HomeMy WebLinkAboutPublic Works Committee Minutes 12.12.2011 MINUTES
PUBLIC WORKS COMMITTEE
DECEMBER 12, 2011 5:30 P.M.
COUNCIL CHAMBERS
MEMBERS PRESENT: Chairman Mark Mace Chuck Rodgers
Tom Nelson
Dan Koch
Emelie Eaton
OTHERS PRESENT: Kelly Rhoads Kurt Markegard
Public Input: None
Sewer treatment plant upgrades:
Kurt stated that Great West Engineering designed a preliminary design report for upgrading the sewer
treatment plant. Kurt explained that the WWTP is well maintained but the RBCs (rotating biological
contactors) are not well- suited for pending ammonia and nutrient removal rules. The disinfection system
is unable to consistently meet E.coli and total residual chlorine requirements. Because no mixing zone or
dilution is allowed under the current regulatory framework, the city must provide full ammonia removal
to assure compliance with acute and chronic water quality standards for ammonia. It must also comply
with non - degradation load limits for total nitrogen and total phosphorous. Kurt explained that it is
recommended that the city provide full biological oxidation of ammonia to nitrate for the entire flow
using a three stage activated sludge process. The new process will also be designed for biological
phosphorous removal and significant reduction in nitrate to nitrogen gas. The existing RBC basins will be
expanded and modified to serve as stages 1 and 2 of the new activated sludge system. The city had
adequate anaerobic digestion capacity for both the primary clarifier solids and the waste activated sludge
expected at a maximum month flow. A new building will be constructed for the sludge thickening room.
Kurt stated that this project will cost about $5,999,000.00 to complete. The city received a $750,000.00
grant in 2007 that will be used toward this project. There will be a $6.00 capital improvement surcharge
per EDU added to the bills each month starting on the December billing, which will be used to cover the
cost as well.
Other tour of water treatment plant:
Kurt explained that Nathan and Tim will have new offices at the water treatment plant along with a new
lab. Tim will be moving from city hall down to the plant so he can supervise from there instead of at city
hall.
There will be a tour of the water treatment plant at the next Public Works meeting which, is scheduled for
January 9th, 2012. All who want to attend are asked to meet at the council chambers at 5:30 p.m.
The meeting was adjourned at 6:15 p.m.
Res.ectfully submitted,
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elly ' oads
Utilit �� : illing Clerk