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SUBJECT/TITLE:Agreement with Tetra Tech, Inc. for Big Soos Creek at
116th Ave SE Sediment Control Project
RECOMMENDED ACTION: Refer to Utilities Committee
DEPARTMENT: Public Works
STAFF CONTACT: Kevin Evans, Civil Engineer III
EXT.: 7264
The agreement for design services with Tetra Tech, Inc. is $298,671. The approved 2026 project
budget for the Big Soos Creek at 116th Ave SE Sediment Control project
(427.475614) is $500,000 and there is sufficient budget to fund this agreement.
Significant sedimentation has been observed in the Big Soos Creek channel from 116th Ave SE to
SE Petrovitsky Road, coupled with excessive vegetation growth and reduced conveyance
capacity of the channel that increases risk of flooding. The objective of the Big Soos Creek at
116th Ave SE Sediment Control project is to reduce sediment deposition in the channel to reduce
flood risk while considering the challenges associated with fish passage, private property, long-
term maintenance, and the proposed Soos Creek Watershed fine sediment Total Maximum
Daily Load limit (TMDL). This TMDL was submitted by Ecology to the EPA for approval on
December 30, 2025, and compels Renton and other jurisdictions within the watershed to
implement stormwater structural controls to reduce peak flows and fine sediment discharge to
Big Soos Creek. Additionally, Big Soos Creek extends through multiple private properties in this
reach which presents a challenge and limits sediment control opportunities to only the
public right-of-way.
Per city policy 250-02, the Surface Water Utility reviewed SOQs from 10 firms on the MRSC
Roster under the Civil Engineering Design category as part of a consultant selection process for
three projects. After scoring SOQs, and interviewing the four top scoring firms in August
2025, Tetra Tech, Inc. was selected as the most qualified firm to provide engineering design
services for this project.
To improve understanding of sedimentation patterns and rates in this reach, and to define future
capital projects that would reduce fine sediment discharge to Big Soos Creek, the
agreement proposed for execution covers the first phase of the project. The project will be
separated into three phases to allow for the scope of future phases to be based on the
results/success of previous phases. This first phase will include initial evaluation
City Council Regular Meeting
FISCAL IMPACT SUMMARY:
SUMMARY OF ACTION
2
and preliminary design.
Services required in this phase consist of project management, data collection and review,
preliminary survey, hydrologic evaluation, alternatives analysis, 30% design of stormwater
improvements along 116th Ave SE between SE 168th St and SE Petrovitsky Road,
and permit pathway review. Data collection and review will include publicly available GIS data,
as-built documentation, Soos Creek Fine Sediments TMDL, site reconnaissance,
and stormwater sampling. Hydrologic evaluation will include delineation of major tributary
basins, assessment of existing conditions, development of a continuous simulation using the
Western Washington Hydrology Model (WWHM), identification of sediment
accumulation “hotspot” locations, and development of a stormwater technical
memorandum. The WWHM model will represent hydrologic conditions with and without
conceptual design elements and will be used to compute water quality design flows, compute
peak flows by return period, and evaluate stormwater Low Impact Develoment(LID) Best
Management Practice (BMP) performance.
Future phases will likely include the final design of stormwater improvements, with possible
water quality design grant funding through the Department of Ecology Stormwater Financial
Assistance Program.
Authorize the Mayor and City Clerk to execute the Agreement with Tetra Tech, Inc. in the amount
of $298,671 for engineering services for Big Soos Creek at 116th Ave SE Sediment
Control Project Phase 1.
STAFF RECOMMENDATION
AGREEMENT FOR BIG SOOS CREEK AT 116TH AVE SE SEDIMENT
CONTROL
THIS AGREEMENT, dated for reference purposes only as January 1, 2026, is by and between the
City of Renton (the “City”), a Washington municipal corporation, and Tetra Tech, Inc.
(“Consultant”), a Washington corporation. The City and the Consultant are referred to collectively
in this Agreement as the “Parties.” Once fully executed by the Parties, this Agreement is effective
as of the last date signed by both parties.
1. Scope of Work: Consultant agrees to provide engineering services associated with
reducing sediment discharge to Big Soos Creek from 116th Ave SE to SE Petrovitsky Road,
as specified in Exhibit A, which is attached and incorporated herein and may hereinafter
be referred to as the “Work.”
2. Changes in Scope of Work: The City, without invalidating this Agreement, may order
changes to the Work consisting of additions, deletions or modifications. Any such changes
to the Work shall be ordered by the City in writing and the Compensation shall be
equitably adjusted consistent with the rates set forth in Exhibits B and C or as otherwise
mutually agreed by the Parties.
3. Time of Performance: Consultant shall commence performance of the Agreement
pursuant to the schedule(s) set forth in Exhibit A. All Work shall be performed by no later
than March 31, 2027.
4. Compensation:
A. Amount. Total compensation to Consultant for Work provided pursuant to this
Agreement shall not exceed $298,671, plus any applicable state and local sales taxes.
Compensation shall be paid based upon Work actually performed according to the
rate(s) or amounts specified in Exhibits B and C. The Consultant agrees that any hourly
or flat rate charged by it for its Work shall remain locked at the negotiated rate(s)
unless otherwise agreed to in writing or provided in Exhibits B and C. Except as
specifically provided herein, the Consultant shall be solely responsible for payment of
any taxes imposed as a result of the performance and payment of this Agreement.
B. Method of Payment. On a monthly or no less than quarterly basis during any quarter
in which Work is performed, the Consultant shall submit a voucher or invoice in a form
specified by the City, including a description of what Work has been performed, the
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name of the personnel performing such Work, and any hourly labor charge rate for
such personnel. The Consultant shall also submit a final bill upon completion of all
Work. Payment shall be made by the City for Work performed within thirty (30)
calendar days after receipt and approval by the appropriate City representative of the
voucher or invoice. If the Consultant’s performance does not meet the requirements
of this Agreement, the Consultant will correct or modify its performance to comply
with the Agreement. The City may withhold payment for work that does not meet the
requirements of this Agreement.
C. Effect of Payment. Payment for any part of the Work shall not constitute a waiver by
the City of any remedies it may have against the Consultant for failure of the
Consultant to perform the Work or for any breach of this Agreement by the
Consultant.
D. Non-Appropriation of Funds. If sufficient funds are not appropriated or allocated for
payment under this Agreement for any future fiscal period, the City shall not be
obligated to make payments for Work or amounts incurred after the end of the
current fiscal period, and this Agreement will terminate upon the completion of all
remaining Work for which funds are allocated. No penalty or expense shall accrue to
the City in the event this provision applies.
5. Termination:
A. The City reserves the right to terminate this Agreement at any time, with or without
cause by giving ten (10) calendar days’ notice to the Consultant in writing. In the event
of such termination or suspension, all finished or unfinished documents, data, studies,
worksheets, models and reports, or other material prepared by the Consultant
pursuant to this Agreement shall be submitted to the City, if any are required as part
of the Work.
B. In the event this Agreement is terminated by the City, the Consultant shall be entitled
to payment for all hours worked to the effective date of termination, less all payments
previously made. If the Agreement is terminated by the City after partial performance
of Work for which the agreed compensation is a fixed fee, the City shall pay the
Consultant an equitable share of the fixed fee. This provision shall not prevent the
City from seeking any legal remedies it may have for the violation or nonperformance
of any of the provisions of this Agreement and such charges due to the City shall be
deducted from the final payment due the Consultant. No payment shall be made by
the City for any expenses incurred or work done following the effective date of
termination unless authorized in advance in writing by the City.
