HomeMy WebLinkAboutReg 2017-11-20 Item 4M - Contract Amendment #1 - Riverton Creek Flapgate Removal Design with Otak Inc for $39,993COUNCIL AGENDA SYNOPSIS
Initials
Meetin{ Date
Prepared by y,..
Mayor's review.
Council review
11/20/17
RT`''
Motion
Date 11/20/17
"DL.12,
❑ Ordinance
Mtg Date
❑ Bid Award
AItg Date
❑ Public Hearing
Mtg Date
❑ Other
Mo Date
Mtg
SPONSOR ❑ Council ❑ Mayor ❑ HR
❑ IT
® PI/
❑ DCD • Finance ❑ Fire
❑ P&R U Police
SPONSOR'S Contract No. 17-070 with OTAK provides design services for the Riverton Creek Flapgate
SUMM 1RY Removal Project. Amendment No. 1 will add geotechnical, hydraulic modeling, a cultural
resource investigation, and stormwater modeling. As the design funds have been
exhausted, funding from construction will be required for this amendment. Additional grant
funding is expected for construction. Council is being asked to approve OTAK's
Supplemental Agreement No. 1 to Contract No. 17-070 in the amount of $39,993.00.
REVIEWED BY ❑ COW Mtg. ❑ CA&P Cmte
❑ Utilities Cmte ❑ Arts Comm.
DATE: 11/14/17
ITEM INFORMATION
ITEM No.
4.M.
133
STAFF SPONSOR: ROBIN TISCHMAK
ORIGINAL AGENDA DATE: 11/20/17
AGENDA IIF.M TITLE Riverton Creek Flapgate Removal Project
Design Amendment No. 1 with OTAK, Inc.
CATEGORY ❑ Discussion
Mtg Date
►1
Motion
Date 11/20/17
❑ Resolution
Mtg Date
❑ Ordinance
Mtg Date
❑ Bid Award
AItg Date
❑ Public Hearing
Mtg Date
❑ Other
Mo Date
Mtg
SPONSOR ❑ Council ❑ Mayor ❑ HR
❑ IT
® PI/
❑ DCD • Finance ❑ Fire
❑ P&R U Police
SPONSOR'S Contract No. 17-070 with OTAK provides design services for the Riverton Creek Flapgate
SUMM 1RY Removal Project. Amendment No. 1 will add geotechnical, hydraulic modeling, a cultural
resource investigation, and stormwater modeling. As the design funds have been
exhausted, funding from construction will be required for this amendment. Additional grant
funding is expected for construction. Council is being asked to approve OTAK's
Supplemental Agreement No. 1 to Contract No. 17-070 in the amount of $39,993.00.
REVIEWED BY ❑ COW Mtg. ❑ CA&P Cmte
❑ Utilities Cmte ❑ Arts Comm.
DATE: 11/14/17
❑ F&S Cmte
Comm.
CHAIR:
►1 Transportation
Cmte
• Parks
❑ Planning Comm.
DE'SEAN QUINN (ACTING)
COMM-II"EE
RECOMMENDATIONS:
SPONSOR/ADMIN.
COMMIITEE
Public Works Department
Unanimous Approval; Forward to Consent Agenda
COST IMPACT / FUND SOURCE
EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED
$39,993.00 $308,000.00 $0.00
Fund Source: 412 SURFACE WATER (PAGE 108, 2017 CIP)
Comments:
MTG. DATE
RECORD OF COUNCIL ACTION
11/20/17
MTG. DATE
ATTACHMENTS
11/20/17
Informational Memorandum dated 11/09/17
Page 108, 2017 CIP
OTAKS's Supplemental Agreement No. 1 to Contract No. 17-070
Minutes from the Transportation & Infrastructure Committee meeting of 11/14/17
133
134
City of Tukwila
Public Works Department - Robin Tischmak, Acting Director
Allan Ekberg, Mayor
INFORMATIONAL MEMORANDUM
TO: Transportation and Infrastructure Committee
FROM: Robin Tischmak, Acting Public Works Director
BY: Mike Perfetti, Habitat Project Manager
DATE: November 9, 2017
SUBJECT: Riverton Creek Flapgate Removal Proiect
Project Number 99830103
Contract 17-070, Amendment No. 1
ISSUE
Approve Amendment No. 1 to Contract No. 17-070 with OTAK, Inc.
BACKGROUND
In May 2017, the City entered into a consultant agreement with OTAK, Inc. for design services of the Riverton Creek Flapgate
Removal Project. This project will remove two culverts and flap gates where Riverton Creek joins the Duwamish River. A new trail
bridge will be installed over the new open channel which should improve fish passage.
