HomeMy WebLinkAboutResolution_TO1_WatershedScience_WInterchangeKITTITAS COUNTY
DEPARTMENT OF PUBLIC WORKS
2023 AGENDA STAFF REPORT
AGENDA DATE: February 21, 2023
ACTION REQUESTED: Request to approve a Resolution to authorize the Kittitas
County Department of Public Works Director's Signature
on Task Order No. I with Watershed Science and
Engineering for the West Interchange Hydraulic Analysis
BACKGROUND: The Flood Control Zone District has been meeting with
West Interchange Property owners discussing economic
development issues and the mapped floodplain in the area
for several years. Recently, CenterFuse secured a planning
grant through the Department of Commerce to evaluate
land use development in this area of Ellensburg.
Supporting this effort, the Flood Control Zone District
budgeted floodplain modeling support in the 2023 Capital
budget and staff is ready to contract for said services with
Watershed Science and Engineering. The proposed scope
of work cost is approximately $98,722.00.
Public Works staff presented the Watershed Sciences and
Engineering Scope of Work at the February 13, 2023, study
session and received direction to prepare enabling
documents to execute the task order.
INTERACTION: Public Works.
RECOMMENDATION: Approve the Resolution to authorize the Kittitas County
Department of Public Works Director's signature on Task
Order No. 1 with Watershed Science and Engineering for
the West Interchange Hydraulic Analysis
HANDLING: Return one original to Public Works.
ATTACHMENTS: Resolution; Task Order No. 1 with Watershed Science and
Engineering for the West Interchange Hydraulic Analysis
LEAD STAFF: Arden Thomas, Water Resource Manager
BOARD OF COUNTY COMMISSIONERS
COUNTY OF KITTITAS
STATE OF WASHINGTON
RESOLUTION NO. 2023 -
AUTHORIZING THE KITTITAS COUNTY PUBLIC WORKS DIRECTOR'S SIGNATURE ON
TASK ORDER NO. 1 WITH WATERSHED SCIENCE AND ENGINEERING FOR THE WEST
INTERCHANGE HYDRAULIC ANALYSIS PROJECT
WHEREAS: Kittitas County Public Works procured on-call professional hydraulic and hydrologic
engineering services from Watershed Sciences and Engineering (WSE) in December
2022; and
WHEREAS: WSE previously conducted technical analysis and developed a 2 -dimension hydraulic
model to assess flooding risk in the West Interchange project area; and
WHEREAS: The Flood Control Zone District has been planning with West Interchange property
owners discussing economic development issues and mapped floodplain for several
years; and
WHEREAS: CenterFuse recently secured a Department of Commerce planning grant to evaluate land
use development in the West Interchange Area; and
WHEREAS: The West Interchanges Hydraulic Analysis Project will help inform the CenterFuse led
planning effort; and
WHEREAS: The Flood Control Zone District budgeted floodplain modeling support in the 2023
Capital budget for modeling support services; and
WHEREAS: Watershed Science and Engineering has prepared a scope of work and fee for Hydraulic
Analysis in the West Interchange area in the amount of $98,722.
NOW, THEREFORE BE IT RESOLVED that the Board of County Commissioners, in the best interest
of the public, does hereby authorize the Kittitas County Department of Public Works Director's signature
on Watershed Science and Engineering Task Order No. I for the West Interchange Hydraulic Analysis
Project in the amount of $98,722.
DATED this 21st day of February 2023, at Ellensburg, Washington.
Attest:
❑ Clerk of the Board- Julie Kjorsvik
❑ Deputy Clerk of the Board- Mandy Buchholz
BOARD OF COUNTY COMMISSIONERS
KITTITAS COUNTY, WASHINGTON
Cory Wright, Chairman
Brett Wachsmith, Vice -Chairman
Laura Osiadacz, Commissioner
x�yy KZTTZTgil3 COUNTY
DEPARTMENT OF PUBLIC WORKS
q'ITI'IAS COUNTY
Formal Task Order Document
WATERSHED Science and Engineering
Task Order Number
Maximum Amount Payable $98,722 Completion Date
12/31/2023
The general provisions and clauses of the 2022 - 2024 Task Order Master Contract for
Hydraulic and Hydrology Professional Consulting Services shall be in full force and effect
for this Task Order.
