The work to be performed by the CONSULTANT consists of preparing civil, structural, geotechnical and environmental engineering design and permitting for replacement of the two culverts on Delameter Road at milepost 4.10 and milepost 4.42. The work also includes providing engineering support during construction. The proposed project includes replacing the existing concrete box culverts with new structures that meet the Washington Department of Fish & Wildlife requirements for fish passage. The new structures shall be long enough to support a 36- foot-wide paved road to meet County standards for a rural major collector. Included in the project will be streambed restoration and riparian plantings in the vicinity of the culverts and reconstruction of the roadway approaches. The County will provide the topographic survey, boilerplate specifications, and pavement section. The County will be responsible for developing right of way plans, obtaining appraisals and negotiating for easement acquisition and for project bidding and award. The major features of the project are as follows: • Remove the existing culverts. • Wetland and ordinary high-water delineation. • Geotechnical engineering to determine subsurface conditions and to develop foundation recommendations. • Environmental documentation and preparation of permit applications for all federal, state and local permits (NEPA/SEPA/Critical Areas/Shorelines). • Hydraulic design of the water crossing structure openings. • Determining 100-year flood water surface elevations. • Structural Design of the new water crossing structures. • Temporary traffic control including any necessary temporary traffic bypass roads. • Special Provisions. • Wetland mitigation bank use plan. • Construction support including submittal review, responses to requests for information, and site inspections of key construction items.
