Federal Register - August 18, 2021
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Source: Federal Register
Federal Register / Vol. 86, No. 157 / Wednesday, August 18, 2021 / Notices
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Figure 1. Map of Proposed Project Area
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Detailed Description of Specific Activity The existing pier at Palmer Station consists of a sheetpile bulkhead backfilled with gravel and cobble that was built in 1967. It is severely deteriorated, and needs to be replaced as soon as possible.
This project would replace the existing pier with a new steel pipe pile supported concrete deck pier, new modern energy absorbing fender system and on-site power and lighting. Work on the fendering system would be above water. In-water work with the potential to produce underwater noise includes demolition of the existing pier,
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construction of the new pier and installation of wave attenuator piles.
While piles for the wave attenuator will be installed in this project, the wave attenuator itself would be installed later.
NMFS does not expect installation of the wave attenuator to result in take.
The existing bulkhead pier must be demolished prior to construction of the new pier. The existing sheetpile cofferdam bulkhead would be demolished and the sheets would be removed by a vibratory hammer or cut off at the mudline. Sheet pile removed from the pier cell would be loaded onto the material barge for disposal. A pier cell is a structure that has hollow sections i.e., cells.
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New pile installation would include steel gravel-filled pipe piles as outlined in Table 1. The deck and pile caps for the pier are supported by the piles, which are installed in holes sockets created in the shallow bedrock by the DTH systems. Support vessels, including a tugboat, one stationary barge, a temporary floating construction platform, a 16-ft. 5-m skiff and one 200
horsepower work boat would be used for the duration of the project to complete in-water work. A separate gravel barge would deliver material at the beginning of the project, but would only be onsite for approximately 3 days.
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