DISCUSSION
Four additional service items have emerged since the OTAK contract was initiated:
1. OTAK has determined that the geotechnical investigations and hydraulic modeling were lacking key information needed for
the design of the new pedestrian Green River Trail bridge, modifications to the TIB bridge abutment, and channel bank
stabilization.
2. The City was notified by our funding partner, the State's Recreation and Conservation Office (RCO), that cultural resource
review will be required.
3. The Salmon Recovery Funding Board recently approved with conditions the City's RCO grant application stating that "this
project needs to demonstrate that increasing fish access to Riverton Creek will not increase toxic exposure to salmonids from
stormwater inputs...", meaning that additional stormwater water quality modeling is necessary.
4. Staff requested that OTAK conduct a brief alternative analysis exercise, and shift budget from other tasks to do so. To
partially offset cost increases, staff will take on a handful of items that were previously in the OTAK scope including permit
work and landscape design.
OTAK is providing a scope of services that includes additional geotechnical exploration, hydraulic modeling, cultural resource
investigation, and stormwater modeling. The additional work and completion of the remaining tasks will require additional contract
time and Amendment No. 1 will extend the time for performance to April 30, 2019.
FISCAL IMPACT
The current agreement with OTAK is for $105,363.00 and with Amendment No. 1 for $39,993.00, the total contract amount will be
$145,356.00. To fund Amendment No. 1, the project will utilize the 2018 CIP construction budget of $200,000. Two pending
grants, totaling $846,965.00, are expected to be executed in 2018, which will replace the borrowed City construction funds.
Agreement 2017-2018 Budget
Original OTAK Contract $ 105,363.00 $108,00.00
OTAK Amendment No. 1 39,993.00 200,000.00
$145.356.00 $308,000.00
RECOMMENDATION
Council is being asked to approve design Amendment No. 1 for $39,993.00 with OTAK, Inc. for the Riverton Creek Flapgate
Removal Project and consider this item on the Consent Agenda at the November 20, 2017 Regular Meeting.
Attachments: Page 108 of 2017 CIP
OTAK Supplemental Agreement #1
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136
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2017 to 2022
PROJECT: Riverton Creek Flap Gate Removal Project No. 99830103
DESCRIPTION: Remove two culverts and flap gates at Duwamish River; install pipe arch, create open channel confluence,
install trail bridge over new channel, restore/revegetate 200 feet of creek channel and 450 ft. of pond shoreline.
JUSTIFICATION: Increase available salmonid rearing habitat and increase flood refuge in lower Duwamish River. Improve
fish access to Riverton Creek and enhance salmon rearing and resting area.
STATUS: Design at 70% completion in 2011 with a Salmon Recovery Funding Board grant of $42,500 and $30,000
from People for Puget Sound. Construction is grant dependent.
MAINT. IMPACT: Expected to increase maintenance.
COMMENT:
Proposed grants include State & Federal habitat grants. Project used as mitigation for East Marginal Way
Pipe Replacement Project and HPA Control#133763-1 requires work to be completed by June 11, 2019.
FINANCIAL Through Estimated
in $000's
2015 2016 2017
2018 2019 2020 2021 2022 BEYOND TOTAL
EXPENSES
Design
114
10
108
232
Land (RNV)
0
Const. Mgmt.
100
100
Construction
650
650
TOTAL EXPENSES
114
10
108
750
0
0
0
0
0
982
FUND SOURCES
Awarded Grant
72
72
Proposed Grant
550
550
Mitigation Actual
0
Mitigation Expected
0
Utility Revenue
42
10
108
200
0
0
0
0
0
360
TOTAL SOURCES
114
10
108
750
0
0
0
0
0
982
2017 - 2022 Capital Improvement Program
108
137
138
City of Tukwila
6200 Southcenter Boulevard, Tukwila WA 98188
Agreement Number: 17-070 ( CJ)
CONTRACT FOR SERVICES
Amendment #1
Between the City of Tukwila and OTAK, Inc.
That portion of Contract No. 17-070 between the City of Tukwila and OTAK, Inc. is hereby
amended as follows:
Section 2. Scope of Services. The Consultant agrees to perform the services, identified on
Exhibit "A-1" attached hereto, including the provision of all labor, materials, equipment and
supplies. Exhibit A-1 supplements Exhibit A.
Section 3. Duration of Agreement; Time for Performance. This Agreement shall be in full
force and effect for a period commencing upon execution and ending April 30, 2019,
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 April 30, 2019 unless an extension of such time is granted in
writing by the City.
