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Private consultant materials laboratories under contract with the LAB shall use staff certified by one <br />or more of the following: Caltrans, American Concrete Institute (ACI), National Institute of <br />Certification of Engineering Technologies (NICET), or other organization approved by the State of <br />California. <br />CORRELATION TESTING PROGRAM <br />The LAB participates in the Caltrans Reference Sample Program for aggregates, asphalt concrete, <br />soils, and Portland cement concrete. The LAB also participates in the AASHTO re:source <br />Proficiency Sample Program for aggregates, asphalt concrete, and soil. <br />Private consultant materials laboratories under contract with the LAB shall be required to provide <br />documentation of participation in a correlation testing program through AASHTO re:source, <br />Cement and Concrete Reference Laboratory (CCRL), and/or Caltrans. <br />MAINTENANCE OF LABORATORY AND TESTING EQUIPMENT <br />The LAB shall only use laboratory and testing equipment that is in good working order. All <br />equipment shall be calibrated at least once each year. All testing equipment must be calibrated by <br />impartial means using devices of accuracy traceable to the National Institute of Standards and <br />Technology. A decal shall be firmly affixed to each piece of equipment showing the date of the last <br />calibration. All testing equipment calibration decals shall be checked as part of the IAP. <br />Private consultant materials laboratories under contract with the LAB shall be required to provide <br />documentation to confirm that all laboratory and testing equipment is maintained as stipulated <br />above. <br />Page 8 of 25 Quality Assurance Plan 2019 <br />