PORT OF SEATTLE 
MEMORANDUM 
COMMISSION AGENDA               Item No.      4b 
ACTION ITEM 
Date of Meeting      May 17, 2016 
DATE:    May 9, 2016 
TO:      Ted Fick, Chief Executive Officer 
FROM:   Stephanie Jones Stebbins, Director, Maritime Environment and Sustainability 
George Blomberg, Sr. Environmental Program Manager 
Roy Kuroiwa, Sr. Environmental Program Manager 
SUBJECT:  Approval of an Inter-Agency Agreement with Ecology to perform bank-line 
repairs at Terminal 108 West 
ACTION REQUESTED 
Request Commission authorization for the Chief Executive Officer to execute an Inter-Agency
Agreement (IAA) with the Washington State Department of Ecology (Ecology) to accept 100 
percent reimbursement of up to $25,000 to perform a one-time maintenance action at the recently
completed stabilized and rehabilitated Terminal 108 West bank-line. The funds will provide 
reimbursement of Port staff and material costs to perform this maintenance work. 
SYNOPSIS 
This project will repair approximately 125 linear feet of previously stabilized and rehabilitated 
shoreline at Terminal 108 West. Port staff will design and conduct the maintenance work. The
project cost will be 100% reimbursable through Ecology's remedial grant funds, not to exceed
$25,000.  These costs will include Port staff costs, benefits, indirect charges and internal and
external customer costs as outlined in the IAA. Following execution of the IAA, the repair work
will be implemented and completed before October 31, 2016. 
BACKGROUND 
Terminal 108 West is included in the Lower Duwamish Waterway (LDW) Superfund Site. The
Record of Decision (ROD) for the cleanup of the inwaterway portion of the site was published
in 2014. 
As a component to the overall LDW cleanup, Ecology has implemented a source control strategy
for the 32 square miles of combined sewer and stormwater drainage that serves the LDW
Superfund site, as well as control of sources of potential contamination from shoreline sites in
the waterway. The objective of the state source control strategy is to prevent recontamination of
the LDW to levels that exceed the Washington State Sediment Management Standards and the
LDW sediment cleanup goals. Ecology has identified shoreline erosion as an important
contamination and recontamination pathway, with the potential for release of previouslyplaced 
fill materials comprising LDW shorelines. 

Template revised May 30, 2013.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 9, 2016 
Page 2 of 6 
Approximately 345 linear feet of bank-line at Terminal 108 West, on the east shore of the
Duwamish Waterway (approximately river mile 0.9-1.1), was identified as a problem erosion
area by Ecology and the port, the result of vesselgenerated wakes and currents in the Duwamish
Waterway. Erosion disrupts shoreline and aquatic areas allowing previously placed fill materials
and soils to enter the LDW, reducing the upland area available for marine industrial use and,
potentially, introducing contaminants to the waterway. 
On April 9, 2014, the Port and Ecology entered into an InterAgency Agreement (IAA) No.
C1400216. As required by the IAA, in June 2015, the Port completed stabilization and
rehabilitation of approximately 345 linear feet of eroding shoreline at Terminal 108 West. 
Approximately 265 linear feet of bank-line at the project site was stabilized using alternative
techniques, including anchored, large woody debris and native riparian vegetation. Existing 
riprap slopes were stabilized in an additional 80 feet of bank-line. The project provided proof 
ofconcept for alternative stabilization techniques, combining effective control of chronic bankline
erosion with rehabilitation of important riparian habitat  beneficial to the Duwamish
Waterway. 
Due to persistent vessel generated wakes during high tide periods in the DuwamishWaterway, 
approximately 125 linear feet of the recently stabilized and rehabilitated bank-line at Terminal
108 West requires repair and maintenance. The bank-line project, as completed in June 2015, is
stable, however, post-construction inspection revealed that the outer row of anchored largewoody-debris
, installed as a water-ward barrier, protecting an up-slope, double rank of heavy,
anchored logs, has been disrupted due to tugboat wakes, a chronic problem in the Duwamish
Waterway. 
