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TO: Mayor Richard C. Irvin
FROM: Jason Bauer, P.E., Engineering Coordinator
DATE: March 26, 2018
SUBJECT:
A resolution to award the 30" CMP Storm Sewer Cured in Place Pipe Lining Contract located in Ward 1 to Benchmark Construction Co., Inc., 2260 Southwind Blvd., Bartlett, IL 60103.
PURPOSE:
To prevent the need for future excavation or maintenance of a 30" corrugated metal pipe (CMP) running through the Annunciation Cemetery established in 1875.
BACKGROUND:
The engineering division was notified in the fall of 2017 that the detention basin outfall for the Lora Lei Acres subdivision was performing inadequately. An investigation was conducted on the downstream pipe that included televising the sewer. A location map attached as Exhibit A shows the location of the downstream pipes. Immediately downstream of the subdivision within the Annunciation Cemetery is a 30" CMP that has a blind 45 degree bend and which is showing signs of deterioration including rust, small holes and dents. As the pipe exited the cemetery, it abruptly transitioned to a 12" plastic pipe that was found to be partially crushed by a rock. This break in the 12" pipe was found to be the cause for the recent upstream drainage issues. The City of Aurora Water & Sewer Maintenance Division promptly fixed the 12" damaged pipe and also installed a manhole at the transition from the 30" to 12" pipe. At that time it was determined that the 30" CMP should be lined to prevent further deterioration and the need to perform maintenance activities in the cemetery.
DISCUSSION:
Six bids were received, opened, and read aloud on March 14, 2018. The bid tabulation can be seen in the attached Exhibit B. An alternate bid was available which would have allowed a contractor to centrifugally spray a concrete liner onto the CMP in lieu of installing a Cured in Place Pipe (CIPP) liner. One alternate bid was submitted but is was nearly twice as expensive as the lowest submitted bid for installation of a CI...
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