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BUSINESS OF THE CITY COUNCIL
YAKIMA, WASHINGTON
AGENDA STATEMENT
Item No. 4.G.
For Meeting of: October 6, 2020
ITEM TITLE: Resolution authorizing an addendum to an agreement with Perteet,
Inc. for the Cowiche Canyon Trail Project
SUBMITTED BY: Scott Schafer, Director of Public Works
Bob Desgrosellier, Acting Chief Engineer, 575-6228
SUMMARY EXPLANATION:
In June of 2015, the Cowiche Canyon Trail project was selected as one of the Tier 2 Pedestrian
and Bicycle Safety Projects of the Connecting Washington funding program; awarding the City of
Yakima (City)with a $2,000,000 Connect Washington grant. The project is to further extend the
Cowiche Canyon Trail by constructing approximately two miles of new pathway with
bike/pedestrian bridges. In 2017, the City used the MRSC Roster process to select Perteet,
Inc. to develop the project and design the plans.
Since the original agreement with Perteet, Inc., City staff with the assistance of Perteet, have met
several times with property and homeowners along the proposed pathway in trying to arrive at an
agreeable pathway alignment. Based on the latest desire of the property owners, the pathway
has undergone a significant change in alignment. This has resulted in additional tasks including:
surveying, calculating right-of-way needs, mapping, etc., along with an extension of the project
management timeframe to complete preliminary engineering and design. The William 0'
Douglas Trail, Cowiche Canyon Conservancy, and the Yakima Bicycle Pedestrian Advisory
Committee have been kept apprised to these significant changes. In order to proceed with the
project, an addendum is required to the original agreement with Perteet, Inc.
The terms of the Addendum to the Agreement (Amendment No. 2)with Perteet shall be in an
amount not to exceed $98,351 and has been attached for City Council review. The additional
expenditure of$98,351 to realign the pathway will be funded out of the $2,000,000 Connect
Washington grant.
ITEM BUDGETED: Yes
STRATEGIC PRIORITY: Neighborhood and Community Building
STAFF RECOMMENDATION:
2
Adopt Resolution
BOARD/COMMITTEE RECOMMENDATION:
ATTACHMENTS:
Description Upload Date Type
D Rost-)Litton Portent Amendment No 2 9 24/21120 Resolution
0 Pertcct knenclincint No 2 9 24 2920 Resolution
3
RESOLUTION NO. R-2020-
A RESOLUTION authorizing an Addendum to an Agreement with Perteet, Inc. for
the Cowiche Canyon Trail Project.
WHEREAS, the Yakima City Council has accepted a 2015 grant from the State
Legislature's Tier 2 Pedestrian and Bicycle Safety Projects as part of the Connecting
Washington funding program in the amount of$2,000,000, and
WHEREAS, the City of Yakima followed the procedure established by the State
of Washington to select and recommend an engineering consulting firm using the
Municipal Research and Service Center (MRSC) Professional Services Roster process
to select a firm to perform the design work; and
WHEREAS, Perteet, Inc. was determined to be the most qualified firm to prepare
the plans and oversee the work, and has shown that they are qualified to perform the
work required; and,
WHEREAS, since the execution of the original Agreement in 2017, the City
decided on an alternative alignment for the Cowiche Trail that requires additional
surveys and right-of-way acquisition; and
WHEREAS, the amended Scope of Work and Budget included in this addendum
meet the needs and requirements of the City of Yakima for this project in the amount not
to exceed $98,351; and
WHEREAS, the City Council finds that it is in the best interest of the City of
Yakima and its residents to enter into this amended agreement to continue and complete
this project, now, therefore,
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF YAKIMA:
The City Manager is hereby authorized to execute an Addendum to an
Agreement between the City of Yakima, Washington and Perteet, Inc. attached hereto
and incorporated herein by this reference not to exceed an additional Ninety-Eight
Thousand, Three Hundred and Fifty-One Dollars ($98,351) to provide the professional
services as described in the Addendum to the Agreement.
ADOPTED BY THE CITY COUNCIL this 6'h day of October, 2020.
Patricia Byers, Mayor
ATTEST:
Sonya Clear Tee, City Clerk
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2302 W Dolarway Road Suite I Ellensbur g WA 98926 P 425 252 7700
City of Yakima
Cowiche Canyon Trail
AMENDMENT NO. 2
City of Yakima, "CLIENT" desires to amendment the agreement entered into with Perteet,
Inc., "CONSULTANT" executed on April 19, 2017, and first amended on March 2, 2020. All
provisions in the basic agreement remain in effect except as expressly modified by this
amendment.
The changes to the agreement are described as follows:
SECTION 2: SCOPE OF SERVICES
The original scope of services will be amended to include additional services to complete the
project as described in Exhibit"A", attached hereto and made a part of this agreement.
SECTION 5: COMPENSATION
This section shall be amended as follows:
These additional services will cause an increase in the amount of Ninety-Eight Thousand
Three Hundred Fifty-One Dollars ($98,351). These additional services will be invoiced
in accordance with Exhibit "B", fee determination.
