News

Water tank rehab to cost more than earlier estimates


COURIER-POST FILE
By Hannibal Courier-Post
Posted: Feb. 17, 2020 2:00 pm

HANNIBAL | A needed renovation of a water tank in western Hannibal will cost the Hannibal Board of Public Works about $65,000 more than was anticipated.

Citing “favorable variances within the water fund,” Mathew Munzlinger, interim general manager of the HBPW, said the HBPW could handle the project's higher cost and recommended it be undertaken.

“The project came in a little over what we had budgeted, but it is something that we need to do,” he said.

The HBPW Board agreed and accepted the low bid of $263,510 that was submitted by Hogans, Inc., of Van Buren, during its January meeting.

Adding an additional $30,000 to the project's cost will be the renting of pressure tanks to help meet normal demand s and maintain pressures typically seen throughout that service area during the renovation work.

“Overall $300,000 is what we are estimating we can complete the project for,” Munzlinger said.

Munzlinger added that the HBPW will work with the contractor to limit the need for the additional tanks.

“These tanks will not provide all of the necessary volume to meet all demands, but will aid in

reducing pressure swings that can be seen when operating with the pumps only,” Munzlinger wrote in a memo regarding the project. “The booster station serving this area was recently upgraded with a larger pump giving it adequate capacity to meet even fire flow demands with the tank out of service and a standby generator was added giving the station the ability to pump water in the event of a power outage.”

According to Munzlinger, the work on the tank, known as the Diemakers tank, should take 60 days.

“We're hopeful that in a month or so we would be without use of the tank because it is the only tank in that pressure zone,” he said, noting that the area served by that particular tank includes the medical campus.

The 250,000 gallon tank is located on Hannibal's western side, behind Spartan Light Metal Products on Highway MM. At approximately 165 feet it is the tallest tank in the HBPW water system.

Constructed in 1996 the tank has not seen any major maintenance since it began service.

“It is inspected yearly on the interior and about every five years we wash it out and get a full assessment of the interior's condition,” Munzlinger said.

The project will consist of a repainting of the interior and exterior, the addition of an antenna ring at the top of the tank, repair of an interior ladder damaged at some point by ice, and the installation of a tank mixer. “The antenna ring and mixer are something that we have included on the last two tank projects,” Munzlinger said. “We are seeing an increasing need for an attachment point whether it be for our own use, another city department's or entity's.

“The mixer helps with preventing water stagnation and icing. The stagnation issue is especially important as the transition is made from chloramine to free chlorine as a residual disinfectant later this spring.”

 

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