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

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EAST RIVER SLUDGE STORAGE TANK REMOVAL

March 27, 2013

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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

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• Enlarge Newtown

Barge Playground

• Improve public

access to waterfront

• Demolish East River

Sludge Storage Tank

Newtown Barge Terminal Playground Expansion

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Newtown Newtown Creek Creek WWTP WWTP S l u d g e F

• r

c e M a i n S l u d g e F

• r

c e M a i n

Sludge Loading Dock

East River Sludge Loading Facility

Sludge Storage Tank

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• 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.

Before Demolition of Sludge Tank

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New Sludge Loading Dock

NEW SLUDGE LOADING DOCK

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New Sludge Vessels

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Dredging Area

Maintenance Dredging Areas

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0 FT MLW

• 14 FT MLW
• 16 FT MLW
• 16 to
• 18 FT MLW
• 16.5 to
• 18.5 FT MLW
• 18.5 to
• 19.5 FT MLW
• 18 to
• 19 FT MLW

Clean Fill +0.5 FT Surface Water Draft Loaded Vessel 2 FT Safety Clearance 1-2 FT Siltation Allowance

Maintenance Dredging Depths

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“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

Pre-Dredge Activities

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“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

Coordination with EPA

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Typical Dredging Operation

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Typical Dredging Operations

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Item Description Dredge Type Environmental Closed bucket Barge Overflow Not allowed; Bucket to be lowered to the level of gunwales before release; 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 TSS Monitoring Monitor for visual plume; 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 (H2S) control Monitor for odors; utilize foam barrier if required TSS= Total suspended solids; TBD= To be determined; H2S= hydrogen sulfide

Control Measures During Dredging

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• 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

Construction Work Hours

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Summary Schedule

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QUESTIONS?