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EAST RIVER SLUDGE

STORAGETANK REMOVAL

March 27, 2013

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Expanding Waterfront AccessBrooklyn 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 WWTPWWTP

Sludge Force Main

Sludge Force MainSludge

Loading Dock

East River Sludge Loading Facility

SludgeStorage 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 PLANto be developed prior to dredging operations

Provides data for the AIR QUALITY MANAGEMENT PLANto 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 EPASame quality assurance planSame parameters as assessed in the RISame 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?