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  • AMRL (AASHTO Materials Reference Laboratory), in conformity to the requirements of the AASHTO Accreditation Program (AAP), AASHTO R-18, ASTM D3740 and ASTM E329
  • CCRL (Cement and Concrete Reference Laboratory)
  • Caltrans
  • DSA (Division of the State Architect)
  • City of Los Angeles
  • Army Corp of Engineers