HomeMy WebLinkAboutSpecial 2022-06-13 Item Spec 2D - Contract - Gilliam Creek Fish Barrier Removal and Habitat Enhancement Design with Otak Inc for $330,622COUNCIL AGENDA SYNOPSIS
Initials
Meeting Date
Prepared by
Mayor's review
Council review
06/13/22
JR
ITEM INFORMATION
ITEM No.
Spec 2.D.
159
STAFF SPONSOR: JOSHUA HOPKINS
ORIGINAL AGENDA DATE: 06/13/22
AGENDA II'EMTITLE Gilliam
Engineering
Creek Fish Barrier Removal and Habitat Enhancement
and Design Consultant Selection and Agreement
CATEGORY ❑ Discussion
Mtg Date
Motion
Date 06/13/22
❑ Resolution
Mtg Date
❑ Ordinance
Mtg Date
❑ Bid Award
Mtg Date
❑ Public Hearing
Mtg Date
❑ Other
Mtg Date
I1
Mtg
SPONSOR Council ❑Mayor ❑HR ❑DCD ❑Finance Fire ITS P&R ❑Police 0 PW Court
SPONSOR'S A Request for Proposals (RFP) for engineering and design services was advertised in the
SUMMARY Daily Journal of Commerce and Seattle Times. Two firms submitted bids and Otak was the
highest ranking among committee members. Staff has continued positive experiences
working with contractor. Council is being asked to approve a consultant agreement with
Otak in the amount of $330,622.00 for engineering and design services for the Gilliam
Creek Fish Barrier Removal and Habitat Enhancement project.
REVIEWED BY
►I Trans&Infrastructure
❑ CommunitySvs/Safety ❑ Finance Comm. ❑ Planning/Economic Dev.
❑ Arts Comm. ❑ Parks Comm. ❑ Planning Comm.
COMMITTEE CHAIR: KATE KRULLER
❑ LTAC
DATE: 06/06/22
RECOMMENDATIONS:
SPONSOR/ADMIN.
COMMITTEE
Public Works Department
Majority Approval; Forward to Special Consent Agenda
COST IMPACT / FUND SOURCE
EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED
$330,622.00 $600,000.00 $0.00
Fund Source:
Comments: 2021 CIP, Page 85
MTG. DATE
RECORD OF COUNCIL ACTION
06/13/22
MTG. DATE
ATTACHMENTS
06/13/22
Informational Memorandum dated 06/03/22 (updated)
2021 CIP, page 85
Consultant Agreement & Exhibits
Minutes from Transportation and Infrastructure Committee meeting of 06/06/22
159
160
City of Tukwila
Allan Ekberg, Mayor
Public Works Department - Hari Ponnekanti, Director/City Engineer
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Services Committee
FROM: Hari Ponnekanti, Public Works Director/ City Engineer
BY: Joshua Hopkins, Surface Water Project Manager
CC: Mayor Allan Ekberg
DATE: June 3, 2022, (revised after 6/6 TISC meeting)
SUBJECT: Gilliam Creek Fish Barrier Removal and Habitat Enhancement
Project No. 99830105
Engineering and Design Consultant Selection and Agreement
ISSUE
Approve a contract with Otak to provide engineering and design services for the Gilliam Creek Fish Barrier Removal and
Habitat Enhancement project in the amount of $330,622.00 361,011.82.
BACKGROUND
The Gilliam Creek Fish Barrier Removal and Habitat Enhancement project was established as a City CIP project in 2019, it is
a priority project with Water Resource Inventory (WRIA) 9 and the Salmon Recovery Fund Board. The primary goals of this
project are to restore fish passage between Gilliam Creek and the Green River, enhance habitat, and maintain or improve
flood protection. This contract will analyze three alternatives and establish the basis for developing a preferred alternative that
will move forward to full design.
ANALYSIS
A Request for Proposals (RFP) for engineering and design services was advertised in the Daily Journal of Commerce and
Seattle Times. Two firms submitted proposals. The proposals were scored according to predefined criteria by a selection
committee. Otak's proposal was the highest-ranking among committee members. The City has contracted with Otak for
engineering and design services for the Riverton Creek Flap Gate Removal project and is currently under contract for the
Stormwater Management Action Plan (SMAP). Staff have had positive experience and continue to be very satisfied with
Otak's work.
FISCAL IMPACT
Otak has provided a cost not to exceed $330,622.00 364,014.82 to perform engineering and design services. The project
costs are within the CIP 2021-2023 biennium budget. The City has also secured $600,000.00 in grant funding from the King
County Recreation and Conservation Office and King County Flood Control District. The received grants are sufficient to cover
the costs of this contract.
Cost Estimate
Design Contract $ 330,622.00
Sales Tax (10.1%) 33,392.82
Total $ 330,622.00
2021-2023 Design Budget
Grant Funding $600,000.00
RECOMMENDATION
Council is being asked to approve a consultant agreement with Otak in the amount of $330,622.00 364,011.82 for engineering
and design services for the Gilliam Creek Fish Barrier Removal and Habitat Enhancement project and consider this item on
the Consent Agenda at the June 13, 2022, Special Council Meeting.
Attachments: 2021 CIP, page 85
Consultant Agreement & Exhibits
161
162
PROJECT:
DESCRIPTION:
JUSTIFICATION:
STATUS:
MAINT. IMPACT:
COMMENT:
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2021 to 2026
Gilliam Creek Fish Barrier Removal
Project No. 99830105
Construct fish passage improvements at existing flap gate and restore salmonid habitat; replace flap gate
which may include a self-regulating tide gate or flood wall.
Enable fish access to lower Gilliam Creek under wider range of flow conditions; fish barrier per WDFW and
City; WRIA 9 salmon habitat project.
Analysis of lower Gilliam Creek is being conducted in 2018 to determine the best solution for fish passage
and to address potential flooding.
Likely a shift in maintenance commitments with potential elimination of flapgate maintenance.
In 2020, SRFB listed as Project of Concern, WRIA pulling funding from this cycle; BA Fish Barrier Board -
scored 63 of 94; outcomes yet to be determined; $100K allocated in CWM via WRIA 9.
FINANCIAL Through Estimated
(in $000's)
2019 2020 2021
2022 2023 2024 2025 2026 BEYOND TOTAL
EXPENSES
Project Location
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Design
60
936
536
405
,
IP
1,937
Land (R/W)
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A/ A,
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7 i
0
Monitoring
nth
47
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0
Const. Mgmt.
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752
400
87$(1$[ 1 i
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1152
Construction
5,200
2,000
7,200
TOTAL EXPENSES
60
0
936
536
405
5,952
2,400
0
0
10,289
FUND SOURCES
Awarded Grant
0
Proposed Grant
708
350
258
4,760
1,000
7,076
Mitigation Actual
0
Mitigation Expected
0
City Oper. Revenue
60
0
228
186
147
1,192
1,400
0
0
3,213
TOTAL SOURCES
60
0
936
536
405
5,952
2400
0
0
10,289
2021 - 2026 Capital Improvement Program
85
163
Project Location
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2021 - 2026 Capital Improvement Program
85
163
164
City of Tukwila
6200 Southcenter Boulevard, Tukwila WA 98188
Contract Number:
PROFESSIONAL SERVICES AGREEMENT
(Includes consultants, architects, engineers, accountants, and other professional services)
THIS AGREEMENT is entered into between the City of Tukwila, Washington, hereinafter
referred to as "the City", and OTAK, Inc., hereinafter referred to as "the Consultant", in consideration
of the mutual benefits, terms, and conditions hereinafter specified.
1. Project Designation. The Consultant is retained by the City to perform engineering and
design services in connection with the project titled Gilliam Creek Fish Barrier Removal and
Habitat Enhancement.
2. Scope of Services. The Consultant agrees to perform the services, identified on Exhibit "A"
attached hereto, including the provision of all labor, materials, equipment and supplies.
3. Duration of Agreement; Time for Performance. This Agreement shall be in full force and
effect for a period commencing upon execution and ending March 31, 2023, unless sooner
terminated under the provisions hereinafter specified. Work under this Agreement shall
commence upon written notice by the City to the Consultant to proceed. The Consultant shall
perform all services and provide all work product required pursuant to this Agreement no later
than March 31, 2023 unless an extension of such time is granted in writing by the City.
4. Payment. The Consultant shall be paid by the City for completed work and for services
rendered under this Agreement as follows:
A. Payment for the work provided by the Consultant shall be made as provided on Exhibit
"B" attached hereto, provided that the total amount of payment to the Consultant shall not
exceed $330,622.00 without express written modification of the Agreement signed by the
City.
B. The Consultant may submit vouchers to the City once per month during the progress of
the work for partial payment for that portion of the project completed to date. Such
vouchers will be checked by the City and, upon approval thereof, payment shall be made
to the Consultant in the amount approved.
C. Final payment of any balance due the Consultant of the total contract price earned will be
made promptly upon its ascertainment and verification by the City after the completion of
the work under this Agreement and its acceptance by the City.
D. Payment as provided in this section shall be full compensation for work performed,
services rendered, and for all materials, supplies, equipment and incidentals necessary to
complete the work.
E. The Consultant's records and accounts pertaining to this Agreement are to be kept
available for inspection by representatives of the City and the state of Washington for a
period of three (3) years after final payments. Copies shall be made available upon
request.
