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Home My WebLink AboutRES 2023-032BOARD OF COUNTY COMMISSIONERS COUNTY OF KITTITAS STATE OF WASHINGTON RESOLUTION NO. 2O:r, - 02 A AUTHORIZING THE KITTITAS COUNTY PUBLIC WORI(S DIRECTOR'S SIGNATURE ON TASK ORDER NO. 1 WITH WATERSHED SCIENCE AND ENGINEERING F'OR THE WEST INTERCHANGE ITYDRAULIC 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 technicalanalysis and developed a 2-dimension hydraulic model to assess flooding risk in the West Interchange project area; and WHEREAS: The Flood ControlZone 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 ControlZone District budgeted floodplain modeling support inthe2023 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. 1 for the West Interchange Hydraulic Analysis Project in the amount of $98,722. DATED this 2lst day of February 2023, at Ellensburg, Washington. .,r1rt\llll l'i// //llr, .1.$'.,1 COA,;rV,, i,,o,. -,.+..'gr'.". . "' '.. :.:)'),i'i:" S rY." "."4. -- .== ;t CE*...'...-- 'i'f,? i O , ":r ;,.4. ,/' ll ! : Z ).. .-.--*" _ , i_t ! ?r_l13-,..4ttest, . .,^g=S ? (\n "',....." "" .. lU .tt "ffirIltd$in'i' """r4- r u I ie Kj orsv i k n Deputy Clerk of the Board- Mandy Buchholz BOARD OF COUNTY COMMISSIONERS LINTY TON Cory Wright, Vice-Chairman ITY:DTIII)5.S (>(OIIIirlfY DEPARTMENT OF PUBLIC WORKS Formal Task Order Document WATERSIIED Science and Engineering Task Order Number I Maximum Amount Payable $98,722 Completion Date t2t3U2023 The general provisions and clauses of the 2022 - 2024Ttsk Ordcr Master Contract for Hydraulic and Hydrolory Professional Consulting Senices shall be in full force and elfect for this Task Order. Location of Project: I-90 West Interchange area Project Title: West Interchange Hydraulic Analysis Description of Work Hydraulic modeling, evaluatior\ 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 & 4:3tr-2023 Agency Signature:Date: Consultant Signature:Date: 2-Il -7p>9 €+WATERSHED SCIENCE & ENGINEERING February t4,2023 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 l-90 West lnterchange 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 lnterchange Study Area WSE's scope will include the following tasks: Task 1. Data Collection and Review Task 7.7 Ddta Collection dnd Review WSE will collect and review existing data needed to conduct the study. Data will include but not be limited to the effective Flood lnsurance Study (FlS), 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, a nd stakeholder objectives. NEECIR CRK CURR!ER CRK t,irtt' 'ltl 't,1"Hl5FtEY r-lRKl- il,:j Huly 97 t * }? t r) *, FrtilPr lsLo pftil -llL'i.:T At{l_A l-90 wEsr IHTERCHANGE €+ y,ffFa"s,,T.FR February r4,2o23 Task 2. Hydraulic Modeling and Analysis Task 2.7. Update EffeAive Modelto HEC-RAS 6.3.7 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 modelto 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 2,2, lnitidl Alternotives 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 inundationextentsbyincreasingnearchannel floodconveyanceandstorage. Agoal istodosoina manner that will provide multiple benefits in the form of reduced flood risk and habitat enhancement. The two alternatives are: o 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 L% AEP flood, o 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 t% 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: lnitial concept sketches showing alternative L and alternative 2 Final alternative layout sketches to support hydraulic modeling Task 2.3. Hydraulic Modeling WSE will update the hydraulic modelto represent the two alternatives developed in Task 2.2. WSE will run the models to simulate the L% 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 €+ y,*[F,T;#,5R February 14,2023 County and stakeholders to support land use planning discussions. Project stakeholders willselect a preferred alternative for additional refinement (Task 2.a.) 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 throughcoordinationwiththeCountyandprojectstakeholders(Task2.2). lnitialgradingforthe 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 lhe I% 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 Memorondum 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 stakeholdergroup 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 SCIENCE & ENGINEERING February 14,2023 Task 3. Development lmpact 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 potentialflood impacts of full buildout conditions under the revised plan. Task 3.7. Flood Review of Proposed Development WSE will: o 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. o 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: WSEandwillparticipateinuptotwovirtualmeetingswithMFAtodiscussdevelopment 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 conceptualfull buildout plan. Task 3.2, Floodplain lmpoct and Compensotory Stordge Assessment WSE will update the preferred alternative hydraulic model to incorporate the proposed development full buildout fill plan, run the model to simulate the t% 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 potentialflood 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 €+ w.frTF*"S,#*R February 14,2023 Task 4. Project Administration and Meetings Task 4,7. Project Administration WSE 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 €+WATERSHED SCIENCE & ENGINEERING Exhibit B - Estimate of Professional Services Prepared for: Kittitas County Project: West lnterchange Hydraulic Analysis Date: February 1,2023 Prepared By: Chris Frei 506 2nd Ave, Suite 2700 Seaftle, WA 98104 Tel. (206) 521-3000 Hours ASK DESCRIPTION Prin Sr. Eng. I Sr. Geo.Staff Eng. Junior Eng Gts Specialist Contract Admin Totals 1. Data Collection and Review $3,753 1.1 Data Collection and Review 8 16 $3,753 $47,772 2.1. Update Effective Model to HEC-RAS 6.3.1 4 24 40 $8,847 2.2. lnitial Alternatives Development and Review 2 8 16 $4,209 16 80 40 $18,766 8 4Q 20 !9,383 2 12 24 4 s6,56E $20,0263.Assessment Development 12 16 $5,951 l-loodplarn lmpacts and L;om0ensatory 8 40 20 $9,383 mo 2 8 16 4 $4,691 4. Administration and Meetings $26,818 4.'l Project Administration 2 I 6 $2,583 4.2 Meetings 8 16 4 $4,2364.J AOmrntsuallve Keserve l'z{J,{J00 j:! 8.0 100.0 0.0 284.0 148.0 6.0 .87 .06 I $86.43 $519$0$1,823 $20,1 06 $0 $38,067 gl 7,855 Labor Rate ($/hr) AL LABOR COST Direct Cost Detail Units Rate Cost $328 Total $353 500 $0.655Travel to Project Site Reproduction and Communication Total ]98,722 Total Labor Total Direct Expenses $98,370 $353