The 40 acre residential campus provides clinical and educational services to children and adolescents who are dually diagnosed with developmental disabilities/mental retardation and psychiatric/behavioral disorders. Construction involved the expansion of the existing gymnasium. After excavation had been completed for the new footings, engineers had noted voids under the existing footings. Soil borings showed a clay later 15 feet below grade that was settling so a helical pile system was designed to stabilize the entire north wall of the gym. Sheet piling was to be installed close to the existing structure so the helical piles were also used to prevent any settlement due to the vibrations associated with the installation of the sheet piling.