165
5. Ownership and Use of Documents. All documents, drawings, specifications and other
materials produced by the Consultant in connection with the services rendered under this
Agreement shall be the property of the City whether the project for which they are made is
executed or not. The Consultant shall be permitted to retain copies, including reproducible
copies, of drawings and specifications for information, reference and use in connection with
the Consultant's endeavors. The Consultant shall not be responsible for any use of the said
documents, drawings, specifications or other materials by the City on any project other than
the project specified in this Agreement.
6. Compliance with Laws. The Consultant shall, in performing the services contemplated by
this Agreement, faithfully observe and comply with all federal, state, and local laws, ordinances
and regulations, applicable to the services rendered under this Agreement.
7. Indemnification. The Consultant shall defend, indemnify and hold the City, its officers,
officials, employees and volunteers harmless from any and all claims, injuries, damages,
losses or suits including attorney fees, arising out of or resulting from the acts, errors or
omissions of the Consultant in performance of this Agreement, except for injuries and damages
caused by the sole negligence of the City.
Should a court of competent jurisdiction determine that this Agreement is subject to RCW
4.24.115, then, in the event of liability for damages arising out of bodily injury to persons or
damages to property caused by or resulting from the concurrent negligence of the Consultant
and the City, its officers, officials, employees, and volunteers, the Consultant's liability
hereunder shall be only to the extent of the Consultant's negligence. It is further specifically
and expressly understood that the indemnification provided herein constitutes the Consultant's
waiver of immunity under Industrial Insurance, Title 51 RCW, solely for the purposes of this
indemnification. This waiver has been mutually negotiated by the parties. The provisions of
this section shall survive the expiration or termination of this Agreement.
8. Insurance. The Consultant shall procure and maintain for the duration of the Agreement,
insurance against claims for injuries to persons or damage to property which may arise from
or in connection with the performance of the work hereunder by the Consultant, its agents,
representatives, or employees. Consultant's maintenance of insurance as required by the
agreement shall not be construed to limit the liability of the Consultant to the coverage provided
by such insurance, or otherwise limit the City's recourse to any remedy available at law or in
equity.
A. Minimum Amounts and Scope of Insurance. Consultant shall obtain insurance of the
types and with the limits described below:
1. Automobile Liability insurance with a minimum combined single limit for bodily injury
and property damage of $1,000,000 per accident. Automobile Liability insurance
shall cover all owned, non -owned, hired and leased vehicles. Coverage shall be
written on Insurance Services Office (ISO) form CA 00 01 or a substitute form
providing equivalent liability coverage. If necessary, the policy shall be endorsed to
provide contractual liability coverage.
2. Commercial General Liability insurance with limits no less than $2,000,000 each
occurrence, $2,000,000 general aggregate. Commercial General Liability
insurance shall be at least as broad as ISO occurrence form CG 00 01 and shall
cover liability arising from premises, operations, stop -gap independent contractors
and personal injury and advertising injury. The City shall be named as an
additional insured under the Consultant's Commercial General Liability insurance
policy with respect to the work performed for the City using an additional insured
endorsement at least as broad as ISO endorsement form CG 20 26.
3. Workers' Compensation coverage as required by the Industrial Insurance laws of
the State of Washington.
CA revised May 2020
166
Page 2
4. Professional Liability with limits no less than $2,000,000 per claim and $2,000,000
policy aggregate limit. Professional Liability insurance shall be appropriate to the
Consultant's profession.
B. Public Entity Full Availability of Contractor Limits. If the Contractor maintains higher
insurance limits than the minimums shown above, the Public Entity shall be insured for the
full available limits of Commercial General and Excess or Umbrella liability maintained by
the Contractor, irrespective of whether such limits maintained by the Contractor are greater
than those required by this Contract or whether any certificate of insurance furnished to
the Public Entity evidences limits of liability lower than those maintained by the Contractor.
C. Other Insurance Provision. The Consultant's Automobile Liability and Commercial
General Liability insurance policies are to contain, or be endorsed to contain that they shall
be primary insurance with respect to the City. Any Insurance, self-insurance, or insurance
pool coverage maintained by the City shall be excess of the Consultant's insurance and
shall not be contributed or combined with it.
D. Acceptability of Insurers. Insurance is to be placed with insurers with a current A.M.
Best rating of not less than A:VII.
E. Verification of Coverage. Consultant shall furnish the City with original certificates and a
copy of the amendatory endorsements, including but not necessarily limited to the
additional insured endorsement, evidencing the insurance requirements of the Contractor
before commencement of the work. Upon request by the City, the Consultant shall furnish
certified copies of all required insurance policies, including endorsements, required in this
Agreement and evidence of all subcontractors' coverage.
F. Notice of Cancellation. The Consultant shall provide the City with written notice of any
policy cancellation, within two business days of their receipt of such notice.
G. Failure to Maintain Insurance. Failure on the part of the Consultant to maintain the
insurance as required shall constitute a material breach of contract, upon which the City
may, after giving five business days notice to the Consultant to correct the breach,
immediately terminate the contract or, at its discretion, procure or renew such insurance
and pay any and all premiums in connection therewith, with any sums so expended to be
repaid to the City on demand, or at the sole discretion of the City, offset against funds due
the Consultant from the City.
9. Independent Contractor. The Consultant and the City agree that the Consultant is an
independent contractor with respect to the services provided pursuant to this Agreement.
Nothing in this Agreement shall be considered to create the relationship of employer and
employee between the parties hereto. Neither the Consultant nor any employee of the
Consultant shall be entitled to any benefits accorded City employees by virtue of the services
provided under this Agreement. The City shall not be responsible for withholding or otherwise
deducting federal income tax or social security or for contributing to the state industrial
insurance program, otherwise assuming the duties of an employer with respect to the
Consultant, or any employee of the Consultant.
10. Covenant Against Contingent Fees. The Consultant warrants that he has not employed or
retained any company or person, other than a bonafide employee working solely for the
Consultant, to solicit or secure this contract, and that he has not paid or agreed to pay any
company or person, other than a bonafide employee working solely for the Consultant, any
fee, commission, percentage, brokerage fee, gifts, or any other consideration contingent upon
or resulting from the award or making of this contract. For breach or violation of this warrant,
the City shall have the right to annul this contract without liability, or in its discretion to deduct
from the contract price or consideration, or otherwise recover, the full amount of such fee,
commission, percentage, brokerage fee, gift, or contingent fee.
CA revised May 2020
Page 3
167
11. Discrimination Prohibited. Contractor, with regard to the work performed by it under this
Agreement, will not discriminate on the grounds of race, religion, creed, color, national origin,
age, veteran status, sex, sexual orientation, gender identity, marital status, political affiliation,
the presence of any disability, or any other protected class status under state or federal law,
in the selection and retention of employees or procurement of materials or supplies.
12. Assignment. The Consultant shall not sublet or assign any of the services covered by this
Agreement without the express written consent of the City.
13. Non -Waiver. Waiver by the City of any provision of this Agreement or any time limitation
provided for in this Agreement shall not constitute a waiver of any other provision.
14. Termination.
A. The City reserves the right to terminate this Agreement at any time by giving ten (10) days
written notice to the Consultant.
B. In the event of the death of a member, partner or officer of the Consultant, or any of its
supervisory personnel assigned to the project, the surviving members of the Consultant
hereby agree to complete the work under the terms of this Agreement, if requested to do
so by the City. This section shall not be a bar to renegotiations of this Agreement between
surviving members of the Consultant and the City, if the City so chooses.
15. Applicable Law; Venue; Attorney's Fees. This Agreement shall be subject to, and the
Consultant shall at all times comply with, all applicable federal, state and local laws,
regulations, and rules, including the provisions of the City of Tukwila Municipal Code and
ordinances of the City of Tukwila. In the event any suit, arbitration, or other proceeding is
instituted to enforce any term of this Agreement, the parties specifically understand and agree
that venue shall be properly laid in King County, Washington. The prevailing party in any such
action shall be entitled to its attorney's fees and costs of suit. Venue for any action arising
from or related to this Agreement shall be exclusively in King County Superior Court.
16. Severability and Survival. If any term, condition or provision of this Agreement is declared
void or unenforceable or limited in its application or effect, such event shall not affect any other
provisions hereof and all other provisions shall remain fully enforceable. The provisions of this
Agreement, which by their sense and context are reasonably intended to survive the
completion, expiration or cancellation of this Agreement, shall survive termination of this
Agreement.
17. Notices. Notices to the City of Tukwila shall be sent to the following address:
City Clerk
City of Tukwila
6200 Southcenter Boulevard
Tukwila, WA 98188
Notices to Consultant shall be sent to the following address:
Otak
11241 Willow Rd NE, Suite 200
Redmond, WA 98052
18. Entire Agreement; Modification. This Agreement, together with attachments or addenda,
represents the entire and integrated Agreement between the City and the Consultant and
supersedes all prior negotiations, representations, or agreements written or oral. No
amendment or modification of this Agreement shall be of any force or effect unless it is in
writing and signed by the parties.
