Citywide/Open Waters CSO Long Term Control Plan
Stakeholder Meeting
The CUNY School of Law Auditorium April 16, 2019 Agenda
Topic Speaker
1 Welcome & Introduction Mikelle Adgate
Keith Mahoney, PE 2 Overview of Progress Pinar Balci, PhD
3 Next Steps Mikelle Adgate
2 Welcome & Introduction
Mikelle Adgate Senior Advisor, BPAC DEP
3 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.
Dry Weather Conditions Stormy Weather Conditions
Down Down Spout Spout
Catch Basin Catch Basin
Building Sewer Building Sewer Connection Combined Connection Combined 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). 4 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
5 LTCP Milestone Status
ID LTCP Approved? 3 1 Alley Creek 5 2 2 Westchester Creek 3 Hutchinson River 8 1 4 Flushing Creek 4 9 5 Bronx River 6 Gowanus Canal 6 7 Coney Island Creek 8 Flushing Bay 10 9 Newtown Creek 7 10 Jamaica Bay and Tributaries(1) Under DEC review LTCP in development 11 Citywide/Open Waters(2) 11 Due to DEC March 2020
(1) Jamaica Bay includes Thurston Basin, Bergen Basin, Hendrix Basin, Fresh Creek, Spring Creek, Paerdegat Basin and Jamaica Bay (2) Citywide/Open Waters LTCP includes East River, Lower Long Island Sound, Hudson River, Harlem River, Lower and Upper New York Bay, Arthur Kill and Kill Van Kull 6 Citywide/Open Waters LTCP
• Waterbody-specific CSO evaluation of Open Waters: • Harlem River • Upper and Lower New York Bay East River/Long Island Sound • Hudson River • Arthur Kill and Kill Van Kull
• Citywide/Open Waters LTCP will be submitted to DEC in March 2020
7 Overview of LTCP Progress
2018 2019 2020 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1
PUBLIC OUTREACH
DATA COLLECTION
MODEL DEVELOPMENT & CALIBRATION ALTERNATIVES MODELING
ALTERNATIVES EVALUATION
LTCP REPORT PREPARATION
8 Public Outreach Update
• Held three kick-off meetings
• Presentations are available Hudson River and Harlem River at: nyc.gov/dep/ltcp January 31, 2018
• Presentations covered: East River and . Waterbody and watershed Long Island Sound May 10, 2018 characteristics and water quality sampling . Existing and planned water quality improvement projects . LTCP modeling and alternatives development process
Lower East River, Kill van Kull, Arthur Kill, New York Bay March 27, 2018 9 Citywide/Open Waters Schedule
Retained Alternatives Stakeholder Briefings LTCP Recommended Public Meeting • Overview of LTCP Sections Plan Public Meeting • Release of Draft LTCP 1-7 Content • Presentation of LTCP Summary • Outline of LTCP Summary Recommended Plan • Presentation of Retained Document • Revised LTCP Alternatives • Updates on Progress Summary Document
APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR
2019 2020
Stakeholder Briefing LTCP Alternatives LTCP Recommended Plan Comments Due Comments Due Comments Due
Citywide/Open Waters LTCP Submittal to DEC • LTCP Summary Document • Complete LTCP Report • Response to Public Comments
10 LTCP Executive Summary – Distribution Format
The Executive Summary will be distributed in two formats, but content will be identical:
Executive Summary
1 Incorporated within LTCP Document2 Standalone Document
11 LTCP Table of Contents
The table of contents will be compliant with DEC’s requirements, containing all sections in the sequence stipulated by DEC.
12 Structure of Executive Summary
However, the Executive Summary will be structured differently. We plan to group sections that apply to all waterbodies first.
13 Structure of Executive Summary
Next, we will group sections with information unique to each waterbody into specific waterbody snapshots.
