Natural grasses are becoming firmly established on the old landfill site. About 80% of the disturbed surface is now covered with vegetation. This was no small task given the sandy gravel soil, strong dry winds, and southern exposure.
Horsethief Landfill cap showing erosion control features.
Environmental engineers perform air monitoring tests.
Lined channels inhibit erosion by water runoff from landfill cap surface. Columbia River in backgrou