6. Warranties And Right To Use Work Product: Consultant represents and warrants that
Consultant will perform all Work identified in this Agreement in a professional and
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workmanlike manner and in accordance with all reasonable and professional standards
and laws. Compliance with professional standards includes, as applicable, performing the
Work in compliance with applicable City standards or guidelines (e.g. design criteria and
Standard Plans for Road, Bridge and Municipal Construction). Professional engineers shall
certify engineering plans, specifications, plats, and reports, as applicable, pursuant to
RCW 18.43.070. Consultant further represents and warrants that all final work product
created for and delivered to the City pursuant to this Agreement shall be the original work
of the Consultant and free from any intellectual property encumbrance which would
restrict the City from using the work product. Consultant grants to the City a non-
exclusive, perpetual right and license to use, reproduce, distribute, adapt, modify, and
display all final work product produced pursuant to this Agreement. The City’s or other’s
adaptation, modification or use of the final work products other than for the purposes of
this Agreement shall be without liability to the Consultant. The provisions of this section
shall survive the expiration or termination of this Agreement.
7. Record Maintenance: The Consultant shall maintain accounts and records, which
properly reflect all direct and indirect costs expended and Work provided in the
performance of this Agreement and retain such records for as long as may be required by
applicable Washington State records retention laws, but in any event no less than six
years after the termination of this Agreement. The Consultant agrees to provide access
to and copies of any records related to this Agreement as required by the City to audit
expenditures and charges and/or to comply with the Washington State Public Records Act
(Chapter 42.56 RCW). The provisions of this section shall survive the expiration or
termination of this Agreement.
8. Public Records Compliance: To the full extent the City determines necessary to comply
with the Washington State Public Records Act, Consultant shall make a due diligent search
of all records in its possession or control relating to this Agreement and the Work,
including, but not limited to, e-mail, correspondence, notes, saved telephone messages,
recordings, photos, or drawings and provide them to the City for production. In the event
Consultant believes said records need to be protected from disclosure, it may, at
Consultant’s own expense, seek judicial protection. Consultant shall indemnify, defend,
and hold harmless the City for all costs, including attorneys’ fees, attendant to any claim
or litigation related to a Public Records Act request for which Consultant has responsive
records and for which Consultant has withheld records or information contained therein,
or not provided them to the City in a timely manner. Consultant shall produce for
distribution any and all records responsive to the Public Records Act request in a timely
manner, unless those records are protected by court order. The provisions of this section
shall survive the expiration or termination of this Agreement.
9. Independent Contractor Relationship:
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A. The Consultant is retained by the City only for the purposes and to the extent set forth
in this Agreement. The nature of the relationship between the Consultant and the City
during the period of the Work shall be that of an independent contractor, not
employee. The Consultant, not the City, shall have the power to control and direct the
details, manner or means of Work. Specifically, but not by means of limitation, the
Consultant shall have no obligation to work any particular hours or particular
schedule, unless otherwise indicated in the Scope of Work or where scheduling of
attendance or performance is mutually arranged due to the nature of the Work.
Consultant shall retain the right to designate the means of performing the Work
covered by this agreement, and the Consultant shall be entitled to employ other
workers at such compensation and such other conditions as it may deem proper,
provided, however, that any contract so made by the Consultant is to be paid by it
alone, and that employing such workers, it is acting individually and not as an agent
for the City.
B. The City shall not be responsible for withholding or otherwise deducting federal
income tax or Social Security or contributing to the State Industrial Insurance
Program, or otherwise assuming the duties of an employer with respect to Consultant
or any employee of the Consultant.
C. If the Consultant is a sole proprietorship or if this Agreement is with an individual, the
Consultant agrees to notify the City and complete any required form if the Consultant
retired under a State of Washington retirement system and agrees to indemnify any
losses the City may sustain through the Consultant’s failure to do so.
10. Hold Harmless: The Consultant agrees to release, indemnify, defend, and hold harmless
the City, elected officials, employees, officers, representatives, and volunteers from any
and all claims, demands, actions, suits, causes of action, arbitrations, mediations,
proceedings, judgments, awards, injuries, damages, liabilities, taxes, losses, fines, fees,
penalties, expenses, attorney’s or attorneys’ fees, costs, and/or litigation expenses to or
by any and all persons or entities, arising from, resulting from, or related to the negligent
acts, errors or omissions of the Consultant in its performance of this Agreement or a
breach of this Agreement by Consultant, except for that portion of the claims caused by
the City’s sole negligence.
Should a court of competent jurisdiction determine that this agreement is subject to RCW
4.24.115, (Validity of agreement to indemnify against liability for negligence relative to
construction, alteration, improvement, etc., of structure or improvement attached to real
estate…) 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, Consultant’s
liability shall be only to the extent of Consultant’s negligence.
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It is further specifically and expressly understood that the indemnification provided in
this Agreement constitute Consultant’s waiver of immunity under the Industrial
Insurance Act, RCW Title 51, solely for the purposes of this indemnification. The Parties
have mutually negotiated and agreed to this waiver. The provisions of this section shall
survive the expiration or termination of this Agreement.
11. Gifts and Conflicts: The City’s Code of Ethics and Washington State law prohibit City
employees from soliciting, accepting, or receiving any gift, gratuity or favor from any
person, firm or corporation involved in a contract or transaction. To ensure compliance
with the City’s Code of Ethics and state law, the Consultant shall not give a gift of any kind
to City employees or officials. Consultant also confirms that Consultant does not have a
business interest or a close family relationship with any City officer or employee who was,
is, or will be involved in selecting the Consultant, negotiating or administering this
Agreement, or evaluating the Consultant’s performance of the Work.
12. City of Renton Business License: Unless exempted by the Renton Municipal Code,
Consultant shall obtain a City of Renton Business License prior to performing any Work
and maintain the business license in good standing throughout the term of this
agreement with the City.
Information regarding acquiring a city business license can be found at:
https://www.rentonwa.gov/Tax
Information regarding State business licensing requirements can be found at:
https://dor.wa.gov/doing-business/register-my-business
13. Insurance: Consultant shall secure and maintain:
A. Commercial general liability insurance in the minimum amounts of $1,000,000 for
each occurrence/$2,000,000 aggregate for the Term of this Agreement.
B. In the event that Work delivered pursuant to this Agreement either directly or
indirectly involve or require Professional Services, Professional Liability, Errors and
Omissions coverage shall be provided with minimum limits of $1,000,000 per
occurrence. "Professional Services", for the purpose of this section, shall mean any
Work provided by a licensed professional or Work that requires a professional
standard of care.
C. Workers’ compensation coverage, as required by the Industrial Insurance laws of the
State of Washington, shall also be secured.
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D. Commercial Automobile Liability for owned, leased, hired or non-owned, leased, hired
or non-owned, with minimum limits of $1,000,000 per occurrence combined single
limit, if there will be any use of Consultant’s vehicles on the City’s Premises by or on
behalf of the City, beyond normal commutes.
E. Consultant shall name the City as an Additional Insured on its commercial general
liability policy on a non-contributory primary basis. The City’s insurance policies shall
not be a source for payment of any Consultant liability, nor shall the maintenance of
any insurance required by this Agreement be construed to limit the liability of
Consultant to the coverage provided by such insurance or otherwise limit the City’s
recourse to any remedy available at law or in equity.
F. Subject to the City’s review and acceptance, a certificate of insurance showing the
proper endorsements, shall be delivered to the City before performing the Work.
G. Consultant shall provide the City with written notice of any policy cancellation, within
two (2) business days of their receipt of such notice.
14. Delays: Consultant is not responsible for delays caused by factors beyond the
Consultant’s reasonable control. When such delays beyond the Consultant’s reasonable
control occur, the City agrees the Consultant is not responsible for damages, nor shall the
Consultant be deemed to be in default of the Agreement.
15. Successors and Assigns: Neither the City nor the Consultant shall assign, transfer or
encumber any rights, duties or interests accruing from this Agreement without the
written consent of the other.
