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• Turbidity Meter: Turbidity range calibration will be performed prior to initiation of <br /> sampling activities, using turbidity gel standards of 0,4.4,45, and 483 NTUs. The <br /> meter is also checked daily during the sampling period with the standard most <br /> representative of the anticipated turbidity of the purged groundwater (typically 0 <br /> NTUs to 10 NTUs). If the reading varies by more than one unit between calibration <br /> checks, the meter will be recalibrated. Multiple physical conditions can cause <br /> variations in readings,including bubbles in the sampled water, wet or dirty sample <br /> containers, a wet or dirty lens, a wet or dirty optical sensor, or leakage of incidental <br /> light into the sample chamber. <br /> • Multiple Sensor Meter(pH Dissolved Oxygen Conductivity Temperature <br /> Turbidity): A multiple sensor meter may be used for multiple parameter <br /> measurements during sampling. Calibration will be performed prior to initiation of <br /> sampling activities, using manufacturer auto-calibration solution. If any of the <br /> readings are outside of the manufacturers specifications, the meter will be recalibrated <br /> for the parameter outside of the calibration range. Calibration checks will be <br /> performed daily. <br /> Equipment not listed herein will be calibrated according to manufacturers' <br /> recommendations and/or generally accepted practice. Calibration procedures will be <br /> documented for the project file. Instruments for which calibration cannot be easily <br /> checked will be either tested against another instrument of a similar type, or will be <br /> returned to the manufacturer for appropriate calibration. If tested against another <br /> instrument capable of making the same measurements, variation between instruments <br /> must not exceed five percent. If readings vary more than five percent, the instrument will <br /> 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 <br /> are ready for use, and that returned equipment is inspected, serviced, and returned to <br /> available inventory in a timely manner. Maintenance during use is the responsibility of <br /> the field team using the equipment. Calibration logbooks contain information on <br /> instrument maintenance,calibration, and repair. A separate logbook is maintained for <br /> each instrument. The paperwork will include a detailed listing of the item that was <br /> cleaned/replaced, and the make/model/serial number for the particular piece of <br /> equipment. <br /> 5 Geo-Logic Associates <br />