CA revised May 2020
168
Page 4
DATED this day of , 20
CITY OF TUKWILA CONSUL iANi
Allan Ekberg, Mayor
Attest/Authienticated:
By Pitowd
Printed Name: Russell Gaston
i itle: Principal
Approved as to Form:
City Clerk, Christy O'Flaherty Office of the City Attorney
GA revised May 2020
Page b
169
EXHIBIT A
SCOPE OF WORK
DESIGN/ENGINEERING SERVICES
City of Tukwila
Gilliam Creek Fish Barrier Removal and Habitat Enhancement Project
OTAK Project No. 20610
May 24, 2022
Introduction and Background
The City plans to develop fish passage improvements to Gilliam Creek at the confluence of Gilliam Creek and the
Green River at River Mile (RM) 12.5. The site extends approximately 675 feet upstream along Gilliam Creek. The
project will remove fish barriers and restore fish access to Gilliam Creek while maintaining or improving existing
flood protection. This project will restore access and shoreline habitat as part of a watershed -wide effort to restore
ESA -listed Chinook salmon and will be designed to allow juvenile fish access between the creek and the river,
which are tidally influenced. Habitat enhancements will occur both upstream and downstream of the existing
culvert. The project will also address recreational, aesthetic and educational opportunities and constraints
associated with the adjacent Green River Trail and trailside park area. The project area is constrained by local
roads, 1-405, regional and local utilities and commercial land use.
SCHEDULE: The anticipated project schedule is to have notice to proceed in late June and preferred alternative
selected in November 2022. If requested, during the Alternatives Analysis, Otak will prepare a scope amendment
for 30% Design of the preferred alternative that will continue from December 2022 into early 2023.
The Scope of Services is described in detail in the following sections.
1.0 Project Management and Coordination
1.1 Coordination with City
Otak will coordinate with the City of Tukwila on a regular basis by phone and email to keep the City's project
manager informed about project progress, project issues and schedule. Otak will assist in scheduling project
related meetings, reviews, and other coordination activities needed to keep the project moving forward. Regular
communication with the City will occur on a bi-weekly basis, and a status report will be provided to the City before
each meeting summarizing the status of action items and deliverables.
1.2 Preparation of Work Plan
Otak will prepare a preliminary Work Plan prior to the project kickoff meeting. The Work Plan will define project
goals and design criteria, communications, deliverables, and quality control requirements. A project schedule (MS
Project) will be developed and maintained as part of the Plan. The Work Plan will be updated after the project
kickoff meeting, subject to comments received. The Plan will include a Risk Register that will summarize key
issues that are at risk of impacting the scope and schedule and the mitigation strategy.
Otak — Scope of Work
170
1.3 Meetings
This scope assumes a total of four (4) one and a half-hour online meetings between the City and Otak attended
by three (3) Otak staff. The purpose of these meetings will be to discuss Otak's initial recommendations and key
project issues that will guide the design. The meetings included within this Task do not include individual meetings
identified in subsequent tasks below.
1.4 Project Monitoring and Reporting
Project monitoring and reporting will include the coordination of design team members, internal project
scheduling, and the preparation of a monthly progress report and a monthly billing statement.
TASK 1 DELIVERABLES
• Weekly project reports submitted to the City by email (electronic PDF file format)
• Work Plan
• Schedule Updates
• Meeting minutes for up to four key meetings during Phase Ito clarify and document project decisions
• Monthly progress report and monthly invoice
TASK 1 ASSUMPTIONS
• The duration for Phase I of the project is assumed not to extend beyond March 31, 2023 Project
management services for Phase II of the project will added later under the Phase II scope.
• Project schedules and work plans will be updated every two weeks.
2.0 Intake Review
2.1 Data Review and Desktop Assessment
Otak will obtain and provide a desktop assessment and evaluation of all available information from the City
regarding the existing levee system, stream, roadway, and outfall; including but not limited to GIS data, design
calculations, connecting stormwater conveyance, as -built drawings, maintenance records, etc. Otak will also
review the preliminary design work performed at the site by others including:
Y Hydrologic Model electronic files
Y Hydraulic Model electronic files (HEC -RAS)
Y Topographic survey information including ACAD electronic files
Y Environmental Assessment Memos
As described under Task 5 below, we assume that the previous Hydrologic Model, by others, will be adequate for
design and will only require updates by Otak. If the files are not able to be imported by Otak for updating, the City
will be notified of additional work required for full development of new modeling files.
2.2 Initial Site Visit
An initial site visit to the project will be conducted to visually verify the site conditions and issues identified through
the desktop review. This visit will include meeting onsite with the City engineering staff and/or maintenance
personal to discuss their observations about the facilities on-site. Initial site visit will include review of site
conditions such as:
• Condition of existing infrastructure such as the culvert, flap gate, headwalls, and roadway retaining wall
• Existing channel stability
• Adjacent private/public improvements that will require restoration if disturbed
• Construction access issues
Otak — Scope of Work
171
• Surface evidence of existing underground utilities
• Existing topography
To maximize efficiency, we assume that the field visits and on-site meetings with City staff for this Task can be
performed on the same day.
The site visit will be attended by up to four Otak staff including a Hydraulic Engineer, Structural Engineer, Wetland
Ecologist, and Geomorphologist.
3.0 Environmental/Permitting Support
3.1 Wetland and Stream Delineation and Habitat Assessment Report
Otak will conduct wetland and stream delineations and stream habitat assessment within the identified project
area from the Green River to the next culvert upstream of and west of 66th Avenue South. Stream habitat will be
characterized to document baseline conditions to support restoration design and permitting pathways for
regulatory compliance. The delineated wetland boundaries and ordinary high water (OHW) line will be marked
with flagging or wire flag stakes as appropriate, and surveyed by Otak. The area for the wetland and OHW
flagging will extend 150 feet upstream and downstream from the tide gate along the left bank of the Green River,
and west of 66th Avenue South along Gilliam Creek up to the next culvert and between 1-405 and Tukwila
Boulevard.
Wetlands will be delineated using the Corps of Engineers Wetlands Delineation Manual (1987) as amended, and
the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains Valleys,
and Coast Region (2010) as required by King County, WDFW, Ecology, and the Corps of Engineers. All
delineated wetlands will be rated using the Washington State Wetland Rating System for Western Washington —
2014 Update (Ecology Publication No. 14-06-029) to classify wetlands and determine buffer widths per the City of
Tukwila's critical areas ordinance (TMC 18.45). The OHW line on the Green River and Gilliam Creek will be
delineated in accordance with USACE Regulatory Guidance Letter 05-05 (Ordinary High Water Mark
Identification) and Determining the Ordinary High Water Mark for Shoreline Management Act Compliance in
Washington State (Ecology 2016).
Stream habitat surveys will be conducted on Gilliam Creek to document existing conditions using methods
modified from Timber, Fish, and Wildlife protocols (Schuett-Hames, et al. 1999). Quantitative and qualitative field
measurements will be recorded to assess habitat unit complexity, wood quantity and dimensions, spawning
gravel, pool quality, canopy cover, and channel geometry.
Otak will prepare a Wetland and Stream Delineation and Habitat Assessment Report in accordance with state and
federal standards, including special flood hazard areas, wetlands, and fish and wildlife habitat conservation areas
(FWHCAs).
3.2 Permitting and Environmental Review Memorandum
Otak will prepare a Permitting and Environmental Review Memorandum (PERM) based on the preliminary design
for the project. The PERM will include a summary of existing conditions and describe anticipated impacts to
regulated environmental areas. A regulatory compliance and permit strategy for local, state, and federal agencies
will be developed to authorize future construction. The PERM will address scheduling implications and assess
mitigation needs based on project impacts for mitigation planning prior to submitting applications. The PERM will
also address strategies for compliance with the Endangered Species Act, Magnusson Stevens Fisheries Act, and
Section 106 of the National Historic Preservation Act. Potential for a Fish Habitat Enhancement Project
designation will be evaluated. This task includes coordinating with the USACE regarding the applicability of
"Section 408" for work on federally authorized projects as required under the Rivers and Harbors Act of 1899.
Otak — Scope of Work
172
• Surface evidence of existing underground utilities
• Existing topography
To maximize efficiency, we assume that the field visits and on-site meetings with City staff for this Task can be
performed on the same day.
The site visit will be attended by up to four Otak staff including a Hydraulic Engineer, Structural Engineer, Wetland
Ecologist, and Geomorphologist.
3.0 Environmental/Permitting Support
3.1 Wetland and Stream Delineation and Habitat Assessment Report
Otak will conduct wetland and stream delineations and stream habitat assessment within the identified project
area from the Green River to the next culvert upstream of and west of 66th Avenue South. Stream habitat will be
characterized to document baseline conditions to support restoration design and permitting pathways for
regulatory compliance. The delineated wetland boundaries and ordinary high water (OHW) line will be marked
with flagging or wire flag stakes as appropriate, and surveyed by Otak. The area for the wetland and OHW
flagging will extend 150 feet upstream and downstream from the tide gate along the left bank of the Green River,
and west of 66th Avenue South along Gilliam Creek up to the next culvert and between 1-405 and Tukwila
Boulevard.
