Consideration and Approval of Change Order No.  1:  Coconino/Elden/Humphreys 2010 Bond Improvements 

Approve Change Order No. 1 with Eagle Mountain Construction Co. in the amount of $102,671.16.

Approving this change order will authorize the contractor to repair substandard roadway and construct full depth asphalt pavement on Elden Street between Route 66 and Birch Avenue and on Coconino Avenue from Wilson Street to the west end. 

Maintain and deliver quality, reliable infrastructure.

This project is included in the Council adopted FY 12/13 Budget.  The Council approved the construction contract for this project on July 17, 2012.

Option No. 1 - Approve Change Order No. 1. This work includes removal of substandard base materials and construction of 4 inches of asphalt over 6 inches of aggregate base course in accordance with the current Engineering Standards.  This option is designed for a 20 year pavement life and will add 11 calendar days to the contract.

Option No. 2 - Deny Change Order No. 1 and direct the contractor to continue working in accordance with the approved plans and specifications.  This option includes a 2 inch asphalt overlay on top of the existing milled pavement.  Staff does not recommend this option because the pavement would likely fail with a few years and then require a full depth pavement replacement soon thereafter.  This option would likely cost more than Option No. 1 considering future pavement replacement costs and additional mobilization.

The original scope specified milling the existing asphalt pavement and a construction of a two-inch asphalt overlay.  After the milling operation was completed, it was evident that the remaining pavement and subgrade were in extremely poor condition.  This was unexpected as the borings from the geotechnical report did not indicate this condition.  

The existing substandard materials will be removed and replaced with new full depth pavement designed to meet a minimum 20 year life in accordance with the current Engineering Standards. 

The new pavement will last much longer, minimize future maintenance costs and minimize impacts to the neighborhood.   

INFORM - Construction progress updates have been provided to residents and property owners during this project.

 

INVOLVE - In April 2012, a letter describing the project and the schedule was sent to all property owners along Coconino/Elden and Humphreys requesting their cooperation in the project.  Several property owners contacted Staff to discuss their concerns and the plans were revised to meet many requests.

 

EMPOWER -  Voters authorized up to $16.5 million in general obligation bonds in November 2010.  The bonds are to fund street and utility infrastructure replacements.

Option No. 1 - Approve Change Order No. 1. This work includes removal of substandard base materials and construction of 4 inches of asphalt over 6 inches of aggregate base course in accordance with current Engineering Standards. This option is designed for a 20 year pavement life and will add 11 calendar days to the contract.

Option No. 2 - Deny Change Order No. 1 and direct the contractor to continue working in accordance with the approved plans and specifications. This option includes a 2 inch asphalt overlay on top of the existing milled pavement. Staff does not recommend this option because the pavement would likely fail within a few years and then require a full depth pavement replacement soon after. This option would likely cost more than Option No. 1 when considering future pavement replacement costs and additional mobilization.