Terra follows a well-structured Quality Assurance and Quality control program that audits every step of laboratory and field procedures. Terra meets the requirements of ASTM Standards E329 -Materials, C1077-concrete, D3750 -Soil and Rock and D 3666-Bituminous.
Our QA/QC program includes strict guidelines for:
All our technicians regularly undergo in-house training and refresher programs.
Terra participates in the following Proficiency Sample Program instituted by AASHTO Material Reference Laboratory (AMRL), Cement and Concrete Reference Laboratory (CCRL) and Texas Department of Transportation (TxDOT).
Annually two (2) samples of each material are distributed to over 500 laboratories in the US and abroad and are tested as per ASTM standards. Once all the test results are received at AMRL or CCRL, average and standard deviation for each ASTM test is calculated. Each laboratory is rated based on how much the specific laboratory’s test result deviates from the average.
Terra maintains accreditation with AASHTO Material Reference Laboratory (AMRL) and USACE.