2018-20 Greenbank Marsh Restoration Design (Phase 2)
This page will be updated periodically as new information becomes available.
Project Updates, Reports, & Presentations:
(click underlined text to open files)
February 2020 Groundwater Impact Evaluation Report - Shannon & Wilson
February 14, 2020 Addendum to Hydraulic Modeling Documentation - Northwest Hydraulic Consultants
February 3, 2020 Project Status Update - GBBC/WICD
August 7, 2019 Hydraulic Modeling Documentation - Northwest Hydraulic Consultants
August 2019 DRAFT Hydrogeologic Report - Shannon & Wilson
June 1, 2019 Presentation on Engineering Issues - Northwest Hydraulic Consultants
June 1, 2019 Presentation on Biological Issues - Element Solutions
Conceptual Design Site Plan as of April 24, 2019:
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Greenbank Beach and Boat Club (GBBC), with the support of Whidbey Island Conservation District (WICD), has received a grant from the Washington State Recreation and Conservation Office (RCO) to fund the second phase of a multi-phased project to address GBBC's privately owned, aging tidegate system. This second phase follows the Greenbank Marsh Restoration Issues Assessment (Phase I) which was completed in November 2017. See 2016-2017 Greenbank Marsh Restoration Issues Assessment (Phase 1) or Greenbank Marsh Project Overview pages for more information regarding work leading up to Phase 2 - Restoration Design.
The goal of this second phase is to refine the conceptual "open channel" designs from Phase I into “permit-ready” designs for the subsequent construction phase. The scope of work includes completing 90% engineered designs, applying for construction permits, and continuing stakeholder outreach and consultation.
- GBBC received the grant from RCO. GBBC is contracting with WICD to handle financial and reporting tasks, oversight of technical consultants, and design/permitting tasks.
- GBBC has sole responsibility for all decisions regarding expenditure of the grant monies.
Scope of Work
- Stakeholder outreach and consultation
- Engineering Design technical analyses to be completed by consultants:
- Channel outlet design and verification of tidal conditions (based on coastal geomorphic and H&H data)
- Refine hydraulic modeling to further evaluate potential for flooding in marsh
- Geotechnical investigation and dike design
- Biological issues assessment
- Engineering design and drawings, including additional field studies
- Permit applications (including pre-application meeting with Island Co)
- Develop funding opportunities and apply for construction funding
- Start date: 1/19/18
- Stakeholder outreach: throughout grant period
- Field studies, including water level and salinity baseline monitoring: begin March 2018
- Publish RFP for engineering consultants and hire consultants: July 2018
- 90% design complete: July 2019
- Draft permit applications complete: July 2019
- End date: 7/19/19
The design phase grant application can be viewed on RCO’s Project Information System (PRISM) website at the following link https://secure.rco.wa.gov/prism/search/ProjectSnapshot.aspx?ProjectNumber=17-1140.