The approved 2022 Capital Projects Budget includes $1,783,000 for an intergovernmental painting and piping improvement project with the Northwest Water Commission (NWC), primarily located at the north 6-million-gallon water tank located south of the Nickol Knoll Golf Club. This project is part of multi-year comprehensive program to rehabilitate the Village’s water storage structures used for the potable water system. On February 21, 2022, the Village Board awarded a contract to the lowest responsible contractor, Era Valdivia Contractors, Inc., Chicago, Illinois, in the amount of $1,936,000 for this project.
 
Following the draining of the tank, a more thorough inspection of the structural members was performed, and multiple failures of the existing purlins were found. Purlins are installed during the construction of the tank as a temporary guide and support for the roof pieces of the tank, as they are installed. 

It is not uncommon for additional work related to water tank rehabilitation to be discovered once a full tank inspection is performed with the tank drained. A cursory inspection was completed with robotic equipment in 2018 and was used to develop the bid quantities and probable cost estimates.  
 
Staff and the consulting engineer have evaluated a few different options on how best to handle these failures. The recommended Change Order represents an improvement that provides the most structural integrity and is the most cost-effective course of action.

The total additional cost for repairs submitted by Era Valdivia is $96,492.70. The consulting engineer and Staff have reviewed the proposed Change Order and found it be appropriate and in alignment with industry standards. 
 
Funds for this additional cost are available as part of the original budgeted funding within the Water & Sewer Fund – Account No. 505-9001-571.50-25. (NWC will be funding approximately $550,000 of this project, which ensures that this project will ultimately be under the budgeted project funding).
 
RECOMMENDATION
 
It is recommended that the Village Board approve this Change Order #1, to Era Valdivia Contractors, Inc., Chicago, Illinois, for structural repairs to the North potable water tank at Station #13 in the amount of $96,492.70 and authorize Staff to execute the necessary documents.