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€+WATERSHED <br />SCIENCE & ENGINEERING February t4,2023 <br />Exhibit A -Scope of Work <br />West Interchange Hydraulic Analysis Scope of Work <br />Kittitas County, WA <br />CenterFuse, a business development authority for the City of Ellensburg, has commissioned a study to <br />develop a land use and development plan for the l-90 West lnterchange area (study area) within Ellensburg <br />and unincorporated Kittitas County, WA (Figure 1). Portions of the study area are located within the <br />mapped FEMA floodplain and floodway of Reecer and Currier Creeks. Kittitas County will provide input to <br />the plan by using existing County hydraulic models to evaluate two alternatives to reduce flooding within <br />the study area. The County has retained Watershed Science & Engineering (WSE)to complete the hydraulic <br />modeling, evaluation, and refinement of the alternatives. The work will be completed using the County's <br />FEMA effective HEC-RAS 2D models of Currier and Reecer Creeks. <br />Figure 1. Approximate West lnterchange Study Area <br />WSE's scope will include the following tasks: <br />Task 1. Data Collection and Review <br />Task 7.7 Ddta Collection dnd Review <br />WSE will collect and review existing data needed to conduct the study. Data will include but not be limited <br />to the effective Flood lnsurance Study (FlS), topographic data including 2019 LiDAR, existing condition land <br />use, and existing building locations. WSE will communicate with CenterFuse's consultant Maul Foster <br />Alongi (MFA) to obtain information on proposed conceptual development plans, existing land ownership, <br />a nd stakeholder objectives. <br />NEECIR CRK CURR!ER CRK <br />t,irtt' 'ltl <br />'t,1"Hl5FtEY r-lRKl- il,:j <br />Huly 97 <br />t <br />* <br />}? <br />t <br />r) <br />*, <br />FrtilPr lsLo <br />pftil -llL'i.:T At{l_A <br />l-90 wEsr <br />IHTERCHANGE