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TO: Mayor Thomas J. Weisner
FROM: David E. Schumacher, P.E.; Superintendent of Water Production
DATE: October 30, 2014
SUBJECT:
Resolution to authorize a Professional Services Agreement for the design and construction observation of the Water Treatment Plant Roofing and Skylight Replacement project for the Water Production Division
PURPOSE:
To obtain City Council approval to attain a professional engineering services agreement with Cordogan Clark & Associates, Aurora, IL (CCA) for the design and construction observation of the Water Treatment Plant Roofing and Skylight Replacement project for the Water Production Division.
BACKGROUND:
The Aurora Water Treatment Plant (WTP) was originally constructed in 1992 with an expansion occurring in 2002. The original WTP building is approximately 49,000 square feet and the roof over this portion of the WTP is a single-ply EPDM fully-adhered membrane. This membrane is placed on top of sloped polystyrene insulation material. While the membrane has lasted and performed well for the last 22 years, it is nearing the end of its useful life. Also, four large barrel-vaulted skylights are in need of refurbishment or replacement.
DISCUSSION:
The roofing which exists at the WTP protects not only the treatment plant area, but also the laboratory and office spaces located at the facility. As the roof system has aged, the membrane has become unattached and has begun to "billow" at several locations. Also, numerous leaks at many locations throughout the WTP have developed over the past ten years. The quantity and frequency of the leaks has increased as the membrane continues to be broken down by the elements.
If they can be located, the WPD does patch the leaks as they generate, but this has proven to be very difficult at times. When holes develop in the membrane, water passes through, gets onto the sloped insulation material, and can travel for quite a distance prior to actually leaking into the i...
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