The project included the East T-Hangars, Tie Down Ramps, and FBO Buildings at the San Luis Obispo County Regional Airport. It entailed the construction of an access road parallel to Highway 227, vehicle parking on the airport side of the road, six rows of T-hangars for general aviation aircraft, and tie-down ramps and connector taxiways on both the southeast and northwest ends of the T-hangar area. Additionally, three fixed base operator (FBO) buildings were constructed to the northwest of the T-hangar areas. Both the T-hangars and the FBO buildings are pre-engineered steel-frame structures with metal siding. The buildings have conventional continuous and spread foundations, and concrete slabs-on-grade. The T-hangars are long narrow structures with interior partitions to separate the individual spaces. Earth Systems performed a soils engineering investigation for this project. The resulting report presented results of laboratory testing, conclusions regarding CBR testing and preliminary geotechnical recommendations for site preparation, grading, utility trenches, foundations, interior slabs-on-grade and exterior pedestrian flatwork, retaining walls, pavement sections, drainage around improvements, and observation and testing. During construction, Earth Systems certified inspectors and technicians performed grading observation and testing and special inspection of construction materials.