PROJECT JUSTIFICATION AND DETAILS 
Regular inspection and repair of bank-line stabilization work in tidally-influenced areas is
prudent, serving to counter-act chronic erosion and avoid and minimize maintenance costs. In
particular, inspection of the recently completed Terminal 108 West project, approximately six
months following construction, was important, in light of the alternative bank-line stabilization
techniques used at the site, to verify that the stabilization work was functioning properly and to
determine the need for any adjustments or follow-up repairs. 
The proposed bank-line maintenance actions will ensure that the previous stabilization work
continues to be successful, providing a remedy for chronic shoreline erosion. In addition, the
minor maintenance actions will guarantee that approximately 0.45 acres enhanced shoreline and
inter-tidal fish and wildlife habitat produced by the Terminal 108 West project will be a durable
contribution to the habitat goals listed in the Century  agenda. There are no additional
requirements or work the Port will need to perform in order to receive this reimbursement other
than signing the IAA and filing for reimbursement.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 9, 2016 
Page 3 of 6 
Project Objectives 
Ensure  stable  and  environmentally  beneficial  Duwamish  Waterway  bank-line
conditions at our properties 
Prevent bank-line materials from eroding and entering into the LDW 
Demonstrate LDW source control through innovative and cost-effective measures 
Reduce the Port's maintenance costs 
Demonstrate coincident benefit to Century Agenda goal of restoring, creating, and
enhancing 40 additional acres of habitat in the Green/Duwamish watershed andElliott 
Bay 
Sustain important maritime business needs in the Duwamish Waterway by ensuring
navigational access in the waterway (2015 business plan) 
Scope of Work 
Task 1: Project management: Maintain project files, prepare invoices and progress reports, and
coordinate with Ecology project manager. 
Task 2: Plans and Permitting: Preparation of detailed work plan, including specific repair and
maintenance tasks, submit for Ecology review and approval. Existing city, state, and federal
authorizations remain in place from the initial repair work, allowing for the necessary repair and
maintenance. 
Task 3: Construction: Conduct repair and maintenance tasks and record field inspections postconstruction.
This task includes resetting and adjusting existing large-woody-debris log anchor
chains and installing additional chain-binder links. The port will install and fasten up to 25
additional coir (plant fabric) bundles to fill gaps between logs where soil and plants have been
eroded. Additional native marsh vegetation will also be installed. The repair and maintenance
actions do not require excavation of sediments or use of machinery in shoreline area at the site. 
Task 4: Reporting. Prepare an as-built performance report for Ecology for review and approval.
The report will include photos, performance observations and a summary of effectiveness.
Schedule 
The proposed repair and maintenance actions will begin following execution of the IAA,
anticipated in the end of May 2016. Repair and construction plans will be completed in April
2016. Construction is expected to require five working days, with completion in May 2016. 
All project tasks and reporting will be complete, no later than October 31, 2016.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 9, 2016 
Page 4 of 6 
FINANCIAL IMPLICATIONS 
The Port will submit invoices quarterly, and receive 100% reimbursement up to the full amount
of the IAA if funding is available. 
Budget/Authorization Summary              Capital     Expense   Total Project 
Original Budget                            $0      $25,000      $25,000 
Previous Authorizations                       $0          $0          $0 
Current request for authorization                  $0          $0          $0 
Total Authorizations, including this request           $0       $25,000       $25,000 
Remaining budget to be authorized               $0          $0          $0 
Total Estimated Project Cost                    $0      $25,000      $25,000 
Project Cost Breakdown                     This Request       Total Project 
Construction                                 $19,300           $19,300 
Construction Management                       $1,000           $1,000 
Design                                      $300             $300 
Project Management                          $1,400          $1,400
Permitting                                      $0               $0 
State & Local Taxes (estimated)                     $3,000            $3,000 
Total                                        $25,000            $25,000 
Budget Status and Source of Funds 
A maximum amount of $25,000 will be spent by the Port and reimbursed by Ecology summing a
net total, including staff time and direct costs, of $0.00. 