Section 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-1" attached hereto, provided that the total amount of payment to the Consultant
shall not exceed $145,356.00 without express written modification of the Agreement
signed by the City. Exhibit B-1 replaces Exhibit B.
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.
57L61-0/— c/i 66717 s
CA Revised December 2016
Page 1 of 2
139
City of Tukwila
6200 Southcenter Boulevard, Tukwila WA 98188
Agreement Number: 17-070
All other provisions of the contract shall remain in full force and effect.
Dated this -3o day of Or -}-abr , 2017.
CITY OF TUKWILA
CONTRACTOR
'LuJLLVi 1, ! -L
Allan Ekberg, Mayor Printed Name: 2, cc 1( Czcs. -t‹,
CA Revised December 2016
140
Page 2 of 2
Exhibit A- I
Scope of Work
Riverton Creek Flapgate Removal Project
City of Tukwila
October 17, 2017
Otak Project No. 32740
Amendment No. I
A 75 -percent design for the Riverton Creek Flapgate Removal Project was completed previously by
a different consultant. Under the original Scope of Work, Otak performed an Intake Review of the
previous design and found that on-site geotechnical evaluation, cultural resources, and hydraulic
modeling and scour analysis had not been provided with the previous design, even though stability
concerns had been documented. Further, based on a site investigation of existing conditions, Otak's
team recommended that the proposed channel section be revised to address slope stability and
erosion concerns.
The City requested an amendment to add services for the technical analysis and to make revisions to
the previous design. In order to reduce the additional cost, tasks were identified that could be led by
the City staff with support from Otak such as preparation of permit applications and landscape
design.
The following scope is for additional services required to complete the final design for the Riverton
Creek Flapgate Removal Project. These services are in addition to those set forth in the Scope of
Services of the Consultant Agreement for the project. The additional tasks are organized according
to the tasks being supplemented in the original contract; in addition tasks that are proposed to be
reduced or eliminated are described below.
The following table provides a summary of the contract value for the project as modified by
Amendment No. 1.
Contract
Authorized Fee
Original Contract
$105,363.00
Amendment No. 1
$39,993.00
Total
$145,356.00
141
Exhibit A-1 Scope of Work
Continued
New Scope Items
The following task list is new tasks that are to be added to the Contract. Following these tasks is a
section pertaining to Contract items that are to be modified because of changes in scope.
Task 2 — Intake Review
23 Alternatives Analysis and Meetings (New)
Otak will complete additional work related to development of conceptual plans and cost estimates
for two alternatives for the proposed open confluence of Riverton Creek and the Duwamish River.
Alternative 1 will include a pedestrian bridge with a revised channel section to allow for channel side
slopes less steep than the 1.25'H : 1'V slopes proposed in the 75% design by others. Alternative 2
will include a box culvert and wingwalls. Otak's subconsultant, GeoEngineers, will review the
concept designs and provide comments on stability and recommendations for geotechnical
evaluation.
Task 4 — Permitting, Environmental Review and Coordination
4.8 Water Quality Monitoring (New)
In order to provide an initial assessment of potential stormwater impacts to salmonids, Otak will
evaluate water quality conditions in the system using the WSDOT Hi -Run model and field
verification of existing conditions. The model and field verification will extend from the confluence
of Riverton Creek and the Duwamish River upstream to the culverts conveying Riverton Creek
under SR 599. Work for the Hi -Run modeling effort will involve collecting information on the
discharge area for contributing stormwater, precipitation data, existing baseline conditions, end -of -
pipe -loading subroutine, and receiving water dilution subroutine. Otak will prepare a technical
memorandum describing and interpreting the modelling and field verification results.
Task 6 — Hydraulic Analysis (New)
This task includes the hydraulic analysis necessary to support the design of the removal of two flap
gates and creek channel restoration for Riverton Creek at the confluence with the Duwamish River.
A previous hydraulic analysis was conducted by Northwest Hydraulic Consultants (NHC) to
evaluate any potential increased flood risk from the flap gate removal. The analysis was based on a
long-term (52 -year) HEC -RAS unsteady flow simulation to evaluate potential changes in the
frequency of water levels along the creek. The long-term simulation accounts for the complex
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Exhibit A-1 Scope of Work
Continued
interaction of Riverton Creek and the Duwamish River wherein the hydraulic conditions at the
confluence are governed by the timing of flows in the creek and stages on the river. However, due
to the configuration of the model that includes a storage area at the upstream side of the existing
outfall, detailed hydraulic information (velocities, etc.) in the design reach is not available. The
hydraulic analysis presented here builds on the NHC hydraulic analysis to obtain the necessary
hydraulic design information as described in this task.
