HomeMy WebLinkAboutReg 2024-12-02 Item 5G - Contract Amendment #2 - Gilliam Creek Fish Barrier Removal & Habitat Enhancement Design with Otak Inc for $769,952COUNCIL AGENDA SYNOPSIS
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12/02/24
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ITEM INFORMATION
ITEM No.
5.G.
STAFF SPONSOR: JOSH HOPKINS
ORIGINAL AGENDA DATE: 12/02/24
AGENDA ITEM TITLE Gilliam Creek Fish Barrier Removal and Habitat Enhancement
Amendment No. 2 Additional Design and Engineering Services
CATEGORY ❑ Discussion
Mtg Date
Motion
Date 12/02/24
❑ Resolution
Mtg Date
❑ Ordinance
Mtg Date
❑ Bid Award
Mtg Date
❑ Public Hearing
Mtg Date
❑ Other
Mtg Date
Mtg
SPONSOR ❑Council ❑Mayor HR DCD ❑Finance Fire ❑TS P&R Police BPIF ❑Court
SPONSOR'S The Gilliam Creek Fish Barrier Removal and Habitat Enhancement project was established
SUMMARY as a City CIP project in 2019.This contract amendment includes additional tasks to
complete Preliminary Design Alternatives Analysis and 30% Design for the preferred
alternative by the end of Q2 2025.Council is being asked to approve Amendment No. 2 to
Contract 24-093 with Otak for additional design and engineering services in the amount of
$769,952.00.
REVIEWED BY
A Trans&Infrastructure
❑ CommunitySvs/Safety ❑ Finance Comm. ❑ Planning/Economic Dev.
❑ Arts Comm. ❑ Parks Comm. ❑ Planning Comm.
11/25/24 COMMITTEE CHAIR: ARMEN PAPYAN
❑ LTAC
DATE:
RECOMMENDATIONS:
SPONsoR/ADMIN.
COMMITTEE
Public Works Department
Unanimous Approval; Forward to the Regular Consent Agenda
COST IMPACT / FUND SOURCE
EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED
$769,952.00 $1,628,000.00 $0.00
Fund Source:
Comments:
MTG. DATE
RECORD OF COUNCIL ACTION
12/02/24
MTG. DATE
ATTACHMENTS
12/02/24
Informational Memorandum dated 11/22/24
Pace Scope and LOE
CIP 2023-2028 Pg 81
Minutes from Transportation and Infrastructure Committee meeting of 11/25/24
(distributed separately)
93
94
TO:
FROM:
BY:
CC:
DATE:
SUBJECT:
City of Tukwila
Thomas McLeod, Mayor
Public Works Department - Pete Mayer, Interim Director
INFORMATIONAL MEMORANDUM
Transportation and Infrastructure Services Committee
Pete Mayer, Public Works Director
Joshua Hopkins, Surface Water Project Manager
Mayor Thomas McLeod
November 22, 2024
Gilliam Creek Fish Barrier Removal and Habitat Enhancement
Project No. 99830105, Contract No. 24-093
Amendment No. 2 Additional Design and Engineering Services
ISSUE
Approve amendment No. 2 to Contract No. 24-093 with Otak, Inc. for additional design and engineering
services in the amount of $769,952.00.
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 goals of the project are to restore fish passage between Gilliam Creek and
the Green River, enhance habitat, and maintain or improve flood protection and maintenance and
operation of the flap gate system.
ANALYSIS
This contract amendment includes additional tasks to complete Preliminary Design Alternatives
Analysis and 30% Design for the preferred alternative by the end of Q2 2025. In October of 2024,
Tukwila applied for DOT Culvert AOP grant to fund 30% Design through Construction. If Tukwila were
to be successful with this grant, reimbursement would start at 30% Design, so the project needs to
progress to the 30% Design milestone in order to receive reimbursements from the DOT Grant. If the
grant application were to be unsuccessful, Tukwila will re -apply in Q3/'25 and will submit a more
competitive grant application with a preferred alternative developed to 30% Design and cost estimate.
FISCAL IMPACT
Otak has provided a cost estimate not to exceed $769,952.00 to perform additional design and
engineering services. Total grant funding for this project is $1,350,000.00; a cost increase for
$278,000.00 has been submitted to WRIA 9 to cover the delta.
