Bronx River Combined Sewer Overflow Long Term Control Plan Public Meeting #2 Review of Alternatives
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Bronx River Combined Sewer Overflow Long Term Control Plan Public Meeting #2 Review of Alternatives Casita Maria Center for Arts and Education May 7, 2015 Welcome & Introductions Eric Landau Associate Commissioner DEP 2 LTCP Process and Public Involvement Alternatives Review Meeting Bronx Borough Data Review Meeting River Community Board 2 River Keeper & Bronx River President Meeting Keeper & Bronx River Alliance LTCP Due 4/1/15 Alliance 1/22/15 2/9/15 6/30/15 5/5/15 Existing Data Alternatives Information Collection & Modeling Development LTCP DEC Review Review Analysis & Evaluation Kickoff Alternatives Final Plan Review Meeting Meeting Meeting 2/12/15 TODAY TBD ONGOING PUBLIC/STAKEHOLDER INPUT 3 Public Comments Bronx River Alliance: Bronx River has enjoyed steady improvements and has an active constituency of users, making water quality a priority for this waterbody Public Comments: • Control CSOs and address upstream issues • Making river safe for primary contact is long term goal • Consider alternatives that make the river safe for primary contact throughout the entire year and as soon as possible after a rain event 4 Bronx River Sections WESTCHESTER BRONX QUEENS BROOKLYN STATEN ISLAND Freshwater Section E. Tremont Ave Tidal Section 5 Freshwater Section – Current Uses Boat Access Points (Contains kayak/canoe launch site) 1 219th Street (Shoelace Park) 2 Forth Knox 3 Kazmiroff Blvd 1 WILLIAMSBRIDGE Portages 2 (Re-access points to get around river obstructions) BEDFORD OLINVILLE A Stone Mill – Botanical Garden PARK B Twin Dams – Bronx Zoo 3 C River Park Dam FORDHAM A BELMONT B VAN NEST EAST TREMONT Twin Dams – Bronx Zoo River Park Dam C 6 Tidal Section – Current Uses Parks & Boat Access Points (Contains kayak/canoe launch site) EAST TREMONT VAN NEST 4 West Farms Rapids 4 WEST 5 Starlight Park FARMS 6 Concrete Plant Park 7 Hunts Point Riverside Park 5 8 Soundview Park Upcoming Development 6 SOUNDVIEW Hunts Point Vision Plan 7 Soundview Park HUNTS POINT 8 7 Sampling and Modeling Jim Mueller, P.E. Assistant Commissioner DEP 8 Bronx River Drainage Area Annual Wet-Weather Discharge Volume: . ~1,950 MGal (typical year) • ~26% CSO • ~74% Direct Drainage and Stormwater Fresh Water Section: . No CSO Outfalls . 6 MS4 Outfalls ( ) . Primarily direct drainage Tidal Section: E Tremont Ave . 5 CSO Outfalls ( ) . No MS4 Outfalls NYC Westchester Drainage Area (Acres) 4,318 23,020 Served by Combined Sewers 64% N/A 9 Bronx River Classifications WESTCHESTER CLASS C BRONX Bathing/Fishing Westchester QUEENS BROOKLYN STATEN ISLAND Freshwater Section CLASS B B a t h i n g New York City E. Tremont Ave CLASS I Boating/Fishing Tidal New York City Section 10 Current Water Quality Standards Focusing only on the New York City portion of the Bronx River: Bacteria Dissolved Oxygen Section Class (mg/L) Fecal Coliform Total Coliform (col/100 mL) (col/100 mL) ≤ 2,400 Freshwater never less than 4.0 ≤ 200 (Monthly Median) NORTH of Class B (Monthly GM) and E. Tremont Ave. daily average > 5.0 80% ≤ 5,000 Tidal SOUTH of Class I ≥ 4.0 ≤ 2,000* ≤ 10,000 E. Tremont Ave. (Monthly GM) (Monthly GM) *Note: New DEC proposed rulemaking for primary contact criteria for Class I and Class SD of ≤ 200 col/100 mL for Fecal Coliform. 