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TO: Mayor Richard C. Irvin
FROM: Jason Bauer, P.E., Assistant Director of Public Works/Assistant City Engineer
DATE: September 4, 2018
SUBJECT:
Resolution authorizing the Director of Purchasing to execute Change Order Request Number 1 to the Contract with Swallow Construction, 4250 Lacey Road, Downers Grove, IL 60515 for the Tall Oaks Water Main Improvements - Phase 2, in Ward 1/Bohman.
PURPOSE:
To increase the Contract by $68,250 from the original value of $755,144.00 to a new Contract value of $823,394.00.
BACKGROUND:
This Change Order is necessary to increase the Contract value in order to account for unforeseen work items that were encountered in the field during construction. Change Order Request 1 is attached as Exhibit A, which details the changes for the project. The substantial changes are as described below:
The water main in the Tall Oaks subdivision has experienced a large number of breaks in recent years and as a result it has been completely replaced over the course of the last two years. The second phase of this project was installed directionally in an attempt to maintain access and reduce pavement restoration costs. Due to the limited entrances into the subdivision, the construction traffic caused unavoidable damage to the pavement. This significant expense was not anticipated, as very minimal pavement restoration was included.
An additional expense was stormwater related to include culvert stabilization and the restoration of the bank of the Indian Creek in the project area. As construction progressed, it was observed that the creek bed on a City owned parcel within the subdivision was severely eroded and was in immediate need of stabilization to eliminate a safety hazard; the bank was restored to the proper slope and stabilized with stone rip rap. Additionally at this location, the pavement was reinforced with concrete over the culverts due to pavement damage from the construction traffic.
Additionally, the water main through this area has been problematic as it relates to mapping and field locating; as such, additional water main connections were required to ensure proper service to the subdivision as well as each building within the subdivision.
Lastly, due to various unanticipated conflicts, certain sections of water main could not be installed directionally, which increased the amount of required landscape restoration, trench backfill and pavement patching.
DISCUSSION:
All utility projects include a degree of uncertainty due to unknown conditions that arise during construction. This project included a larger amount of such unknowns due to inconsistencies in the water mapping in this area; further, the restoration costs increased for various reasons including open cut installation of water main in lieu of directional methods in select areas, and additional pavement patching in areas where none was anticipated. These changes are required to complete the project in a manner consistent with the expectations of City residents. The $43,000 of required water main funds for this change order are available in account 510-4058-511-73-02 and there are also stormwater facility maintenance funds available from account 280-1852-512-81-90 for the creek bed stabilization and culvert reinforcement.
IMPACT STATEMENT:
Executing this change order will allow the City to compensate the Contractor for unforeseen work items that arose during construction and restore the affected areas to the proper condition upon completion of the project.
RECOMMENDATIONS:
I request the proposed resolution to be adopted.
cc: enter name of originating Committee
CITY OF AURORA, ILLINOIS
RESOLUTION NO. _________
DATE OF PASSAGE ________________
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A Resolution authorizing the Director of Purchasing to execute Change Order Number 1 to the Contract with Swallow Construction, 4250 Lacey Road, Downers Grove, IL 60515 for the Tall Oaks Water Main Improvements - Phase 2, in Ward 1.
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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 replacement of this water main was required due to multiple breaks over the past few years; and
WHEREAS, the changes to this contract were unforeseeable at the time of design and bidding; and
WHEREAS, adjusting the contract to include this additional work is necessary for the successful completion of the contract; and
WHEREAS, the City has dedicated accounts (510-4058-511-73-02 for the water main related improvements and 280-1852-512-8190 for the stormwater facility maintenance) with funds available for these improvements; and
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Aurora, Illinois, as follows: the Director of Purchasing is authorized to execute Change Order Request Number 1 to the Contract with Swallow Construction, 4250 Lacey Road, Downers Grove, IL 60515 for the Tall Oaks Water Main Improvements - Phase 2, in Ward 1.