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Pavement Preservation Options
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 fall 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 meeting to move forward with overlay work in four neighborhoods: Wildflower and Mill Park Village neighborhoods, as well as two Heatherwood West neighborhoods, including 26th Avenue SE and the "Racetrack" area comprising 27th Drive SE and 28th Avenue SE. See the full press release.

Neighborhood Updates on Grind and Overlay
This section will be updated regularly as grind and overlay work progresses.

Wildflower and Mill Park Village
While the City is committed to moving forward with grind and overlay work, the project timing is dependent on scoping/CCTV work to be completed in early summer, as well as the County’s paving work schedule. The City opened bids for the scoping/CCTV work on April 19, 2017. The City will now review bids to identify a contractor, and will proactively communicate with these neighborhoods about the timing of such work.

The goal is for the grind and overlay work to occur in July or August 2017. Work would be completed during the daytime on weekdays. There may be restrictions for residents to drive on the roadway or access their driveways during paving. Asphalt needs to cool down and harden, and this will take several hours.

In preparation for the grind and overlay work, residents must remove or trim back trees, plants and brushes that are encroaching on the roadway so that the grinder machine and paving machine can grind and overlay the roadway up to the edge of curb and gutter. This is necessary to ensure a smooth and linear paved roadway.

Heatherwood West Neighborhoods
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.