Wetlands will be delineated using the Corps of Engineers Wetlands Delineation Manual (1987) as amended, and
the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains Valleys,
and Coast Region (2010) as required by King County, WDFW, Ecology, and the Corps of Engineers. All
delineated wetlands will be rated using the Washington State Wetland Rating System for Western Washington —
2014 Update (Ecology Publication No. 14-06-029) to classify wetlands and determine buffer widths per the City of
Tukwila's critical areas ordinance (TMC 18.45). The OHW line on the Green River and Gilliam Creek will be
delineated in accordance with USACE Regulatory Guidance Letter 05-05 (Ordinary High Water Mark
Identification) and Determining the Ordinary High Water Mark for Shoreline Management Act Compliance in
Washington State (Ecology 2016).
Stream habitat surveys will be conducted on Gilliam Creek to document existing conditions using methods
modified from Timber, Fish, and Wildlife protocols (Schuett-Hames, et al. 1999). Quantitative and qualitative field
measurements will be recorded to assess habitat unit complexity, wood quantity and dimensions, spawning
gravel, pool quality, canopy cover, and channel geometry.
Otak will prepare a Wetland and Stream Delineation and Habitat Assessment Report in accordance with state and
federal standards, including special flood hazard areas, wetlands, and fish and wildlife habitat conservation areas
(FWHCAs).
3.2 Permitting and Environmental Review Memorandum
Otak will prepare a Permitting and Environmental Review Memorandum (PERM) based on the preliminary design
for the project. The PERM will include a summary of existing conditions and describe anticipated impacts to
regulated environmental areas. A regulatory compliance and permit strategy for local, state, and federal agencies
will be developed to authorize future construction. The PERM will address scheduling implications and assess
mitigation needs based on project impacts for mitigation planning prior to submitting applications. The PERM will
also address strategies for compliance with the Endangered Species Act, Magnusson Stevens Fisheries Act, and
Section 106 of the National Historic Preservation Act. Potential for a Fish Habitat Enhancement Project
designation will be evaluated. This task includes coordinating with the USACE regarding the applicability of
"Section 408" for work on federally authorized projects as required under the Rivers and Harbors Act of 1899.
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3.3 Impacts Assessment for Mitigation Planning
Otak will prepare an impacts assessment based on the preferred alternative and a conceptual
mitigation/restoration plan to satisfy regulatory requirements regarding no net loss of resource functions. The
project design is anticipated to include stream restoration components that will be compatible with special flood
hazard area standards. The conceptual mitigation plan will include a restoration analysis per permitting
requirements, and is intended for internal planning purposes only. The conceptual mitigation plan will be prepared
as a technical memorandum; permit application drawings are not included in this task.
On-site mitigation opportunities will be identified in the tributary corridor for the conceptual mitigation plan.
Construction in -water work methods will be incorporated, such as timing restrictions and work area isolation to
minimize potential adverse impacts to aquatic resources in the tributary. The conceptual mitigation plan will
document avoidance and minimization measures taken during development of the preliminary design to reduce
project impacts to wetland and stream habitats.
3.4 Geomorphic Assessment
3.4.1 Background Data Collection and Review
Otak personnel will review available data and information and perform a field assessment to document existing
geomorphic conditions and collect field measurements at the road crossing, in the immediate area upstream and
downstream of the crossing. A suitable reference reach is not anticipated at the site due to the modified channel
conditions. Otak will collect bankfull width measurements. Due to tidal influence and the tide gate at the River, the
natural conditions tidal prism, and tidal channel development width will be considered when recommending a
channel width.
Prior to the site geomorphic field assessment (Task 3.4.2), Otak personnel will compile and review available data
and background information applicable to the crossing site. This may include information such as historical aerial
photographs, Government Land Office (GLO) maps, LiDAR imaging, surficial geology, FEMA flood maps, DNR
hydrography information, topographic survey, and soils information.
3.4.2 Geomorphic Field Assessment
A geomorphic field assessment will be conducted by Otak personnel. This assessment includes qualitative and/or
quantitative evaluations of: bed material (type), particle size distribution (pebble counts), sediment transport
setting, channel morphology, large woody material (LWM) occurrence, channel migration potential, riparian
conditions, bankfull widths, beaver activity and man-made channel alterations/constraints and hydraulic controls.
In addition, the reference reach will be field located, if applicable. Conditions will be evaluated upstream and
downstream of the crossing, and within the reference reach.
This field data will be used to inform the:
• Bed material characteristics
• Channel geometry dimensions and bed slope
• Channel morphology
• Reach -scale channel processes including sediment sources, deposition and erosion
• Relative abundance of large and small woody material and their effects on channel stability and planform
The field conditions and assessment will be summarized in the Geomorphic Assessment Memorandum
(Task 3.4.4).
3.4.3 Bankfull Width Memorandum
Otak will collect up to ten bankfull width (BFW) measurements within the project site during the geomorphic field
assessment. The BFWs will be flagged in the field for subsequent location and measurement confirmation with
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the agencies and Tribes. Upon completion of the field BFW collections, a draft memorandum will be prepared
summarizing the BFW locations and field measurements. This memorandum will serve as the basis for the BFW
site concurrence meeting and will be provided to the agencies and Tribes prior to the site visit.
Otak will facilitate the on-site meeting with the agencies and Tribes (See Task 9.2). Review and agreement of
BFWs will occur during this on-site meeting. The BFW agreed upon by the agencies and Tribes during the on-site
field concurrence meeting will be presented in the final BFW memorandum and incorporated into the fish passage
and habitat enhancement design.
3.4.4 Geomorphic Assessment Memorandum
Otak will prepare a draft geomorphic assessment memorandum. This memorandum will summarize the existing
geomorphic conditions at the site, based on the background data review and field data collection. In addition, this
memorandum will provide the geomorphic recommendations to support the structure design including
recommended bed material sizing, channel dimensions and planform, bed slope and large woody material. The
final BFW memorandum will be attached as an appendix to this memorandum.
TASK 3.4 DELIVERABLES
• Bankfull Width Memorandum (Draft and Final, electronic PDF file format)
• Geomorphic Assessment Memorandum (Draft and Final, electronic PDF file format)
TASK 3.4 ASSUMPTIONS
• The City will request right -of -entry from property owners to perform the required field work along the
tributary/stream.
• Two Otak personnel will conduct a one -day site assessment of the project area.
• Up to ten BFWs will be flagged for concurrence by the Agencies and Tribes during an on-site meeting.
• It is assumed that pebble counts will not apply due to the sand or silt dominated reaches, and streambed
materials will be documented visually and photographed.
• City will provide one list of consolidated comments on the draft Geomorphic Assessment memorandum that will
be addressed and incorporated into the final memorandum.
3.5 Cultural Resources (Subconsultant — Cultural Resource Consultants)
As a subconsultant to Otak, Cultural Resource Consultants (CRC), will prepare a Cultural Resources Assessment
with the following components:
• CRC will conduct a search of site files recorded at Washington Department of Archaeology and Historic
Preservation (DAHP); review of relevant correspondence between the project proponent, stakeholders and
DAHP; and, review of pertinent environmental, archaeological, ethnographic and historical information
appropriate to the project area from a variety of available resources.
• CRC will contact the cultural resources staff of tribes that may have an interest in the project area. This
communication is intended to inform the cultural resources assessment and does not constitute government -to -
government consultation.
• CRC will provide a field investigation of the project location for identification of archaeological and historical
resources and, if necessary, excavation of shovel test probes or other exploratory excavations in environments
that might contain buried archaeological deposits. Field methods will be consistent with DAHP guidelines.
• CRC will monitor during geotechnical explorations (two borings anticipated) in order to observe subsurface
conditions near the proposed culvert removal.
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• CRC will document and record archaeological and historic sites within the project area, including preparation of
Washington State archaeological and/or historic site(s) forms. Documentation will be consistent with DAHP
standards.
• CRC will prepare a technical memo describing background research, field methods, results of investigations,
and management recommendations. The report will provide supporting documentation of findings, including
maps and photographs, and will conform to DAHP reporting standards. Report and support materials will be
provided electronically.
TASK 3 DELIVERABLES
• Wetland and Stream Delineation and Habitat Assessment Report (Draft and Final, electronic PDF file format)
• Permitting and Environmental Review Memorandum (PERM) (Draft and Final, electronic PDF file format)
• Site meeting with WDFW, Tribes, City of Tukwila, and Otak for bankfull widths and coordination, and responses
to agency and tribal comments
• Memorandum documenting site meeting notes (electronic PDF file format)
• Impacts Assessment and Conceptual Mitigation Plan Memorandum (Draft and Final, electronic PDF file format)
• Cultural Resources Assessment Memorandum (Draft and Final, electronic PDF file format)
TASK 3 ASSUMPTIONS
• A final Critical Areas Report (CAR) per TMC 18.45.040 with baseline conditions, project impacts, and mitigation
plan will not be completed as a part of this scope since this would be completed closer to 60 percent design.
• The City will request right -of -entry from property owners to perform the required field work.
• Documentation for compliance with the Endangered Species Act is not included in this Scope of Services.
• A SEPA Checklist for SEPA compliance is not included in this Scope of Services.
• The JARPA form or figures preparation is not included in this Scope of Services.
• This task assumes one round of review comments by the City prior to Otak finalizing the delineation and habitat
assessment report, PERM, impacts and mitigation plan memorandum.
• The Impacts Assessment and Conceptual Mitigation Plan will be prepared for one design alternative, identified
as the preferred alternative.
• A mitigation plan for permit applications is not included in this Scope of Services.
