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04ARCADIS <br /> file. Instruments for which calibration cannot be easily checked will be either tested against <br /> another instrument of a similar type, or will be returned to the manufacturer for appropriate <br /> calibration. If tested against another instrument capable of making the same measurements, <br /> variation between instruments must not exceed five percent. If readings vary more than five <br /> percent, the instrument will be returned to the manufacturer for calibration. <br /> Scheduled periodic calibration of testing equipment will not relieve field personnel of the <br /> responsibility of employing properly functioning equipment. If equipment malfunction is <br /> suspected, the device will be removed from service, tagged so that it is not inadvertently <br /> used, and the appropriate personnel notified so that re-calibration can be performed, or a <br /> substitute piece of equipment can be obtained. <br /> Equipment Maintenance <br /> Maintenance responsibilities for field equipment are coordinated through an instrument <br /> technician who is responsible for ensuring that available equipment and instrumentation are <br /> ready for use, and that returned equipment is inspected, serviced, and returned to available <br /> inventory in a timely manner. Maintenance during use is the responsibility of the field team using <br /> the equipment. Calibration logbooks contain information on instrument maintenance, calibration, <br /> and repair. A separate logbook is maintained for each instrument. The paperwork includes a <br /> detailed listing of the item that was cleaned/replaced, and the make/model/serial number for <br /> the particular piece of equipment. <br />