Finance Committee - 2/21/2018 Page 18
MOTION CARRIED
From: Dan Kooken, Purchasing Manager
Re: Digester Cleaning Project - Change Order #2 (Value: Not-To-Exceed $100,000)
MOTION BY ALDERWOMAN KELLY TO ACCEPT, PLACE ON FILE AND APPROVE CHANGE ORDER #2
TO THE CONTRACT WITH DENALI WATER SOLUTIONS IN AN AMOUNT NOT-TO-EXCEED $100,000.
SOURCE OF FUNDING IS DEPARTMENT 169, WASTEWATER
ON THE QUESTION
Mr. Boucher
The digester cleaner project started back in November. There’s two digesters. There’s a 250,000 gallon
secondary digester and a 1.3 million gallon primary digester shaped like a big egg. They hold sludge, heat
sludge so it breaks down so there’s less sludge to haul out. Every so often you have to drain these tanks and
clean them out and inspect them. They need repairs inside and out. It has taken a little longer than expected.
There were some storms that set up back. | don’t believe this is going to be the last change order on it
unfortunately but it is nearing completion. The egg is drained. We're looking at some of the charges coming in
for this company to dewater the sludge out and drain the tank. The tank is drained, but they still have to
dewater while we do some repairs on valves. This is to pay for some of that dewatering and trucking fees that
are involved. Whether the $100,000 will cover the project, | don’t believe it will. We just found out a little while
ago that it probably won’t so that’s just a heads up. But that’s what this is for, to clean out these eggs.
Alderman Klee
Is this part of typical maintenance? Is this one of the things not done on time?
Mr. Boucher
| won’t say not done on time. Some of the valves that are associated with part of this should have been
replaced sooner, should have been on a maintenance schedule. But the egg, itself, the last time it was done |
believe was 2005. It’s probably gone on a little longer, but we’ve looked inside and the interior looks good.
These are also the tanks that generate the methane gas that we also use as a gas to heat some of our facility.
The tanks are in good condition. Could it go ten years? | don’t know; it probably should be done sooner to
inspect inside. There’s a lot of piping and equipment inside the tanks. Mostly the exterior stuff is stuff that
could have been checked sooner.
Alderman Klee
Will this be part of your regular maintenance?
Mr. Boucher
Yes, it will be. All of the valves will be.
Alderman Caron
In the letter, it said you thought you would be done February 3" so it’s not complete.
Mr. Boucher
No, it is not.
