cover
TO: Mayor Richard C. Irvin
FROM: David E. Schumacher, P.E., Superintendent of Water Production
DATE: August 26, 2021
SUBJECT:
A Resolution Authorizing a Professional Services Agreement with Crawford, Murphy & Tilly, Inc., for bidding and construction observation services for the Normal Pressure System Master Meter Replacement Project in the not-to-exceed amount of $62,000 for the Water Production Division.
PURPOSE:
To obtain City Council approval to execute a professional engineering services agreement with Crawford, Murphy & Tilly, Inc. (CMT), Aurora, IL, for bidding and construction observation services for the Normal Pressure System Master Meter Replacement Project for the Water Production Division.
BACKGROUND:
All residents of the City of Aurora are provided with potable water from the city owned and operated Water Treatment Plant (WTP). The WTP was originally constructed in 1991 and began operation in 1992. The water treated at the facility is then pumped to two distinct and separate pressure zones, the normal and high pressure zones, which cover the entire City of Aurora.
All of the water that is pumped out to the Normal Pressure System (NPS) flows through one individual "master" flow meter which registers the amount of flow pumped to the pressure zone. This information is then used for multiple purposes such as reporting to regulatory authorities, monitoring quantities of water loss, and ensuring proper operation of the WTP's finished water pumps.
The NPS flow meter has been in constant operation since 1992, and over the past five years it has shown decreased measurement accuracy and precision. Accordingly, the WPD has hired several experts from the flow meter manufacturing company to inspect the meter and perform various types of repairs. Unfortunately, the electrical windings in the NPS master flow meter are no longer salvageable and the accuracy and precision of the meter is severely hampered. A temporary meter has been in use for se...
Click here for full text