4.0 Topographic Survey and Basemap
4.1 Topographic Surveying and Mapping
Otak will provide topographic surveying and mapping within the project area and adjacent areas to the extents as
shown on the figure in Attachment A. Within the Gilliam Creek channel area outside of the roadways, east of 66th
Ave S and north of Tukwila Parkway and south of 1-405, Otak will review and utilize recent WSDOT electronic
survey data and incorporate into the project basemap. We assume that the WSDOT data will be adequate for
topography within the channel area described above and will not require supplemental survey shots by Otak.
If the WSDOT files are not suitable for full topography within the Gilliam Creek channel area described above, the
City will be notified of additional work required for full development of survey and basemap preparation within this
area.
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Wetland and ordinary high water flags placed by Otak in Task 3 will be surveyed.
The topographic survey requirements include the following:
■ Vertical Datum: NAVD 88
■ Horizontal Datum: State Plane Coordinates (Washington North Zone, NAD 83/91 adjustment)
■ Contours at a maximum interval of 1'
■ TIN surface
■ Road centerline alignment
■ Surface features:
▪ Ditch centerline
▪ Top/Toe of slopes
▪ Channel thalweg
▪ Top of bank
Toe of bank
▪ Culvert invert elevations
▪ Catch basins with pipe inverts and diameters
▪ Location of all utilities and junction boxes in the project area
▪ Utility poles
▪ Edge of asphalt
▪ Edge of gravel
▪ Edge of concrete
▪ Road centerline
▪ Road striping
▪ Vegetation including trees, shrubs, and planters.
▪ Rockeries and retaining walls
▪ Fences
▪ Driveways
▪ Mailboxes
▪ Signs
Mapping shall be consistent with City of Tukwila Infrastructure Design and Construction standards.
4.2 Right-of-way Survey
Otak will prepare a right-of-way survey file based on property records review and field monuments. Property lines
for those properties within the vicinity of the project will be researched. The Record of Survey and a lot closure
report documenting all dimensions shown on the survey will be submitted to the City for review prior to recording.
The following Items are required on the Survey:
■ Found Monuments-Section/Plat/Road
■ Descriptions of monuments
■ Monuments looked for but not found
■ Section subdivision if applicable
■ Existing right-of-way centerline
■ Existing right-of-way lines
■ Outline and deed number for existing right-of-way deeds
■ Survey note stating the history that established the right-of-way
■ References
■ Road name
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• Road log number
• Right-of-way width
• Parcel lines of adjoining parcels (based on King County tax parcel lines unless otherwise noted)
• Name and auditor's file number of adjoining plats
• Parcel number of adjoining platted lots
TASK 4 DELIVERABLES
• Topographic Base Map (Scale 1" = 20 feet) with one -foot contour intervals (AutoCAD DWG file format)
• Existing Right-of-way CAD file (AutoCAD file format)
TASK 4 ASSUMPTIONS
• The extents of topographic survey and mapping for the stream and adjacent infrastructure are shown on
Attachment A. The extents include the shoulder area of 1-405 north of Gilliam Creek and west of 661h
Ave A. and the 66th Ave S. roadway as indicated. The extents also include the southeast corner of the
intersection of 66th Ave S. and Andover Park E and a portion of the parking lot on private property at 90
Andover Park E (Holiday Inn Express Hotel).
• The City will obtain right -of -entry for the parcels for the area of survey.
5.0 Hydrology and Hydraulics
5.1 Hydrologic Analyses
Otak will review the hydrology in the existing HSPF (Hydrologic Simulation Program Fortran) model provided by
the City for Gilliam Creek at the project site location. It is assumed that the existing model includes all inputs
needed for modeling the proposed stream system including precipitation, sub -catchment areas, and land use
associated with the existing conditions. Otak will import the HSPF model into the Western Washington Hydrologic
Model (WWHM2012) to produce a continuous time series of runoff data from the drainage basin. The continuous
time series of runoff and associated peak rates will become the hydrologic input for the hydraulic analyses to be
performed.
A climate resiliency calculation will be performed for the flow frequency results from the HSPF modeling effort in
order to determine possible future flows for the study site. The WDFW Designing Climate Change -Resilient
Culverts tool will be used to estimate the scaling factor to apply to the 100 -year return period flow.
5.2 Hydrologic Documentation
Otak will prepare documentation for the hydrologic analysis that will be included in the Hydrologic and Hydraulic
(H&H) memorandum. The final H&H memorandum shall be sealed by a Professional Engineer licensed in the
State of Washington. The hydrologic documentation will follow the following outline:
Y Annual peak flow analysis for return periods ranging from the 2 -year to the 500 -year.
Y Seasonal peak flow analysis for a two-month (July 1 to August 31), and a three-month (July 1 to
September 30) period for the purposes of determining construction bypass flows.
Y Flow duration curves at select locations.
Y Climate Resiliency calculation for the study site.
Y Electronic files for:
• Hydrologic models
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• GIS files
• Survey files
• Model schematics
5.3 Hydraulic Modeling
5.3.1 Alternatives Analysis Modeling
A previous hydraulic analysis was conducted by others to evaluate fish passage performance of Conceptual
Option 1 (Retrofit Flapgate in-place) The analysis was run utilizing the one-dimensional HEC -RAS hydraulic
model for a 13 -year period with observed river and simulated local inflow. A statistical analysis was performed
during critical fish passage durations to account for interaction of Gilliam Creek and the Green River.
Otak will review the existing one-dimensional HEC -RAS model for the existing and proposed conditions from
conceptual design, provided by the City. It is assumed that the statistical analysis to determine critical flow
conditions for fish passage assessment will not be available.
Otak will perform a statistical analysis of the time series data from the NHC hydraulic analysis to develop the joint
probability of flows in Gilliam Creek and stages on the Green River. This will provide a range of plausible flow
scenarios for the hydraulic analysis of Riverton Creek at the confluence.
Otak will develop a proposed conditions model for an additional two proposed conceptual alternatives for
comparison. The results of the models in regard to fish passage criteria will be presented in the Alternatives
Analysis Matrix under Task 6.
5.3.2 Preferred Alternative Modeling
Once the preferred alternative is selected and full site topographic survey has been completed for the upstream
reach and the confluence with the Green River under Task 4.2, an existing conditions model will be developed
using the Federal Highway Administration (FHWA) and U.S. Bureau of Reclamation's SRH -2D software (2020).
A proposed conditions model for the preferred alternative will also be developed in SRH -2D.
Steady-state inflow boundary conditions will be used based on HSPF modeled peak flows or flow duration curves,
and the models will be run over a long enough simulation time to establish steady-state hydraulic grade lines.
Due to the influence of tidal conditions, downstream boundary conditions including a high tide and a low tide
condition will be evaluated as a part of the hydraulic model. The evaluation will also include an estimated sea
level rise downstream condition to provide an evaluation of resiliency for climate change.
The evaluation of the hydraulic conditions from existing to proposed conditions will include the change in water
surface elevations, depths, velocities, shear stresses, potential upstream and downstream impacts from
improving conveyance. The proposed water surface elevations will be used to establish the minimum height for
the culvert replacement based on freeboard and debris clearance. The velocity results will be used to inform the
design about potential fish -passage conditions, stream channel stability, and wood structure placement for the
stream improvements.
A stable channel analysis will be performed following accepted methods in WDFW Water Crossing Design
guidelines and habitat restoration guidelines. Using results from the hydraulic analysis, Otak will perform
calculations to understand the vertical and lateral stability of the existing channel and how the stability might be
affected by the proposed design. Incipient motion calculations will be performed to identify the range of flows over
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which the bed material will be mobile. The reach -average stream power from the existing and proposed
conditions hydraulic model results will be compared to understand potential areas of erosion or sediment
deposition in the stream channel post -project.
The results of the analysis will be used to evaluate the width of the crossing structure following guidance in the
WDFW WCDG's for fish -passable structures and Appendix D for Tidally Influenced Crossings.
The WSDOT Log Metrics Calculator spreadsheet will be used to compare the proposed wood design to target
wood volumes. Wood stability calculations will be performed using the USFS Computational Design Tool for
Evaluating the Stability of Large Wood Structures, version 1.2. The preliminary wood stability calculations will be
submitted with the 30% PS&E.
Scour calculations will be performed at the culvert crossing for the design event (100 -year flow), and check event
(500 -year flow), in accordance with the FHWA Hydraulic Engineering Circular (HEC) 18, Evaluating Scour at
Bridges.
5.4 Hydraulic Documentation
Otak will prepare hydraulic documentation that summarizes the findings and conclusions from the hydraulic
analysis completed in Task 5.3. The hydraulic documentation will be included in the H&H memorandum described
in Task 5.2. The memorandum will summarize the following topics:
Y Hydrologic flow rates used in the hydraulic analyses
Y Hydraulic conditions including water surface elevations, depths, and flow velocities under existing and
proposed conditions
Y Tidal conditions and boundary conditions from the influence of the tide gate system, and river
Y Estimated sea level rise effects at the crossing structure
Y Potential impacts to upstream and downstream properties, including changes to flows, velocities, and
water surface elevations
Y Channel stability calculations
Y Potential areas of channel erosion, sediment deposition
Y Calculated scour depths at the culvert crossing (100 -year, and 500 -year event)
A draft and final H&H memorandum will be submitted to the City. The final H&H memorandum shall be sealed by
a Professional Engineer licensed in the State of Washington. The final H&H memorandum will be included with
the Project Design Report.