16. Notices: Any notice required under this Agreement will be in writing, addressed to the
appropriate party at the address which appears below (as modified in writing from time
to time by such party), and given personally, by registered or certified mail, return receipt
requested, by facsimile or by nationally recognized overnight courier service. Time period
for notices shall be deemed to have commenced upon the date of receipt, EXCEPT
facsimile delivery will be deemed to have commenced on the first business day following
transmission. Email and telephone may be used for purposes of administering the
Agreement, but should not be used to give any formal notice required by the Agreement.
CITY OF RENTON
Kevin Evans
1055 South Grady Way
Renton, WA 98057
Phone: (425) 430-7264
CONSULTANT
Alex Buescher
1750 South Harbor Way, Suite #400
Portland, OR 97201
Phone: (503) 727-8069
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krevans@rentonwa.gov
alex.buescher@tetratech.com
17. Discrimination Prohibited: Except to the extent permitted by a bona fide occupational
qualification, the Consultant agrees as follows:
A. Consultant, and Consultant’s agents, employees, representatives, and volunteers
with regard to the Work performed or to be performed under this Agreement, shall
not discriminate on the basis of race, color, sex, religion, nationality, creed, marital
status, sexual orientation or preference, age (except minimum age and retirement
provisions), honorably discharged veteran or military status, or the presence of any
sensory, mental or physical handicap, unless based upon a bona fide occupational
qualification in relationship to hiring and employment, in employment or application
for employment, the administration of the delivery of Work or any other benefits
under this Agreement, or procurement of materials or supplies.
B. The Consultant will take affirmative action to insure that applicants are employed and
that employees are treated during employment without regard to their race, creed,
color, national origin, sex, age, sexual orientation, physical, sensory or mental
handicaps, or marital status. Such action shall include, but not be limited to the
following employment, upgrading, demotion or transfer, recruitment or recruitment
advertising, layoff or termination, rates of pay or other forms of compensation and
selection for training.
C. If the Consultant fails to comply with any of this Agreement’s non-discrimination
provisions, the City shall have the right, at its option, to cancel the Agreement in
whole or in part.
D. The Consultant is responsible to be aware of and in compliance with all federal, state
and local laws and regulations that may affect the satisfactory completion of the
project, which includes but is not limited to fair labor laws, worker's compensation,
and Title VI of the Federal Civil Rights Act of 1964, and will comply with City of Renton
Council Resolution Number 4085.
18. Miscellaneous: The parties hereby acknowledge:
A. The City is not responsible to train or provide training for Consultant.
B. Consultant will not be reimbursed for job related expenses except to the extent
specifically agreed within the attached exhibits.
C. Consultant shall furnish all tools and/or materials necessary to perform the Work
except to the extent specifically agreed within the attached exhibits.
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D. In the event special training, licensing, or certification is required for Consultant to
provide Work he/she will acquire or maintain such at his/her own expense and, if
Consultant employs, sub-contracts, or otherwise assigns the responsibility to perform
the Work, said employee/sub-contractor/assignee will acquire and or maintain such
training, licensing, or certification.
E. This is a non-exclusive agreement and Consultant is free to provide his/her Work to
other entities, so long as there is no interruption or interference with the provision of
Work called for in this Agreement.
F. Consultant is responsible for his/her own insurance, including, but not limited to
health insurance.
G. Consultant is responsible for his/her own Worker’s Compensation coverage as well as
that for any persons employed by the Consultant.
19. Other Provisions:
A. Approval Authority. Each individual executing this Agreement on behalf of the City
and Consultant represents and warrants that such individuals are duly authorized to
execute and deliver this Agreement on behalf of the City or Consultant.
B. General Administration and Management. The City’s project manager is Kevin Evans.
In providing Work, Consultant shall coordinate with the City’s contract manager or
his/her designee.
C. Amendment and Modification. This Agreement may be amended only by an
instrument in writing, duly executed by both Parties.
D. Conflicts. In the event of any inconsistencies between Consultant proposals and this
Agreement, the terms of this Agreement shall prevail. Any exhibits/attachments to
this Agreement are incorporated by reference only to the extent of the purpose for
which they are referenced within this Agreement. To the extent a Consultant
prepared exhibit conflicts with the terms in the body of this Agreement or contains
terms that are extraneous to the purpose for which it is referenced, the terms in the
body of this Agreement shall prevail and the extraneous terms shall not be
incorporated herein.
E. Governing Law. This Agreement shall be made in and shall be governed by and
interpreted in accordance with the laws of the State of Washington and the City of
Renton. Consultant and all of the Consultant’s employees shall perform the Work in
accordance with all applicable federal, state, county and city laws, codes and
ordinances.
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F. Joint Drafting Effort. This Agreement shall be considered for all purposes as prepared
by the joint efforts of the Parties and shall not be construed against one party or the
other as a result of the preparation, substitution, submission or other event of
negotiation, drafting or execution.
G. Jurisdiction and Venue. Any lawsuit or legal action brought by any party to enforce or
interpret this Agreement or any of its terms or covenants shall be brought in the King
County Superior Court for the State of Washington at the Maleng Regional Justice
Center in Kent, King County, Washington, or its replacement or successor. Consultant
hereby expressly consents to the personal and exclusive jurisdiction and venue of
such court even if Consultant is a foreign corporation not registered with the State of
Washington.
H. Severability. A court of competent jurisdiction’s determination that any provision or
part of this Agreement is illegal or unenforceable shall not cancel or invalidate the
remainder of this Agreement, which shall remain in full force and effect.
I. Sole and Entire Agreement. This Agreement contains the entire agreement of the
Parties and any representations or understandings, whether oral or written, not
incorporated are excluded.
J. Time is of the Essence. Time is of the essence of this Agreement and each and all of
its provisions in which performance is a factor. Adherence to completion dates set
forth in the description of the Work is essential to the Consultant’s performance of
this Agreement.
K. Third-Party Beneficiaries. Nothing in this Agreement is intended to, nor shall be
construed to give any rights or benefits in the Agreement to anyone other than the
Parties, and all duties and responsibilities undertaken pursuant to this Agreement will
be for the sole and exclusive benefit of the Parties and no one else.
L. Binding Effect. The Parties each bind themselves, their partners, successors, assigns,
and legal representatives to the other party to this Agreement, and to the partners,
successors, assigns, and legal representatives of such other party with respect to all
covenants of the Agreement.
M. Waivers. All waivers shall be in writing and signed by the waiving party. Either party’s
failure to enforce any provision of this Agreement shall not be a waiver and shall not
prevent either the City or Consultant from enforcing that provision or any other
provision of this Agreement in the future. Waiver of breach of any provision of this
Agreement shall not be deemed to be a waiver of any prior or subsequent breach
unless it is expressly waived in writing.
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N. Counterparts. The Parties may execute this Agreement in any number of
counterparts, each of which shall constitute an original, and all of which will together
constitute this one Agreement.
IN WITNESS WHEREOF, the Parties have voluntarily entered into this Agreement as of the date
last signed by the Parties below.
CITY OF RENTON
By:_____________________________
CONSULTANT
By:____________________________
Armondo Pavone
Mayor
Chuck Purnell
Senior Project Manager
_____________________________
Date
_____________________________
Date
Attest
_____________________________
Jason A. Seth
City Clerk
Approved as to Legal Form
By: __________________________
Shane Moloney
Renton City Attorney
Contract Template Updated 5/21/2021
116th Avenue Southeast Stormwater Improvements Page 1 of 18
CITY OF RENTON PUBLIC WORKS
SCOPE OF WORK
BIG SOOS CREEK AT 116TH AVE SE SEDIMENT CONTROL
BACKGROUND
The City of Renton (City) contains within its municipal boundary the headwaters for Big Soos Creek and
several tributary streams. Big Soos Creek is identified by the City as a “Type F” fish-bearing stream, and
several species of salmon, including Chinook, Coho, Chum, and Steelhead, spawn and rear in the Soos
Creek watershed.