Consultant
Budget
Otak Contract 22-068, 23-191, 24-093
$719,593.42*
24-093 Amendment No. 1
$138,270.00
24-093 Amendment No. 2
$769,952.00
Grants (Secured)
$1,350,000.00
Grants (Cost Increase Submitted)
$278,000.00
Totals:
$1,627,815.42
$1,628,000.00
* = The original contract amount for the three contracts was $733,556.42, the actual payment was $719,593.42, a difference of $13,963.
RECOMMENDATION
Council is being asked to approve Amendment No. 2 to Contract 24-093 with Otak for additional design
and engineering services in the amount of $769,952.00 and to consider this item on the Consent Agenda
at the December 2, 2024, Regular Council Meeting.
Attachments: CIP '23-'28 Pg 81, Otak Scope and LOE
W:\PW Eng\PROJECTS\A- DR Projects\Gilliam Creek Fish Barrier Removal (99830105)\02 - Funding and Finance\Consultant Selection\(005)
- Consultant & Support Contracts\24-093\Amend #2
95
96
EXHIBIT A-2
SCOPE OF WORK
DESIGN/ENGINEERING SERVICES
City of Tukwila
Gilliam Creek Fish Barrier Removal and Habitat Enhancement Project
OTAK Project No. 20610.003
November 2024
Amendment No. 2
Introduction and Background
The scope of work for the previous amendment provided services to refine alternatives and develop the preferred
alternative to concept design level and cost estimate. The scope of work for this Amendment No. 2 advances the
preferred alternative into preliminary design including background hydraulic assessment.
The Scope of Services for Amendment No. 2 is described in detail in the following sections.
SCOPE AND BUDGET MODIFICATIONS
1.0 Project Management and Coordination
1.1 Coordination with City
This task is expanded in level of effort to provide project management for the additional services included under
Amendment No. 2. 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 weekly basis, and status reports will be provided to
the City summarizing the status of action items and deliverables. This task will also include coordination with the
City about next phases of work including development of work descriptions and scopes of services. Next phases
of work to be discussed and defined with the City are anticipated to include:
1. Implementation Planning
2. Engagement with Stakeholders and Public Outreach
3. Final Design
4. Permitting for Construction
5. Construction Support
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1.4 Project Monitoring and Reporting
Project monitoring and reporting will include the coordination of design team members, project schedule updates,
and the preparation of a monthly progress report and a monthly billing statement.
TASK 1 DELIVERABLES
• Status reports submitted to the City by email (electronic PDF file format)
• Schedule updates submitted to the City by email (electronic PDF file format)
• Monthly progress report and monthly invoice (electronic PDF file format)
TASK 1 ASSUMPTIONS
• The duration for this phase of the project is assumed not to extend beyond July 30, 2025.
NEW SCOPE TASKS
4.0 Topographic Survey and Basemap
4.2 Supplemental Topographic Surveying and Mapping of Green River
Otak provided topographic survey of the project improvement area under previous tasks. After the initial survey,
the extents of potential improvements have expanded and the complexity of related hydraulic modeling has
increased. Under this task, Otak will provide supplemental topographic survey and will update the electronic
basemap to reflect the current conditions along the Green River and public trail and roadway area to the south of
the existing culvert. The extents of supplemental survey include: are shown in Attachment A -Survey Extents Map.
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
■ Surface features:
■ Top/Toe of slopes
■ Channel thalweg
■ Top of bank
■ Toe of bank
■ Culvert invert elevations
■ Vegetation including trees, shrubs, fallen trees in stream over 8-inches in diameter
■ Boulders or rocks in the stream greater than 12" across
■ Rock scour protection limits in place around culvert inlet
Mapping shall be consistent with City of Tukwila Infrastructure Design and Construction standards.
TASK 4.2 DELIVERABLES
■ Updated Topographic Base Map (Scale 1" = 20 feet) with one -foot contour intervals (AutoCAD DWG file
format)
TASK 4.2 ASSUMPTIONS
■ If required, the City will obtain right -of -entry for the parcels for the area of survey.
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• If a ROW Permit is required, Otak will coordinate with the City and will submit the ROW application. Traffic
Control is assumed to be limited and not requiring flagging.
5.0 Hydrology and Hydraulics
5.6 Gilliam Creek Flap Gate Replacement Flood Study - Proposed Conditions
Otak previously developed a preliminary existing conditions model under Task 5.5. Under Task 5.6, the
preliminary existing conditions model will be finalized and will be the basis for the creation of proposed conditions
models. The proposed conditions modeling will assess the effects of replacing the existing Gilliam Creek flapgate
with two different flood gate technologies including:
1. Self-regulating tide gate with muted tidal regulator
2. Motorized sluice gate
The study is intended to evaluate the hydraulic effects of these replacement gate options on the upstream
conveyance network and operation of the Strander pump station and P17 pump station flood protection facilities.