6.1 Data Review
Review the previous hydraulic model and report (NHC, 2010).
6.2 Statistical Analysis
Perform a statistical analysis of the time series data from the NHC hydraulic analysis to develop the
joint probability of flows in Riverton Creek and stages on the Duwamish River. This will provide a
range of plausible flow scenarios for the hydraulic analysis of Riverton Creek at the confluence.
Deliverables:
• Results of the statistical analysis and recommended flows and stages for use in the hydraulic
analysis of Riverton Creek.
6.3 Hydraulic Analysis
Construct a detailed one-dimensional (1-D) steady flow HEC -RAS model of Riverton Creek for the
study reach that extends from the confluence with the Duwamish River to the northbound SR -599
on ramp. Cross sections along Riverton Creek will be based on available topographic survey data of
the study reach. The model will be configured for existing and proposed conditions and run for a
range of design flows and Duwamish River stages based on the joint probability analysis performed
for Task 6.2.
Assumptions:
• Available survey data are sufficient for the development of accurate cross sections for use in
the hydraulic analysis
Deliverables:
• Electronic files of the hydraulic model
6.4 Channel Stability Analysis and Hydraulic Design of Scour Countermeasures
Utilize results of the hydraulic analysis to assess the impacts of the flap gate removal on hydraulic
conditions and the stability of Riverton Creek, and to develop the hydraulic design of any necessary
scour countermeasures at the site of the flap gate removal and replacement pedestrian bridge. Any
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Exhibit A-1 Scope of Work
Continued
necessary scour calculations will be included in the analysis to support the design of scour
countermeasures (toe -down depths).
Assumptions:
• Evaluation of channel stability impacts upstream of the flap gate removal will be based on
assessment of changes in predicted hydraulic conditions and will not include detailed channel
stability or sediment transport calculations.
• This task does not include detailed design drawings or cost estimates that are assumed to be
covered by other project tasks.
Deliverables:
• Scour and design calculations
6.5 Technical Memorandum
Write a draft and final technical memorandum that documents the hydraulic analysis and results.
Deliverables:
• Draft and final technical memorandum in electronic format
Task 7 — Geotechnical Analysis (New)
This task includes a geotechnical evaluation by GeoEngineers, a subconsultant to Otak. Phase 1
geotechnical services included a brief review of preliminary drawings and available existing
subsurface information, including the 1996 geotechnical report, as -built drawings of the existing TIB
bridge and sheet pile wall, and a site visit with the design team. Phase 2 services will include
completing geotechnical explorations for the planned pedestrian bridge, completing engineering
analysis to support final design, preparing a final geotechnical report for the project, providing
consultation, and reviewing the project plans and specifications, as needed.
This contract amendment includes scope and fee estimate for Phase 2 of the project. Our Phase 2
scope assumes the as -built drawings will provide information on the backfill type and geometry
behind the sheet pile wall for design of the ground anchors and explorations behind the wall are not
necessary. Our specific scope of services for Phase 2 is presented below.
7.1 Explorations and Final Design Report
1. Review available subsurface information including our 1996 geotechnical report, as -built
drawings of the existing sheet pile retaining wall, and available geologic and topographic
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Exhibit A-1 Scope of Work
Continued
maps. We assume Otak, Inc. (Otak) and the City of Tukwila (City) will provide as -built
information for the existing bridge and wall.
2. Review preliminary drawings for the planned project including trail improvements, flapgate
removal and culvert modifications, and upgrades to the bulkhead.
3. Complete a site reconnaissance to observe the existing surficial conditions of the site.
4. Develop approach for tie -back and sheet pile wall analyses.
5. Explore subsurface conditions at each end of the planned pedestrian bridge by completing
two geotechnical borings to depths of about 50 to 60 feet. The preliminary depths were
estimated to determine the contact elevation between the anticipated sand layer and lower
very soft organic silt layer. It may be necessary to drill deeper borings through the lower
organic silt layer, depending on the foundation loads and seismic requirements of the bridge
structure. The drilling services will be subcontracted to GeoEngineers and will be completed
using hollow -stem auger or mud rotary drilling equipment. We will contact the Washington
State One -call service to locate the explorations in areas that are clear of underground
utilities. We will also use a subcontract a private utility locate service, to locate utilities not
covered by the one -call service. The drilling will generate excess soil that will not be replaced
in the borehole. Our scope and fee estimate assumes that the soil cuttings will be left on site
and that the site restoration, is not necessary. If the soil cuttings will need to be hauled off-
site, then additional expenses will be needed. The borings will be backfilled in accordance
with the Department of Ecology's requirements.