14 Structure of Executive Summary
So the structure of the Executive Summary will look like this:
15 Sample Introduction Spread
16 Sample Waterbody Specific Spread
17 Overview of Progress
Keith Mahoney, PE and Pinar Balci, PhD DEP
18 Current Water Quality Standards
New York State Saline Surface Water Quality Standards
Bacteria Class Fecal Dissolved Total Coliform Enterococcus(1) Coliform Oxygen
> 4.8 mg/L Median GM SA - (daily avg) ≤ 70 MPN/100mL ≤ 35/100mL ≥ 3.0 mg/L Monthly Median > 4.8 mg/L Monthly GM GM SB ≤ 2,400 cfu/100mL (daily avg) ≤ 200/100mL ≤ 35/100mL 80% ≤ 5,000 cfu/100mL ≥ 3.0 mg/L Monthly Median Monthly GM I ≤ 2,400 cfu/100mL - ≥ 4.0 mg/L ≤ 200/100mL 80% ≤ 5,000 cfu/100mL
Monthly Median Monthly GM SD ≤ 2,400 cfu/100mL - ≥ 3.0 mg/L ≤ 200/100mL 80% ≤ 5,000 cfu/100mL
Notes: (1) Applicable to coastal recreational waters only
19 Proposed Water Quality Standards and Classification
New York State Saline Surface Water Quality Standards
Bacteria Class Fecal Dissolved Total Coliform(1) Enterococcus(1)(2) Coliform(1) Oxygen
GM > 4.8 mg/L Median ≤ 35/100mL SA - (daily avg) ≤ 70 MPN/100mL STV ≥ 3.0 mg/L 90% ≤ 130 cfu/100mL GM Monthly Median > 4.8 mg/L Monthly GM ≤ 35/100mL SB ≤ 2,400 cfu/100mL (daily avg) Reclassified Upper and part ≤ 200/100mL STV 80% ≤ 5,000 cfu/100mL ≥ 3.0 mg/L of Lower New York Bay from 90% ≤ 130 cfu/100mL Class I to Class SB Monthly Median Monthly GM I ≤ 2,400 cfu/100mL - ≥ 4.0 mg/L ≤ 200/100mL 80%≤ 5,000 cfu/100mL
Monthly Median Monthly GM SD ≤ 2,400 cfu/100mL - ≥ 3.0 mg/L ≤ 200/100mL 80%≤ 5,000 cfu/100mL
Notes: (1) Assessed during primary contact recreational season or as necessary to protect human health (2) Applicable to coastal recreational waters only
20 Data Collection Update
• Installed regulator flow monitoring equipment • Completed flow monitoring of 20 open water regulators • Received Passaic Valley Sewerage Commission (PVSC) sampling data
21 Modeling Update
• Collection System Modeling . Calibrating to meter data . Updating Baseline Conditions Models . Incorporating citywide green infrastructure
• Water Quality Modeling . Increasing the density of the water quality model grid cells . Calibrating to NYC and NJ sampling data . Conducting preliminary gap analysis using grid cells to represent attainment
22 Fecal Attainment – Existing Conditions
2008 Annual Attainment 2008 Recreational Attainment Monthly Geomean ≤ 200 cfu/100 mL Monthly Geomean ≤ 200 cfu/100 mL (Preliminary Results) (Preliminary Results)
Attainment (%) 0708 90 95 100 0 23 Entero Attainment – Existing Conditions
2008 Recreational Attainment (GM) 2008 Recreational Attainment (STV) 30-day Rolling Geomean ≤ 35 cfu/100 mL 30-day Rolling 90th Percentile ≤ 130 cfu/100 mL (Preliminary Results) (Preliminary Results)
Attainment (%) 0708 90 95 100 0 24 Preliminary Alternatives for Review & Analysis
Source Control Green Infrastructure Storm Sewers
Pump System Parallel Bending Weirs Pump Station Fixed Weir Station Optimization Interceptor / Sewer Control Gates Expansion Optimization
Gravity Flow Tipping Pumping Station Flow Tipping with CSO Relocation to Other Watersheds Modification Conduit/Tunnel and Pumping
Water Quality / Floatables Environmental Ecological Wetland Restoration & Daylighting Control Dredging Enhancement Treatment Outfall High Rate Clarification Satellite: Retention Treatment Basin (RTB) Disinfection (HRC)
Centralized: WRRF Expansion
Storage In-System Shaft Tank Tunnel
Retained Alternatives Ongoing Projects 25 CSO Regulator Operation
Combined Sewer conveys stormwater runoff and sanitary waste to the Wastewater Resource Recovery Facility.