Lifecycle Cost and Savings 
Please note that the cost for a comprehensive replacement of this section of Terminal 108 West
bank-line, should the bank fail completely, is estimated at $350,000. 
STRATEGIES AND OBJECTIVES 
The proposed bank-line repairs demonstrate alternative, cost-effective bank-line
stabilization methods. Bank-line repair actions will function as "source control" at the
Duwamish Waterway site, minimizing erosion of previously placed fill and sediments to
the waterway, a primary route of potential recontamination of the LDW Superfund site. 
Controlling the source of bank-line erosion will contribute to the health of the waterway
and adjacent communities. 
The proposed bank-line repair site, at the southwest margin of Terminal 108 West, is
adjacent to the existing Diagonal Avenue South public shoreline access site, and will
protect and enhance the public shoreline access site. 
The proposed minor maintenance actions will sustain the riparian bank-line and aquatic
area habitat enhancements accomplished by the Terminal 108 West bank-line

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 9, 2016 
Page 5 of 6 
stabilization project, confirming approximately 0.45 acres progress toward the Century
Agenda habitat goal. 
The proposed project supports port business plan goals, providing stable shoreline
conditions at an existing marine industrial asset site and aiding maritime business and
trade by reducing eroding sediments and resulting shoaling in the Duwamish Waterway. 
ALTERNATIVES AND IMPLICATIONS CONSIDERED 
Alternative (1): Do not sign the IAA, with port responsible for project repair and maintenance
costs. Defer maintenance work until additional funds can be identified. 
Cost Implications: No staff resources or construction costs for repair and maintenance actions
would be required. Future staff and construction costs would be the port's responsibility, with the
potential for greater future costs. 
Pros: 
(1) This will allow the port to defer the maintenance work.
(2) Staff resources necessary to obtain Ecology reimbursement will not be required. 
Cons: 
(1) Delay of repair and maintenance actions may lead to further shoreline erosion and
increased future repair and maintenance costs. 
(2) Ecology may not have funds for use in repair and maintenance under a future IAA. 
This is not the recommended alternative. 
Alternative (2): Do not sign the IAA and defer repair and maintenance work until the bank-line
fails, with port funds necessary for subsequent expanded scope repair. 
Cost Implications: Staff resources and construction costs necessary for timely bank-line repair
and maintenance would not be required. However, bank-line erosion would be substantial,
leading to subsequent failure of the bank-line, resulting in costs approximately ninety percent
greater than present repair and maintenance costs (Potentially up to $350,000). 
Pros:
(1) Costs for this work will be postponed 
(2) Ecology and port staff resources will not be required 
(3) Alternative (1) costs would be delayed 
Cons: 
(1) Delay of maintenance actions may lead to significant bank-line failure causing further
erosion along the shoreline and significantly increase the maintenance costs. 
(2) A catastrophic failure of the bank-line may require a complete bank replacement
resulting in increased project costs. 
(3) Cost to the Port for rehabilitation or replacement of a failed bank-line may reach
$350,000.

COMMISSION AGENDA 
Ted Fick, Chief Executive Officer 
May 9, 2016 
Page 6 of 6 
This is not the recommended alternative. 
Alternative (3): Sign the IAA, with the Port performing the work and reimbursement by
Ecology, up to $25,000.
Cost Implications: Timely repair and maintenance would be accomplished, using funds provided
by Ecology. Port repair and maintenance costs would be avoided. 
Pros:
(1) Necessary repair and maintenance work will be reimbursed by Ecology. 
(2) Timely repair and maintenance of the bank line will be accomplished 
Cons: 
(1) None 
This is the recommended alternative. 

ATTACHMENTS TO THIS REQUEST 
Currently proposed IAA (Inter Agency Agreement) 
PREVIOUS COMMISSION ACTIONS OR BRIEFINGS 
None