Wastewater Treatment Plant Improvements

The City of Selah is requesting sealed bids for Phase 2 wastewater treatment plant improvements, with bids due July 30, 2026 at 1:00 p.m. and a pre-bid conference on July 16, 2026 at 10:00 a.m. at the project site. The project is subject to Washington State prevailing wage requirements and apprentice utilization mandates under RCW 39.04.320, requiring registered apprentices for not less than 15 percent of labor hours in apprenticeable occupations.

The scope includes modification and extension of the solids handling building with installation of new biosolids dewatering and drying equipment, new sludge and polymer feed pumps, and rerouting of internal and site piping. Work also encompasses enclosing the existing truck loading bay with a pre-engineered metal building and constructing a new truck loading bay on the south side of the solids handling building. The bid proposal requires unit prices for mobilization, indirect dryer and ancillary equipment installation, centrifuge and ancillary equipment installation, new building construction, building modifications, site grading and paving, site piping and fittings, and electrical and control systems, with an estimated state sales tax of 8.5 percent applied to the bid subtotal.

Contract performance is anticipated to begin by September 8, 2026, with a project duration of 260 working days. Liquidated damages apply for each working day the project remains uncompleted after the specified contract period. Bidders must submit a bid deposit or bid bond equal to not less than five percent of the total bid amount. The successful bidder must furnish a contract bond equal to 100 percent of the contract price. The apparent low bidder must submit a Supplemental Bidder Responsibility Criteria Statement by 12:00 p.m. on the second business day following the bid deadline. Contract documents are available at https://www.hlacivil.com/bid/. Questions should be directed to Robert J. Scott, PE, at (509) 966-7000 or rscott@hlacivil.com.