Anacortes Waterline Replacement

(Anacortes, WA)  Landau Associates provided wetland delineation, environmental permitting, and geotechnical engineering services for the design and construction of the Anacortes Transmission Waterline Replacement, a multi-phased project which consists of approximately 13 miles of new, 24- and 36-inch diameter, steel pipe waterline that extends from the existing water treatment plant on the Skagit River to State Route (SR) 20 and Sharp’s Corner in Anacortes, Washington. The first four of the project’s six waterline segments have been constructed. Project elements included a 1,200 ft horizontal directional drilled (HDD) crossing of the Swinomish Slough; a 1,600 ft HDD crossing of the Skagit River; and three crossings of SR 20 using jack and bore techniques. One segment of the pipeline to be replaced was located on the Swinomish Indian Tribal Community (SITC) property.

Landau Associates delineated wetlands in the alignment route, prepared a wetland report, conducted shoreline and sensitive area review, and provided permitting assistance to comply with governing regulations, including the Tribal Environmental Policy Act.

Geotechnical services included engineering support and assessments during route selection, for final design, and during construction.