Photo 1. Infill is sprayed over the cellular-confinement system as installers rake the material into the cells. Cellular confinement tames near-vertical slope If you can’t move the hill, control it. Stuck with an awkwardly steep shale slope at the Jefferson County, Ala., solid-waste transfer station, engineers selected a cellular-confinement system to mitigate erosion. By Frank Hogan and William Zeinert C ONSTRUCTING JEFFERSON COUNTY ALA.'S new s

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