75th St Wastewater Treatment Facility Nitrogen Upgrades Project - City of Boulder RFB-27-2015

City of Boulder » RFB-27-2015

The information below is a summary of solicitation number RFB-27-2015 posted by City of Boulder.  As a reminder, this solicitation is closed and responses are no longer being accepted.

75th St Wastewater Treatment Facility Nitrogen Upgrades Project

Date Issued: 04/17/2015

Deadline: 05/08/2015  prior to 2:00 PM   M.D.T.

Requisition Number:

Delivery Point: see BID

Delivery Date: See BID

Type of Purchase: Term: Unspecified

Construction Related: Yes

Type of Response Allowed: Hard Copy Only

Issuing Agency: City of Boulder

Using Department: Utilities Division

Special Notices: Bid Bond Required
Insurance Required
Labor and Materials Bond Required
Performance Bond Required
Prebid Conference Mandatory on 04/23/2015 10:00 AM at WWTF Dewatering Conference Room, 4049 75th Street, Boulder


The primary elements of the project, identified as base bid items, include aeration basin modifications (structural, mechanical, electrical, and controls upgrades to reconfigure three existing MLE process basins to a 4-stage Bardenpho process), and construction of a new external carbon storage and feed (ECSF) facility housing three 6,000 gallon holding tanks for acetic acid and brewery waste. The new ECSF Building is a one-story process building, internal dimensions of 30 feet by 50 feet (1,500 sf). A final base bid element is to replace the existing membrane tube diffusers in the existing solids contact tanks (SCT) with ceramic disc diffusers. In addition to the base bid elements, three bid alternates are included: 1. Conversion of an existing 70-foot diameter predewatering storage tank to a post aerobic digester (PAD) to decrease the ammonia concentration in centrate (mechanical, electrical, controls, and minor structural modifications), 2. Improvements to the existing centrate return control strategy, and 3. Addition of a bypass pipeline (18-inch diameter) around the primary sedimentation tanks. 


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