The study will consider options for flood gate open and close settings and will evaluate changes between the
existing conditions and proposed conditions models such as:
1. Water surface elevations in Gilliam Creek at the project site including duration analysis for key habitat
zones
2. Water surface elevations in the primary stormwater trunkline conveyance pipes that typically drain into
Gilliam Creek
3. Pump station run times during select storm event periods and releases from the Howard Hanson Dam
based on historical data
TASK 5.6 DELIVERABLES
• HSPF-SWMM Electronic Model
TASK 5.6 ASSUMPTIONS
• The model developed under this task is intended to evaluate changes in the water surface within Gilliam
Creek and the related changes to the City conveyance trunklines and pump station usage between
existing and proposed conditions.
5.7 Gilliam Creek Flap Gate Replacement Flood Study Report
Otak will prepare a report summarizing the hydrologic and hydraulic modeling methods used and the key factors
and criteria identified through the study that must be met to provide fish passage to the extent feasible while still
maintaining the flood protection. It is anticipated that the report will contain up to six GIS maps such as:
o Study Area Map
o Model Schematic layout
o Low -flow scenario drainage map
o High -flow scenario drainage map
o High -flow and low -flow inundation figures
Otak will conduct an intake meeting with Tukwila prior to City review of the draft report.
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TASK 5.7 DELIVERABLES
• Draft Flood Study Report
• Comment Responses
• Final Flood Study Report
TASK 5.7 ASSUMPTIONS
• Reports will be delivered in electronic .pdf format.
• City will provide one list of consolidated comments on the draft report. Comments will be addressed and
incorporated into the final report.
5.8 Open Channel Hydraulic Analysis for Proposed Improvement Area
5.8.1 Preliminary Hydraulic Analysis
5.8.1.A Preliminary Hydraulic Modeling
Otak will complete hydraulic analyses of the existing and proposed conditions to evaluate the hydraulic conditions
as a result of the project.
The existing conditions and proposed conditions will be modeled using either the Federal Highway Administration
(FHWA) and U.S. Bureau of Reclamation's SRH-2D software (2020), or the U.S. Army Corps of Engineers
HEC-RAS 2-D (2019) software to evaluate hydraulic conditions for the preliminary design.
It is assumed that the model domain will include the following:
• 700-foot segment of Gilliam Creek extending upstream from the confluence with the Green River
• 1,200-foot segment of the Green River extending upstream from the south side of the 1-405 bridge.
The model 2D mesh will be constructed from the topographic survey basemap prepared by Otak including
supplemental survey obtained along the Green River under Task 4.2.
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.
The evaluation of the hydraulic conditions from existing to proposed conditions will include the change in water
surface elevations, depths, velocities, and shear stresses. The proposed water surface elevations will be used to
establish the minimum height for the culvert replacement based on freeboard and debris clearance under flood
gate open conditions. 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.
Preliminary scour calculations will also be performed at the crossing structure and along the modified river
embankment and scour counter measures will be included in the design, if warranted. The results of the analyses
will be used to inform the proposed stream restoration design.
5.8.1.B Hydraulic Analysis QA/QC
Otak will coordinate with a subconsultant to provide an independent senior technical hydraulic quality assurance
and quality control review, in addition to Otak's internal quality control reviews in Task 11.1.3. The subconsultant
will review the hydrologic data and preliminary hydraulic analysis summary results prepared in the Phase 1
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Alternatives Analysis Report. They will consult with the design team at the start of 30°A) design and will perform
progress reviews of the hydraulic model developed under Task 5.8.1.A. The subconsultant has expertise in flood
gates and will provide guidance on model setup and review of results for the selected flood gate and operational
settings.
5.8.1.0 Preliminary Hydraulic Documentation
Otak will prepare a preliminary hydraulic documentation report that summarizes the findings and conclusions from
the hydraulic analysis completed in Task 5.8.1.A. The Report will summarize the following topics:
• Hydrologic flow rates used in the hydraulic analyses
• Hydraulic conditions including water surface elevations, depths, and flow velocities under existing and
proposed conditions
• Channel stability calculations
• Potential areas of channel erosion, sediment deposition
• Calculated preliminary scour depths at the crossing structure (100-year, and 500-year event)
A draft and final preliminary hydraulic memorandum will be submitted to the City. The final hydraulic analysis for
basis of final design will be performed under a future scope of work during final design.
