Res-2018-074 Task Order 3 - Laserfiche WebLink

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TASK 7 HYDRAULICS The original scope of work shown in this task requires an increased level of effort. The original scope for the Story Creek site was to provide a supporting role to COUNTY staff that had intended on delivering the hydraulic design and report(s}. The new scope directed by the COUNTY is that the CONSULTANT shall provide the hydraulic analysis and report(s} for the Story Creek site. The original scope for the Lick Creek site was to provide hydraulic analysis and design for a short length (approx. 300 feet} of new creek channel from the west side of Teanaway Road to the east side and reconnect to the existing channel on the east side of the road. The new scope directed by the COUNTY is to realign the entire Lick Creek channel away from the existing channel on the east side of the road, and take the new creek channel easterly across the DNR property (approx. 2000 feet) to a new discharge point into the Teanaway River. The new or deleted scope is shown below: TASK 7 .1 -Story Creek • Added Sc ope: • Hydraulics • Perform hydraulic modeling to ascertain the hydraulic characteristics necessary to support the design of the new culvert crossing and potential scour countermeasures for the protection of the roadway prism. The hydraulic model will be developed using topographic data collected by the County's selected surveyor. • Bank Stability Assessment and Design • Examine stability of the existing scour protection and creek banks utilizing various design manuals such as, Integrated Streambank Protection Guidelines (ISPG), HEC-18, HEC-23, etc. • Identify proposed measures that are acceptable from a channel stability and habitat perspective. • Scour Analysis • Compute depth of scour estimates for the proposed culvert cross i ng and for any necessary scour countermeasures. • Team Meetings & Permitting Assistance • Key project elements and findings will be discussed with the services and select stakeholders as determined by CONSULTANT and COUNTY staff. Likely participants will include the USACE, WDFW, and potential property owners. • Documentation • The results of the hydraulic and scour assessment will be summarized in two separate documents, specifically, a Preliminary Basis of Design and a Final Basis of Design Report. The report will include a description of the physical characteristics of the site, Scope of Service_ Teanaway Hyd lmp_Amend 01_2018-04-19 Page 4 of 19