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POA-2003-00502-M20 Knik Arm_PN

Regulatory
Published Sept. 6, 2022
Expiration date: 10/6/2022

Municipality of Anchorage, Port of Alaska, 2000 Anchorage Port Road, Anchorage, Alaska 99501; Contact: Mr. Steve Ribuffo, 907-343-6201, steve.ribuffo@anchorageak.gov and agent HDR, Incorporated, 2525 C Street, Suite 500, Anchorage, Alaska, 99503; Contact: Mr. Michiel Holley, 907-644-2096, Michiel.Holley@hdrinc.com states the purpose is to create a new shoreline that is structurally and seismically stable and useable for port activities, while maximizing the retention of salvageable lands that were created under the Port Intermodal Expansion Project (PIEP) and supporting the improvement of hydrodynamic conditions of the USACE Anchorage Harbor project. The Port proposes to remove approximately 900 feet of unstable bulkhead and fill at the north end of the Port. The area, known as the North Extension, was constructed in 2009-2010 as part of the PIEP. The North Extension was never constructed to completion and is seismically unstable. This new proposed project, referred to as the North Extension Stabilization Step 1 (NES1) project, would remove the most seismically unstable portion (approximately half) of the North Extension. For the first stage of project, the Port will install soil improvements (deep soil mixing) along the proposed realignment of the shoreline to provide geotechnical stability to the embankment. The Port then proposes to construct an armor rock retaining wall inland of the current bulkhead; remove the fill between the existing bulkhead and new rock retaining wall to create an engineered laid-back slope with a top elevation of 38.0 feet MLLW and sloping to a toe elevation of approximately -40.0 feet MLLW; and then remove the open cell PIEP sheet pile wall that forms the current bulkhead through incrementally shearing and removing the sheet pile material and the impounded soils (PIEP fill material). The removal of fill behind the current bulkhead would require removal of approximately 1.33 million cubic yards of material, of which approximately 1.2 million cubic yards is below the waterline. The material above the waterline (approximately 130,000 cubic yards) would be excavated and separated into stockpiles of useable material and unusable material to be disposed of at a later time. The Port proposes to dredge the 1.2 million cubic yards below the waterline and place in the Anchorage Harbor in-water disposal site. The proposed project involves discharge of fill material below the high tide line of Knik Arm and construction of structures below the Knik Arm’s mean high water mark requiring require permits pursuant to Section 404 of the Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899. The project also proposes an alteration of the federal dredge limits of Anchorage Harbor, requiring review under Section 14 of the Rivers and Harbors Act of 1899 (33 U.S.C 408), hereafter referred to as Section 408. All work would be performed in accordance with the enclosed plan (sheets 1-21), dated June 2022. 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.