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Mukilteo Slurry Seal

Slurry Seal Program

Slurry sealing is one of many effective tools in the City’s preventative maintenance program and is typically applied to residential streets that are in fair to good condition. In the summer of 2018, we extended the life of neighborhood streets by applying a slurry seal to more than 5 centerline miles of residential streets in the Harbour Wood/Whidbey Lane and Possession Bay Highlands/Faire Harbour neighborhoods. Slurry seal application can extend a street’s good conditions for 5 to 10 years by protecting the underlying surface from the effects of wear and weather. Many cities locally and nationally use this cost-effective strategy to preserve their neighborhood streets. This work was a part of the citywide Pavement Preservation Program funded by the voter-approved Transportation Benefit District.

We coordinated with the City of Edmonds through an interlocal agreement to complete a slurry seal on just over a half mile of their residential streets as well. For additional information, visit the City of Edmond’s Slurry Seal webpage at overlays.edmondswa.gov or check out our mailed brochure for details and a map of the area.

The slurry seal process

Slurry seal is a cost-effective way to resurface neighborhood streets and is used by many cities locally and nationally. This quarter-inch layer of water, asphalt emulsion, and coarse sand is typically applied to streets that are in fair to good condition. We completed work in phases over several months:

Phase 1 – Pavement repair
The contractor sealed cracks in the roads and repaired small areas of damaged pavement. The road remained open, but drivers may have experienced temporary delays.

Phase 2 – Construction preparation
Crews swept pavement surfaces and trimmed or removed any vegetation that infringed on the right-of-way. Crews made final repairs to pavement surfaces.

Phase 3 – Slurry seal application

Crews applied the pre-mixed slurry seal mixture to the surface of existing pavement from the rear of a truck. When the slurry seal is first applied, the material is brown and sticky and must have time to dry properly. This work required a one-day road closure.

Where did you complete the slurry seal?

Phase 4 – Post-construction cleanup
The new road surface has more friction and sheds some of the finer aggregate for a few weeks after application, creating a sandy surface. Work crews returned to sweep the streets approximately one week, one month and three months after application. In addition, crews repainted street markings.

How does the City of Mukilteo select streets for slurry seal application?
Mukilteo uses a Pavement Management System (PMS) to help recommend streets for resurfacing. The City monitors the condition of every street by having them visually inspected and rated every 2 years and those ratings are entered into the PMS. Based on the available budget for preservation, the system recommends a list of treatments to maximize the budget and maintain the highest overall street network rating. City staff then refine the list into manageable and constructible projects. Typically, streets rated as “good” or “very good” by the PMS are recommended for slurry seal.


If you have any questions, please contact Andrea Swisstack, City of Mukilteo Project Manager, at 425-263-8081 or aswisstack@mukilteowa.gov.

File: http://mukilteowa.gov/wp-content/uploads/2018_0615_SlurrySeal_Mukilteo_FINAL.pdf
Link: https://mukilteowa.gov/slurryseal/2018_0615_slurryseal_mukilteo_final/
File: http://mukilteowa.gov/wp-content/uploads/2018_0615_SlurrySeal_Mukilteo_FINAL.pdf
Link: https://mukilteowa.gov/slurryseal/2018_0615_slurryseal_mukilteo_final/
File: http://mukilteowa.gov/wp-content/uploads/2018_0615_SlurrySeal_Edmonds_FINAL.pdf
Link: https://mukilteowa.gov/slurryseal/2018_0615_slurryseal_edmonds_final/
File: http://mukilteowa.gov/wp-content/uploads/MSS_Postcard_PossessionBay.pdf
Link: https://mukilteowa.gov/mss_postcard_possessionbay/
File: http://mukilteowa.gov/wp-content/uploads/MSS_Postcard_WhidbeyLane.pdf
Link: https://mukilteowa.gov/mss_postcard_whidbeylane/
File: http://mukilteowa.gov/wp-content/uploads/MSS_Postcard_Edmonds.pdf
Link: https://mukilteowa.gov/mss_postcard_edmonds/

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