Location of Project: I-90 West Interchange area
Project Title: West Interchange Hydraulic Analysis
Description of Work: Hydraulic modeling, evaluation, and refinement of alternatives to reduce
flooding within the study area. A full scope of work is attached to this Task Order.
Cost Breakdown: See attached Scope of Work
Project Schedule: Task 1: May 31, 2023
Task 2: August 30, 2023
Tasks 3 & 4: December 31, 2023
Agency Signature:
Date:
7"9V
e
Consultant Signature: Date: _ z - �`{ -Zo Z
WATERSHED
SCIENCE & ENGINEERING February 14, 2023
Exhibit A —Scope of Work
West Interchange Hydraulic Analysis Scope of Work
Kittitas County, WA
CenterFuse, a business development authority for the City of Ellensburg, has commissioned a study to
develop a land use and development plan for the 1-90 West Interchange area (study area) within Ellensburg
and unincorporated Kittitas County, WA (Figure 1). Portions of the study area are located within the
mapped FEMA floodplain and floodway of Reecer and Currier Creeks. Kittitas County will provide input to
the plan by using existing County hydraulic models to evaluate two alternatives to reduce flooding within
the study area. The County has retained Watershed Science & Engineering (WSE) to complete the hydraulic
modeling, evaluation, and refinement of the alternatives. The work will be completed using the County's
FEMA effective HEC -RAS 2D models of Currier and Reecer Creeks.
Figure 1. Approximate West Interchange Study Area
WSE's scope will include the following tasks:
Task 1. Data Collection and Review
Task 1.1 Data Collection and Review
WSE will collect and review existing data needed to conduct the study. Data will include but not be limited
to the effective Flood Insurance Study (FIS), topographic data including 2019 LiDAR, existing condition land
use, and existing building locations. WSE will communicate with CenterFuse's consultant Maul Foster
Alongi (MFA) to obtain information on proposed conceptual development plans, existing land ownership,
and stakeholder objectives.
� i WATERSHED
'�` SCIENCE x ENGINEERING February 14, 2023
Task 2. Hydraulic Modeling and Analysis
Task 1.1. Update Effective Model to HEC -RAS 6.3.1
The current FEMA effective model of Reecer and Currier Creek was completed in 2016 using HEC -RAS
version 5.0.7. WSE will update the FEMA HEC -RAS model to the latest version of HEC -RAS (v 6.3.1), and will
run the model to simulate the 1 -percent annual exceedance probability (AEP) flood and floodway. Results
will be compared to effective model results to identify changes to BFEs or floodway elevations. Results of
the updated model will provide the baseline for comparison of project alternative impacts (Task 2.3).
Assumptions — Updating the model from 5.0.7 to 6.3.1 will result in only minor changes to BFEs or
floodway elevations. Significant updates to the model geometry or floodway will not be required.
Task 2.1. Initial Alternatives Development
WSE will develop preliminary concept sketches for two (2) channel and floodplain modification alternatives
which will provide an inset floodplain corridor along Currier and Reecer Creeks to reduce 1% AEP flood
inundation extents by increasing near channel flood conveyance and storage. A goal is to do so in a
manner that will provide multiple benefits in the form of reduced flood risk and habitat enhancement. The
two alternatives are:
• Alternative 1— Maintain the existing Reecer and Currier Creek channel alignments and excavate
floodplain benches to create an inset floodplain that will contain the majority of the 1% AEP flood.
• Alternative 2 — Realign and/or combine portions of the Reecer and Currier channels and excavate
floodplain benches to create an inset floodplain that will contain the majority of the 1% AEP flood.
The layout and extent of the combined and realigned channel would be developed based on
direction from resource agency and tribal stakeholders.
To help conceptualize the alternatives, WSE will participate in up to two, 1.5 -hour virtual meetings with
MFA, stakeholders and County staff.
Assumptions:
The primary goal at this stage in the project is develop floodplain modifications that will reduce flood
extents and BFEs so that significant and permittable floodplain development can occur; however, WSE will
not attempt to develop alternatives that accommodate a specific development plan. This will be addressed
in Task 3 below.
