Department of Utilities
Reference: Award of Formal Solicitation 8.3 MG Tank Effluent Line & Check Valve Project RFP# 17-053
To: Mayor Richard N. McLean and Members of City Council
Through: Philip Rodriguez, City Manager
Prepared By: Curtis Bauers, Director of Utilities
Date Prepared: November 20, 2017
PURPOSE
Requesting City Council approval of a formal solicitation for the 8.3 MG Tank Effluent Line & Check Valve Project to the most responsive and responsible bidder, and approving the resolution giving the Mayor authority to sign the contract. Municipal Code Section 3.08.090, ". . . . All bids and proposals in excess of $50,000 shall be awarded through formal written procedures by the city council."
BACKGROUND/HISTORY
The City currently operates three potable water storage tanks at their south tank site, just south of Bridge Street and east of Tower Road. The two ground tanks in this location are the entrance point to the City's water distribution system and are under constant review from CDPHE to ensure all old and new water quality parameters are being met. CDPHE conducted a Disinfection Outreach and Verification Effort (DOVE) audit on February 8, 2017 and notified Brighton in a letter dated March 2, 2017 that a new backflow prevention device is going to be required on the effluent line of the tank. This backflow prevention device must be installed while the Green Sands Filtration Plant is off-line, and must be completed prior to restarting that plant next spring. The 8.3 MG tank is the largest in the City's distribution system and not being able to use the tank for chlorine disinfection contact time (CT) calculations from the Green Sands Treatment Plant would require us to inject more chlorine into the system, leading to higher levels of disinfection byproducts, which are potential carcinogens.
Because of the high importance, the City staff determined that using a Design/Build approach is the most beneficial and would allow the project to b...
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