6. Evaluate pertinent physical and engineering characteristics of the site soils based on
laboratory tests from the borings. The laboratory tests will include moisture content, grain -
size distribution, Atterberg limit determination, and percent fine contents, as appropriate.
7. Prepare a draft and final geotechnical design report. Our specific scope of services for the
design -level report will include the following:
• Project vicinity map and site plan showing the location of the geotechnical exploration
with
• respect to the proposed development including new or previously completed
explorations.
• Previous boring logs and boring logs and laboratory test results completed for this
study (if
• completed).
• Summary of subsurface soil and groundwater conditions.
• Seismic design recommendations based on the current International Building Code
(IBC).
• Foundation design recommendations (axial and lateral pile capacity) for the
proposed
• pedestrian bridge. We have assumed the foundations will consist of deep piles.
• Anchor recommendations for stabilization of the existing sheet pile wall.
• Recommendations for stability of site slopes, including stability evaluations and
• recommendations for the existing steep slopes in front of the sheet pile wall where
tie -backs
• may be needed for the planned project.
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Exhibit A-1 Scope of Work
Continued
• Recommendations for earthwork including:
o Stripping, removal of soft, organic or other unsuitable material;
o Excavation considerations including temporary cut slope inclinations;
o Placement and compaction of structural fill;
o A discussion on the effects of weather and construction equipment on the site
soils; and
o A discussion on site drainage and dewatering, if necessary.
8. Provide consultation to the design team including reviewing the plans and specifications for
conformance to our geotechnical recommendations.
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Exhibit A-1 Scope of Work
Continued
Scope and Budget Modifications
Several tasks are forecasted to be under budget or are reduced in scope, which will reduce the
budget requirement, and include the following:
2.4 Develop Permitting Strategy Plan
This task is omitted. The City will lead the permitting effort. Any permitting support, if requested
by the City, will be provided under Task 4.7 Permitting Support.
3 Coordination Meetings
This task is omitted. Otak will facilitate meetings to review assessment of alternatives under new
Task 2.5. Any participation of a meeting with permitting agencies, if requested by City, will be
provided under Task 4.7 Permit Support.
4.1 JARPA Preparation
The scope for this task is reduced. The City will prepare the Joint Aquatic Resources Permit
Application (DARPA) for the project including the preparation of the required drawings. The JARPA
and existing Critical Areas Report will be used to apply for and support a Washington State
Department of Fish and Wildlife (WDFW) Streamlined Hydraulic Project Approval (HPA) for a fish
habitat enhancement project. The City will prepare the complete application and manage the
submittal. Otak will provide support and review of the draft application materials, as requested.
4.2 Specific Project Information Form (SPIF)
The scope for this task is reduced. The City will prepare and submit the Specific Project
Information Form (SPIF), per the Programmatic Biological Assessment (PBA) for Restoration
Actions in Washington State and associated Biological Opinion (BiOp). Otak will provide support
and review of the draft form.
4.3 Cultural Resources
This task is revised to include a Cultural Resources Assessment by Cultural Resource Consultant
(CRC), a subconsultant to Otak.
CRC will provide the following project components as part of this cultural resources assessment:
• 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,
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Exhibit A-1 Scope of Work
Continued
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.
• 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.
4.4 Ecology Construction Stormwater General Permit
This task is omitted. The City or the Contractor will submit for this permit once the project is
scheduled for construction.
4.5 Wetland Delineation
The scope for preparing a Critical Areas Report is reduced to only include the preparation of a
memorandum to supplement the Critical Areas Assessment prepared with previous work.
4.6 Agency Meetings
This task is omitted. Any participation of a meeting with permitting agencies, if requested by City,
will be provided under Task 4.7 Permit Support.
4.7 Permitting Support
The scope for this task is reduced to include the attendance of up to two meetings with permitting
agencies by two Otak staff. Each meeting is assumed to take 3 hours including travel time.
Task 5 — Final Design
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Exhibit A-1 Scope of Work
Continued
The preparation of final signed bid set plans and specs is removed from the scope. A final bid set
can be prepared later once additional funding has been secured for construction.
5.1 Final Design and Plans Sheets
4 Creek Grading, Trail Restoration, and Bank Armoring Design
The scope for final design and plan preparation is revised as the City will perform all landscaping
design for revegetation of Riverton Creek and for edge restoration along Green River Trail. The
City will provide construction plan sheets for all landscaping features including the placement of
Large Woody Debris (LWD). The City will also provide all planting details. Otak will provide the
details for LWD. Otak will also provide electronic drawing files for the sheet titleblock and any civil
basefiles that the City will need to prepare the landscaping sheets.
