GeoEngineers 5/9/2016 - Laserfiche WebLink

Lake Chaplain Road Culvert and Embankment Replacement Exhibit A, Page 2 • Evaluate the final slope stability of the design alternative using the computer program SLOPE/W for multiple cases including steady state, rapid drawdown, and seismic. Final slope stability analyses will be completed for the configured design embankment considering the required headwalls and grading. • Selection of final culvert type and dimensions,to be determined in concert with project permitting. • Design of headwall and wing wall retaining structures. This will include evaluation of lateral earth pressures, wall embedment, and backfill consideration for design of MSE walls. If MSE walls are not utilized, we understand the City will assist with the design or standard WSDOT reinforced concrete retaining walls will be utilized. • Design of in-stream grade control measures to maintain adequate depth of cover over the City's water line • Design of streambed slope throughout the project reach • Development of a temporary erosion and sediment control plan and temporary stream diversion or dewatering, as required. • Development of streambed sediment mix consisting of either native materials or import materials meeting WDFW requirements. • Attend one or two meetings with the City during plans preparation. Task Assumptions: • 30% plans will be developed in the required permit package format, which is in black and white, 8.5 x 11, plans,with details required for JARPA review. • 30%plans will be transferred to full size sheet format per the City of Everett drafting standards and presented in 1 size(11 X17)sheets for the 90%design review package. Task 2. Prepare 90%Engineering Design Package(City may complete entire task in-house.) • Prepare 90 percent design plans including technical specifications and engineer's cost estimate. Modify the plans as necessary in response to permit applications to appropriate federal, state, and local permit agencies per the results of task 5 below. Attend meeting at the City and submit plans for City review. Task 3. Prepare 100%Engineering Design Package(City may complete entire task in-house.) • Incorporate City review comments from 90% plans and provide 100 percent design submittal for bidding. We assume the City will provide the front end of the bid package and complete the bid process. Task 4. On-Call Bidding and Construction Support Provide on-call technical support during bidding and project construction. Task 5. Permitting Support Based on our experience with similar culvert replacement projects we assume that this project will require the following authorizations: GeoEngineers File No.0661-107-00