Additionally, the Washington Department of Ecology is also reviewing two different Total Maximum Daily
Load (TMDL) limitations on the Soos Creek Watershed: the first is a multi-parameter TMDL that will regulate
temperature, dissolved oxygen, and bacteria, and the second TMDL will be specific to fine sediments. The
City considers the implementation of these TMDLs to be an eventuality and seeks to prepare itself to
manage its portion of the watershed accordingly.
The City has identified a conveyance capacity issue in Big Soos Creek between 116th Avenue Southeast
and Southeast Petrovitsky Road. Excess sedimentation in the channel and overgrown vegetation flanking
the channel banks have reduced the conveyance capacity of the channel, and the channel’s location
primarily on private property presents a challenge for regular maintenance activities. To find a resolution to
the reduced conveyance capacity in a manner that considers the challenges associated with fish passage,
water quality, private property, and long-term maintenance considerations, the City has hired Tetra Tech,
Inc. (Consultant) to conduct an alternatives analysis and perform the subsequent design of stormwater
management Best Management Practices (BMPs) targeted at improving several key goals:
• Improve the channel’s flow conveyance capacity of Big Soos Creek in the project area.
• Reduce the City’s long-term maintenance burden in the project area.
• Augment the City’s permit management through identification of requirements associated with the
future TMDLs, potentially including site-specific data collection, subwatershed modeling, and
implementation of stormwater best management practices (BMPs).
This scope of work presents the work to accomplish the City’s goals in three (3) phases. The first phase of
work is the subject of this contract, while the latter phases may be included in a future contract amendment,
at the City’s discretion.
• Phase 1 – Initial Evaluation and Conclusions, 30% Design
• Phase 2 – Design and Permit Support (Future Amendment)
• Phase 3 – Bid Support and Services During Construction (Future Amendment)
116th Avenue Southeast Stormwater Improvements Page 2 of 18
SERVICES – PHASE 1: INITIAL EVALUATION AND CONCLUSIONS
DURATION
Phase 1 of this contract assumes a duration of 15 months, beginning on January 1st, 2026 and ending on
March 31st, 2027.
TASK 1.1 – PROJECT MANAGEMENT
The focus of this task is to maintain effective communication with the City’s Project Manager and City
staff, manage the project budget, and coordinate the timing of all tasks within this scope to ensure
completion within the project schedule.
1. Prepare project plan defining staff responsibilities and schedules.
2. Conduct an internal project start-up meeting involving key team members at Tetra Tech offices.
3. Conduct a kickoff meeting with the City. Tetra Tech will take note of action items and confirm these
items with the City via email.
4. Conduct up to 15 monthly check-in meetings, each up to 1 hour in duration, with the City.
5. The Consultant will provide to the City a Phase 1 project schedule within two (2) weeks of The
Consultant receiving the notice to proceed. The schedule will show milestone dates and submittal
dates to the City. The design schedule will be updated monthly over the project duration.
6. Ongoing project management and coordination with the project team, including subconsultants.
Management functions including coordinating labor, meeting key scheduling milestones, and
maintaining budget occurs within this task.
7. Preparation of 15 monthly progress reports which include a summary table comparing amount
expended and remaining budget. Progress reports will identify any anticipated or current issues
with any out-of-scope work, budget shortfalls, and provide suggested corrections.
8. Prepare a Project Management Plan (PMP) describing the procedures and protocol for execution
of the various components of the work, organizational chart of the Consultant team and City staff,
project team roles and responsibilities, internal and external communications plan, routing
procedures for all project correspondence and deliverables, risk management plan, and quality
assurance plan. Quality assurance plan documentation associated with this project.
Assumptions
1. The kickoff meeting will be attended by up to two (2) Tetra Tech staff (which includes the project
manager). The meeting will last up to two (2) hours. Tetra Tech will facilitate the meeting, prepare
the meeting agenda, and prepare meeting notes.
2. The Consultant will prepare agendas and notes for the project kickoff meeting and check-in
meetings.
3. Meetings will be held via Microsoft Teams or other digital meeting platform unless otherwise agreed
upon by both the Consultant and the City or otherwise specified in the Scope of Work.
116th Avenue Southeast Stormwater Improvements Page 3 of 18
Deliverables
1. Kickoff meeting and monthly check-in meeting notes.
2. Project Management Plan and project schedule, delivered electronically as a PDF document.
3. Monthly updates to the design schedule.
4. Monthly invoices and progress reports, delivered electronically as emails with invoices.
5. Subconsultant agreements, as applicable.
6. QA/QC documentation upon request.
TASK 1.2 – DATA COLLECTION AND REVIEW
The Consultant will collect and review existing data to support project analysis and design. The primary
goal of this task is to synthesize existing data relevant to the project to inform the work conducted in other
project tasks. This task will also identify data gaps where further investigation or data collection is
necessary. The Consultant’s work will include the following:
Subtask 1.2.1 – Review of Existing Publicly-Available Data
1. Review and obtain publicly available Geographic Information System (GIS) data and City of Renton
Maps (CORMAPS) web portal.
a. Existing utilities (e.g., storm sewer, sanitary sewer, water main, dry utilities, overhead
utilities, etc.).
b. Existing topography (e.g., LiDAR datasets)
c. Review of City Operations and Maintenance documentation, especially pertaining to
maintenance of culverts along Big Soos Creek, vegetation management in Big Soos Creek,
and operational practices related to street sweeping and winter ice control.
d. Environmental data (e.g., critical areas, priority habitats and species, soils, etc.).
2. Obtain and review available as-built documentation pertaining to:
a. The public right-of-way, including the roadways, culverts, and utilities.
b. Private developments that contain project elements such as the stormwater conveyance
networks, Big Soos Creek, or stormwater detention systems (both publicly and privately
owned).
3. Obtain and review documents related to the Soos Creek Fine Sediments TMDL (where available),
including:
a. The Water Quality Improvement Report and Implementation Plan
b. HSPF model
c. Sediment data used for model calibration
4. Identify data gaps, assess whether those gaps should be filled, and propose methods of addressing
such data gaps.
Subtask 1.2.2 – Site Reconnaissance and Sampling
1. Conduct site reconnaissance visits for the following:
a. One (1) site visit for an initial review of the project drainage features, tributary basins,
wetlands, and other critical areas in the project vicinity.
116th Avenue Southeast Stormwater Improvements Page 4 of 18
2. Conduct stormwater sampling to measure flow and Total Suspended Solids (TSS) at select
locations. Stormwater sampling will be conducted via sampling probes at each sample location.
a. Stormwater sampling will be conducted using data logger probes or meters. TSS sampling
will be conducted using a turbidity probe and will be calibrated to compute TSS
concentrations based on 1 grab sample for each sampling location.
b. Sampling locations will include:
i. Outfall #OUT-847 (per CORMAPS) to Big Soos Creek on west side of 116th Ave
SE.
ii. Catch Basin #135572 (per CORMAPS), located on the east side of 116th Ave SE
at Big Soos Creek.
iii. Outfall #OUT-0002 (per CORMAPS), located on the south side of SE 168th St at
Big Soos Creek.
c. Two (2) Consultant staff will visit the sampling locations a total of two (2) times to collect
grab samples for TSS calibration, to monitor the installation and removal the turbidity
probes by the equipment vendor, and to collect the data from the sampling equipment.
Assumptions
1. Tetra Tech shall be entitled to rely upon any information, data and documentation concerning the
Project provided to it by the City or other parties, obtained from the City’s GIS database, or that is
generally available, as well as any statements and representations made by the City concerning
the Project or the Services. In relying on such information, Tetra Tech shall have no obligation to
investigate or independently verify the accuracy, timeliness, or completeness of such information.
2. The City will provide the Consultant with GIS data (shapefiles, geotiffs, etc.) from CORMAPS upon
request by the Consultant.
3. The City will secure Rights-of-Entry where access to private property is necessary. Work on private
property will not be performed without Rights-of-Entry.