Otak will revise the grading prepared previously (by others) to allow for channel side slopes with a
maximum slope of 1.75'H : 1'V. It is assumed that this proposed slope will be able to be stabilized
with a bio -engineered system with components such as LWD, rip -rap, plastic geocell, and
biodegradable matting that is compatible with the City's design for slope vegetation.
This scope does not include engineering for a mechanically stabilized earth wall or soil nails for
channel slope stabilization.
6 Retaining Wall Design (3 sheets)
The scope for final design and plan preparation is revised to include a retaining wall adjacent to the
parking lot with greater vertical and horizontal extents. It is assumed that this wall will be a
reinforced concrete retaining wall.
A computer -modeled visualization is omitted from the scope.
5.2 Specifications
The scope for this task is reduced as the City will lead the preparation of the master Contract
Manual and the preparation of landscaped Special Provisions. Otak will provide General Special
Provisions (GSP) and project -specific Special Provisions for Divisions 2 — 9, excluding the
landscape and planting Special Provisions. The City will prepare Special Provisions for all landscape
and planting work including topsoil, compost, seeding, and plant establishment.
The City will prepare Division 1 of the Specifications and compile the master Contract Manual
including all Contract and Bid Forms, Amendments to the WSDOT Standard Specifications, and
Appendices. The City will incorporate Special Provisions provided by Otak.
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Exhibit A-1 Scope of Work
Continued
Otak will provide a review of the Specifications Manual at the 90 percent and Final design levels.
The City will provide revisions as necessary.
Otak will prepare an estimated construction schedule to determine the number of working days for
the construction contract, for review by the City at approximately the 90 percent design level.
Deliverables:
1. Special Provisions at 90 -percent and 100 -percent design (pdf format and MS Word format).,
sealed by a Washington state registered PE.
2. Estimated construction schedule, draft and final in Microsoft Project (.mpp and .pdf format).
5.3 Construction Cost Estimates
The scope for this task is reduced as the City will provide quantities and unit costs for all
landscaping bid items.
Otak Project Expense Budget
Expense costs will be significantly less than projected and site visits that will incur mileage costs will
be limited.
W:\PW Eng\PROJECTS\A- DR Projects \ Riverton Flap Gate Removal (99830103 98-DR03)\Consultant Selection\Phase
2\contract \Amendment #1\Riverton SOW_Amend 1_17_1027.docx
150
10
Exhibit B -I - Fee Estimate
City of Tukwila - Riverton Creek Flapgate Removal Project
Otlk, Inc, Project 32740
AMENDMENT NO. 1,10/26/17
Task D scrpt.n
Phase 1 - Intake. Review and Charter Mettiag
Task l Project Management
11Project Masugenseut and Coonlinaion
12 Qual y As uce/Quaky Com 4
Task Intake Review
2.1 Realew Existing Data
22 She Reco.uissysce
23 Intake Rev.ew met Develop Design Catena
Fi
2-5 Altemauves Analysis and blecuhgs
c,, .divseiee-Mea-eisng.
Phase 1 Total Hours
Total Labor Cost, including Overhead and Profit
Direct Expenses
Phase I Project Total
Task 4 Perm ining, Emir -nom ental Review and Coordination
4.1 JARPA Preparation
4.2 Specific Project Information Form (SP IF)
4.3 Cultural Resource (CRC)
4.5 Wetland Delineation
4.7 Permit Suppon
4 6 Water Quality Monitoring
Task Final Deeign
5.1 Design and Plan (tat finalize exis..i0 16 sheets)
1.90° a Plans
2 1003, Plass
lfe..I PSC B:.I S,t
52 Specifications n0 new specs alions based on template provided
1. 90°.a Specs....
_... 2 1009'° Specs
3. f:...I PS0 B:d S-
5.3 Constmeion Cost Estimates (updating Estimate and quint provided)
1 90°.: Cost Estimate...
2 100?'°Cost Esthnate
3. 9,2 PF643'd 1
Task Hydraulic Analyses
6.I Data Review,
6 2 Statistical Analysis
6.3 Hydraulic Analyses
6.4 Channel Stability Analysis and Hydraulic Design of Scum C u.emsea.n,
6.5 Technical Memorandum
Tvk7 O om<6nical Analysis _ 7.1 Explarauans and Final Design Report
Phase 2 Total Hours
Total Labor Can, including Overhead and Profit
Direct Expenses
Phase 2 Project Total
Project Total Hours (Phases 1-2)
BBliug Rate (including OH and Profit)
Tutsi Labor Cost, including Over cad and Profit
_..... Duect Expenses
Mgmt.
