100315_13_Willow_Creek_Culvert_Details.pdf

This file contains detailed technical specifications and design drawings for a precast three-sided arch culvert structure being solicited by Washington County, Oregon for the NW Walker Road project (Project 100315). The culvert must be manufactured to precise dimensions of 28 feet by 11 feet by 93.5 feet in maximum 6-foot lay-length sections and delivered to the project site located on NW Walker Road between NW 173rd and NW 178th Avenues. Sealed bids are due by April 15, 2026 at 2:00 p.m., with questions due by April 13, 2026 at 5:00 p.m. The contractor selection date is April 28, 2026, and installation is scheduled between August 1 and September 30, 2026. Bidders must submit electronic bids through the County's e-Procurement portal and must execute a contract within 15 business days of notification. Prior to work commencement, successful contractors must submit a preliminary work schedule and Contractor Safety Information Form at a pre-construction meeting.

The solicitation is structured as a single lump-sum line item with an estimated project cost ranging from $300,000 to $700,000, with a baseline estimate of $575,000 for budgeting purposes. All bids must include manufacturing, engineering support, design services, storage at the manufacturing facility, joint sealant materials, shims, mounting hardware, lifting inserts, and FOB delivery to the project site. Successful bidders must provide shop drawings stamped by a Professional Engineer, including design standards, material specifications, pick weights, and handling and delivery details. Insurance requirements include workers' compensation ($500,000/$500,000/$500,000), commercial general liability ($1,000,000 per occurrence/$2,000,000 aggregate), and automobile liability insurance ($1,000,000 combined single limit), with Washington County named as additional insured. Bid guaranty forms and bid bonds have been waived. Payment terms are established at thirty days following invoice approval by the County Contract Administrator, and either party may terminate the contract for convenience with thirty days' notice. Bidders must verify resident status under Oregon Revised Statutes 279A.120 and comply with all applicable federal, state, county, and local laws and regulations, including OSHA requirements.