With offices in San Antonio and Corpus Christi Rock Testing has the facilities to assist you with your professional engineering needs. We specialize in geotechnical soil work and testing. Geotechnical engineering and construction material testing. We have been included in some of the following project categories: Subdivisions/Industrial Refinery/ Schools-Universities/Churches-Chapels-Temples/Hospitals/Office Buildings/Roads and Bridges/Strip Malls/Strip Centers/Parking Lots/Paving/Hotels/Motels RETL investigates soil and rock support systems for buildings, bridges, dams, and many other structures. Rock Engineering tests and monitors the quality of material mixes used for construction, and designs asphaltic concrete mixes for construction and soil stabilization methods.