Multiple prime design delivery system for construction of new elementary and middle school buildings. The building foundations experienced cracking due to expansive soils beneath the slab-on-grade foundation design. School district conducted review and determined that the pre-design subsurface investigation by the geotechnical engineer was insufficient and should have discovered the expansive soils and recommended against slab-on-grade foundation. Remedial plan consisted of driving structural steel columns from foundation into bedrock 20 feet below grade. Claim by School District for inadequate geotechnical investigation and increased construction costs exceeded available design professional insurance.