The Penitencia Water Treatment Plant site was originally built on an ancient landslide.  The site has poor subsurface conditions including shallow groundwater and soft soils which create localized areas of instability.

Schnabel Foundation Company designed and installed soil nails, soldier beams and lagging, and secant pile wall shoring to help facilitate construction of new structures at the facility.  In addition, 1,150 vertical linear feet of drilled piers were installed to contain a smaller slide that developed during construction.  Performing the work in difficult site conditions, Schnabel installed over 20,000 sf of shoring that used over 600 soil nails and tiebacks.