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Revised Public Notice, POA-2003-00502-M20, Knik Arm

Regulatory
Published March 6, 2023
Expiration date: 3/21/2023

On September 6, 2022, the U.S. Army Corps of Engineers, Alaska District published a public notice for Department of the Army (DA) permit number POA-2003-00502-M20, Knik Arm for a DA permit application from the Municipality of Anchorage, Port of Alaska (Port), to remove approximately 900 feet of unstable bulkhead and fill at the north end of the Port referred to as the North Extension Stabilization Step 1 (NES1) project. This public notice has been revised to include the following two changes: 1) The existing sheet pile bulkhead would likely become unstable as the impounded soil material is removed, so the contractor has proposed installing temporary support piles along the front of the bulkhead to safely stabilize the existing sheet pile wall during material removal (see below figure). Working on one-third of the bulkhead at a time, the contractor would start by using a vibratory hammer to install 27 temporary support piles, 24-inches to 36-inches in diameter, evenly spaced along the southernmost third of the sheet pile bulkhead. With the support in place, the contractor would begin excavation and demolition at the southernmost cell using a combination of land-side and sea-side mechanical excavation. After excavating enough material to be able to safely remove the bulkhead, the contractor would remove the sheet piles and the temporary support piles with the vibratory hammer, utilizing a work barge to haul off the removed sheet piles. The contractor would then move the 27 temporary piles northward to the next one-third of the bulkhead to repeat the process. These actions would be repeated three times in total. 2) The contractor proposes to increase the potential volume of dredged material below the waterline from 1.2 million cubic yards to 1.35 million cubic yards, as a contingency in case it is necessary to dredge deeper than originally anticipated to remove or cut-off the sheet-pile below the mudline. This would increase the potential total volume of material to be disposed of in the Anchorage Harbor in-water disposal site by 150,000 cubic yards. Also, it is now estimated that the material to be removed above the waterline would approximate 115,000 cubic yards, as opposed to the 130,000 cubic yards originally estimated, for a total of approximately 1.465 million cubic yards of material to be removed in association with the project. The project site is in Knik Arm, at the Port of Alaska, within Section 7, T. 13 N., R. 3 W., Seward Meridian; USGS Quad Map Anchorage A-8; Latitude 61.233499º N., Longitude 149.985068º W.; in Anchorage, Alaska. Please contact Heather Markway at (907) 753-2797, toll free from within Alaska at (800) 478-2712, or by email at Heather.N.Markway@usace.army.mil if further information is desired concerning this notice.