Accreditations/Certifications, Pre-qualifications & Affiliations     ACCREDITATIONS/CERTIFICATIONS American Association of State Highway and Transportation Officials (AASHTO) Accredited for Aggregates and Portland Cement Concrete     Army Corps of Engineers Validated Laboratory for Aggregate and Portland Cement Concrete     Illinois Dept. of Transportation (IDOT) Approval Laboratory for Aggregates and Portland Cement Concrete PRE-QUALIFICATIONS State of Illinois Capital Development Board     Illinois Department of Transportation     AFFILIATIONS American Industrial Hygiene Association (AIHA) Proficiency in Analytical Testing (PAT) Program     American Conference of Governmental Industrial Hygienists (ACGIH)     AASHTO Material Reference Laboratory (AMRL) Aggregate Proficiency Sample Program     Cement & Concrete Reference Laboratory (CCRL) Concrete Proficiency Sample Program     American Concrete Institute (ACI)     American Society of Testing Materials (ASTM)     Associated General Contractors (AGC)     Mattoon Chamber of Commerce