Group Delta is a geotechnical engineering firm which specializes in geotechnical investigations, forensic investigations, env ... ironmental services, material testing and inspection, has offices located in Irvine, Torrance, Anaheim, Oakland, Ontario, San Diego, and Victorville. We have a staff of 125+ highly skilled professionals consisting of civil, geotechnical engineers, engineering geologists, scientists, laboratory and field technicians, deputy inspectors, drafting/CADD, drilling and support personnel specialized in their respective fields. In addition, we have licensed and experienced deputy inspectors and technicians specialized in their respective fields (including concrete, masonry, batch plant, fireproofing, shotcrete, soils, structural steel, non-destructive testing and welding) to provide construction observation and testing services. read more