Town of Twisp - Biosolids Dewatering and Lift Station No. 2 Improvements (Re-Bid)

See below for Project Description


Bidding Closed

Prebid Date10/25/21 10:30am

Bid Date11/4/21 1:00pm

Company & Contacts

Varela Engineering & Management

(509) 328-6066
Jeff Moran  
Kurt Holland


Twisp, WA

Project Estimate: Schedule A – $906,695.00; Schedule B – $454,000.00

Bidders may download electronic files at no cost. Printed documents are available, at Bidders expense, by choosing the “Order” option.
There is a tentative Pre-Bid Conference scheduled for October 25, 2021 @ 12:30pm. Additional information will be provided at a later date on the Varela Plan Room website.

The Project includes construction of the Screw Press Dewatering Addition, Lift Station No. 2 Improvement’s, and Pre-Engineered Metal Building. Major elements of work generally include:

Schedule A: Biosolids Dewatering
The work generally consists of the following elements:
• Construction of an approximate 1150 sf cmu and/or wood frame addition to the existing dewatering
building for biosolids storage. Addition includes under slab piping, and electrical improvements
• Removal of existing dewatering equipment including associated pumps, piping, concrete supports,
electrical and controls
• Installation of new Owner Furnished Contractor Installed (OFCI) mechanical dewatering
equipment package – OFCI equipment package includes mechanical dewatering equipment,
shaftless screw conveyors, polymer mix and injection system, and electrical and controls panels.
Installation includes some exposed and below slab piping modification
• Removal of existing polymer injection system and associated piping and controls.
• Replacing existing non-potable water piping, and installation of vfd for existing pumps,
reinstallation of existing chemical injection pumps, new flow pacing flow meters, controls and

Schedule B: Lift Station No.2 Improvements
The work generally consists of the following elements:
• Temporary bypass pumping of wastewater for the duration of construction
• Abandon and demolish an existing underground generator structure including salvage of existing
• Removal of existing electrical panels and equipment, pumps, piping and valves from an existing
underground drywell pump structure, including salvage of existing equipment
• Installation of new pump system, equipment, piping and valves inside an existing underground
drywell pump structure
• Associated electrical improvements and backup generator.
• Construction of an approximate 345 sf masonry and wood frame structure to house the pump station
electrical power and control panels, water supply and emergency standby generator
• Site improvements including replacement of existing chain link fence, double leaf gate, storm
drainage drywell and swale, site grading, hydroseeding and gravel surfacing