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Geotechnical Solutions, Inc. (GSI) is a full-service geotechnical engineering and testing consulting firm based in Irvine, California, incorporated in 1993. GSI serves residential, commercial, industrial, wireless, institutional, religious, and public works clients throughout Southern California, with extended service areas in Central California, Nevada, and Southwestern Arizona. GSI operates a certified in-house laboratory and applies state-of-the-art software for seismic evaluation, slope stability, foundation analysis, pile analysis, and liquefaction studies. GSI has completed over 8,000 projects since 1992, including more than 6,000 wireless telecommunications sites, and serves as the sole geotechnical consultant for the Diocese of Orange.

JL Donahue Engineering, Inc. is a geotechnical and seismic engineering firm founded in 2017 and based in Bend, Oregon. Led by Dr. Jennifer L. Donahue, it provides probabilistic and deterministic seismic hazard analysis, site response analysis, liquefaction and slope stability assessments, foundation design, and independent peer review for clients ranging from small businesses to major utilities. Dr. Donahue is an active researcher and member of post-earthquake reconnaissance teams, and serves on dam safety and ground motion advisory boards.

Full-service environmental, geotechnical, civil, and surveying consulting

Engineering stability for your future

Engineering the Future