Petra Geotechnical is a consulting firm that provides environmental engineering services. It features a staff of licensed engineers, geologists, scientists, technicians and support personnel. The firm offers a range of geotechnical services, such as soil improvement, earthquake engineering and hydrogeologic investigation. Petra Geotechnical conducts geotechnical feasibility studies and liquefaction and slope stability analysis. It deals in seismic refraction, pavement design, landslide evaluation and geotechnical instrumentation solutions. The firm additionally offers litigation support, agricultural exclusion documentation and human health risk assessment services. It also provides remediation regulatory, compliance, and soil and groundwater sampling services. Petra Geotechnical maintains a location in Murrieta, Calif.