Stormwater Catch Basins Regulator directs combined sewage to the Runoff flows into convey stormwater into wastewater resource recovery facility. If the the combined the combined sewer. facility reaches full capacity, the combined 2 sewer. sewer flow is directed to overflow outfalls. 1 3
CSO Outfalls are locations where “combined sewer overflows” discharge. LEGEND Stormwater Runoff 4 Combined Sanitary and Stormwater Flow 6
Wastewater Resource 5 Recovery Facility treats the combined sewage and releases clean water into surrounding waterbodies. 26 Collection System Optimization
• Evaluating regulator optimization Influent alternatives using a specialized Combined optimization software Sewer Diversion Chamber • Typical optimization measures
include: Regulator Tide Gate . Increasing dry weather flow Gate connection . Weir modifications
. Localized branch sewer relief Tide Gate Chamber Overflow Weir • Strategy Assessment Criteria: Regulation Chamber . Cost Combined Sewer . Overflow volume, duration, and Overflow to timing Outfall . Outfall sensitivity (beaches, boat Diverted launches, etc.) Wastewater to . Hydraulic impacts (flooding risks) Interceptor
27 Example of Gravity Diversion Structure
New Gravity Diversion
PR-013 +/- 36 MG/yr PR-032 +/- 10 MG/yr 60” x 36” Combined Sewer
36” Hannah St. Force Main Pump Station
28 Ongoing Citywide Floatables Program
Street Sweeping Catch Basin Hooding 96% of citywide 55% Street street litter Sweeping (floatables) is captured(1)
34% Catch Basin Hoods
4% 3% WRRF Nets/Booms
Netting/Booms Wastewater Resource Recovery Facility (WRRF) Citywide Floatables Capture
(1) Source: NYC Stormwater Management Program, NYCDEP, August 2018 29 Tibbetts Brook Existing Conditions – Overflow Weir
LAKE OVERFLOW WEIR
SCHEMATIC
ENTRANCE TO COLLECTION SYSTEM 30 Tibbetts Brook Alternatives
Westchester County ALTERNATIVES Elm-Birch 1 VanCortlandt Lake Additional Storage BMP Wetlands 2 Tibbets Wetland BMP 3 Elm-Birch Wetlands BMP 4 All three above BMPs Combined 5 Daylighting Full Flow
City of New York 6 Daylighting Full Flow and BMP combination Tibbetts Wetland 7 Daylighting Base Flow 8 Daylighting Base Flow + VanCortlandt Lake
VanCortlandt 9 Daylighting Base Flow + Tibbets Wetland Lake Additional Storage 10 Daylighting Base Flow + Elm-Birch Wetlands
Harlem River 11 Daylighting Base Flow + Van Cortlandt + Elm-Birch
Daylighting Alternatives 12 Daylighting Base Flow + Van Cortlandt + Tibbets (Full Flow or Base Flow) 13 Daylighting Base Flow + Tibbets + Elm-Birch 14 Daylighting Base Flow + All three BMPs 31 Putnam Trail (CSX) – Tibbetts Brook Existing Conditions
WEST 230TH STREET NEAR HARLEM RIVER
32 DEP and DEC Tibbetts Brook Evaluations
• Compile & Analyze Existing • Survey of Existing Sewer Lines Conditions • Phase I Environmental Site • Hydrology and Hydraulics Modeling Assessment & Analyses
• Develop & Evaluate Alternatives Optional Tasks: • Feasibility Technical Memo • Limited Phase II Environmental Site Assessment • Topo Survey
33 Next Steps
Mikelle Adgate Senior Advisor, BPAC DEP
34 Citywide/Open Waters Schedule
Stakeholder Briefings Retained Alternatives LTCP Recommended • Overview of LTCP Sections Public Meeting Plan Public Meeting 1-7 Content • Release of Draft LTCP • Presentation of LTCP • Outline of LTCP Summary Summary Recommended Plan Document • Presentation of Retained • Revised LTCP • Updates on Progress Alternatives Summary Document
APR MAY JUN JUL AUG SEP OCT NOV DEC JAN FEB MAR
2019 2020
Stakeholder Briefing LTCP Alternatives LTCP Recommended Plan Comments Due May 17th Comments Due Comments Due
Citywide/Open Waters LTCP Submittal to DEC • LTCP Summary Document • Complete LTCP Report • Response to Public Comments
35 Additional Information & Resources
Visit the DEP Website for more information: www.nyc.gov/dep/ltcp
• Monthly Updates on the Citywide LTCP
• Citywide LTCP Content: sampling information, baseline information etc.
• CSO Order including LTCP Goal Statement • Links to Waterbody/Watershed Facility Plans • Presentations, Meeting Materials and Meeting Summaries • LTCP Brochure and Waterbody Fact Sheets • All Submitted LTCP Reports and Other LTCP Updates • NYC’s Green Infrastructure Reports and Grant Program • Green Infrastructure Interactive Map of Projects • NYC Waterbody Advisory Program • Upcoming Meeting Announcements
36 Thank You!
www.nyc.gov/dep/ltcp [email protected] 37