Soil mixing with pozzolanic binders is widely used for the stabilization and solidification of a variety of wastes in environmental applications as well as for bearing capacity improvement, earth retaining structures, and slope stabilization in geotechnical applications. This paper summarizes a series of recent projects at the Seneca Meadows Landfill facility in Waterloo, NY that highlight a growing application of soil mixing; soft ground improvement beneath embankment slopes. Soil mixing at this facility has been used on three separate occasions over the last four years and will be used on an upcoming final phase of the work. The soil mixing performed at this facility is designed to improve the bearing capacity and shear strength of a very soft clay deposit to increase the stability of perimeter embankments during construction and placement of waste in the landfill. The design approach, construction processes, quality control, and lessons learned from these projects are discussed. Up to this point, the soil mixing at this facility has been successful as supported by the information collected during the completed projects.