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TO: Mayor Thomas J. Weisner
FROM: Jason Bauer, P.E., Engineering Coordinator
DATE: September 20, 2016
SUBJECT:
To approve a change order for additional work on the Lincoln Avenue CIPP Contract in the amount of $74,000.00. This additional work is required to complete the contract that was awarded to Visu-Sewer of Illinois, LLC on March 22, 2016. This project is located along Lincoln Avenue from Spring Street to Superior Street in Ward 2.
PURPOSE:
This change order is required to facilitate the lining of the sewer; in the current state the sewer cannot be lined due to an uncontrollable amount of groundwater infiltration. When the contractor attempted to line the sewer earlier this year, there was a significant amount of flow in the pipe, which was only slightly reduced when the sanitary sewer flow was diverted to another sewer. Upon closer inspection, it was discovered that the flow was due to groundwater infiltration seeping through the joints. Two approaches were identified for controlling the groundwater seepage; de-watering or joint grouting. Due to the severe cracking in the pipe, not only was the cost of grouting higher than de-watering, but the contractor could not guarantee that it would completely resolve the issue. De-watering via the insertion of well points along the sewer line will be required to draw the water down to a level that will allow the liner to be successfully installed. This quote also includes any necessary restoration efforts required to backfill the de-watering locations. In addition to providing structural integrity to the pipe, this project will also reduce the groundwater infiltration and corresponding amount of clean water that is sent to Fox Metro for treatment. The location map is shown as Exhibit A and the change order is attached as Exhibit B.
BACKGROUND:
This section of sewer is deteriorated and lining will be required to avoid the high cost of replacing the sewer at depths up to 25 feet. An emergency repair was conducted in 2014 to replace a section that had collapsed; additional sections are on the verge of collapse, therefore lining is required at this time.
DISCUSSION:
This work will benefit the City due to the significant difference in cost between lining and full sewer replacement; full replacement can cost as much as $2,000 per foot, compared to this lining project which will be approximately $360 per foot, inclusive of this change order. The funds are available for this work in account 510-4063-511-73-14.
IMPACT STATEMENT:
This work will not significantly impact any other departments or the public. Traffic will be staged to maintain two lanes of traffic; at times when that is not possible, flaggers will be utilized to control traffic.
RECOMMENDATIONS:
I request the proposed resolution be adopted.
cc: Alderman Garza, Chairman
Alderman Johnson
Alderman Mesiacos
Alderman Bohman, Alternate
CITY OF AURORA, ILLINOIS
RESOLUTION NO. _________
DATE OF PASSAGE ________________
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A Resolution Approving a Change Order Increasing the value of the Contract for the Lincoln Avenue CIPP project with Visu-Sewer of Illinois, LLC by the amount of $74,000.
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WHEREAS, the City of Aurora has a population of more than 25,000 persons and is, therefore, a home rule unit under subsection (a) of Section 6 of Article VII of the Illinois Constitution of 1970; and
WHEREAS, subject to said Section, a home rule unit may exercise any power and perform any function pertaining to its government and affairs for the protection of the public health, safety, morals, and welfare; and
WHEREAS, the additional work is deemed necessary to allow for the successful lining of the sewer, and
WHEREAS, the sewer requires rehabilitation through cured in place lining to avoid the potential for failures and significantly higher costs associated with replacement of the sewer, and
WHEREAS, the contract will be increased in the amount of $74,000 from the original contract value of $280,188.00 to a new contract value of $354,188.00, and
WHEREAS, the additional funds required are available in the Sanitary Sewer Evaluation and Rehabilitation Fund, Account Number 510-4063-511-73-14.
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Aurora, Illinois, as follows: that the Change Order increasing the value of the Contract for the Lincoln Avenue CIPP project with Visu-Sewer of Ilinois, LLC by the amount of $74,000 is hereby approved.