If you concur in this amendment and agree to the changes as stated above, please sign in the
appropriate spaces below and return to this office for final action.
Dated this day of , 2020.
CITY OF YAKIMA PERTEET, INC.
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Crystal L. Donner
President
TITLE:
City of Yakima Co %iche Canyon'flail Page 1
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2302 W.Dolarway Road,Suite 1,Ellensburg,WA 98926 P 425.252.7700
Exhibit "A"
Amendment No. 2
City of Yakima Cowiche Canyon Trail
INTRODUCTION
The original scope of work for this project included preparation of plans, specifications, and opinion
of cost(PS&E)for a shallow bridge foundation. Upon further investigation of site conditions, the
City has elected to proceed with a deep foundation design instead of a shallow foundation. This
amendment provides for exploratory drilling and subsequent analysis and design associated with
preparing PS&E for a deep bridge foundation.
Additionally, this amendment provides for"no-rise" hydraulic analysis required by Yakima County
for bridge permitting and scour analysis to support bridge design.
NEW WORK ELEMENTS (ADDED WITH THIS AMENDMENT)
Work Element 22—Bridge C Pile Foundation, Scour and No-Rise Analyses (Aspect)
We understand pedestrian Bridge C (bridge)proposed to be located at the northeast portion of
the alignment will cross over Cowiche Creek. The bridge is preliminarily planned to be about
200 feet long -from approximately Station 537+00 to 539+00 —and will be supported by end
abutments and two interior piers.
From collaboration with the design team, we understand a pile foundation is the preferred
foundation system to support the new bridge. On-Site stormwater management via infiltration
trenches are also planned along the trail portion to the south of the bridge from approximately
Station 514+00 to 536+00. We propose to supplement our contracted geotechnical study by
completing machine drilled borings at bridge abutment/pier locations, test pits near the
stormwater infiltration trenches, pile foundation analysis, in-situ soil infiltration rate correlations,
creek channel/bank scour analysis, and a no-rise analysis, as detailed below.
We understand the bridge will generally be designed in accordance with AASHTO LRFD Guide
Specifications for the Design of Pedestrian Bridges, with project-specific design criteria
modifications/omissions as directed by the City of Yakima (if any).
Our detailed scope of supplemental work consists of:
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2302 W.Dolarway Road,Suite 1,Ellensburg,WA 98926 P 425.252.7700
Task A: Machine Drilled Borings at Bridge Foundations and Test Pits at Infiltration
Trenches
Aspect will coordinate, complete and document up to four machine drilled borings at the
proposed bridge end abutments and interior piers to explore subsurface conditions, including
depth and composition of underlying basalt bedrock to serve as pile end bearing layer.
We will mark the proposed boring locations in white paint and/or stakes for planning and utility
locating. We will use the public one-call utility locating service to clear the proposed areas of the
borings. We should be provided with any drawings or other information available on utility
locations within the limits of the Site. Our fee does not include utility repair costs. We will take
reasonable precautions to reduce the potential for damage to utilities; however, Aspect does not
assume responsibility for the cost of repairing utilities that are unmarked or incorrectly marked.
Aspect will mobilize a drilling subcontractor to the Site to complete up to four borings over a
duration of 3 to 4 days in the field. The drilling will be supervised and logged full time by an
Aspect field representative. The borings will be advanced with a track mounted drill rig using
methods tailored for drilling in the anticipated gravel, cobble and boulder laden soils, and down
to basalt bedrock, which is estimated to be about 50 feet deep below ground surface. Standard
Penetration Test sampling will be completed within the overburden soil at selected depths. Upon
encountering basalt bedrock, the driller will switch over to rock coring methods, and will
advance 5 to 10 feet into the basalt bedrock to collect rock cores and record Rock Quality
Designation (RQD).
Samples of the encountered soils and bedrock will be collected for additional observation and
laboratory testing at our discretion. The borings will be backfilled with bentonite chips per
Washington State regulations. No further Site restoration is planned or included.
We assume you and/or other Project stakeholders will coordinate and provide ready access and
permitting for the soil borings, along with any required earthwork and clearing for the drill rig
access, coordination with individual landowners and the local jurisdictions regarding public
notification of the field work. Aspect will oversee the earthwork and clearing for drill rig access
as part of Task B below.
Boring logs, laboratory test results, and a site map showing the locations of the borings will be
prepared and included in the geotechnical report.
Task B: Test Pits and Laboratory Testing at Infiltration Areas and Drill Rig Access
Oversight
Aspect will observe and log up to four test pits near the trail and proposed stormwater infiltration
trenches with excavation equipment, personnel and utility locating responsibilities
provided/managed by the Project stakeholders. Aspect will record soil and groundwater
conditions in the test pits and collect bulk soil samples. Aspect will complete up to two grain size
analysis tests and two cation exchange capacity (CEC)tests on the bulk samples.
We assume the test pits will occur on the same day as the drill rig access clearing/grading with
Aspect on Site for one full day to observe and oversee both activities.
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Test pit logs, laboratory test results, and a site map showing the locations of the test pits will be
prepared and included in the geotechnical report.
