Title
143rd Street and LaGrange Road Intersection Improvements - Contaminated Soil - Brothers Asphalt Change Order
History
At the March Committee and Board meetings, an item was prepared and presented allocating $20,000 for Environmental Engineering Oversight by V3 Companies to address suspected contaminated soils that may be found during the course of the watermain relocation project. When that item was presented, the Committee was advised that quantities and costs were being compiled for the related construction costs associated with the investigation, excavation, transport and disposal of the contaminated soils that were going to be excavated.
Following soil samples taken and analyzed from the four corners where contaminants were suspected and the recent removal of the “Orphan Tank” at the 7-11 site, it is the belief of the Engineers that the extent of contamination may be greater than what had been earlier anticipated. The “Orphan Tank” removal was a very successful project, but it did show that there is significant contaminated material that must be dealt with.
The scope of the work involved in the management of contaminated soils is limited to the soils and water that must be removed during the course of the watermain relocation excavation. Contaminated soils excavated must be handled specially and any ground water that has to be pumped out to dewater the construction site must also be tanked to a licensed disposal facility. Additionally, to ensure that the contaminants do not deteriorate the gaskets and sealants used to join the pipe and valve sections, special gaskets (made to order) must be purchased and installed on the pipe and valves within the areas of contamination. If the special materials are not used, the seals will quickly deteriorate, leading to premature leaks and system failures.
Counsel has been working closely with Engineering in an effort to ensure that the Village’s ability to recoup these added costs is positioned as best as conditions will allow. As such, daily diaries are being kept to pinpoint the source of all excavated material that is determined to be contaminated. A chemical analysis of the contaminated material is performed in an effort to obtain the “chemical signature” that may help identify the “owner” that caused the contamination. If the “owner” can be determined, Counsel may then proceed with efforts to recoup costs incurred as a result of their contamination or release of pollutants.
As this handling of contaminated materials is federally mandated, the work must be performed using very specific criteria and with great oversight and review.
Costs associated with this contaminated materials work are estimated to be at or below $350,000. If all of the material that is excavated in the four areas of suspected areas of contamination is indeed contaminated, the costs will be at the upper-end of the estimate. If the extent of contamination is less than the most extreme estimate, then the costs will be lower than the estimate. In any event, this work is a requirement that must be closely followed.
It is important to note that an additional portion of these same areas will be excavated during the construction associated with the burial of the overhead utility lines. It is anticipated that the contaminated soils matter will be a concern, however, as the sites will have been better defined as a result of this phase of the project, additional costs will be more predictable. The final phase that will widen the roadway will have excavation occurring in these areas of now-known contamination, but typically the roadway excavation should not be deep enough to unearth contamination that would require special handling.
Therefore, it is Staff’s recommendation that a Change Order with Brothers Asphalt be authorized in the amount of $350,000 to fund the added costs associated with the discovery, excavation, transport and disposal of contaminated soils found as a part of the watermain relocation project at 143rd Street and LaGrange Road. With the authorization of this Change Order, the value of the contract with Brothers Asphalt will increase to $1,552,739.
On May 3, 2010, this item was reviewed and approved by the Public Works and Engineering Committee and referred to the Board for approval.
INFORMATION PREVIOUSLY PROVIDED AS PART OF THE MAY 3, 2010, PUBLIC WORKS AND ENGINEERING COMMITTEE PACKET.
Financial Impact
The Fiscal Year 2010 Water & Sewer Fund budget included $1,233,482 for the 143rd Street and LaGrange Road Watermain Replacement project. The original Brother’s contract amount was $1,202,739; therefore, a budget adjustment in the amount of $320,000 is required.
Recommended Action/Motion
I move to approve authorizing a Change Order to a contract with Brothers Asphalt for 143rd and LaGrange Road Watermain Relocation Project in the amount of $350,000, thereby increasing the total contact value to $1,552,739;
And
Approve a budget adjustment to the Water & Sewer Fund in the amount of $320,000;
And
Approve authorizing the Village Manager to execute the Change Order.