11 Sampling Locations LTCP Sampling: Outfall Pipe • 2 CSO (HP-007 & HP-009) • 2 Stormwater (HP-608, HP-627) Bronx River • 10 Locations (1100+ analyses) . BR0 in Westchester County . BR1 at County line Botanical . BR2 - BR9 in NYC Gardens Citizen Sampling: E Tremont Ave Bronx River Soundview • 3 Locations Near: Starlight Park . Botanical Gardens . Soundview Starlight Park Hunts Point . Hunts Point Riverside Park Riverside Park 12 Fecal Coliform Sampling Results - GMs *BR0 county line bi-weekly May 17th, 2014 to July 17th, 2014 sampling conducted outside LTCP sampling timeframe (7/25/2014 to 10/24/2014). Freshwater Tidal 10000 2000 #/100 ml 2631 2651 2232 2019 1763 1543 1000 701 489 672 794 617 262 200 #/100 ml 200 #/100 ml 223 220 future primary 180 100 159 157 contact standard Geometric Mean Geometric 38 38 Fecal Coliform (#/100 ml) (#/100Coliform Fecal 10 5 LTCP - Wet LTCP - Dry 1 0 1 2 3 4 5 6 7 8 9 10 *BR0 BR1 BR2 BR3 BR4 BR5 BR6 BR7 BR8 BR9 Sampling Locations 13 Enterococci Sampling Results - GMs *BR0 county line bi-weekly May 17th, 2014 to July 17th, 2014 sampling conducted outside LTCP sampling timeframe (7/25/2014 to 10/24/2014). Freshwater Tidal 10000 1000 931 876 684 616 315 496 391 100 139 110 98 77 Geometric Mean Mean Geometric 58 52 30 #/100 ml 43 36 future primary 30 Enterococci (#/100 ml) (#/100 Enterococci contact standard 16 10 13 9 LTCP - Wet LTCP - Dry 2 1 0 1 2 3 4 5 6 7 8 9 10 *BR0 BR1 BR2 BR3 BR4 BR5 BR6 BR7 BR8 BR9 Sampling Locations 14 DO Sampling Results – Averages *BR0 county line bi-weekly sampling May 17th, 2014 to July 17th, 2014 conducted outside LTCP sampling timeframe (7/25/2014 to 10/24/2014). No DO samples were collected. Freshwater Tidal 10 9 8 7.75 7.69 mg/L 7.40 , 7.04 7.01 6.94 7 6.42 6.88 6.91 6.88 6.34 Oxygen 6.64 6.59 6.50 6.01 Averages 6 6.06 5.63 5 mg/L Dissolved Dissolved 5 5.02 4 mg/L 4 LTCP-Wet LTCP-Dry 3 *BR0 BR1 BR2 BR3 BR4 BR5 BR6 BR7 BR8 BR9 Sampling Locations 15 WQ Attainment Summary Based on Sampling Data Model Results: No difference in annual attainment between Baseline Water Quality Model and 100% CSO Control*. All 100% Seasonal Fecal (Monthly GM ≤ 200 col/100 ml) Output 83% to 100% Annual Fecal (Monthly GM ≤ 200 col/100 ml) 61% to 100% Annual Enterococcus (30-d rolling GM ≤ 30 col/100 ml) 93% to 100% Dissolved Oxygen (Never less than 4.0 mg/L) Assumptions: (Daily Average > 5.0 mg/L) • Westchester County flows are in attainment • 2008 rainfall year *Range based on results across 9 sampling locations (BR1 to BR9). 16 Water Quality Improvement Projects Green and Grey Infrastructure Mikelle Adgate Jim Mueller, P.E. Project Manager Assistant Commissioner DEP DEP 17 GI Projects in Bronx River Watershed Built Green Infrastructure: 23 bioswales and 8 stormwater greenstreets constructed to date in HP-008 and HP-009 Bronx River Houses - NYCHA Shoelace Park - DPR Planned Projects: Flushing Creek Area-Wide Contracts: • Design will begin in HP-002, HP- 004 and HP-007 in 2015 Partnership with TPL/SCA/DOE: • P.S. 129 (in construction) Partnership with DPR: • Watson Gleason Playground GI Grant Program: • ~$1 M renovation of a Bronx Zoo parking lot with rain gardens and porous paving 18 Grey Infrastructure Installed in Bronx River Floatables Control . In-Line Netting Facilities at CSO Outfalls HP-004 & HP-009 . Mechanical Screens at Regulators CSO27 & 27A . Floatables Boom by Concrete Park CY2014: Bronx River had 415 cubic yard of floatables removed. Significant amount of tree branches. Construction Cost ~ $47M Completed in June 2012 Hunts Point WWTP 19 Additional CSO Reduction Alternatives Evaluation Jim Mueller, P.E. Assistant Commissioner DEP 20 Modeled Bronx River CSO Volumes 600 508 500 Approx. 455 10% 400 Reduction 300 454 413 (MGY) 200 CSO Discharge CSO Discharge Volume 100 2 1 41 32 0 11 9 Pre-WWFP LTCP Baseline w/ GI HP-004 HP-007 HP-008 HP-009 21 Alternatives Overview Evaluate Alternatives for Bronx River Outfalls: . HP-009 Target Outfalls . HP-007 with Largest CSO Discharges HP-004 . HP-008 . HP-004 Evaluate Floatables Control for East River Outfall: HP-008 . HP-011 Alternatives developed based on combinations of different technology options at target outfalls 22 HP-011 Bending Weir and Baffle 4-ft bending weir and baffle at Regulator 5 New Regulator Chamber with Baffle and 4-ft. Bending Weir Regulator 5 Bending Weirs HP-011 HP-011 – Bending Weir and Baffle Baffle 23 HP-009 Hydraulic Relief Raise weir at Regulator 13 Relief pipe between Regulator 13 and Bronx River siphon HP-009 – Hydraulic Relief Raise Weir in Regulator 13 by 1 ft. HP-009 6-ft diam. Conduit from Regulator 13 to Existing 10x9 CS HP-010 Hydraulic Relief Siphon Twin 7-ft 24 HP-007 Hydraulic Relief HP-007 – Hydraulic Relief 5-ft diameter relief pipe Relief Structure 27 2,700 linear feet Connect to existing HP-007 combined sewer 5-ft Diameter Relief Pipe; 2,700 LF Connect to Existing Combined Sewer Hydraulic Relief 25 HP-007 Disinfection Hypochlorite Dosing at Relief Structure 27A Disinfection in 10 x 8 ft. Outfall Conduit Disinfection in 9.25 x 8 ft. Combined Sewer HP-007 – Disinfection Relief Structure 27A Hypochlorite Dosing Locations Disinfection in 10 x 8 ft. Outfall Conduit Disinfection in 9.25 x 8 ft. Combined Sewer Disinfection HP-007 Relief Structure 27 HP-004 26 HP-009 Outfall Conduit Disinfection Diversion structure with tide gates 1,900 LF 9ft. diameter conduit with dewatering pumping HP-009 – Outfall Conduit Disinfection HP-009 Hypochlorite Storage and Diversion Structure Feed Building with Tidegates HP-010 Conduit with Dewatering Disinfection Pumping 75% Capture Dewatering Force Main New Outfall 27 HP-009 RTB Contact Tank Disinfection RTB Contact Tank Sized for 75% Control New Outfall HP-009 – RTB Contact Tank Disinfection HP-009 RTB Contact Tank Sized for 75% Control (0.85 MG) Diversion Structure with Dewatering Tidegates Force Main New outfall HP-010 28 Tunnel Tunnel 100% Capture of CSO from outfalls HP-004, HP-007, HP- 008 and HP-009: 61 MG Tunnel • 31-ft Diameter • 11,100 Linear Feet • 30.5 MGD Dewatering Pump Station 29 Evaluation of Six Alternatives Alternatives developed based on combinations of different technology options at target outfalls: Alt.