Earth Systems Southern California is a part of the Earth Systems group of companies, which has been providing geotechnical engineering services for more than 30 years. The Earth Systems group of companies services include investigation, geophysical survey and environmental assessment. It deals in engineering geology and fault location studies. The group provides construction observation and material testing and evaluation services. It additionally offers environmental site characterization and seismic hazard response services. The group serves the education, energy, aviation, defense and commercial sectors. Its projects include Gavilan College, Edwards Air Force Base, Chumash Indian Casino and Resort and Estrellita High School. The group is a member of the American Wind Energy Association. Earth Systems Southern California maintains a location in Palmdale, Calif.