Agenda - Public Works Committee - 03/21/2023

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Public Works Committee Meeting Date: 03/21/2023 By: Bruce Westby, Engineering/Public Works 5.4. Title: Consider Recommendation to City Council to Accept Bids and Award Contract for Improvement Project #21-09, Centralized Water Treatment Plant Purpose/Background: Purpose: Consider Recommendation to City Council to Accept Bids and Award Contract for Improvement Project #21-09, Centralized Water Treatment Plant. Background: In early 2019, the Minnesota Department of Health detected manganese concentrations above recommended health guidelines in several of Ramsey's city wells. Since then, the following actions have been completed. • Staff drafted a letter outlining the new manganese issue and the City's short and long-term plans to address the issue and mailed the letter on 5/15/2019 to 5,600 Ramsey households. • A public meeting was held at city hall to address concerns with residents. • Wells #5, 6 and 7 have been exclusively utilized since these wells have the lowest concentrations of manganese. Unfortunately, these three wells have the largest concentrations of Iron leading to increased rusty water complaints. • Wells #1, 3, 4 and 8 have Manganese concentrations above the MDH guidelines. These wells have only been utilized when water demand increases beyond the capabilities of wells #5, 6 and 7. • A Manganese hot line was established and Staff spoke to 88 concerned residents regarding Manganese and Iron in Ramsey's municipal water supply. • Several articles have been published on Facebook and in the Ramsey Resident • Monthly updates are being made to Ramsey's website regarding current Manganese concentrations. Staff collects and tests 15 random water samples monthly and publishes results on the City website. • SEH, Inc. completed a pilot plant study on Wells #3 and #4 to determine the correct filtering process to remove Manganese and Iron from Ramsey's municipal supply. • SEH, Inc. completed a water treatment plant Feasibility Study. • SEH, Inc. prepared final plans and specifications for the required raw and finished water trunk lines needed to serve the proposed water treatment plant. The plans were advertised for bids but all bids were rejected as they significantly exceeded the engineer's estimate. • AE2S prepared final plans and specifications for the proposed WTP and administered the bid process and will provide construction administration services upon award of the project to the lowest responsible bidder. The proposed City of Ramsey Water Treatment Plant (WTP) project generally consists of constructing a new 10 million gallons per day (MGD) gravity filtration WTP. In general; • Building construction consists of cast in place concrete and concrete masonry units. • Processes include a backwash reclaim basin, conventional dual -media gravity filters, a clear well, a reservoir, general process piping ranging in size from 3 to 30-inches, numerous valves, fittings, and appurtenances. • Chemical feed systems include chemical storage tanks, containment, and feed equipment for chlorine, permanganate, phosphate, hydrofluorosilicic acid, and polymer; high service pumps; general mechanical work including HVAC work, ductwork, drain, waste, and vent piping; and other mechanical equipment and appurtenances. • Electrical systems consist of electrical circuits and controls including lighting, power, instrumentation and controls, and associated conduit and wiring.