Deliverables:
Initial concept sketches showing alternative 1 and alternative 2
Final alternative layout sketches to support hydraulic modeling
Task 1.3. Hydraulic Modeling
WSE will update the hydraulic model to represent the two alternatives developed in Task 2.2. WSE will run
the models to simulate the 1% AEP flood and compare results to baseline conditions to identify changes in
inundation extents and BFEs. WSE will refine the alternative project layouts to attempt to maximize
floodplain benefits and minimize impacts. Following these refinements, WSE will generate figures
comparing baseline and proposed condition inundation extents and BFEs. Results will be presented to the
Lil� WATERSHED
SCIENCE & ENGINEERING
February 14, 2023
County and stakeholders to support land use planning discussions. Project stakeholders will select a
preferred alternative for additional refinement (Task 2.4.)
Deliverables:
Figures comparing alternative flood extents and BFEs to baseline BFEs and flood extents.
Conceptual sketches of the proposed alternatives
Assumptions:
Project extents, available work area, and channel realignments for both alternatives will be determined
through coordination with the County and project stakeholders (Task 2.2). Initial grading for the
alternatives will be provided to WSE by the County as a LandXML for incorporation into the model terrain.
Presentation of results will take place via a virtual call that will last two hours.
Task 2.4. Preferred Alternative Refinement
WSE will refine the preferred alternative to maximize benefits and minimize impacts based on feedback
from stakeholders. WSE will run the model to simulate the 1% AEP flood and compare results to baseline
conditions to document changes in flood depth and floodplain storage. WSE will generate figures
comparing baseline and proposed condition BFEs, and inundated extents. Results will be presented to the
County and project stakeholders to support land use planning discussions.
Deliverables:
Figures comparing the preferred alternative BFEs and flood extents to baseline BFEs and flood extents
Assumptions:
The preferred alternative condition will be determined through coordination with stakeholders.
Presentation of results will take place via a virtual call that will last two hours.
Task 2.5. Technical Memorandum
WSE will prepare a technical memorandum to document study methods, assumptions, and results. The
memorandum will also include descriptions of additional floodplain development factors that will need to
be evaluated/considered if the stakeholder group decides to advance the preferred alternative ( e.g. a
FEMA conditional letter of map revision (CLOMR), compensatory storage requirements, floodplain impacts
that will need to be mitigated). The memorandum will be submitted to the County for review. WSE will
finalize the memorandum upon receipt of comments.
Deliverables:
Draft Memorandum
Final Memorandum
19-0� WATERSHED
SCIENCE & ENGINEERING February 14, 2023
Task 3. Development Impact Assessment
Based on results from Task 2, MFA will revise the proposed development plan to accommodate the
preferred flood reduction alternative. WSE will complete the following tasks to assess potential flood
impacts of full buildout conditions under the revised plan.
Task 3.1. Flood Review of Proposed Development
WSE will:
• Create figures that overlay the proposed development plan on top of the flood inundation extents
and BFEs. This will identify the areas of planned development that will be impacted by flooding.
• WSE will present the figures to the County, MFA, and stakeholders in a virtual meeting. The results
and potential required development refinements will be discussed.
Deliverables: Figures overlaying proposed development concept on flood extents and BFEs.
Assumptions: WSE and will participate in up to two virtual meetings with MFA to discuss development
alternatives. MFA and the stakeholders will select a preferred development concept. MFA will refine the
development concept to reflect recommendations expressed during the stakeholder meeting, and will
develop a conceptual full buildout plan.
Task 3.2. Floodplain Impact and Compensatory Storage Assessment
WSE will update the preferred alternative hydraulic model to incorporate the proposed development full
buildout fill plan, run the model to simulate the 1% AEP flood, and compare results to baseline conditions
to document changes in floodplain BFEs, inundated extents, and flood storage. The purpose will be to
evaluate potential flood impacts and compensatory storage requirements of full buildout conditions.
Results will be provided to the County and project stakeholders to support land use planning discussions.