TASK 5.8.1 DELIVERABLES
• Draft Preliminary Hydraulic Analysis Report (pdf)
• Final Preliminary Hydraulic Analysis Report (pdf)
TASK 5.8.1 ASSUMPTIONS
• SRH-2D or HEC-RAS 2D software will be used for development of the hydraulic model.
• 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.
• Wood stability calculations will not be performed during the preliminary hydraulic analysis to support 30%
design.
• City will provide one list of consolidated comments on the draft report. Comments will be addressed and
incorporated into the final report.
• The final hydraulic analysis for basis of final design will be developed under future scopes of work during final
design.
6.0 Alternatives Analysis
6.9 Alternatives Analysis Report - Phase 2
Otak previously prepared a Draft Alternatives Analysis Report under a separate task. Under this Task 6.9, Otak
will update the report to summarize findings of alternatives refinement work performed under Task 6.3 thru Task
6.8. The report will include a recommendation for a preferred alternative.
TASK 6.9 DELIVERABLES
• Alternatives Analysis Report Phase 2 (Draft and Final, electronic pdf)
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TASK 6.9 ASSUMPTIONS
• City will provide one list of consolidated comments on the draft Phase 2 Alternatives Analysis Report.
Comments will be addressed and incorporated into the final report.
7.0 Geotechnical Services (Subconsultant)
7.2 Geotechnical 30% Preliminary Design
The Phase 1 Geotechnical Investigation performed under a previous contact identified the presence of underlying
liquifiable soils and the need for ground improvements beneath proposed structural elements. Under Task 7.2, a
geotechnical subconsultant will prepare 30% design plans and a construction cost estimate for the bid items
related to the ground improvements work to be incorporated into the master estimate prepared under Task 11.1.2.
TASK 7.2 DELIVERABLES
• 30% Design plan sheets for ground improvements to be incorporated into plan set developed under Task 11.1
(half-size pdf)
• Construction Cost Estimate for ground improvements bid items
TASK 7.2 ASSUMPTIONS
• A detailed scope will be developed with the geotechnical subconsultant at a later date and submitted to the
City. An amendment will be prepared to update this scope task prior to commencement of this task work. The
task level of effort for the geotechnical 30% design has been estimated for this Amendment No. 2. If required,
the task fee will be re -negotiated with the City and modified through a future amendment.
8.0 Utility Coordination
8.1 Franchise Utility Coordination
Under a previous contract, Otak identified utilities known to be present at the site and received some utility as -
built drawings from utility providers, and a preliminary utility map was developed. Under this Task 8.1, Otak will
update the map to reflect the preferred alternative improvements selected by the City to be advanced into 30%
design. 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 begin communications with franchise utility companies (power, gas, telecommunications, water and
sewer, etc.) following the selection of a preferred 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. Otak will make recommendations for utilities to be
potholed to confirm location after the 30% design.
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.
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■ No major utility conflicts, that cannot be relocated by the Utility franchise is known or assumed to exist.
■ Potholing of utilities to verify the underground location is not included in this scope but is recommended to be
performed after 30% design.
9.0 Stakeholder Engagement
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, as requested.
As the level of effort for comment responses and coordination cannot be quantified at this time, a total level of
effort of 70 hours of staff time is assumed for this scope task.
TASK 9.2 DELIVERABLES
• Meeting notes (PDF)
• Email responses to agency and stakeholder comments
9.4 Engagement Materials
At the City's request, Otak will support the City with graphics to communicate project information to the public or
other interested parties or agencies such as improvement area maps, impact area maps, schedule, visualizations,
presentation slides, content for web postings, and GIS data.
As the level of effort for engagement materials and coordination cannot be quantified at this time, a total level of
effort of 150 hours of staff time is assumed for this scope task.
TASK 9.4 DELIVERABLES
• Deliverables are anticipated to include graphics in electronic PDF format, as requested by the City.
TASK 9.4 ASSUMPTIONS
• Available task budget and the scope of requested deliverables will be discussed with the City project manager
prior to commencing work on the requested deliverable.
11.0 Preliminary Design of Preferred Alternative
11.1 Preliminary Design - 30%
11.1.1 30% Preliminary Plans
Otak will advance the preferred alternative, selected by the City, to a preliminary (30%) design level. The primary
objective of the Preliminary Design is to allow the City to confirm the technical feasibility, cost feasibility,
compliance with permitting and grant requirements, maintenance feasibility and practicality, and buy -in from
interested parties.
