2017 Maintenance Dredging – Gales Ferry, CT

Gales Ferry Dredging

Client: Americas Styrenics, LLC
The Allyn's Point Plant
Gales Ferry, CT
Completion Date: 2017
Total Project Value: $1,400,000

Relevant Project Features:

• Developed and Executed the SSP
• Completed Chemical and Biological Testing in accordance with USACE Protocol
• Prepared the CTDEEP and USACE Permit Application
• Prepared Plans and Specifications for Bidding and Dredging
• Provided Dredging Phase Services

RT Group, Inc. (RTG) was retained by Americas Styrenics, LLC (AmSty) to prepare Maintenance Dredging Plans and to obtain all local, state, and federal permits for dredging about 100,000 cubic yards of accumulated sediment within their Ship Berth and Turning Basin. The work was required to maintain safe access for sea-going vessels/barges to offload raw product at AmSty’s fixed timber pier, located on the Thames River.

RTG worked closely with the US Army Corps of Engineers (USACE) to develop the Sediment Sampling Plan (SSP) and collected the sediment samples in the Thames River.

The sampling effort included collecting sixteen (16) vibro-core sediment samples, which ranged from about 5 to 10 feet in length and that were collected in about 20 to 25 feet of water. RTG also collected water samples at each vibro-core sample location. In addition, reference site samples were collected from two (2) open water disposal sites in the Long Island Sound.

Gales Ferry Dredging

During the sediment sampling, wet sieve analyses were completed and the results were submitted to the USACE in “real-time” in order for the sample compositing scheme to be developed. The samples were then submitted for chemical and biological testing to RTG’s Subcontractor, AQUATEC, in accordance with USACE protocol.

Following the submittal of the test results and the receipt of a Suitability Determination for open water disposal, RTG prepared, submitted, and was granted the CTDEEP Certificate of Permission (COP) and the USACE Individual Permit to complete this project.