4. Traffic control measures will not be necessary to support Consultant field work activities. The
Consultant will exercise professional judgement regarding site safety, and will not perform field
work activities at a site deemed to be unsafe.
5. The Consultant will not need special certifications, such as OSHA Confined Space, to conduct the
field work activities.
6. The City will review draft deliverables and provide a single set of review comments and edits.
Conflicting and ambiguous comments between City reviewers will be resolved prior to submitting
to the Consultant.
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Deliverables
1. A draft and final technical memorandum summarizing the results of the data review, submitted
electronically as a Portable Document Format (PDF). The memorandum will also document data
gaps and potential collection activities.
2. Sampling summaries, including raw data, field logs, and computations.
TASK 1.3 – PRELIMINARY SURVEY
The Consultant will provide topographical data collection to support the Phase 1 analysis and design effort.
Boundary line surveys, bathymetric surveys, and storm sewer inventory surveys are not included in the
Phase 1 scope, but are anticipated for Phase 2 (design), depending on the results of the Phase 1
alternatives analysis. The approach will involve a mobile mapping system comprised of lidar and imagery
sensors to support the planning and analysis activities associated with Phase 1 by providing the Consultant
a desktop accessible lidar and panoramic imagery set. The advantage of using this approach means data
will be collected at the posted speeds of the roadways that will not impede traffic or create any lane closures.
The Consultant’s work will include the following:
Establish survey control for the project that will be used for data collection and planimetric data
extraction efforts. This work includes the setting of six (6) survey control / mobile mapping targets.
The Consultant will use Trimble GNSS/GPS and conventional survey methods to establish the
control values:
a. The Consultant will establish on-site survey control that will be used as the basis of this
project. Control will be derived from Washington State Reference Network, NAD83 (2011),
and NAVD88 datums, based upon Washington State Plane Coordinate System – North.
b. The set of control targets will consist of a 2’x2’ square painted white, with a mag nail set in
the center of the square.
c. The Consultant will use Trimble GNSS to establish coordinate values on each of the six
(6) designated control points.
d. The Consultant will use Trimble DiNi digital level to establish elevations across the control
points.
e. Units shall be the International Foot as established in 58.20.185 RCW.
2. Perform field surveying. The Consultant will use vehicle-mounted terrestrial lidar and imagery to
scan public right-of-way corridors within the area shown in Figure 1. Panoramic imagery will be
collected in 15-foot intervals traveling down the roadway. The right-of-way corridors to be scanned
may include, but are not limited to:
Priority Corridors:
a. 116th Avenue Southeast
b. 117th Avenue Southeast
c. 118th Avenue Southeast
d. Southeast 168th Street
e. Southeast 170th Street
f. Southeast Petrovitsky Road
Secondary Corridors:
a. 113th Avenue Southeast
b. 114th Avenue Southeast
c. 114th Lane Southeast
d. 120th Avenue Southeast
e. Southeast 169th Street
f. Southeast 171st Street
g. Southeast 171st Place
h. Southeast 175th Street
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3. Perform office processing and raw lidar data extraction. The Consultant will post process the
datasets to the survey control to produce georeferenced lidar and imagery datasets.
4. Extract survey data to develop survey basemap to support 30% design (Task 1.6).
a. Perform office processing and data extraction to develop a survey basemap. The survey
basemap will include typical road features such as the road crown, gutter lines, flow lines,
curb top and back, back of sidewalk, etc. The survey basemap will also include road paint
lines and above ground appurtenances such as junction boxes, utility poles, and street
signs, and building corners where a line-of-sight from the roadway exists.
b. Perform office processing and data extraction to develop a 3D terrain model. The 3D terrain
model will be supplemented with 2021 King County LiDAR terrain.
c. Integrate City GIS data obtained under Task 1.2 into the survey basemap. Such data may
include underground utilities, overhead utilities, and critical areas mapping.
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Figure 1. Approximate Mobile Scanning Area
116th Avenue Southeast Stormwater Improvements Page 8 of 18
Assumptions
1. Field surveying efforts are limited to one (1) day of data collection. Priority corridors will be surveyed
before secondary corridors. It is possible that not all corridors will be surveyed during the one day
of data collection.
2. The City will review draft deliverables and provide a single set of review comments and edits.
Conflicting and ambiguous comments between City reviewers will be resolved prior to submitting
to the Consultant.
3. Boundary line surveys will occur under Phase 2 once an alternative for design has been selected.
4. Health, safety, and security are the priority. The Consultant will not proceed if conditions are
deemed unhealthy, unsafe, or not secure from harm of any type. Where unsafe conditions are
found, the Consultant will notify the City to resolve them.
5. The Consultant is not responsible for any delays due to conditions outside of the Consultant’s
control.
6. Permits will not be required for the Consultant’s efforts. The City will provide access to the survey
area and will acquire all necessary right-of-entry access.
7. GIS from the City for utilities and/or other information will be provided to the Consultant or obtained
by the Consultant from public sources. The Consultant will reasonably rely on data provided by the
City and will have no obligation to investigate or independently verify the accuracy or completeness
of such information
8. Underground Conductible Utility Locates and Surveying are not part of this scope except as noted.
9. Confined space entry will not be required.
10. Traffic control will not be required.
11. The Consultant will provide the City with three (3) days’ advance notice for being on site to perform
the survey. The Consultant will only proceed after receiving written (email) authorization from the
City.
12. Survey basemap for 30% design will be approximate and will not utilize surveyed control. Title
reports will not be reviewed at this stage. Right-of-way lines, property lines, encumbrances (such
as easements) will not be resolved at this stage.
13. The survey basemap developed to support the 30% design task assumes that the basemap will be
developed exclusively along 116th Avenue Southeast between Southeast 168th Street and
Southeast Petrovisky Road. Basemap development on other roads or within private property are
excluded from this scope of work unless the contract is amended accordingly.
14. A 3D laser scanner that’s used in mobile mapping is a line-of-sight optical instrument. It is possible
that some objects closer to the scanner will block it from scanning other objects further away, and
therefore, these objects or areas may not be shown in the point cloud and may be omitted in our
deliverables. Other sources of error can be caused due to site accessibility, onsite interferences
and obscurities, or areas with high or low reflectivity or refractivity (e.g., glass, stainless steel, high
gloss paints, wet or dark surfaces). Our experience in scanning will help us reduce the data lost for
these reasons, but omissions are always a possibility, depending on the real conditions at the time
the scans are collected. Examples of potential obstructions given the nature of this site may include,
but are not limited to, parked and moving vehicles, bridge decks and rails, brush, trees, pedestrians,
tall grasses, low hanging canopy, buildings, barriers, etc.
116th Avenue Southeast Stormwater Improvements Page 9 of 18
15. 3D modeling is necessarily less accurate than the point cloud. Models do not connect every point
collected by our scanners, and thus, true as-built information is omitted. Also, best-fit curves, truly
vertical/horizontal line work, and modeling families may be used to reduce the scope and expense
of the project, which will only approximate the location of certain features. For example, walls,
ceilings, and floors could be modeled as one planar surface, losing natural bowing or differences
in angles to other features. Similarly, deflections and bowing in piping runs may not be shown in
the model. Although the typical accuracy of the model is within approximately one-half to one inch
(½”-1”), these limitations could cause features to be modeled with much less accurately or omitted
altogether in certain areas.
16. Every reasonable effort will be made by the Consultant to complete this survey in the time
requested. However, if adverse conditions (such as major scope changes, delays in receiving title
documents or right-of-way plans, or restricted access to adjacent parcels) are found to exist, then
the time of delivery may be exceeded.
17. It is assumed that free and unencumbered access will be granted to the Consultant during the
duration of this survey.
18. Health, Safety, and Security are priorities. The Consultant will not proceed if the conditions are
deemed unhealthy, unsafe, or not secure from harm of any type.