TASK 5 DELIVERABLES
Y Hydrologic and Hydraulic Memorandum (Draft and Final, electronic PDF file format)
Y Hydrologic Model electronic files (WWHM or similar HSPF format), supporting GIS data files
Y Hydraulic Model files (SRH -2D electronic file format)
TASK 5 ASSUMPTIONS
Y An F -Table will be developed at the drainage subbasin scale for routing flows within the stream channel.
It is assumed that no other F -Tables will be required or developed for routing flows through detention
structures upstream of the site.
Y SRH -2D software will be used for development of the 30% hydraulic model.
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Y The model domain will extend approximately 680' upstream from existing culvert inlet and 50'
downstream of existing culvert outlet based on topographic survey data.
Y Velocities and stream power will be used to perform a qualitative assessment of potential erosion and
deposition under proposed conditions, and no quantitative sediment transport calculations will be
performed.
6.0 Alternatives Analysis
6.1 Alternatives Development and Comparison
Engineering estimates of anticipated construction costs will be prepared at the conceptual alternatives level.
Estimates will be prepared using historical unit prices from similar projects, other current cost data, and recent
City projects.
Otak will develop up to three alternative concepts for the culvert replacement. Information collected from the
desktop review and field assessment for targeted fish species, fish access, and potential habitat gain will be used
to develop the potential alternatives for the stream crossings and habitat improvements. The proposed
alternatives will follow guidelines from the WDFW Water Crossing Design Guidelines for fish -passage structures
and Appendix D for Tidally Influenced Crossings where appropriate. The alternative concepts will include:
• Description of each alternative
• An Alternative matrix with evaluation criteria
• A preliminary exhibit for each alternative, showing the stream horizontal alignment and vertical profile
• Planning level cost estimate
The evaluation criteria for the Alternative matrix will include fish passage and habitat, flood protection, structure
type and size, potential utility relocation, construction considerations such as sequencing and temporary road
bypass, opportunity for park and educational features, environmental impacts and permitting, and cost. A
recommendation will be provided for the preferred alternative.
A site visit during this task is estimated to verify field conditions related to the proposed solution elements. The
site visit will be attended by up to five Otak staff.
The hydraulic modeling to assess the effects of the solutions will be performed under Task 5.3.1.
Otak will submit the comparison matrix and conceptual drawings to the City for review and will then hold a
meeting at the City to review. Otak will provide a recommended alternative and through discussions with the City,
a preferred alternative will be selected. The preferred alternative will be advanced to 30% Design after approval
of a future Scope Amendment for final design.
6.2 Alternatives Cost Estimation
Engineering estimates of anticipated construction costs will be prepared for each of the conceptual alternatives to
a planning level. Estimates will be prepared using historical unit prices from similar projects, other current cost
data, and recent City projects.
TASK 6.0 DELIVERABLES
• Conceptual plans and details for up to three alternatives (pdf)
• Alternatives Comparison Matrix (pdf)
• Planning Level Cost Est for each Alternative (pdf)
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TASK 6.0 ASSUMPTIONS
• Alternatives are required to be in compliance with the 2021 King County Surface Water Design Manual as
adopted by the City of Tukwila.
• Alternatives are required to be in compliance with the City of Tukwila Infrastructure Design and Construction
Standards.
• The three alternatives will be similar to preliminary work by others:
o Option 1 Culvert only (structures: head wall, wing wall, assess impact to existing roadway wall)
o Option 2 Road Culvert & Trail Bridge (structures: culvert head wall, culvert wing wall, assess
impact to existing roadway wall, trail bridge Type Size & Location, TS&L)
o Option 3 Road Bridge & Trail Bridge (structures: assess impact to existing roadway wall, road
bridge TS&L). Assumes Trail Bridge TS&L from Option 2 mostly, if not completely, applicable.
• If the Alternatives vary significantly from the conceptual options, by others, such as moving the levee back, a
request will be made for authorization of management reserve funds to increase the Alternatives Analysis
scope.
7.0 Geotechnical Services (Landau Associates, Inc.)
7.1 Phase 1 Geotechnical Investigation
The geotechnical subconsultant Scope of Services is included in Attachment B.
8.0 Utility Coordination
8.1 Franchise Utility Coordination
Otak will request as -built drawings and use data collected from the utility locates and topographic survey to verify
the location of existing facilities. Otak will prepare a spreadsheet/matrix summarizing utility conflict locations and
actions to be taken. Permit requirements for each location will be included in the matrix. This document will be
updated whenever new information becomes available to assure that all utility coordination activities are tracked.
Otak will also prepare a Comprehensive Utility Coordination Plan to show all existing and proposed utilities within
the Corridor.
Otak will begin communications with franchise utility companies (power, gas, telecommunications, water and
sewer, etc.) following the selection of a preferred concept alternative by the City, to verify locations of existing
facilities and to discuss any potential relocation requirements, cost, schedule and recommendations on location of
new facilities. It is anticipated that up to three (3) utility coordination meetings will occur with franchise or City
utilities that are determined to have conflicts or require relocation.
TASK 8.1 DELIVERABLES
• Utility Coordination Plan
• Utility Coordination Tracking Matrix
TASK 8.1 ASSUMPTIONS
• Design of relocated utilities will be at franchise utility's expense and is not included in this scope.
• Potholing of utilities to verify the underground location is not included in this scope but is recommended to be
performed after 30% design.
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9.0 Stakeholder Engagement
9.1 Stakeholder Engagement Plan
Otak will develop a draft strategy at the outset of the project that includes the purpose and objectives to be
achieved by the engagement, the entities to be engaged and informed during the project, activities and a timeline
for engagement that aligns with the project schedule and key milestones, and specific responsibilities for
engagement. The engagement plan will follow the "Informed Consent" model for community engagement. The
community and stakeholder engagement lead and project manager will meet with City of Tukwila staff to review
and discuss the strategy. After beginning the alternatives analysis under Task 6.0 and identifying the potential
extent of improvements, Otak will then finalize the strategy based on input from City staff.
This scope assumes a total of two (2) one and a half-hour online meetings between the City and Otak attended by
two (2) Otak staff. The purpose of these meetings will be to discuss Otak's initial recommendations and key
stakeholder issues that will guide the design.
9.2 Agency and Stakeholder Coordination
At the City's request, Otak will support the City in coordination with agencies, tribal representatives, and
stakeholders to address project designs and respond to comments. Otak will review and provide available
information from previous data collected at the site to as requested.
As part of this task, Otak will participate in an on-site meeting with representatives from the City of Tukwila,
WDFW, Tribal representatives, and Otak to review the project goals, components, and habitat restoration
benefits, and perform bankfull width measurements.
Otak will coordinate with the City, WDFW and the Tribes to identify any potential reference reaches or appropriate
bankfull width measurement locations. Otak will prepare memoranda to document site meeting notes.
Otak will prepare email correspondence and memoranda to respond to comments received from the Tribes and
agencies. As the level of effort for comment responses and coordination cannot be quantified at this time, a total
level of effort of 40 hours of staff time is assumed for this scope task.
Otak will attend up to four meetings with the WSDOT Design team working on Gilliam Creek Crossing
Improvements upstream.
TASK 9.0 DELIVERABLES
• Draft Stakeholder Engagement Plan (pdf)
• Final Stakeholder Engagement Plan (pdf)
TASK 9.0 ASSUMPTIONS
• The City will provide title reports and property owner information for key properties identified through the
alternatives analysis.
• The City will provide any available information from past discussions with property owners in the project area
regarding the flooding issues.
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Management Reserve
If directed by the City, consultant will provide services needed to assist the City for unforeseen tasks related to
this project that were not specifically addressed in this scope of work. When requested by the City, the consultant
will provide a scope and budget for the task identified by the City. The consultant will not proceed with the task
until written authorization has been provided by the City. The allotted amount for this task is $15,000.
Direct Expenses
Direct expenses to be submitted for reimbursement include:
• Mileage/Travel for site investigations and meetings
• Postage and Courier
• Private Utility Locate Service for Survey
• Traffic Control Plan and Flagging for Survey
• Lodging and Meals for Survey Crew
• Other Misc. Expenses
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Attachment A — Survey Extents
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186
L4LANDAU
ASSOCIATES
May 4, 2022
Otak, Inc.
2828 Colby Ave., Ste 401
Everett, WA 98201
Attn: Mr. Tyson Hounsel, PE, Project Manager and Puget Sound Water Resources Manager
Transmitted via email to: tyson.hounsel@otak.com
Re: Proposal for Preliminary Geotechnical Engineering Services
Gilliam Creek Fish Passage Improvements
Tukwila, Washington
Dear Mr. Hounsel:
Landau Associates, Inc. (Landau) is pleased to submit this proposal for preliminary geotechnical
engineering services in support of the Gilliam Creek Fish Passage Improvements project in Tukwila,
Washington.
This proposal has been prepared with information provided by Otak, Inc. (project civil engineer).
