Site work, new construction and renovation of a civil project in Tigard, Oregon. Completed plans call for the construction of a water / sewer project; for the renovation of a water / sewer project; and for site work for a water / sewer project.

Contractor shall complete the work as specified or indicated in Owner's Contract Documents for the Project. The Project generally consists of the following: Furnish all labor, materials, and equipment necessary to: a. Construct and commission a new 1.3-million gallon, cast-in-place concrete, anaerobic digester with a vertical mixer mixing system (new digester). b. Install and commission new digester support systems including, but not limited to, a new spiral heat exchanger, hot water pump and piping, digester sludge recirculation pump and piping, grinder, and associated control valves. Install and commission new redundant digester sludge recirculation pumps for the existing Digester Complex 2 (DC2) digesters 1 and 2. c. Construct digester gas system improvements including, but not limited to, new digester pressure relief and vacuum valves, foam separator, moisture separator, gas flow meter, isolation valves and piping associated with the new digester. d. Construct a new access bridge from the DC2 control building to the new digester. e. Modify the existing DC2 digesters, including, but not limited to, adding fall protection tie off anchors at roof access hatches, access modifications to the digester overflow box, replacement of existing overflow isolation slide gates with new knife gates, and installation of new digester gas isolation valves. f. Construct improvements to the Digester Complex 1 (DC1) flare including, but not limited to, a new modulating waste gas burner (WGB) bypass valve, new regulator, new WGB electronic controller, new spark generator and panel, a new uninterruptible power supply, and new exposed and buried digester gas piping. g. Install and commission new actuated valves for the digester feed to DC1 and DC2 in the basement of the Solids Building. h. Install and commission a new Fats, Oils, and Grease (FOG) feed train to the new digester including a progressive cavity feed pump, flow meter, control valve, and piping from the Brown Grease Receiving Facility. i. Install and commission two new high-efficiency, condensing natural gas boilers, boiler loop pumps, associated hot water system piping, and valve modifications. j. Remove and replace the primary and secondary hot water system pumps, including associated hot water piping system modifications. k. Install and commission a new hot water recirculation pump for the FOG offloading screen non-potable water hot water system. l. Demolish the existing DC 2 electrical room air handling unit and condenser. Install and commission a new air handling unit and condenser and upsize the supply and return ductwork. m. Site improvements including, but not limited to, a new decant facility, site lighting, drainage improvements, irrigation sleeves, topsoil and compost, asphalt roadways and curb and gutter improvements. n. New motor control center, electrical panelboards, transformers, instrumentation, and associated conduits and conductors. o. Upgrades to the existing electrical, instrumentation and Supervisory Control and Data Acquisition systems necessary (equipment replacement or improvements) to support the modifications. p. Furnish and install related equipment, temporary items and systems, and other appurtenances necessary to complete the Work and to provide a complete and functional system in accordance with the Contract Documents. The Work Site is located at Durham Water Resource Recovery Facility, 16580 SW 85th Avenue, Tigard, Oregon 97224 (Site). The Work is a public works project subject to ORS 279C.800 to 279C.870. The estimated construction cost of the Work is $14,580,000. T For questions regarding technical and administrative issues, contact Owner: Stephen Waldron at 503.547.8134 or by email to waldrons@cleanwaterservices.org. All questions about the meaning or intent of the Bidding Documents are to be submitted to Owner via email. Additions, deletions, or revisions to the Bidding Documents considered necessary by Owner in response to such questions will be issued by Addenda and posted to Bid Locker. Questions received after October 10, 2025 at 2:00 p.m