19. Survey control will be prepared under the supervision and seal of a professional land surveyor
licensed in the State of Washington.
Deliverables
1. Access to online data viewing portal, where the City will be able to view the point cloud data and
street view imagery.
2. Survey Basemap, as Autodesk Civil 3D DWG file, compatible with Civil 3D version 2018 and newer.
The file will be georeferenced to the NAD83 (2011) horizontal datum.
3. 3D terrain model, as GIS raster file and as Autodesk Civil 3D DWG file.
4. List of six (6) control point coordinates in .CSV (PNEZD) format.
116th Avenue Southeast Stormwater Improvements Page 10 of 18
TASK 1.4 – HYDROLOGIC EVALUATION
The Consultant will provide a hydrologic evaluation of existing conditions to support the development and
evaluation of conceptual designs. The Consultant will provide the following services:
1. Delineate major tributary basins to key locations:
a. Up to nine (9) stormwater outfalls to Big Soos Creek between SE 168th Street and 116th
Ave SE.
b. 116th Ave SE at Big Soos Creek (North, South, and West)
c. 117th Ave SE at Big Soos Creek (North, South, and West)
d. 118th Ave SE at Big Soos Creek (North, South, and West)
e. Outfall #OUT-0163, located on the south side of SE Petrovitsky Road at Big Soos Creek.
2. Assess existing conditions of the drainage basin to determine inputs for the hydrologic model.
3. Develop a continuous simulation hydrologic model using the Western Washington Hydrology Model
(WWHM) for the drainage basin that will be used to compute Water Quality Design Flows, compute
peak flows by return period, perform stream simulation analysis, and evaluate LID BMP
performance. The model will represent the following:
a. Existing hydrologic conditions, including attenuation of runoff due to engineered or naturally
occurring ponds, lakes, or other detention facilities.
b. Existing hydrologic conditions as A above and including conceptual design elements for
project alternatives.
c. Existing hydrologic conditions without engineered mitigation measures to ensure that
runoff estimates are sufficiently conservative.
d. Existing hydrologic conditions as C above and including conceptual design elements for
project alternatives.
4. Review basins, drainage network, and maintenance practices to identify expected “hotspot”
locations where sediment accumulation is expected to occur.
5. Develop a Stormwater Technical Memorandum documenting the methodology and findings of the
above work items.
Assumptions
1. WWHM is appropriate for the project study area. The WWHM has been vetted and is approved for
use in City of Renton Surface Water Design Manual. Tetra Tech will not be responsible for
calibrating or validating the model.
2. Hydrologic model soil inputs will be determined via the NRCS Soil Survey. Hydrologic model slope
inputs will be derived from LiDAR topographic data as defined in Task 1.3.
3. The analysis of stormwater treatment BMPs will follow the methodologies documented in the City’s
Surface Water Design Manual, in WA Ecology’s Stormwater Management Manual for Western
Washington, and WA Ecology’s General Use Level Designation for emerging technologies, as
applicable.
Deliverables
1. Draft and Final Stormwater Technical Memorandum, delivered electronically as a PDF.
116th Avenue Southeast Stormwater Improvements Page 11 of 18
2. Modeling files upon request.
TASK 1.5 – ALTERNATIVES ANALYSIS
The Consultant will identify a range of potential options for conceptual design and participate in a workshop
with the City to discuss design concepts that meet project goals. The Consultant will develop project
alternatives and complete an evaluation of the alternatives. The Consultant will provide the following
services:
1. Develop screening criteria to be used for development and evaluation of alternatives. Record
information in the form of an evaluation matrix table. Screening criteria will be developed with input
from the City and may include the following:
a. Design complexity and constructability.
b. Permit complexity.
c. Implementation cost and schedule.
d. Regulatory issues and constraints.
e. Project risk and design resiliency and uncertainty.
f. Maintenance and operations complexity and cost, including lifecycle cost.
g. Property interests, public relations, and neighborhood impacts.
h. Agency preferences.
2. Identify a range of potential design options and develop project concept design alternatives.
Options may include a distributed network of small BMPs, one or more regional facilities, or a
combination of the two. The options will also consider constraining BMPs to new BMPs within the
City right-of-way along with acquiring existing, privately owned BMPs for public use. Lastly, the
options will include the no-action alternative as a baseline for comparison. Up to four (4) distinct
project alternatives, including the no-action alternative, will be developed.
3. Review likely permit pathways and durations for each alternative and document in a permitting
matrix.
4. Prepare preliminary graphical representations of each alternative, including a site plan and location
map. Graphical representations will be developed as hand sketches (either via pen/paper or via
PDF annotations) or GIS shapefiles.
5. Prepare planning-level cost estimations for each alternative. Costs will be developed sufficiently
such that the cost estimate reflects anticipated actual construction costs with a construction
contingency to be determined by agreement between the Consultant and the City.
6. Lead one (1) two-hour (2 hour) virtual workshop with the City to review the alternatives, evaluation
criteria, and alternative ranking. A preferred alternative will be selected during this workshop.
7. Develop an Alternatives Analysis Technical Memorandum, including graphics, summarizing the
methods and outcomes of the alternatives development process, detailed descriptions of the
alternatives, evaluation of design issues, intended function, and probable construction costs. The
memorandum will also identify technical data gaps and additional technical studies and summarize
outstanding data needs.
Assumptions
1. The Consultant will facilitate the virtual workshop via Microsoft Teams. The Consultant will prepare
the agenda for and take notes at the virtual workshop meeting and alternative development
technical workshop.
116th Avenue Southeast Stormwater Improvements Page 12 of 18
2. The City will review draft deliverables and provide a single set of review comments and edits.
Conflicting and ambiguous comments between City reviewers will be resolved prior to submitting
to the Consultant.
3. In providing opinions of cost, financial analyses, economic feasibility projections, for the project,
Tetra Tech has no control over cost or price of labor and materials; unknown or latent conditions of
existing equipment or structures that may affect operation or maintenance costs; competitive
bidding procedures and market conditions; time or quality of performance by operating personnel
or third parties; and other economic and operational factors that may materially affect the ultimate
project cost or schedule. Therefore, Tetra Tech makes no warranty that Client's actual project costs,
financial aspects, economic feasibility, will not vary from Tetra Tech’s opinions, analyses,
projections, or estimates.
Deliverables
1. A draft exhibit of each concept alternative, delivered electronically as PDF documents.
2. Meeting notes for the virtual workshop, delivered electronically as an email.
3. Draft and Final Alternatives Technical Memorandum.
TASK 1.6 – THIRTY PERCENT (30%) DESIGN OF 116TH AVENUE SOUTHEAST
STORMWATER IMPROVEMENTS
The Consultant will prepare 30% design engineering plans and an estimate of probable cost for the 116th
Avenue Southeast Stormwater improvements using accepted engineering practices and City of Renton
engineering guidance and standards. The drawing list is described in Table 1. Plan set scales will be
selected based on using full size drawings for construction (22-inch by 34-inch paper). The Consultant will
submit a 30% design package to the City for initial review and comment and will incorporate City comments
into the 60% design package under a future contract amendment.
Work elements for this task include:
1. Prepare 30% design plans representing the Type, Size, and Location (TS&L) of the preferred
design alternative, stormwater conveyance profiles, and typical Water Quality BMP details.
2. Prepare a 30% estimate of construction cost.
3. Identify utility conflicts and potential utility conflicts.
4. Identify areas where temporary easements, permanent easements, or right-of-way acquisition will
be necessary to accomplish the project.
5. Identify up to three (3) variances to City of Renton design standards necessary to accomplish the
project.
