Environmental Dredging Project

Location:

Northeast River

Project Overview:

Contain hydraulic dredge site contaminated sediments within several work zones utilizing 3,400’ of double-walled TYPE 3 HD curtains to manage site turbidity.

ABASCO Contribution

Turbidity curtain design: manufacture and installation support

Type 3 HD with 7’, 10’ and 14’ depths using furling lines
Dual 5/16” top tension cables & 3/8” HG chain
22oz PVC coated fabric and 1’ & 4’ windows with 12 oz/yd non-woven polypropylene with 100 US sieve flowing 75 gpm/ft2
Aluminum ASTM Universal Slide connectors with anchor points and ASTM Toggle pins
50’ and 100’ sections using SS grommets at vertical ends with furling lines
TB-18 Tow Bridles
AS 22 Anchor packages with Danforth anchor, chain leader, ½” poly rope, A-2 Anchor Buoy
Lighted Buoys

Project Challenges and Features –

Monitored NTU Release: 5 NTU Delta, must remain within 95%
Strong winds: 30 – 40 mph
Sizable tidal exchange and winter storm surge
Strong currents during storms projected and bridge crossing currents
Two Nor’easter Storms
Dredge activity limited by herring and shellfish migration; fish corridors
Project duration exceeded one year
Filter window flow arrangement for tidal, rain and storm events

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