Otak will prepare and submit Preliminary (30%) plans, listed in Table 3, that will include plan views of the crossing
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structure, crossing structure head walls, site retaining walls, trail, parking lot and habitat grading areas. The plans
will also include sufficient preliminary details to illustrate how the facilities will operate and maintenance access
will be provided.
Table 1 — Anticipated List of Drawings
Description
Included in
Preliminary
Design
Scale
Cover sheet, Vicinity Map, drawings, TOC
1
N/A
Legend and Abbreviations
1
N/A
General Notes, Phasing
1
N/A
Overall Site and Key Plan
1
1":50'
Survey Control Plan and Easements
1
1":50'
Traffic Control Plans and/or Detour Plans and Details
1
1":50'
Utility Relocation Coordination Plan and Details
2
1":20'
Crossing Structure Plan and Section
1
1":10'
Outlet Headwall Elevation View
1
1": 10'
Inlet Headwall Elevation View
1
1":10'
66th Ave. S Rd Restoration Plan and Profile
1
1 ":20'
Green River Trail Plan and Profile
2
1 ":20'
Parking Lot Pavement Plan
1
1":20'
Site Structural Details
2
N/A
Upstream Habitat Grading and Large Woody Material Plan
1
1":20'
Upstream Habitat Grading Section Details
2
N/A
Confluence Habitat Grading and Large Woody Material Plan
2
1":20'
Confluence Habitat Grading Section Details
2
N/A
Large Woody Material Details
1
N/A
Upstream Habitat Planting Plan
1
1":20'
Confluence Habitat Planting Plan
1
1":20'
Flood Gate Electrical Site Plan
1
1":20'
Flood Gate Details
1
N/A
TOTAL SHEETS
29
11.1.2 30% Construction Cost Estimate
Otak will estimate quantities and develop an itemized construction cost estimate for one bid package using unit
costs based on experience and recent similar project bid tabs. Quantities will be organized into standard bid items
(supplemented by additional non-standard items, if necessary) conforming to the project bid schedule. The
construction cost estimate will include appropriate contingencies to reflect the level of design complete.
11.1.3 Perform Quality Assurance and Quality Control
Otak will implement Quality Assurance and Quality Control to provide ongoing review on all hydrologic and
hydraulic modeling and site civil, structural, and landscape design throughout the design of the improvements.
Otak will provide quality assurance on all deliverable products to support this task, including work performed by
sub -consultants, and submit quality control check -list for all documents produced in this Task 11.1. This task
includes:
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1. Quality Review Checklist signed off by PM, Task Leads and an independent reviewer (as part of Task
5.8.1 B)
2. Reviewer Comments review meeting with the City
3. Written Responses to review comments
TASK 11.1 DELIVERABLES
1. Project Preliminary Plans, as listed in Table 1, will be prepared in AutoCAD, and submitted as PDF half -sized.
2. Construction Cost Estimate submittal includes electronic PDF.
TASK 11.1 ASSUMPTIONS
1. Work will be performed in accordance with WSDOT Standard Specifications for Road, Bridge, and Municipal
Construction (2025 edition).
2. No specifications will be included in the 30% Preliminary Design submittal.
3. Adjustments or relocation of franchise utility will be designed and constructed by the franchising public/private
utility company(ies), unless directed otherwise in future scopes of work for final design.
4. The Preliminary design will be based on the design concepts and layout of the Selected Alternative, selected
in Phase I of the project.
5. Tukwila will consolidate duplicate comments and approve or remove comments from all City reviewers prior to
delivery to Consultant.
6. Major design conceptual changes from the Selected Alternative, from Phase I, is not included in this scope
and fee estimate. If major changes are required to the concepts or layout of the Preliminary Design, then Otak
will assess the impact of the City required or desired changes, develop and submit contract supplement, with
the scope and fee estimate needed to revise the design submittal, and a request to Tukwila for approval to
use the Management Reserve Continency to revise the Preliminary Design.
11.2 Value Engineering Review
Otak will conduct a value engineering review of the concept design for the preferred alternative developed under
Task 6.9. This review will be performed by a team of senior professional staff with a representative from each of
the following disciplines:
o Water Resources Engineering
o Transportation Engineering
o Structural Engineering
o Landscape Architecture
Each review participant will review the Phase 1 Alternatives Analysis Report, alternatives refinement summaries,
and preferred concept plans and cost estimate developed under tasks 6.3-6.8. The value engineering review staff
will identify opportunities to reduce cost, and ease maintenance of the new facilities, while still meeting the goals
of the project, which are described in detail in the Alternatives Analysis. The Value Engineering team will have a
kickoff meeting with the project engineer and key designers at the start of the task. During the review, the value
engineering team will participate in a progress meeting with the City to and task leads from the design team to
discuss review questions and preliminary comments. Final comments from each reviewer will be entered into a
table with subcategories for the different disciplines. This table will be submitted to the City for review so any
direction for design changes can be given to the design team before completion of the 30% Design.
