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Asphalt Road Repair in Mercer Island, WA

Challenge

Matvey Foundation Repair completed foundation repairs to this Mercer Island home.  While on site, a structural engineer recommended additional repairs to be done on a 80′ x 7′ wide failing hillside asphalt road.  Severe erosion was the cause of the road failure.

Solution

A structural engineer recommended placing 80 2″x20′ pin piles to stabilize the hillside.  Pin pile driving is an alternative method of retaining wall construction, soil stabilization, and foundation footing.

Overall, 80 2″ pin piles were placed at 21’ deep, 25 15’ long x 5’ deep wall anchors, the crew installed a curtain drainage system to re-route water from along the hillside to the base of the hill.

The project was completed on time and on budget.  Road width was increased to 10’ 6” and was left ready for asphalt 4” overlay.

Severe erosion of driveway before project.
Second angle of driveway erosion before project.
Pin pile holes pre-drilled 5′ deep.
Driving piles with PD140.
Driving 21″ pin piles in pre-drilled holes.
All piles driven and complete.
Setting ground contact pressure treated timbers in place.
Flush cut all piles to top of pile wall.
Soil removed off-site, ready for structural fill.
Delta drain barrier to re-route all water to base of wall.
5/8″ minus structural fill compacted in 4″ lifts.
Wall completed. Compacted structural fill in place.
Schedule Free Inspection
Service area of Matvey Foundation Repair

Service Areas

Seattle Office

18915 16th Ave S
SeaTac, Washington 98188

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