Deliverables:
Figures comparing BFEs and flood inundation for full buildout conditions to baseline conditions to support
floodplain impacts assessment and compensatory storage requirements for the proposed development
Assumption:
Fill extents for the full buildout condition would be determined by MFA and the County. The County will
provide a LandXML including grading/fill for each land use alternative to WSE for incorporation into the
hydraulic model.
Task 3.3. Technical Memorandum
WSE will prepare a letter report to document the floodplain impacts and compensatory storage
requirements for the full buildout condition. The memorandum will also include descriptions of additional
floodplain development factors that will need to be evaluated/considered if the stakeholder group decides
to advance the preferred alternative (e.g. a FEMA conditional letter of map revision (CLOMR),
compensatory storage requirements, floodplain impacts that will need to be mitigated). The memorandum
will be submitted to the County for review. WSE will finalize the memorandum upon receipt of comments.
Deliverables:
Draft Memorandum
Final Memorandum
WATERSHED
SCIENCES ENGINEERING February 14, 2023
Task 4. Project Administration and Meetings
Task 4.1. Project Administration
VISE will conduct general project administration activities including keeping the County's project manager
informed of all significant project related news, preparation of monthly invoices and general contract
management.
Task 4.2. Meetings
WSE will participate in a project kick of meeting with staff members from Kittitas County to discuss project
scope, and to collect creek information and historical flooding observations. The kick off meeting will be
held virtually. WSE will participate in up to four (4) 1.5 hour virtual meetings with the County and other
stakeholders to discuss alternative development and floodplain options, to present flood study results.
WSE will prepare presentation materials. Meeting location, timing, and attendance will be coordinated by
Kittitas County.
Task 4.3. Administrative Reserve
An administrative reserve is included to allow WSE to address additional questions or issues that may arise
during project review or coordination with CenterFuse, MFA, the County, and other stakeholders. This may
include additional analysis, modeling, meetings, presentations, documentation, or discussion.
Administrative reserve funds will only be used following expressed written direction from the County.
Cost
See Attached Estimate of Cost
vii WATERSHED
SCIENCE & ENGINEERING
506 2nd Ave, Suite 2700
Seattle, WA 98104
Tel. (206) 521-3000
Exhibit B - Estimate of Professional Services
Prepared for:
Kittitas County
Project:
West Interchange
Hours
Hydraulic Analysis
Date:
February 1, 2023
Prepared By:
Chris Frei
TASK DESCRIPTION
Hours
Prin
Sr. Eng. I
Junior
Sr. Geo. Staff Eng. Eng.
GIs Contract
Specialist Admin
Totals
1. Data Collection and Review�;
$3,753
1.1 Data Collection and Review
16
$3.753
2. Hydrology and ify—dmurics
$47,772
$8,847
2.1. Update Effective Model to HEC -RAS 6.3.1
24 40
2.2. Initial Alternatives Development and Review_2
8
16
--$4,209
2.3. Hydraulic Modeling of Channel Modification Alternatives16
so
40
$18,766
2.4. Preferred Alternative Refinement
—
8
12
—
Q
20
$9.383
2.5. Technical Memo
_2
— —
24 4
$6.568
--
116eirelcipment Impact Assessment
$20,026
3.1 Flood Review of Proposed Development_12
12 16
$5,951
3.2. Floodplain Impacts and Compensatory Storage Assessment
8
40
$9.383—
8
16
_20
4
$4.691
4. Administration and Meetings—
$26,818
4.1 Protect Administration
6
$2,583
4.2 Meetings_8
—8
16
4
$4236
4-1.3 Administrative Reser�-
$28,000
Total Hours and Direct Labor Cost (DI-)
Labor Rate (Shr) 1
TOTAL LABOR COST
. ....
8.0
$227.871
$1,823
.. .....
........
100.0 1
$201.06 1
$20,106
.. ... ... ...
0.0 1
$160.85 1
$0
. . . .... ....
...
284.0 1
$134.04 1
$38,067
148.0 1
$120.64 1
$17,855
0. 0 j
$85.98 1
$0
to
$86.431
$519
1
Direct Expense Detail
Labor
Direct Expenses
Total