Resolution 2879 - Laserfiche WebLink

Conclusion: The monitoring plan, submitted as an Appendix to the Department of Ecology's Water Quality Certification (see Exhibit 6, Water Quality Certification) represents efforts of a team of professionals from Federal, State and local agencies including the City of Everett to provide a program of maintenance and monitoring of the disposal spoils. Long term maintenance dredging will be controlled by WDOE and the Corps of Engineers through the Corps 404 permit process and WDOE's Water Quality Certification procedure. The monitoring program requires corrective action to be taken by the Navy if any failure of the aquatic disposal method occurs. The monitoring program is an acceptable long range plan for insuring that in-water disposal does not result in the degradation of the surrounding environment. 0. Finding: DREDGING - APPLICATION REQUIREMENTS Applications for dredging operation (non-maintenance) shall include the following information: 1 . Information on stability of bedlands adjacent to proposed dredging area. 2. Dredging procedure: time of dredging, method of dredging, and spoils disposal. 3. Spoils disposal area: location, size, capacity and physical and biological characteristics. Conclusion: This information has been covered in the NEPA Final EIS and NEPA Final Supplementary EIS under the dredging program. The application to the Corps of Engineers has been submitted and contains all information requested in this finding. The Corps has recommended approval of the Corps Permit, as documented in its Record of Decision. (See Exhibit 7. ) Information contained includes: 1 . Stability of bedlands (NEPA FEISS, pp III - 67 to 71 ) The site is relatively flat with typical bed slopes ranging from one to 35 feet to one to 60 feet. A geophysical survey indicates a near surface layer of deltaic sandy silts, identified as a marine mud. These marine sediments have a high water content and are underlain by undifferentiated glacial and non-glacial deposits. The site is a seismically active area (classified as zone 3 by NAVFAC P-355 and the Uniform Building Code). However, ground rupture due to faulting is not a concern for the site; all large earthquakes in the region have been deep subcrustal events at depths ranging from 20 to 40 miles below the ground surface. The deltaic silts located at the RADCAD site and upslope have low sheer strength. The potential for liquefaction of the upslope deltaic silts during earthquakes does exist but is not evaluated in terms of probability or severity. The geophysical data of bathymetry and seismic reflection show no indications of major seafloor faulting, slumping or submarine slope failure. -12-