116th Avenue Southeast Stormwater Improvements Page 13 of 18
Table 1. Preliminary Drawing Sheet List
SHEET NAME SCALE
NO. OF SHEETS
30% DESIGN
ANTICIPATED
FUTURE DESIGNA
(NOT INCLUDED IN THIS
CONTRACT)
Cover Sheet and Sheet Index 1 1
Legend and Abbreviations 1 1
General Notes 1 1
Existing Conditions (Basemap) 1” = 100’ 1 1
Construction Access Plan 1” = 100’ - 1
Site Preparation and TESC Plan 1” = 20’ - 3
Site Preparation and TESC Details - 1
Stormwater Drainage Plan and Profile 1” = 20’ 6 6
Stormwater Quality BMP – Typical Details 1 1
Stormwater Quality BMP – Grading Details - 5B
Standard Details - 3
Traffic Control Plan and Details 1” = 1000’ - 1
Total 11 25
A60%, 90%, 100%, and Final Design efforts will occur under a future amendment to this contract.
BActual quantity of BMPs is unknown. Number of sheets is assumed.
Assumptions
1. The 30% design task assumes that the preferred alternative identified in Task 1.7 will be a network
of distributed stormwater BMPs exclusively along 116th Avenue Southeast between Southeast
168th Street and Southeast Petrovisky Road. Distributed stormwater treatment facilities on other
roads or within private property, and regional facilities, are excluded from this scope of work unless
the contract is amended accordingly.
2. All stormwater BMPs will are assumed to meet the following criteria:
o Filter cartridge technology certified for General Use Level Designation (GULD) for Basic
treatment by the Washington State Department of Ecology.
o Separate infiltration and/or facilities will not be used.
o All stormwater BMPs will be “off-the-shelf” designs; no custom configurations or special
detailing will be necessary.
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3. Construction specifications according to WSDOT Standard Specifications for Road, Bridge, and
Municipal Construction, 2026 Edition, or most current edition.
4. Standard drainage details according to, in order of priority, (1) City of Renton Standard Details and
(2) WSDOT Standard Plans.
5. Stormwater infrastructure designed according to, in order of priority, (1) the City of Renton 2022
Surface Water Design Manual (SWDM) and (2) the Washington State Department of Ecology
(Ecology) 2024 Stormwater Management Manual for Western Washington (SWMMWW).
6. Design submittals will be prepared using Autodesk Civil 3D 2025 or other version compatible with
the 2018 (current) DWG filetype.
7. The City will provide the Consultant with documentation of City CAD standards, Civil 3D template
files, title blocks, logos, and other CAD documents conforming to City standards.
8. Project data will be expressed relative to the Washington State Plane (North Zone) NAD83
horizontal coordinate system and the NAVD88 vertical datum.
9. The City will review draft deliverables and provide a single set of review comments and edits.
Conflicting and ambiguous comments between City reviewers will be resolved prior to submitting
to the Consultant.
10. In providing opinions of cost, financial analyses, economic feasibility projections, for the project,
Tetra Tech has no control over cost or price of labor and materials; unknown or latent conditions of
existing equipment or structures that may affect operation or maintenance costs; competitive
bidding procedures and market conditions; time or quality of performance by operating personnel
or third parties; and other economic and operational factors that may materially affect the ultimate
project cost or schedule. Therefore, Tetra Tech makes no warranty that Client's actual project costs,
financial aspects, economic feasibility, will not vary from Tetra Tech’s opinions, analyses,
projections, or estimates.
Deliverables
1. 30% Plans, delivered electronically as a PDF.
2. 30% Cost Estimate, delivered electronically as a PDF.
3. List of utility conflicts, including corresponding plan set sheet number, delivered electronically as a
MS Word document.
4. Location and size (in square feet) of each easement or right-of-way acquisition, delivered
electronically as a MS Excel document.
5. List of variances to City of Renton design standards, delivered electronically as a MS Word
document.
TASK 1.7 – PERMIT PATHWAY REVIEW
Following the completion of Task 1.7 and the selection of a preferred alternative, the Consultant will review
necessary and/or anticipated permit requirements for the project design and will incorporate the permit
requirements into the project design constraints. The preparation of permit application materials will occur
under a future amendment to this contract. The Consultant will provide the following services:
1. Coordinate with the City to identify local permits that are applicable to this project.
2. Conduct one (1) pre-application or informational meeting with City permitting department to review
the project, confirm permitting approach and design requirements, and identify additional permits
and beneficial permitting strategies.
116th Avenue Southeast Stormwater Improvements Page 15 of 18
3. Update the permit matrix developed in Task 1.7 and the project schedule to reflect the detailed
permit evaluation.
Assumptions
1. Federal, State, and County permits will not apply to this project.
2. Permit applications will occur under a future contract amendment.
3. The pre-application meeting will be attended by up to two (2) Tetra Tech staff, including the project
manager. The meeting will last up to one (1) hour. Tetra Tech will facilitate the meeting, prepare
the meeting agenda, and prepare meeting notes.
Deliverables
1. Pre-application meeting agenda and notes.
2. Updated permit matrix.
3. Updated project schedule.
TASK 1.8 – ADDITIONAL, UNANTICIPATED, URGENT, OR SPECIAL SERVICES
This task includes unanticipated services that are time sensitive and crucial to maintaining the project
schedule and progress work. Work performed under this task will not exceed 50 hours and will require
specific, prior written authorization from the City. Written authorization may be granted only after the
Consultant submits both a written scope and costs for the additional work, which is reviewed and specifically
negotiated by the City.
Assumptions
1. The Consultant may plan for the following to address this Task – Up to 50 hours of Project
Management, Engineering, Project Control, or Administrative services.
Deliverables
1. Reports, estimates, drawings, special inspections, field services, public outreach, and
documentation as appropriate.
116th Avenue Southeast Stormwater Improvements Page 16 of 18
ATTACHMENT A.
Tetra Tech Assumptions for BMP’s
Stormwater Assumptions – O&M
1. Proper maintenance is necessary for Stormwater Best Management Practices (BMPs) to be
effective at removing pollutants and reducing runoff volumes as well as peak flow rates for the long
term. Specific maintenance tasks and frequencies may vary based on land use and changes in
activities in the watershed, including increased sediment and trash loads. Increased sediment and
trash loads beyond those predicted through accepted modeling practices will impact overall
performance and may require adjustments to the project after completion of construction. Tetra
Tech will develop an Operations and Maintenance (O&M) manual, as part of the final design in
Phase 2, specifically concerning the elements of the BMP(s). Recommendations for maintenance
tasks and frequencies will be based on current maintenance practices derived from similar BMPs,
manufacturer guidelines for proprietary BMPs, lessons learned during project initiation, and current
maintenance protocols. Tetra Tech is not responsible for variations in the maintenance tasks
and frequencies required for proprietary BMPs or caused by changes in the watershed
characteristics and conditions, including sediment and trash loading.
Stormwater Assumptions – Adaptive Management
1. Changes in the watershed, including an increase or decrease in flow or changes in pollutant loads,
can impact the performance of the BMP and the ability to meet regulatory requirements. Tetra Tech
is aware that performance of similar BMP systems has varied based on changes in the watershed
including turbidity, volumes, filter water elevation, sediment capture, and storm size. Tetra Tech
expects the performance of this system to vary, and an adaptive management maintenance
program will be required. System bypasses will be designed to prevent flow diversions into the
system under specific conditions when performance of the BMP is impacted. During times of
diversion, pollutant loading will not be reduced in the main channel and the ability to meet regulatory
targets will be impaired. Tetra Tech will engage with the City to refine the future O&M manual
update process and discuss preliminary maintenance recommendations, recognizing that
maintenance needs may vary significantly based on storm events (intensity and quantity),
watershed characteristics, and system performance. The O&M manual will be reviewed and
updated every 1-2 years, or as necessitated by operations and maintenance staff, consultants, or
by Tetra Tech under a subsequent task order.
