Site work for a water / sewer project in Tigard, Oregon. Completed plans call for site work for a water / sewer project; and water / sewer project.

Furnish all labor, materials, and equipment necessary to: construct and commission a new engineered media biofilter consisting of a single-cell, reinforced concrete basin with integral air distribution, internal high-density polyethylene liner, engineered media, media floor support system, water panel, and humidification and irrigation system; install and commission two new odor control fans located adjacent to the biofilter; modify, re-route, and provide new foul air ducting and supports within the Headworks facility to the new odor control fans and biofilter; demolish the existing odor mist scrubber, including the odor exhaust fan, unused foul air duct, low-pressure air piping, and chemical piping; install and commission two Owner-furnished variable speed drives in the upper electrical room; install instrumentation and control stations, associated conduits, conductors, and other necessary appurtenances; fill abandoned force mains below the biofilter footprint with grout; finish grading to incorporate the biofilter into the earthen bank south of Headworks, including a new concrete stairway alongside the biofilter and a cart path extending to the digester gas treatment skid; install site lighting to illuminate access around the biofilter, odor control fans, and cart path; install irrigation sleeves at hardscape crossings (final landscaping and site irrigation by Owner); and install new drainage piping and manhole for the biofilter drain, connecting to the existing sanitary sewer line. Each Bid must be submitted on the prescribed Bid Form and accompanied by Bid security as prescribed in the Instructions to Bidders. Prior to submission, Bidders must be registered with the Oregon Construction Contractors Board. Bidders must deliver the original Bid security by mail or hand delivery within five business days after the deadline. The Successful Bidder will be required to furnish additional bond(s) and insurance as prescribed. Bidders must be qualified in accordance with relevant Oregon statutes. The Work does not involve asbestos. For questions regarding technical and administrative issues, contact Owner: Steve Waldron, at 503.547.8134 or by email to WaldronS@CleanWaterServices.org. Questions received after April 2, 2026 at 2:00 p.m. may not be answered.