Structural
viromnem
Rater
SOO
Hydraulic
Latdsc
6.ADD
Adm.
10
T.13
0
zip
v 6
<
u 2
Lo_
a1
iss
Cultural
O 0
utm
0
F�-
6
12
32
4
4
12 90 ... 4 10 32 _.. ....
S
2816 1 12141 1 757. 1 1,320 1 3,332 5 - $
2
2
_.... 16
........
272 5 1 - 1 1,123
40
70
4
16
60 $ 8,074
32 13,939
28 84,135
106 $ 13,687
10 11,144
10 11.338
18 122;118
68
166
18,587
3 21,761
100
21,761 1 100 $ 1,800 $ -
1,800
11,800
81,800
201 1 18,240
26 12,310
14 11,159
112
$9,228
17 11,993
32 13,550
460 $ 52,165
286 131,612
15,600
15.600
8,074
$4,135
15,487
13,138
12-418
58,587
23,561
100
$ 23,661
23,840
12,310
11,159
85,600
19,228
81,993
83.550
$ 52,165
531,612
4
76
16 4
30 8
16 8
12
12
124 $ 14,490
5 8647
20 12,062
42 14,589
27 13,243
30 13,949
10 100
1 2,346 $ 13,490 1
-
40 96 26 60 9a 128 134 38 8 14 6 24 6
8 5.279 1 9,994 1 3,450 $ 7,019 1 5.795 1 13,516 1 11.595 1 6,431 1 1,354 1 1.899 1 56.1 1 1,721 1 421
22 190 4 50 128 26 60 95 128 134 38 8 16 6 24 22
__. _... _..... 01.
f^-34.40 $134.90 1189.16 1131.97 110410 11326 6 W 7 $11730 561 1105.59 186 53 1169.21 $169.21 $135.6] $93.81 171 67 $70.15
$ 5,162 $ 25.631 1 757 1 4,599 1 13,325 1 3,450 1 7.039 0 5,795 f 13,516 $ 11595'. f 6411 1 1,354 1 2,171 1 564 1 1321 $ 1544
1 84,895
951
14,490
5647
12,062
14,589
13,241
83,949
31,000
121,495
350
$ 121,845
145,054
300
Project Total (Phase. 1-2)
3 106,656 $ 300 $ 32,800 $ 5,600
$ 145,356
ORIGINAL CONTRACT 1 105,363
AMENDMENT NO. I ADDITIONAL FEE $ 39,993
W:\P W PROJECT'SEng \ \A- DR Projects\ Riverton Flop Cite Removal (99830103 98-DR03)\Consultant Selection \Phase 2\contract\Amendment 01 \Copy of Riverton Fee Est_Amend 1_ 17_1027
152
City of Tukwila
City Council Transportation & Infrastructure Committee
TRANSPORTATION & INFRASTRUCTURE COMMITTEE
Meeting Minutes
Novemberl4, 2017- 5:30 p.m. - Foster Conference Room, 6300 Building
Councilmembers:
Staff:
Guest:
De'Sean Quinn, Acting Chair; Dennis Robertson, Verna Seal
Robin Tischmak, Ryan Larson, Greg Villanueva, Mike Cusick, Mike Perfetti, Pat Brodin,
Gail Labanara, Moira Bradshaw, Jack Pace, Laurel Humphrey
Jeff Pierson, Fehr and Peers
CALL TO ORDER: Acting Chair Quinn called the meeting to order at 5:30 p.m.
I. PRESENTATIONS
II. BUSINESS AGENDA
A. Grant Acceptance: NPDES Stormwater Capacity Grant
Staff is seeking Council approval of a grant agreement with the Washington State Department of
Ecology for a $50,000 2017-2019 Water Quality Stormwater Capacity Grant. Funds will be used to
assist Phase 1 and 11 Permittees in implementation or management of municipal stormwater
programs and no matching funds are required. UNANIMOUS APPROVAL. FORWARD TO
NOVEMBER 20, 2017 REGULAR CONSENT AGENDA.
B.
2017 Surface Water Management Program Survey, and Assessment
Staff presented the results of the 2017 Surface Water Management Program Survey and
Assessment, which was performed to comply with the National Pollutant Discharge Elimination
(NPDES) Phase 11 permit requirement to measure residential stormwater knowledge and
behavior. Hebert Research, Inc. conducted the 2017 phone survey which reached 50 businesses
and 250 residences. Correct answers to priority 1 issues were less than 50%, priority 2 were
between 50-80%, and priority 3 were over 80%. DISCUSSION ONLY.
