THE CHALLENGE Repair an unstable slope by relieveing underlying moisture issues JOB OWNER City of Kelso, Washington ENGINEER Gibbs and Olson CONTRACTOR Nutter Corporation DATE OF INSTALLATION June 2018 The Old Pacific Highway is the original freeway section which runs parallel to the current Interstate 5. Nestled up in the hillside, a global stability issue created a slide of the natural slope and a large crack in the pavement section. This project was treated like a deep patch repair and initial repair strategies conceptually included the removal and disposal of the existing asphalt roadway and aggregate subbase, over-excavation of native subsurface soils to a depth anticipated between 2-6 feet, the installation of 4 layers of geogrid in combination of CSBC, and HMA surfacing.

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