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Resolution 2879
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Resolution 2879
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2/1/2018 11:54:41 AM
Creation date
7/6/2017 11:31:18 AM
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Resolutions
Resolution Number
2879
Date
6/10/1987
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• I� <br /> Based on the following considerations, the proposed use is not <br /> contrary to the general intent of Everett's Shoreline Master Program: <br /> Disposal of the East Waterway dredged spoils will not interfere with <br /> the normal public use of public shorelines. The disposal site is <br /> approximately 9,000 feet southwest of the waterway and at a depth of <br /> -310 and -430 feet (MLLW) . <br /> The proposed use of the site is compatible with other permitted uses <br /> in the area. The DNR disposal site is adjacent to the proposed site <br /> and PSDDA has proposed a disposal site west of the area. <br /> Dredge disposal techniques and capping of the contaminated material <br /> should assure minimal adverse effects to the shoreline environment. <br /> In addition, this staff report includes a recommendation that the <br /> City of Everett require the Navy and its contractors to clean up any <br /> debris and other contaminants that might be released into the <br /> microlayer or deposited on the shore due to dredging and spoils <br /> disposal activities. <br /> The public interest will suffer no substantial detrimental effects. <br /> L. Finding: DREDGING AND DREDGE DISPOSAL FOR HABITAT IMPROVEMENT <br /> Depositing of dredge material in water areas should be allowed only <br /> for the improvement of habitat, or where the alternative of <br /> depositing material on land is more detrimental to the shoreline <br /> resource than depositing it in the water. <br /> Viable alternatives for disposal are the Revised Application Deep <br /> Confined Aquatic Disposal (RADCAD) site and three options related to <br /> Smith Island disposal, the excavated option, the elevated option, and <br /> the elevated with use of solidification/stabilization processes. The <br /> dredging and spoils disposal program will isolate 918,000 cubic yards <br /> of contaminated material now exposed to the aquatic environment. <br /> 1. RADCAD <br /> RADCAD alternative is discussed on pages III-67 through III-71 of the <br /> NEPA FEISS. The RADCAD location was chosen by the Navy after the <br /> results of four seasonal trawls were known and the responses from <br /> resource agencies and the general public to the 15 October 1985 and <br /> 9 July 1986 Seattle District Corp public notices were considered. <br /> The CAD site was moved to reduce impacts to large populations of <br /> female crabs and bottomfish at the original and Deep Delta disposal <br /> site location. While there are some crabs and bottomfish at the <br /> RADCAD site, based on six seasonal trawls and a submarine <br /> surveillance, these resources are significantly less abundant than at <br /> the previously proposed disposal sites. Because of the longer <br /> distance from the East Waterway dredge location, increased length of <br /> floating pipeline will be required for disposal of the uncontaminated <br /> material. Such a long pipeline will be difficult to control and <br /> anchor and occasional pipe separation and anchor movement could <br /> result with a corresponding displacement of sediments a possibility. <br /> Mass release of contaminants due to dredging are expected to be 2 <br /> percent for a clamshell dredge and 1 percent for a hydraulic dredge. <br /> Mass release at the disposal site is expected to include <br /> approximately 2.5 percent to be released during barge disposal, 1+ <br /> percent to be sheared off the disposal mass during descent, and <br /> another 1+ percent to be resuspended during impact with the sea <br /> bottom. These are conservative estimates and because of the low <br /> energies at the site, the sheared and resuspended materials are <br /> expected to settle within the area to be capped. Because the capping <br /> material will be hydraulically deposited and will settle as discrete <br /> -8- <br />
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