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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 /> Page 10 <br />