C. Consultant Agreement: Martin Luther King, Jr. Way South Water Main
:01)
Staff is seeking Council approval of an agreement with Carollo Engineers in the amount of
$69,967.00 for design of the Martin Luther King (MLK) Way South Water Main Project. This project
will replace 800 LF of 12" water line and hydrants in an area found to be heavily corroded during the
construction of the Sound Transit light rail line. UNANIMOUS APPROVAL. FORWARD TO
NOVEMBER 20, 2017 REGULAR CONSENT AGENDA.
Contract Amendment: Riverton Creek Flapgate Removal Project
Staff is seeking Council approval of Supplemental Agreement No. 1 with OTAK, Inc. in the amount
of $39,993.00 for the Riverton Creek Flapgate Removal Project. This project will remove two culverts
and flap gates where Riverton Creek joins the Duwamish River. A new trail bridge will be installed
over the new open channel to improve fish passage. The supplemental agreement will include
additional geotechnical exploration, hydraulic modeling, cultural resource investigation, and
153
Transportation & Infrastructure Committee Minutes November 14, 2017
*stormwater modeling and extend the contract expiration date to April 30, 2019. UNANIMOUS
APPROVAL. FORWARD TO NOVEMBER 20, 2017 REGULAR CONSENT AGENDA.
E.
F.
G.
154
Grant Acceptance: Non -Transportation Commute Trip Reduction Pilot Program
Staff is seeking Council approval of a grant award with WSDOT in the amount of $107,000 to
implement a pilot program to reduce regional congestion and improve air quality in Tukwila and
South King County. The funding opportunity was designed to pilot the expansion of Transportation
Demand Management (TDM) programs beyond traditional Commute Trip Reduction (CTR) affected
sites into new markets. King County Metro and the Port of Seattle are providing the required $25,000
local match. UNANIMOUS APPROVAL. FORWARD TO NOVEMBER 20, 2017 REGULAR CONSENT
AGENDA.
Tukwila International Boulevard Retrofit Implementation
Staff updated the Committee on implementation of the community's vision for the Tukwila
International Boulevard (TIB) neighborhood and the Congress for New Urbanism (CND's)
recommended action on a rechannelization design. The CNU report suggested thatthe City change
the street design to reduce through -lanes to two from four, allowing on street parking and bicycle
lanes and adding crosswalks. The City contracted with Fehr& Peers to study the impacts associated
with the lane removal and potential mitigation. The study found that at least 50% of existing traffic
is pass through and unrelated to local business or residences. Traffic diversion will occur on
adjacent streets in the order of 42nd Avenue South, Military Road South, 1-5, Des Moines Memorial
Drive South, and 51St Avenue South/Macadam Road. By 2030, traffic would increase by 20% under
the road diet scenario. The study also found that typical traffic calming measures on side streets
would not be effective in preventing the traffic diversion, but intersection diverters or short one-
way segments could help. KPG, Inc, prepared three preliminary design options and cost estimates
that all include removal of the two lanes plus parking and a bicycle lane. Alternative 1 would add
bulb -outs at mid -block pedestrian crossings ata cost of $1,130,000, Alternative 2 would only
restripe ata cost of $250-400,000, and;Alternative>3 would add crosswalks anal bulb -outs at
intersections at a cost of $1,270,000. Staff recommends implementing Alternative 2 because it is a
low-cost option to help staff evaluate traffic impacts prior to further investment. The Committee
discussed the study's findings. CouncilmemberRobertsonsuggesteddivertingtrafficfurthersouth
down by South 130t" Street in orderto avoid a traffic increase on 42nd Ave S. Councilmember Quinn
suggested painting zones and increasing Police speed enforcement, like in Bellevue. He stressed
the importance of protecting the residential streets. The Committee did not arrive at a
recommendation but requested staff return in 2018 at the Committee level to continue discussing
the options. NO RECOMMENDATION. RETURN TO COMMITTEE.
Final Construction Settlement: Interurban Avenue South
Staff is seeking Council approval of a final settlement and Change Order No. 9 with Walsh
Construction in the amount of $1,081,259.15 for the Interurban Avenue South Project. Walsh has
asserted that the project encountered unexpected impacts and has sought additional
compensation, which the City disputed. The parties have been in mediation since June 2017 and
this settlement represents the agreed upon terms. Funding for this settlement is aided by an
additional $750,000 from the State Transportation Improvement Board and $35,000 in traffic
impact fees. With a final contract amount of $8,917,921.31, the City's overage is $165,000. The
Committee requested that staff amend the informational memo to clearly show where the $165,000