Ninilchik Revetment Replacement

DESCRIPTION OF WORK: The project includes demolition of the existing timber and concrete shoreline revetment located south of the Ninilchik Harbor entrance channel. The estimated demolition volume is approximately 4,000 cubic yards (CY). Some site preparation shall be required before constructing a new, multi-layer rock revetment over top an estimated 1,200 feet of the old revetment between approximately +10 feet mean lower low water (MLLW) and +35 feet MLLW. Selective placement will be required to create a well keyed structure of A Rock (3,000 pound) over filter layers of B Rock (300 pound), C Rock (15 pound), and geotextile fabric. The new rock revetment is anticipated to be designed with a ten foot bench at the toe to protect against scour and failure. There is no government furnished or designated rock source for this project. The government anticipates awarding a contract requiring placement of an estimated 9,400 CY of A Rock, 8,900 CY of B Rock, and 5,950 CY of C Rock. The Ninilchik shoreline consists of silts, sands, and gravels with some cobbles and boulders. The U.S. Army Corps of Engineers often places dredged material from the Ninilchik Harbor entrance channel and basin on the shoreline for purposes of beach nourishment. Contractors may not have unrestricted access to the site and shall be responsible for all real estate approvals for staging areas outside of the immediate construction footprint of the revetment. The work period is anticipated to begin 15 April 2022 and be completed no later than 31 December 2023. All work shall be accomplished in a manner that keeps the harbor accessible to boat and vehicular traffic.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.