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TO: Mayor Richard C. Irvin
FROM: David E. Schumacher, P.E.; Superintendent of Water Production
DATE: February 12, 2018
SUBJECT:
A Resolution Authorizing Well Maintenance Services for Well No. 26 for the Water Production Division.
PURPOSE:
To obtain City Council authorization for Layne Christensen Company (Layne), 721 W. Illinois Avenue, Aurora, IL, to perform all necessary services as described in this memorandum to return Well No. 26 to full operational and functional status.
BACKGROUND:
Well No. 26, located at 2026 Nottingham Drive, is a deep well drilled in the Ironton-Galesville sandstone aquifer. The pump and motor setting is at 925 feet below the surface of the ground. The well was previously capable of supplying approximately 1,700,000 gallons of raw well water per day.
In 2012 the well began to experience a problem with the water-bearing formation that transmits water into the well itself. The recommended course of action by Layne was to redevelop the water-bearing formation to sufficiently restore water flow into the well to maintain a safe pumping level and well discharge. Upon completion of redevelopment activities in 2013, the pumping yield was restored, but unfortunately, excessive amounts of sand were also being pumped from the aquifer. Sand pumping must be minimized to prevent damage to the pumping equipment and valves. To do so, the actual pumping capacity (gallons/minute) must be reduced for long-term operation. Layne proposes conducting a test pumping scenario whereby the new pumping capacity can be calculated and sand concentration can be observed. With this information, the proper sizing of new pumping equipment, i.e., motor, pump and column piping can be determined. The new pumping capacity is estimated to be 1,300,000 gallons per day based upon data extrapolation.
DISCUSSION:
The total estimated cost of all proposed work by Layne to restore Well No. 26 to operational status is $400,000.00. The major items required an...
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