Approval for final payment in the amount $77,999.19, to Rosscon, LLC, for completion of the SE Zone Mill and Overlay Project No. 2023027, or take other necessary action. (Mike Stewart)
BACKGROUND:
As a part of the CIP Projects- Street Rehabilitation, the SE Zone Mill and Overlay has been completed. This project was successful. Due to the type of roads in the SE part of the City, there was not a large number of streets on the Mill and Overlay portion; however there will be a large number that will be leveled-up and micro-sealed. Many of the roads in this area are chip-seal streets, and milling them off can lead to unwanted consequences; therefore a micro-seal is a viable alternative for several streets in this area.
A mill and overlay is a maintenance process in which the top layer of asphalt is removed and replaced with existing asphalt. This is not a total reconstruction. A total reconstruction is when the base and sub-base are removed entirely, and the road is completely rebuilt. This process is very expensive and takes much more time than a mill and overlay. Staff wants to point this out in the background of this item due to a small number of sub-base failures that have arisen during the process, particularly on Cherokee Street from the intersection of Kalamazoo to the intersection of B St. The sub-base failures are part of road maintenance and a mill and overlay will often show those. They can be repaired by City staff after the project is completed. With that being stated, over 95% of Cherokee St did not suffer sub-base issues and the road was rehabilitated to a condition that it has not been for decades. Sub-base issues fall to the City staff to correct and are in no way a reflection of the contractor or asphalt manufacturer.
In summary, Augusta, Gulick, Cherokee, Sallie and Kalamazoo have been rehabbed and are in the best condition they have been in for a long time. The contractor worked diligently with the City to ensure the asphalt passed specifications and did do some removal and replacement work to ensure a high quality final product, this was done at no expense to the City. It is important to remember that the SE Zone rehabilitation is still on going, the Mill and Overlay portion is complete but many more miles of streets are going to be rehabilitated in the coming months.
This project was originally for $1,663,539.92 with $150,000 in contingency. This project did come in under budget due to quantity underruns. Overrruns and underruns are completely standard for this type of work.