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TO: Mayor Richard C. Irvin
FROM: David E. Schumacher, Superintendent of Water Production
DATE: July 9, 2018
SUBJECT:
A Resolution Authorizing Maintenance Services for River Intake Screen No. 2 for the Water Production Division
PURPOSE:
To obtain City Council authorization for Evoqua Water Technologies (Evoqua), Chalfont, PA, to provide necessary field installation services and replacement parts to rehabilitate the subject River Intake travelling screen.
BACKGROUND:
The Aurora Water Treatment Plant (WTP) utilizes raw water from both wells and the Fox River. The raw Fox River water is pumped to the WTP from the River Intake building, 1100 Aurora Ave, which was constructed in 1991. As part of the initial treatment of the raw Fox River water, fine screening is provided to the raw water to remove large particles (sticks, leaves, etc.) immediately upstream from the river intake pumps. This is performed to prevent damage to the pumps from the large materials.
The River Intake building has two separate travelling screens which have been in constant operation since 1992 (26 years). As with all mechanical moving equipment, maintenance and replacement of wear parts is necessary to keep the equipment in proper operation.
DISCUSSION:
The Water Production Division performs regular routine maintenance on both travelling screens as prescribed by the manufacturer. While this work has been performed over the life of the units, some of the wear parts have worn to the point where maintenance will no longer be satisfactory for proper operation and the parts must be replaced. The work to install these replacement parts requires removal of the thirty foot tall total screen units themselves via a large crane and the highly detailed work to install the replacement parts is beyond the capabilities of the WPD maintenance staff.
As such, the WPD contacted the original manufacturer of the units, Evoqua, and received an onsite inspection and subsequent list of the required...
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