2019-11-12-minutes-public-works-study-session

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�G DFA ... rn IGMTAS COUNTY KZTTITgS CO DEPARTMENT OF PUBLIC WORKS Hart Crowser will start analysis and reporting immediately upon receiving notice to proceed (NTP). We estimate that the engineering analyses and draft geotechnical report supplement should be completed approximately 3 weeks after NTP. However, Hart Crowser will consult with the design team regularly to provide the results of our analyses and recommendations. TASK 4 HYDRAULIC DESIGN Watershed Science & Engineering (WSE) will provide hydraulic engineering services for the Big Boulder Creek Bridge Replacement Project in Kittitas County, Washington. WSE will lead the hydraulic engineering portions of the project which will include completing the following tasks. TASK 4.10 — Data Collection and Review WSE will collect and review existing data and information needed to complete the hydraulic investigation. Data will include but not be limited to topographic maps including LiDAR data, historical aerial photos, flood data, bridge maintenance records, and anecdotal information on past flood events from County maintenance staff. Assumptions: • County will supply relevant data they possess TASK 4.20 — Site Inspection WSE will conduct a one -day field inspection to examine the crossing and Big Boulder Creek. WSE will examine hydraulic and geomorphic characteristics, sediment transport, debris flow potential, lateral erosion, and scour. Assumptions: • NTP is received in time to allow WSE to visit the site before snow fall. TASK 4.30 — ChanneI Survey WSE will survey up to eight cross sections and a longitudinal profile of the stream channel as part of the site inspection task above. WSE will merge the stream channel data with the County's survey to develop a single topographic base map required for the hydraulic investigation. Assumptions: County will or has collected detailed topographic data within the road right -of --way.