EAST RIVER SLUDGE STORAGE TANK REMOVAL March 27, 2013 1 - PowerPoint PPT Presentation

EAST RIVER SLUDGE STORAGE TANK REMOVAL March 27, 2013 1

Expanding Waterfront Access Brooklyn Waterfront Plan Includes: • 2-Mile area along East River for residential and open space development • Open space extension from Newtown Barge Park to Dupont Street • Greenpoint-Williamsburg Rezoning • Re-establish public’s connection to the waterfront 2

Newtown Barge Terminal Playground Expansion - Enlarge Newtown Barge Playground - Improve public access to waterfront - Demolish East River Sludge Storage Tank 3

East River Sludge Loading Facility Sludge Storage Tank Sludge Newtown Newtown n n i i Loading Dock a a Creek M M Creek e e c c r r WWTP WWTP o o F F e e g g d d u u l l S S 4

Before Demolition of Sludge Tank • New sludge loading dock must be built on the Whale Creek Canal. • New sludge vessels (3) under construction now. Two vessels must be in reliable operation before existing sludge tank is abandoned. • Perform Maintenance Dredging in portions of Newtown Creek and Whale Creek – siltation has impacted the existing navigation channel. It needs to be restored to the intended channel depth for safe navigation by sludge vessels. 5

New Sludge Loading Dock NEW SLUDGE LOADING DOCK 6

New Sludge Vessels 7

Maintenance Dredging Areas Dredging Area 8

Maintenance Dredging Depths Surface Water 0 FT MLW Draft Loaded Vessel -14 FT MLW 2 FT Safety Clearance -16 FT MLW -16 to 1-2 FT Siltation Allowance -18 FT MLW -16.5 to -18.5 FT MLW -18 to -19 FT MLW -18.5 to Clean Fill +0.5 FT -19.5 FT MLW 9

Pre-Dredge Activities � “NYSDEC SEDIMENT SAMPLING” � Characterize in-situ dredge spoils for disposal (~42,000 CY) � Are the spoils hazardous waste? � Not according to a round of sediment sampling in 2009. � Provides data for the WATER QUALITY MANAGEMENT PLAN to be developed prior to dredging operations � Provides data for the AIR QUALITY MANAGEMENT PLAN to be developed prior to dredging operations 10

Coordination with EPA � “EPA SEDIMENT SAMPLING PLAN” � Before dredging occurs, data from the dredge areas will be gathered in a manner consistent with the ongoing CERCLA RI/FS � This sampling effort is separate from the pre-dredge sediment samples required by NYSDEC for characterizing the dredged material for disposal. � Sediment sampling plan has been approved by EPA � Same quality assurance plan � Same parameters as assessed in the RI � Same laboratories for most analysis 11

Typical Dredging Operation 12

Typical Dredging Operations 13

Control Measures During Dredging Item Description Dredge Type Environmental Closed bucket Not allowed; Bucket to be lowered to the level of gunwales before release; Barge Overflow Fully loaded scows must have at least 18-inch freeboard Rinsing of Gunwales Not allowed Cycle Time Hoist speed limited to approximately 2 feet per second Silt Curtains Required Containment Booms Required Settling Prior to Decant Minimum of 24 hours but then treated (see below) Water Treatment Dewatering treatment system on the dredging barge Monitor for visual plume; TSS Monitoring TSS sampling inside and outside of the mixing zone Placement of Clean Material No less than 0.5 feet thick in the dredge area Parameter-specific water quality monitoring TBD based on in-situ results Odor (H 2 S) control Monitor for odors; utilize foam barrier if required TSS= Total suspended solids; TBD= To be determined; H 2 S= hydrogen sulfide 14

Construction Work Hours • New sludge loading dock on Whale Creek – Normal working hours: 7:00 – 3:30 • Perform Maintenance Dredging of Newtown Creek and Whale Creek – Authorized to work 24 hrs/day – USCG Notices to navigation: http://www.navcen.uscg.gov/?pageName=lnmDistrict&region=17 • Demolition of East River Storage Tank – Normal working hours: 7:00 – 3:30 15

Summary Schedule 16

QUESTIONS? 17