Geo-Hydro provides geotechnical engineering, construction materials testing, special inspection, and environmental consulting ... services throughout the southeastern United States. Offices in Atlanta, Lawrenceville, and Athens, GA, and Greensboro and Charlotte, NC. Geo-Hydro Engineers is certified by the Corps of Engineers, CCRL (concrete), AASHTO (soils & asphalt), the Georgia Concrete Advisory Board, and the Georgia DOT. Geo-Hydro meets ASTM E329, Standard Specification for Agencies Engaged in the Testing and/or Inspection of Materials Used in Construction. read more