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  • AMRL (ASSHTO 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(the Department of the State Architects)
  • City of Los Angeles
  • Army Corp of Engineers