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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 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: 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.

The City opened bids for the scoping/CCTV work on April 19, 2017, and selected Ventilation Power and Cleaning, Inc. as the contractor. In a notification letter to residents of Mill Park Village and Wildflower on May 3, 2017, the City noted that the goal was for the grind and overlay work to occur in July or August 2017.

In anticipation of moving forward with the grind and overlay work in Wildflower and Mill Park Village, on June 7 tentatively scheduled the grind and overlay work with Snohomish County for the week of August 28 through August 31.

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

Wildflower and Mill Park Village
When the City reviewed the scoping/CCTV footage, it discovered what appeared to be some issues with the stormwater pipes. The City asked a third-party consulting engineer expert (Perteet) to also review the CCTV footage, and they identified that some of the pipes were indeed crushed, damaged, and in need of replacement.

In a letter to residents of Wildflower and Mill Park Village on July 11, the City shared the update and noted it is awaiting final recommendations from the outside consulting engineer and plans to present options to the City Council at the July 25 City Council meeting.

Perteet, an experienced infrastructure consulting firm, reviewed 7.5 hours of CCTV pipe video and more than 500 photos from the Wildflower and Mill Park Village neighborhoods. It categorized 146 segments of storm pipe functionality and life expectancy into three categories:
A. Immediate repair is needed.
B. Repair is recommended when the 20-year street overlay life cycle expectancy has occurred.
C. Pipes requiring no action.

Perteet prepared a recommendation that was provided to City Manager Rebecca Polizzotto on July 12. Its findings revealed that 13 segments of pipe needed immediate repair, spanning both neighborhoods. It was recommended that the City replace the entire pipe run (catch basin to catch basin) where each Category A pipe failure has occurred and that the pipe work take place during the dryer months of the year. The details on the storm water pipe issue for these neighborhoods are in the City Council agenda packet for July 25.

The Mill Creek City Council agreed at the July 25 meeting to proceed with grind and overlay of the pavement in the Wildflower and Mill Park Village neighborhoods. The Council relied heavily on residents at the July 25 meeting to provide input into the decision as to which project should take place first, as both paving and pipe work could not both be completed in the remaining construction season and dry weather is strongly recommended for both projects. The paving work, which will be handled by a Snohomish County contractor, is scheduled between Aug. 28 and Sept. 1. The pipe repairs will occur at a future date, to be determined as part of the City’s development of its new Capital Improvement Plan. The pipe work will result in patches on the new pavement. A letter was sent to residents of these neighborhoods on July 26 apprising them of the update.

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.