Pavement Preservation Program Overview

Overview of City Roadway Network
The City of Mill Creek has 106 lane miles within city limits, which is about 875,000 square yards of pavement. The typical life expectancy of original pavement is about 30 to 40 years. City streets currently range in age from 10 years to 40 years. As pavement begins to deteriorate, the deterioration rate is not constant. While pavement holds up for most of its life expectancy, as it nears the end of its life, pavement life quickly deteriorates. The general concept of pavement preservation is that as pavement deteriorates, intervention is done at the proper time with some type of surface treatment that returns it to a like-new condition and extends the pavement life. The City's goal is to intervene before roads deteriorate in order to preserve City infrastructure.
Pavement Preservation Issue Summary
In summer 2016, the City of Mill Creek contracted with Snohomish County as part of its interlocal agreement to apply a chip seal treatment to preserve the roadway surface in Mill Creek's Wildflower and Mill Park Village neighborhoods. Shortly afterward, the Mill Creek Community Association contacted the City about concerns from its members over the use of the chip seal process for roadway surface preservation within the City of Mill Creek. Residents noted that the pavement surface was not even; the application of chip seal was not cleanly done, covering some curb cement or leaving gaps between the roadway and the curb; and in some instances, the application was uneven in the middle of the street, leaving lines. In addition, it was noted that during the application of chip seal in a portion of the Heatherwood West neighborhood in 2014, an unexpected rainfall occurred, which left some blotches in the pavement aesthetic.

While the structural integrity of the roadway was improved by the application of chip seal, the application has had undesirable aesthetic impacts to neighborhoods.

The City Council made the decision at its March 14, 2017, meeting to move forward with overlay work in four neighborhoods. The grind and overlay asphalt work in the Wildflower and Mill Park Village neighborhoods was completed in August 2017.
Two Heatherwood West neighborhoods, including 26th Avenue SE and the "Racetrack" area comprising 27th Drive SE and 28th Avenue SE, will eventually receive a grind and overlay treatment. Impacting the timing of this project is the fact that there is some storm water and pipe repair work that needs to be completed in this neighborhood. If the City does the pavement work before the storm water and pipe work, it would have to once again tear up the roadway to do the storm water and pipe repair work. To be fiscally responsible, the City is only going to tear up the roadway one time. Right now, the exact timing of the roadway repair is unknown, but the work will be scheduled as part of the City's Capital Improvement Plan that is developed this year and residents will be kept informed about the timing.
Long-term Planning
As part of the work plan for the 2017-2018 biennium, City staff will develop a comprehensive update to the City's Capital Improvement Plan (CIP). Among those projects, the City is exploring pavement preservation alternatives that help maintain the City's infrastructure in the most fiscally responsible manner. This includes an updated analysis of all pavement preservation needs, treatment options, costs and funding sources. In addition, measures will be instituted that ensure quality control of work performed by contracted and interlocal partners.

This CIP work and funding options will include significant opportunity for community input, as well as community participation in the prioritization of capital projects.