Stormwater Assumptions – Vegetation for Stabilization
1. Vegetation in a BMP, particularly wetland species, can be sensitive to changes in hydrologic regime
such that one or two inches of deviation in ponding depth can influence whether a species survives
or dies. A diverse variety of vegetation, suited to the conditions in the BMP, is recommended to
maximize vegetation survival and establishment. Mature vegetation may vary from the initial
planting plan based in the conditions in the BMP. The densities recommended in the planting plan
are critical for BMP function; however, the species of vegetation may vary.
Standard of Care
1. Work will be completed in conformance with the services provided by an experienced and
competent professional engineering organization rendering similar services under similar
circumstances and in a similar vicinity
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ATTACHMENT B.
Tetra Tech Assumptions for Design Phases
Civil Engineering Design is often presented in 30%, 60%, 90%, and 100% milestones, which are intended
to represent the approximate level of completion of the project design. However, these phases are usually
poorly defined and assumptions regarding what work is complete at which phase are fertile ground for
miscommunication, scope creep, scheduling issues, and inadequate or excessive budgeting. This
attachment aims to supplement the scope of work and to define, for each phase of design, what work
elements should be considered complete at each phase, where future revision would be considered a scope
change, and what work elements are subject to change under the succeeding design phase.
THIRTY PERCENT (30%) DESIGN
30% Design aims to complete field work and base mapping, and to define major project elements, types,
sizes, and locations. Project impacts, easement needs, utility conflicts, and other design considerations are
identified in this stage. However, the specific details of the project elements and conflict resolutions are not
defined at this stage.
After the completion of 30% Design, the following elements will be considered “fixed” as future design
progression will depend on these elements:
Basis of Design
• All existing conditions data collection efforts (topographic, planimetric, and boundary line) are
complete and basemap.
• All other field work (including geotechnical investigations) are complete unless specifically scoped
as an ongoing task.
• Design criteria and technical reference documents.
• List of analytic methods, models, and other necessary software.
Engineering Analysis
• Hydrologic model inputs are complete and preliminary modeling is complete. Any subsequent
modeling will be done only to confirm the performance of specific designs.
• Stormwater BMP Type, Size, and Location (TS&L) analyses are complete, including the use of
proprietary, GULD-certified BMPs.
• Stormwater conveyance calculations.
• Utility conflicts, relocation needs, and responsible parties have been identified, but not resolved.
Engineering Drawings
• Client CAD standards (including title block, borders, logos, contact information, linetypes and
symbology, printed appearance, etc.) have been incorporated and confirmed as correct by Client.
• For sheets developed at 30% design: sheet layouts and viewport extents and confirmed.
• The existing conditions basemap is complete, including the following:
o Topographic data, survey datums, and survey control
o Boundary line information as applicable, including Right-of-Way lines, property lines, and
existing easement lines.
o Planimetric data including existing buildings, roadway geometry (curbs, flow lines, crown,
etc.) and paint striping, utility poles and pedestals, landscaping features, etc.
o Horizontal position (overhead and underground) and vertical position (underground only)
of existing utilities.
116th Avenue Southeast Stormwater Improvements Page 18 of 18
o Critical and/or hazardous area boundaries and buffers relevant such as wetlands, ordinary
high-water lines, aquifer recharge zones, steep slopes, etc.
o Location of field explorations (if surveyed) such as geotechnical test pipes, boring
locations, or monitoring wells.
• Major design features are complete, including the following:
o Preliminary site grading
o The location and orientation of stormwater BMPs and drainage conveyance infrastructure.
o The extents of pavement and sidewalk restoration, repair, or replacement.
o Necessary standard and special details are identified.
o Utility conflicts are shown horizontally. Vertical conflicts are shown if sufficient information
is available.
Construction Cost Estimate
• The bid items in the cost estimate are fixed, but additional bid items are expected to be added in
later design phases.
Technical Specifications
• Technical specifications are not developed at 30% design.
Right-of-Way / Easements
• The need, location, and orientation of Right-of-Way, permanent easements, and/or or temporary
easements necessary for the project are identified.
Permitting
• The permit pathway is defined, including necessary permits, permitting agencies, and anticipated
permit review times.
• Permit requirements are incorporated into the project design constraints.
• Pre-application or other informational meetings with permitting agencies are conducted to confirm
the permit approach. Adjustments to the permit approach are made if necessary.
sea l PcoarTr ty/iumSm
iBl>tl Rae 275.00 180.00 250.00 275.00 205.00 180.00 145.00 130.00 150.00 115.00 125.00 145.00 145.00 105.00 187.50 137.50 75.00
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3 13 24 - - - - 4 - - - - 4 - - $ 4,325 $ - $ $ - 4,325
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1 - 7 - - - 4 - - - - 2 - - - 1,2 $ 45 $ - $ 1,245
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2 2 50 2 4 4 8 8 8 - - 8 2 - 2 $ 8,470 $ - $ 8,470
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Permit Matrix Update
Pre-Application Meetings
Tetra Tech - Confidential and Proprietary Page 1 of 1 Printed 1/5/2026
Job Classification Billing Rate Organization
Principal Engineer / Scientist 275.00$ Tetra Tech
Senior Project Manager 225.00$ Tetra Tech
Staff Project Manager 180.00$ Tetra Tech
Survey Manager 250.00$ Tetra Tech
QA/QC Engineer 275.00$ Tetra Tech
Senior Engineer 225.00$ Tetra Tech
Senior Scientist 205.00$ Tetra Tech
Project Engineer 180.00$ Tetra Tech
Staff Engineer 145.00$ Tetra Tech
Junior Engineer 130.00$ Tetra Tech
Project Scientist 150.00$ Tetra Tech
Staff Scientist 130.00$ Tetra Tech
Junior Scientist 115.00$ Tetra Tech
Lidar Scientist 150.00$ Tetra Tech
Lidar Analyst 115.00$ Tetra Tech
Survey Admin 145.00$ Tetra Tech
CAD / GIS Specialist, Senior 180.00$ Tetra Tech
CAD / GIS Specialist, Project 145.00$ Tetra Tech
CAD / GIS Specialist, Staff 125.00$ Tetra Tech
Contract Administrator 145.00$ Tetra Tech
Admin / Clerical 105.00$ Tetra Tech
Principal 250.00$ Maven Mapping Solutions
PLS 187.50$ Maven Mapping Solutions
Project Manager 187.50$ Maven Mapping Solutions
Quality Manager 187.50$ Maven Mapping Solutions
Project Surveyor 162.50$ Maven Mapping Solutions
Senior Office Tech 137.50$ Maven Mapping Solutions
Office Tech 112.50$ Maven Mapping Solutions
Party Chief 137.50$ Maven Mapping Solutions
Drone Pilot 165.00$ Maven Mapping Solutions
Additional Crew Member 75.00$ Maven Mapping Solutions
Admin 137.50$ Maven Mapping Solutions
CITY OF RENTON PUBLIC WORKS
RATE TABLE
BIG SOOS CREEK AT 116TH AVE SE SEDIMENT CONTROL
9,028 752
Big Soos Creek at 116th Ave SE Sediment Control
Vicinity Map
Legend
0 256
Notes
512
WGS_1984_Web_Mercator_Auxiliary_Sphere
All data, information, and maps are provided "as
is" without warranty or any representation of
accuracy, timeliness of completeness. The
burden for determining accuracy, completeness,
timeliness, merchantability and fitness for or the
appropriateness for use rests solely on the user.
512 Feet
City and County Labels
City and County Boundary
Renton
<all other values>
Environment Designations
Natural
Shoreline High Intensity
Shoreline Isolated High Intensity
Shoreline Residential
Urban Conservancy
Jurisdictions
Streams (Classified)
S - Shoreline
F - Fish
Np - Non-Fish
Ns - Non-Fish Seasonal
Unclassfied
Wetlands
Pump Station
Public Pump Station
Private Pump Station
Discharge Point
Public Discharge Point
Private Discharge Point