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reading varies by more than one unit between calibration checks, the meter will be <br /> recalibrated. Multiple physical conditions can cause variations in readings, including bubbles <br /> in the sampled water,wet or dirty sample containers, a wet or dirty lens, a wet or dirty optical <br /> sensor, or leakage of incidental light into the sample chamber. <br /> • Multiple Sensor Meter(pH, Dissolved Oxygen, Conductivity, Temperature Turbidity): A <br /> multiple sensor meter may be used for multiple parameter measurements during sampling. <br /> Calibration will be performed prior to initiation of sampling activities,using manufacturer <br /> auto-calibration solution. If any of the readings are outside of the manufacturers <br /> specifications,the meter will be recalibrated for the parameter outside of the calibration <br /> range. Calibration checks will be performed daily. <br /> Equipment not listed herein will be calibrated according to manufacturers'recommendations <br /> and/or generally accepted practice. Calibration procedures will be documented for the project <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 used, <br /> and the appropriate personnel notified so that re-calibration can be performed or a substitute <br /> 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 <br /> using the equipment. Calibration logbooks contain information on instrument maintenance, <br /> calibration,and repair. A separate logbook is maintained for each instrument. The paperwork <br /> will include a detailed listing of the item that was cleaned/replaced, and the make/model/serial <br /> number for the particular piece of equipment. <br /> 5 <br /> DfferwardSAplan.doc <br /> Geologic Associates <br />