23.60A.182

A. In shoreline environments where dredging is allowed, allowed as a special use or allowed as a shoreline conditional use it shall comply with the standards in Section 23.60A.172 and in this Section 23.60A.182 . Disposal of dredged material is regulated in Section 23.60A.184 , Standards for fill. B. Dredging for the primary purpose of obtaining fill material is prohibited except if it complies with Section 23.60A.172 . C. New development shall be sited and designed to avoid or, if that is not feasible, to minimize to the maximum extent feasible the need for new and maintenance dredging. D. Dredging shall be timed to be consistent with the state and federal regulatory agencies standards for state aquatic priority species and aquatic species protected under the Endangered Species Act. E. Dredging operations shall be designed, located, constructed, and managed to minimize impacts to stability of slopes on and off the site. F. Dredging in harbors, bays or other such basins shall prevent internal deeper pockets that create unflushed aquatic areas. G. Temporary stockpiling of dredged material in or under water is prohibited. H. Dredging of material that does not meet the federal Environmental Protection Agency and Ecology criteria for open-water disposal is allowed if the applicant demonstrates that: 1. The dredging would not cause long-term adverse impacts to water sediment quality, aquatic life or human health in adjacent areas; and 2. The dredged material will be disposed of at a dry land or contained submerged disposal site that has been approved by the federal Environmental Protection Agency and/or the Dredge Material Management Program (DMMP), or any successor agency or at a site meeting the standards of subsection 23.60A.184.E. I. Incidental dredged material resulting from the installation of a utility line or intake or outfall may remain under water if the applicant demonstrates that: 1. It can be placed without long-term adverse impacts to water quality, sediment quality, aquatic life or human health; and 2. The adverse environmental impacts of removing the material and relocating it to an open-water disposal site are greater than the adverse impacts of leaving the material at the original site. J. In applying mitigation sequencing pursuant to Section 23.60A.158 , potential adverse impacts to be addressed include, but are not limited to: turbidity; release of nutrients, heavy metals, sulfides, organic materials or toxic substances; dissolved oxygen depletion; disruption of food chains; loss of benthic productivity; disturbance of fish runs and important biological communities; and loss or modification of shallow water habitat. (Ord. 124105 , § 3, 2013.)