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 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  3 Hutchinson  8 1 4 Flushing Creek  4 9 5  6 Gowanus  6 7  8  10 9  7 10 and (1) Under DEC review LTCP in development 11 Citywide/Open Waters(2) 11 Due to DEC March 2020

(1) Jamaica Bay includes Thurston Basin, , Hendrix Basin, Fresh Creek, Creek, and Jamaica Bay (2) Citywide/Open Waters LTCP includes , Lower , , , Lower and Upper Bay, and 6 Citywide/Open Waters LTCP

• Waterbody-specific CSO evaluation of Open Waters: • Harlem River • Upper and Lower  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 Water Quality Standards

New York State Saline 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 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 Sewerage Commission (PVSC) sampling data

21 Modeling Update

• Collection System Modeling . Calibrating to meter data . Updating Baseline Conditions Models . Incorporating citywide green

• 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 Pump Station Fixed 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 Restoration & 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 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” . 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 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 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