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TASK 11.2 DELIVERABLES
• Matrix of value engineering review comments on the concept plans and cost estimate for the preferred
alternative (pdf)
TASK 11.2 ASSUMPTIONS
• This study will precede the 30% Design and Constructability Review tasks, and will provide concerns to be
addressed in Task 11.1 and Task 11.3.
11.3 Constructability Review
Otak will coordinate and review all work provided by its constructability review subconsultant. Coordination will
include scheduling of work, scheduling of meetings, oversight and review of subconsultant deliverables.
The Constructability Review will provide comments on construction access, shoring and dewatering methods,
traffic control, schedule, and cost from a Contractor's perspective. This will include a field visit and review of the
preliminary plans once they are developed to a Draft 30% Level. The constructability review subconsultant will
perform the following items:
1. Site Visit
2. Review Preliminary Design and provide comments on the following:
a. Means and methods for excavation and shoring especially along liquifiable soils.
b. Construction sequencing and staging
c. Traffic Control
d. Options for accelerating work such as full and partial road closure and night work
e. Recommendations for Special Provisions
TASK 11.3 DELIVERABLES
• Memo summarizing constructability review comments (pdf)
• Plan markups (pdf)
TASK 11.3 ASSUMPTIONS
• This task will be implemented after the Value Engineering Review in Task 11.2 and during the 30% Design.
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 $20,000.00.
Direct Expenses
Direct expenses to be submitted for reimbursement include:
• Mileage/Travel for site investigations and meetings
• Other Misc. Expenses
Attachment A — Survey Extents Map
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Attachment A - Supplemental Survey Extents Map
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108
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Project Management and Coordination
Coordination with City
Project Monitoring and Reporting
Topographic Survey and Basemap
Supplemental Topographic Surveying and
Mapping of Green River
HYDRAULIC ANALYSIS
Gilliarn Creek Flap Gate Replacement Flood
Study -Proposed Conditions
Gilliarn Creek Flap Gate Replacement Flood
Study Report
Open Channel Hydraulic Analysis for
Proposed Improvement Area
Preliminary Hydraulic Analysis
Hydraulic Analysis QAIQC (SUB)
Alternatives Analysis
Alternatives Analysis Report- Phase 2
Geotechnical Services
Geotechnical 30% Preliminary Design (SUB)
Utility Coordination
Franchise Utility Coordination
Stakeholder Engagement
Agency and Stakeholder Coordination
Engagement Materials
Preliminary Design of Preferred Alternative
Preliminary Design - 30%
30% Preliminary Plans
30% Construction Cost Estimate
Perform Quality Assurance and Quality
Control
Value Engineering Review
Constructability Review (SUB)
Total Hours
Billing Rate
Total Labor Cost
Management Reserve
Direct Expenses
Project Total
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110
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2023 to 2028
PROJECT: Gilliam Creek Fish Barrier Removal Project No. 99830105
DESCRIPTION: 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.
JUSTIFICATION: Enable fish access to lower Gilliam Creek under wider range of flow conditions; fish barrier per WDFW and
City; WRIA 9 salmon habitat project.
STATUS: Analysis of lower Gilliam Creek is being conducted in 2018 to determine the best solution for fish passage
and to address potential flooding.
MAINT. IMPACT: Likely a shift in maintenance commitments with potential elimination of flapgate maintenance.
COMMENT: 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)
2021 2022 2023
2024 2025 2026 2027 2028 BEYOND TOTAL
EXPENSES
Design
60
150
600
650
1,460
Land (R/W)
0
Monitoring
0
Const. Mgmt.
1,000
1000
Construction
7,500
7,500
TOTAL EXPENSES
60
150
600
650
8,500
-
-
0
0
9,960
FUND SOURCES
Awarded Grant
150
325
375
850
Proposed Grant
275
275
6,800
-
7,350
Mitigation Actual
0
Mitigation Expected
0
Utility Revenue
60
0
0
0
1700
-
-
0
0
1,760
TOTAL SOURCES
60
150
600
650
8,500
-
0
0
0
9,960
Project Location
2023 - 2028 Capital Improvement Program