0 Based on NC10 LTCP Receiving Water Sampling Data LGA Daily Rainfall Fecal Geomean 1.8 171,438 100,000 1.6 63,491 52,574 46,540 Fecal Coliform Geomean, cfu/100mL 18,660 1.4 10,000 6,204 1.2 3,780 3,477 2,862 2,598 Rainfall, in 1.02 Target ≤ 1,000 cfu/100mL 1,000 1.0 522 367 0.78 294 0.8 157 100 0.57 0.6 0.50 0.4 10 0.18 0.2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 0.0 7/15/2016 7/16/2016 7/17/2016 7/18/2016 7/26/2016 7/27/2016 7/28/2016 7/29/2016 7/30/2016 7/31/2016 8/1/2016 8/2/2016 8/3/2016 8/4/2016 Event #1 Event #2 Event #3 Event #4 Consecutive Rain Events Single Rain Event 20
Enterococci Sampling – Geometric Means January 1, 2016 to September 30, 2016 LTCP: ~6 Dry and ~44 Wet samples per location HSM: ~10 Dry and ~32 Wet samples per location 21 15
Enterococci Recovery Over Time 100,000 2.0 Based on NC10 LTCP Receiving Water Sampling Data LGA Daily Rainfall Enterococci Geomean 1.8 26,533 10,000 1.6 3,888 3,509 1.4 Enterococci Geomean, cfu/100mL 1,000 1.2 707 Rainfall, in 1.02 387 1.0 256 Target ≤ 110 cfu/100mL 0.78 100 0.8 87 0.57 35 0.6 0.50 24 19 12 10 0.4 10 7 5 0.18 0.2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1 0.0 7/15/2016 7/16/2016 7/17/2016 7/18/2016 7/26/2016 7/27/2016 7/28/2016 7/29/2016 7/30/2016 7/31/2016 8/1/2016 8/2/2016 8/3/2016 8/4/2016 Event #1 Event #2 Event #3 Event #4 Consecutive Rain Events Single Rain Event 22
Dissolved Oxygen Sampling – 5 th Percentile Values January 1, 2016 to September 30, 2016 LTCP: ~6 Dry and ~38 Wet samples per location HSM: ~10 Dry and ~32 Wet samples per location 23 23
Canoe Excursion Sampling Results Fecal Sampling Results: On July 20 th , 2016, DEP joined the Newtown Creek Alliance for a canoe Enterococcus Sampling Results: tour of Newtown Creek Sampling results from this excursion are within the ranges observed under the LTCP / HSM sampling programs GM of LTCP/HSM Sampling Results (1/1/16 – 9/30/16) Canoe Excursion Results (7/20/16 ) *Prior rainfall on 7/14 of 0.15-in Primary Contact Criteria • Fecal Monthly GM ≤ 200 cfu/100 mL • Entero 30-day Rolling GM ≤ 30 cfu/100 mL 24
Questions? 25
Recommend
More recommend
