New water plant with river view
by Mike Kroll
On Monday
night the Galesburg city council voted unanimously to approve the $17.5 million
bid of Canton's Leander Construction to build a new water treatment plant
adjacent to the city's current Oquawka pumping facility. Galesburg currently
operates multiple wells on the banks of the Mississippi River and a pumping
station that sends the water some 30 miles east to the existing treatment
facility on West Main Street. Once this new facility is completed in the spring
of 2010 all water treatment will be completed in Oquawka and the sand filters
and chemical treatment facilities in Galesburg will be decommissioned.
ÒWe will
still maintain the West Main Street facility,Ó explained public works director
Larry Cox, Òwhere we store water in two large ground tanks, conduct water
laboratory analysis and headquarter the water division. The older one of those
tanks holds five million gallons of water and will need to be refurbished soon
while the second newer tank holds four million gallons of water. The sand
filters at West Main Street that will be eliminated are already past their
useful life and we determined that it would be better for the pipeline to
conduct all water treatment in Oquawka.Ó
In recent
years the Galesburg City Council has been discussing serious problems with the
aging water system and especially the pipeline to Oquawka which has suffered
numerous leaks. That single pipeline is critical to providing water for the
city and engineers have determined that it is in serious jeopardy along a
specific section where leaks have been most common. It was determined that two
factors contributed to the excessive wear on the pipeline, excess pressure and
chemical corrosion. The chemical corrosion is due to the high amounts of
chlorine that are currently mixed with the water at Oquawka prior to pumping
east to Galesburg. By treating the water at Oquawka the necessary amount of
chlorine will be greatly reduced lessening both corrosion potential and
improving water quality or taste.
ÒThe city
recently purchased nearly 14 acres of farmland adjacent to our current Oquawka
property but at a higher elevation adjacent to the highway,Ó noted Cox.
Engineering drawings show that while the existing pumping station was
threatened during the severe flood in 1993 the new facility will be located
above the 500 year flood plain. The new facility was engineered by CTE
Engineers of Chicago and Cox says it is a near twin of a treatment plant the
firm did in Michigan about five years ago. CTE specializes in transportation
and environmental infrastructure and was instrumental in evaluating the four
bids that ware received for this project. Although the Leander bid is some
$600,000 higher than CTE's original estimated price that also includes rehabilitation
of the two gravel-packed wells that was scheduled but not originally included
in the scope of this project.
Earlier
projects addressing water division needs have already included refurbishing the
Ranney collector that is the principal source of water at Oquawka. ÒOur rehab
of the Ranney has been very successful and greatly improved its capacity,Ó said
Cox. The new plant will have a standard operating capacity of 12 million
gallons per day and its design affords the opportunity to expand that capacity
should the need occur according to Cox.
The water
treatment technology remains essentially the same as currently employed. The
raw water is chemically treated with chlorine to kill bacteria, phosphates are
added to address the continuing problem of many older Galesburg homes with lead
water services and the water is fluoridated. Additionally the chemically
treated water is mechanically filtered and aerated before it will be stored
temporarily in one of two one million gallon finished water storage tanks
on-site.
The entire
new plant will be automated and the cost of the new automation includes
replacement of the older automation currently in place at the pumping station.
Because of this automation Cox says that the two current Oquawka staff will
only need to be supplemented by the addition of a person splitting his or her
time between Oquawka and the Galesburg plant. The computer-controlled nature of
the new plant means that it can be both monitored and operated from Galesburg
most of the time.
Cox emphasized
that while this is the biggest water project yet tackled by the city it is only
an early stage in what will likely amount to a 30+ year long project. Once this
new plant is in operation the existing sand filters at West Main along with the
chemical storage tanks will be eliminated and the older five million gallon
ground storage tank will need to be refurbished. Soon thereafter two of the
city's aerial water tanks will need to be replaced on the south side of town
and at some point the huge project to repair and supplement the aging pipeline
itself needs to be started.
Current
plans for the pipeline are not to replace it but to construct a parallel
section of pipeline adjacent to the most problematic area that will permit
bypassing that section of old pipeline. Once this is in place the old pipeline
section will be repaired. The hope is to proceed in this manner until there is
an entirely redundant pipeline in place between Galesburg and the Oquawka
treatment plant. This redundancy will make pipeline maintenance easier and
greatly reduce the risk of catastrophic breech of the single pipeline. It is
also important to remember that the pipeline is still just one link in the
water distribution system. There is also the system of water mains, valves and
towers necessary to deliver water to each home and business.
Cox was
careful to note that while this seems like a huge endeavor it is really just
part of the necessity of ongoing maintenance of any critical infrastructure.
The Galesburg water system is aging and some parts of it are over 100 years old
now and nothing lasts forever. ÒThe scale and importance of this water system
means that this project will never be totally complete. As we finish project
after project the demands of time and maintenance will necessitate that
eventually each component part will again require our attention again and
again.Ó
3/20/08