Project Understanding
The City of Tukwila (City, project owner) proposes to improve fish passage along the lower reach of
Gilliam Creek, where the creek runs parallel to Interstate 405 (site). At the site, the creek flows
through a 108 -inch -diameter culvert beneath 66th Avenue South and the Green River Trail before
converging with the Green River. Immediately upstream of this confluence, the culvert is fitted with a
top -hinge flap gate with wing walls and a concrete splash pad. These features have been identified as
barriers to fish passage. The design team has been asked to evaluate the following options for
improving fish passage:
• Option 1. Retrofit the flap gate and replace the splash pad with a roughened channel. The
culvert beneath 66th Avenue South and the Green River Trail would remain in place.
• Option 2. Daylight Gilliam Creek beneath the Green River Trail. The culvert beneath 66th
Avenue South would be shortened; a bridge would be added; and the flap gate would be
replaced.
• Option 3. Abandon the existing Gilliam Creek culvert and replace with a daylighted reach
beneath 66th Avenue South. The downstream portion of the creek would be moved to an
expanded habitat and refuge area on the west bank of the Green River.
Proposed Scope of Services
Landau proposes to assess subsurface soil and groundwater conditions at the site. Findings will be
used to select a preferred design option. Landau's proposed scope of services includes the following
tasks.
155 NE 100th St, Ste 302 • Seattle, WA 98125 • 206.631.8680 • www.landauinc.com
187
Gilliam Creek Fish Passage Improvements Landau Associates
Phase 1. Geotechnical Desktop Study
Landau will review existing geologic and geotechnical information for the site and the surrounding
area. Possible resources include data collected during previous subsurface investigations by others,
geologic and topographic maps, and as -built drawings of area structures and roadways. Phase 1
findings will be summarized in an email.
Phase 2. Preliminary Geotechnical Engineering Services
Following completion of Phase 1, geotechnical findings will be reviewed at a charter meeting, and the
options for fish passage improvement will be updated.
During Phase 2, Landau will complete a geotechnical field investigation, laboratory testing, and
preliminary engineering analyses. Findings will be used by Otak to develop rough order of magnitude
cost estimates for the design options.
Field Investigation A ctivities
Prior to beginning the field investigation, Landau will prepare a geotechnical exploration plan for
Otak's review and approval. Landau will mark exploration locations in the field and contact the
Washington Utilities Coordinating Council's "One Call" locating service.
Explorations will be located in the shoulder or within a travel lane of 66th Avenue South. As such,
temporary lane closures will be required during fieldwork. Landau will prepare a traffic control plan
and obtain a right-of-way use permit from the City. Landau will also subcontract traffic control
services, including flaggers and warning signs.
Initially, the hollow -stem auger drilling method will be used to advance two borings. When the
borings encounter the groundwater table, drilling will be paused for up to 30 minutes to allow
groundwater to equalize. The borings will then be advanced using the mud rotary drilling method.
One boring will be advanced to a maximum depth of 80 feet (ft) below ground surface (bgs), and the
other boring will be advanced to a maximum depth of 120 ft bgs. If bedrock is encountered, a core
barrel will be used to extend the borings by as much as 10 ft, or to the maximum depths noted above.
Landau also will advance as many as six hand auger borings upstream of the culvert.
Landau personnel will monitor the borings, collect representative soil samples, and maintain detailed
logs of the subsurface soil and groundwater conditions observed. The standard penetration test (SPT)
procedure will be used to obtain soil samples at 21/2- or 5 -ft intervals. SPT samples will not be obtained
from the interval at which coring is used to penetrate bedrock.
Excess soil cuttings will be disposed of off site. Upon completion of drilling and sampling, the
explorations will be decommissioned in accordance with the requirements in Washington
May 4, 2022 2
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Gilliam Creek Fish Passage Improvements Landau Associates
Administrative Code Chapter 173-160. The pavement at each exploration location will be patched
with fast -setting concrete.
Geotechnical Laboratory Testing
Soil samples obtained from the borings will be transported to Landau's geotechnical laboratory for
further examination and testing. Landau anticipates that its laboratory testing program will include 12
index tests (grain size analyses or Atterberg limits determinations) and 6 moisture content
determinations. Soil samples will be retained for 30 days following submittal of the final geotechnical
engineering report. Samples will then be disposed of, unless other arrangements are made.
Preliminary Geotechnical Engineering and Reporting
The results of Landau's field investigation, laboratory testing, and engineering analyses will be
summarized in a preliminary geotechnical report. The report will also include:
• a site plan showing the locations of the field explorations.
• summary boring logs and the results of laboratory testing.
• a general description of site geology.
• a discussion of near -surface soil and groundwater conditions observed at the site.
• recommended seismic design parameters that accord with the American Association of State
Highway and Transportation Officials' 2020 LRFD (Load and Resistance Factor Design) Bridge
Design Specifications.
• a soil liquefaction assessment, including estimates of liquefaction -induced settlement at
ground surface.
• preliminary recommendations for foundation support of the replacement culvert, including
bearing resistances at the service, strength, and extreme limit states; axial and uplift
capacities for deep foundations; estimated downdrag loads on deep foundation elements; and
recommended L -pile input parameters, as applicable.
• recommendations regarding static and dynamic lateral earth pressures on buried walls,
including estimated lateral spreading loads on culvert wing walls, if applicable.
• recommendations for final design services.
Landau will prepare a draft report for the design team's review and comment. Upon receipt,
comments will be addressed, and Landau will issue a final report, signed and sealed by the project
engineer.
Assumptions
Landau made the following assumptions when preparing this scope of services and cost estimate:
• Otak will provide Landau with a project base map in AutoCAD° format.
• Temporary lane closures will be required during fieldwork.
May 4, 2022 3
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Gilliam Creek Fish Passage Improvements Landau Associates
• The City will issue a right-of-way use permit at no cost to Landau.
• The asphalt concrete pavement at the proposed exploration locations is not underlain by
Portland cement concrete (i.e., no concrete coring will be required).
• The City will allow Landau to patch pavement at the boring locations with fast -setting
concrete.
• Soil cuttings will be drummed and disposed of off site.
• If required, permits pertaining to explorations in wetland areas or within stream buffers will
be obtained by others at no cost to Landau.
• All public and private utilities at the proposed exploration locations can be identified via a
One -Call locate request. No vacuum excavation will be required.
• Landau will not be responsible for damage to unmarked (or mismarked) utilities.
• If required, right -of -entry permits will be obtained by others.
• The hand auger borings can be completed in 10 hours, including travel time.
• The field investigation can be completed during standard business hours (i.e., no weekend,
holiday, or nighttime drilling will be required).
• If necessary, Landau will evaluate as many as two deep foundation alternatives.
• Additional geotechnical engineering services will be required to support final design of the
proposed improvements.
• Information regarding the infiltration characteristics of site soil is not needed, and infiltration
testing and analyses are not included in this scope of services.
• Chemical analysis will not be performed on soil samples collected from the explorations.
Cost Estimate
Services will be provided on a time -and -materials basis in accordance with the rates presented in
Landau's 2022 Compensation Schedule (attached). Landau proposes to provide its services for a fee of
$48,680, as detailed in Table 1 (attached). Landau will not exceed its budget without Otak's written
authorization.
Authorization
To authorize Landau's services, please develop a subconsultant agreement, consistent with previous
agreements between Otak and Landau.
May 4, 2022 4
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Gilliam Creek Fish Passage Improvements Landau Associates
Closing
We appreciate the opportunity to submit this proposal and anticipate its favorable review. If you have
questions or comments, please contact Sean Gertz at 206.631.8680 or at sgertz@landauinc.com.
LANDAU ASSOCIATES, INC.
Sean Gertz, PE
Senior Engineer
Steven R. Wright, PE
Principal
SMG/SRW/mcs
2022-0194
[\\EDMDATA02\PROPOSALS\C_TUKWILA\2022-02_GILLIAM CREEK FISH PASSAGE\PROPOSAL\GILLIAM CREEK FISH PASSAGE IMPROVEMENTS PROPOSAL FOR GEOTECHNICAL SERVICES
5.4.2022. DOCX]
Attachments: 2022 Compensation Schedule
Table 1. Budget Breakdown
May 4, 2022 5
191
192
COMPENSATION SCHEDULE - 2022
LANDAU
ASSOCIATES
Personnel Labor Hourly Rate
Senior Principal 305
Principal 285
Senior Associate 265
Associate 240
Senior 215
Senior Project 195
Project 175
GIS Analyst / CAD Designer 175
Senior Staff 160
Staff / Senior Technician II 145
Data Specialist 145
CAD / GIS Technician 135
Project Coordinator 125
Assistant / Senior Technician I 115
Technician 100
Support Staff 85
Expert professional testimony or the preparation thereof for court, deposition, declaration, arbitration, or public
testimony is charged at 1.5 times the hourly rate.
Rates apply to all labor, including overtime.
Equipment
Field, laboratory, and office equipment used in the direct performance of authorized work is charged at unit rates.
A rate schedule will be provided on request.
Subcontractor Services and Other Expenses
Subcontractor billing and other project expenses incurred in the direct performance of authorized routine services
will normally be charged at a rate of cost plus a twelve percent (12%) handling charge. A higher handling charge for
technical subconsultants and for high-risk field operations may be negotiated on an individual project basis;
similarly, a lower handling charge may be negotiated on projects requiring disproportionally high subconsultant
involvement.
