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0 <br />2.7.2 Calibration of Equipment and Materials <br />Before placing a piece of testing equipment into service, its accuracy must be established and <br />calibrated by the QA/QC Manager. Types of equipment requiring calibration include: nuclear <br />gauges, sand cone devices, sand to be used in sand cones, and scales. The calibration procedures and <br />frequencies must be as per manufacturer's instructions or ASTM standards. Whenever the <br />equipment is suspect or is producing questionable results, it must be removed from service <br />immediately and re -calibrated. <br />0 Page 11 <br />