Task C: Bridge Foundation and Stormwater Infiltration Rate Analysis and
Recommendations
Aspect will complete geotechnical engineering analyses and develop design and construction
recommendations for one preferred foundation system (i.e. shallow foundations, micropiles, etc.)
to support the bridge using the results of the machine drilled borings. Aspect will complete
analyses to correlate laboratory test data with hydraulic conductivity, and will report the local
groundwater level in each test pit. The results/recommendations will be presented in the
geotechnical report and will consist of:
• Summary of subsurface conditions (soil, bedrock and groundwater) at the bridge
foundations and near the stormwater infiltration trenches.
• Preferred pile foundation type (i.e. shallow foundations, micropiles)with corresponding
axial, uplift and lateral soil resistances (LPILE soil parameters and profile).
• Abutment and wingwall (concrete or mechanically stabilized earth (MSE)walls)vertical
and lateral design parameters, including structural fill gradation within MSE walls (if
any).
• Seismic design parameters and evaluation of seismic hazards.
• Earthwork and construction recommendations for the preferred pile type, abutment and
wing walls, and approach embankments.
• Global slope stability evaluation and consideration of creek bank slopes and approaches
at/around the bridge abutments that could affect foundations.
• Design infiltration rate and CEC values of on Site soils near the stormwater infiltration
trenches based on laboratory testing and correlations presented in the Stormwater
Management Manual for Eastern Washington.
Task D: Scour Analysis and Mitigation
Aspect will complete a scour analysis for pedestrian Bridge C with results and recommendations
presented under separate cover from the geotechnical report. The scour analysis will be
completed in accordance with FHWA guidelines (Hydraulic Engineering Circular No. 18
Evaluating Scour at Bridges Fifth Edition)using topographic survey provided by Perteet/City of
Yakima, the results of Aspect test pit, soil borings and laboratory analysis results, and H&H
modeling using HEC-RAS. The scour analysis will determine the scour depth to be used for
input to pile foundation lateral stability analysis and to assess the need for creek bank scour
mitigation at/near the bridge abutments.
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Aspect will develop written recommendations for scour mitigation at/near the bridge abutments.
We assume the project plans and specifications will be developed by others in the design team
and will incorporate our written recommendations.
Task E: No-Rise Analysis
Aspect will complete a no-rise analysis with results presented under separate cover from the
geotechnical report and scour analysis. The no-rise analysis will involve the following:
• Review agency comments, interact with Perteet and City, and revise Aspect's overall
Amendment 2 scope and fee estimate.
• Review City/County standards, effective/preliminary Flood Insurance Rate Maps
(FIRMs), and Flood Insurance Study (FIS).
• Determine no-rise criteria and base flood elevations.
• Obtain and review the FIS HEC-RAS model.
• Verify the HEC-RAS model matches the FIRMS.
• Perform additional hydraulic modeling to address agency comments. Utilize the existing
model to develop a proposed condition model by modifying the topography/cross
sections to reflect the proposed design. Modelling will occur in the vicinity of the areas of
concern identified by agency comments: (1)the proposed bridge crossing including the
proposed elevated trail surface near station 539+00— 541+00; and (2)the proposed
elevated trail surface near station 520+50— 523+00. Two proposed condition models will
be developed: (1)with skewed bridge piers; and (2)with non-skewed bridge piers.
• Run the proposed condition models and assess water surface elevations for any rise
compared to the existing condition model.
• If a water surface elevation rise is shown at either location, discuss potential mitigation
approaches with Perteet and City (up to two conference calls).
• Incorporate preferred mitigation approach for each of two locations of concern into the
proposed condition models, assess effectiveness of mitigation approaches, discuss results
with Perteet, and adjust mitigation approaches and rerun models as needed to achieve no-
rise.
• Develop a brief hydraulic analysis memo summarizing the no-rise analysis results.
Assumptions:
• We assume that project survey, plans, specifications, and existing condition HEC-RAS
model will be available to aid in the development of the proposed condition model.
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• If additional surveyed cross sections are needed, additional survey and review cost will
be required.
• It is assumed that no existing condition HEC-RAS model error corrections or other
updates to reflect existing conditions is needed.
• Only one local rise mitigation approach is modeled at each location, a hydraulic analysis
of multiple mitigation alternatives is not included. Any required mitigation design will be
developed by others on the design team.
• Effort to complete related permitting is not included (e.g., Grading& Excavation Permit,
Flood Hazard Permit, FEMA Elevation Certificate).
• Hydraulic Analysis Memo will be prepared as a final document, no review cycle.
Work Element 23-Bridge C Pile Foundation Analysis and Design (J-U-B)
J-U-B will provide deep foundation lateral analysis, pier lateral stability analysis, and bracing
detailing.
Optional Services (Excluded from this Scope of Services)
-Bridge 2a retrofit design.
-Environmental permitting (SEPA, NEPA, Shoreline, Critical Areas).
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2302 W.Dolarway Road,Suite 1,Ellensburg,WA 98926 P 425.252.7700
Exhibit"B"
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Aspect Consulting LLC 87,770 8,777 96,547
J 1I-B Engineers Inc, 1,640 164 1,604
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