Invoices
Invoices for Landau Associates' services will be issued monthly. Interest of 11/2 percent per month (but not
exceeding the maximum rate allowable by law) will be payable on any amounts not paid within 30 days.
Term
Unless otherwise agreed, Landau Associates reserves the right to make reasonable adjustments to our compensation
rates over time (e.g., long-term continuing projects).
T: Templates\Contracts\2022 Compensation Schedule
Landau Associates
193
194
Table 1.
Budget Breakdown
Gilliam Creek Fish Passage Improvements
Tukwila, Washington
Page 1 of 1
5/3/2022 \\edmdata02\ Proposals \C_Tukwila\2022-02_Gilliam Creek Fish Passage\Proposal\Exhibit B V2
Landau Associates
Scope Items
Principal
Senior
Staff
CAD
Project
Coordinator
Totals
Total
Labor Costs
LABOR COSTS
Preliminary Geotechnical Engineering Services
Desktop Study
1
4
4
9
$1,725
Project Management
14
10
24
$4,260
Utility Locates, Proposed Exploration Plan, Field Coordination
1
2
14
17
$2,745
Right of Way Permit Coordination
2
8
10
$1,590
Field Investigation
2
20
22
$3,330
Preliminary Geotechnical Engineering Services
5
12
24
41
$7,485
Draft Report
6
16
24
2
4
52
$9,400
Final Report
2
4
6
1
2
15
$2,685
Task Total
15
56
100
3
16
190
$33,220
Rate by Position
$285.00
$215.00
$145.00
$135.00
$125.00
Total — Labor Cost
$4,275
$12,040
$14,500
$405
$2,000
$33,220
DIRECT COSTS
Holocene Drilling
$12,524
Traffic Control Subcontractor
$1,700
Laboratory Testing
$1,170
Field Equipment/Mileage
$67
Total — Direct Costs
$15,460
Total
$48,680
5/3/2022 \\edmdata02\ Proposals \C_Tukwila\2022-02_Gilliam Creek Fish Passage\Proposal\Exhibit B V2
Landau Associates
CO
6)
CD
1
City of Tukwila - Gilliam Creek Fish Barrier Removal and Habitat Enhancement
Fee Estimate
Otak Project # 20610.000
5/24/2022
of budget in Current Year (CY)
of budget in CY+1
of budget in CY+2
of budget in CY+3
Weighted Escalation Factor
Annual Escalation Rate
WATER & NATURAL RESOURCES ENGINEERING
TRANSPORTATION AND PLANNING AND LANDSCAPE
ENVIRONMENTAL SCIENCES STRUCTURAL INFRASTRUCTURE ARCH.
SURVEY
ADMIN
90.00%
10.00
1.005
4.50
Otak
Task
Description
Sr. PIC/Sr.
PM Civil
Civil
Engineer
IX
Civil
Engineer
VIII
Civil
Engineer
X
Civil
Engineer
IV
Engineerin
g Designer
IV
Scientist
VI-
Hydrologi
st
Scientist V
Scientist V
Scientist II
Civil
Engineer X
Civil
Engineer V
Civil
Engineer
X
Engineeri
ng Tech
IV
Civil
Engineer
VII
Landsca
pe
Architect
VI
Landsca
pe
Architect
III
Planner
IV
PPIC/PLS
Sr.
Manager
Profession
al Land
Surveyor V
Survey
Crew
Chief II
Survey
Crew
Chief I
Survey
Field
Tech III
Survey
Office
Tech III
Project
Coord I
Project
Admin.
Asst
Otak
Total
Hours
Otak Budget
by Task
Sub -
Landau
Associates,
Inc.
Sub - CRC
Total Budget
By Task
1
Project Management and Coordination
$20,438.00
1.1
Coordination with City
18
12
30
$5,160.00
1.2
Preparation of Work Plan
8
16
4
28
$4,131.00
1.3
Meetings
2
8
4
14
$2,703.00
1.4
Project Monitoring and Reporting
24
18
12
54
$8,444.00
2
Intake Review
$14,717.00
2.1
Data Review and Desktop Assessment
2
8
8
24
6
6
6
60
$9,308.00
2.2
Initial Site Visit
8
8
8
8
32
$5,409.00
3
Environmental/Permitting Support
$43,563.00
3.1
Wetland and Stream Delineation and Habitat
Assessment Report
1
32
64
97
$12,221.00
3.2
Permitting and Environmental Review Memorandum
2
16
8
26
$3,878.00
3.3
Impacts Assessment for Mitigation Planning
1
8
16
8
33
$4,700.00
3.4
Geomorphic Assessment
1
2
16
80
6
105
$16,764.00
3.5
Cultural Resources (Sub -Cultural Resource
Consultants)
$6,000.00
4
Topographic Survey and Basemap
$36,132.00
4.1
Topographic Surveying and Mapping
4
16
84
10
84
64
262
$27,715.00
4.2
Right-of-way Survey
1
1
40
42
$8,417.00
5
Hydrology and Hydraulics
$48,306.00
5.1
Hydrologic Analyses
1
2
1
12
16
32
$5,644.00
5.2
Hydrologic Documentation
1
1
4
16
24
10
2
58
$8,606.00
5.3
Hydraulic Modeling
4
24
8
100
40
176
$25,045.00
5.4
Hydraulic Documentation
1
16
44
2
63
$9,011.00
6
Alternatives Analysis
$71,853.00
6.1
Alternatives Development and Comparison
4
20
20
2
50
24
4
4
8
42
100
16
20
24
14
24
376
$59,638.00
6.2
Alternatives Cost Estimation
6
4
14
12
4
12
4
10
4
10
80
$12,215.00
Geotechnical Services (Sub -Landau Associates,
Inc.)
$48,680.00
7.1
Phase 1 Geotechnical Investigation
$48,680.00
8
Utility Coordination
$7,237.00
8.1
Franchise Utility Coordination
2
8
32
16
58
$7,237.00
9
Stakeholder Engagement
$14,996.00
9.1
Stakeholder Engagement Plan
6
4
6
28
44
$7,068.00
9.2
Agency and Stakeholder Coordination
18
8
4
16
46
$7,928.00
Total Hours
7
124
80
19
343
156
30
102
114
86
54
112
20
36
34
18
34
28
1
56
84
10
84
64
16
4
1,716
Current Billing Rate
$291.00
$198.00
$177.00
$214.00
$131.00
$127.00
$205.00
$164.00
$164.00
$105.00
$214.00
$143.00
$214.00
$106.00
$160.00
$162.00
$123.00
$155.00
$248.00
$200.00
$105.00
$95.00
$84.00
$110.00
$108.00
$88.00
Annualized Billing Rate
$292.31
$198.89
$177.80
$214.96
$131.59
$127.57
$205.92
$164.74
$164.74
$105.47
$214.96
$143.64
$214.96
$106.48
$160.72
$162.73
$123.55
$155.70
$249.12
$200.90
$105.47
$95.43
$84.38
$110.50
$108.49
$88.40
Total Labor Cost
$2,046.17
$24,662.48
$14,223.72
$4,084.30
$45,135.20
$19,901.15
$6,177.68
$16,803.28
$18,780.13
$9,070.64
$11,608.00
$16,088.07
$4,299.26
$3,833.17
$5,464.48
$2,929.12
$4,200.82
$4,359.53
$249.12
$11,250.40
$8,859.69
$954.28
$7,087.75
$7,071.68
$1,735.78
$353.58
$251,242.00
$9,700.00
$48,680.00
$6,000.00
$305,922.00
$15,000.00
$9,700.00
Management Reserve
Direct Expenses
Project Total
$330,622.00
Page 1 of 1
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198
Transportation & Infrastructure Services Committee Minutes June 6, 2022
Committee Recommendation
Unanimous approval. Forward to the June 13, 222 Special Consent Agenda.
E. Resolution: Six -Year Transportation Improvement Program
Staff is seeking Council approval of the resolution adopting the annual update of the Six -Year
Transportation Improvement Program for 2023-2028.
Committee Recommendation
Unanimous approval. Forward to June 13, 2022 Committee of the Whole for Public Hearing.
F. Ordinance: NPDES Phase II Municipal Stormwater Permit
Staff is seeking Council approval of an ordinance to adopt the 2021 King County Surface Water
Design Manual and the 2021 King County Stormwater Pollution Prevention Manual.
Committee Recommendation
Unanimous approval. Forward to June 13, 2022 Committee of the Whole
G. Contract: Gilliam Creek Fish Barrier Removal and Habitat Consultant
Staff is seeking Council approval of a contract with Otak in an amount not to exceed $330,622
*for engineering and design of the Gilliam Creek Fish Barrier Removal and Habitat
Enhancement.
Committee Recommendation
Majority approval. Forward to June 13, 2022 Special Consent Agenda.
Miscellaneous
Meeting Packets - Committee members discussed meeting packets. Staff will ensure quality
control of future hard copy packets to ensure all pages are complete.
Meeting Conduct - Committee members discussed meeting productivity. Chair Kruller
requested that questions and comments be germane to the staff request in accordance with
parliamentary procedure.
Item(s) for follow-up:
• Staff will return with an educational item on how large capital projects are sequenced,
including coordination with utility providers.
The meeting adjourned at 6:23 p.m.
Committee Chair Approval
Minutes by LH
199