Holt Engineering is committed to providing quality and accurate site inspections and construction materials testing services. Our firm is AASHTO accredited in ASTM “Standard Specification for Agencies Engaged in Construction Inspection and/or Testing”; ASTM C-1077 “Standard Practice for Laboratories Testing Concrete and Concrete Aggregates for Use in Construction and Criteria for Laboratory Evaluation and AASHTO R-18 “Standard Recommended Practice for Establishing and Implementing a Quality Management System for Construction Materials Testing Laboratories”. The accreditation means that AASHTO has determined that Holt’s Quality Control Systems which includes our laboratory procedures, field testing services, equipment and testing personnel are qualified to conduct specific construction materials testing services and laboratory testing.