Bio-engineering is the preferred method of bank protection where practicable. Freshwater lake bulkhead projects shall incorporate mitigation measures as necessary to achieve no-net-loss of productive capacity of fish and shellfish habitat. The following technical provisions shall apply to freshwater bulkhead projects:
(1) The toe of the bulkhead shall be placed landward of the ordinary high water line.
(2) Rock used for the bulkhead construction shall be composed of clean, angular material of a sufficient size to prevent its being washed away by high water or wave action.
(3) Material that is waterward of the ordinary high water line shall not be utilized for backfill.
(4) Excavated or dredged material shall not be stockpiled waterward of the ordinary high water line.
(5) All trenches, depressions, or holes created within the ordinary high water line shall be backfilled prior to inundation by high water or wave action.
(6) All piling, lumber, or other materials treated with preservatives shall be sufficiently cured to minimize leaching into the water or bed. The use of wood treated with creosote or pentachlorophenol is not allowed in lakes.
[Statutory Authority: RCW 75.08.080
. WSR 94-23-058 (Order 94-160), § 220-110-223, filed 11/14/94, effective 12/15/94.]