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63 DATA LOGGING <br /> All monitoring data, including background readings, will be logged in the field log book <br /> The results of daily instrument calibrations can either be logged on the form provided in <br /> Attachment D or in the field log book All monitoring instruments will be calibrated in <br /> accordance with the manufacturer's instructions prior to the start of each shift <br /> Calibration should also be performed when inconsistent or erratic readings are obtained <br /> IF AN INSTRUMENT CANNOT BE CALIBRATED TO SPECIFICATION, OR BECOMES <br /> OTHERWISE INOPERABLE, ALL INVASIVE SITE WORK (I.E., DRILLING, EXCAVATING) <br /> WILL CEASE UNTIL THE INSTRUMENT IS APPROPRIATELY REPAIRED OR REPLACED; the <br /> PM or DSO should be contacted for further guidance <br /> 64 DUST CONTROL <br /> High winds and site operations can cause airborne dust hazards If site operations <br /> generate sustained visible dust, a water mist will be applied to reduce dust generation If <br /> the mist is not effective in reducing dust generation, personnel will don respirators (half- <br /> face or full-face as appropriate for analyzer readings) with combination organic vapor- <br /> HEPA cartridges (such as MSA's GMC-H cartridges) <br /> The sand and Portland cement which may be used in groundwater monitoring well <br /> construction, may contain free silica (quartz) Airborne exposure to silica dust may occur <br /> during handling of these materials Half-face respirators with HEPA cartridges should be <br /> worn for those sand and cement handling operations where there is a reasonable <br /> possibility for exposure to sustained airborne dust from the pouring and mixing of dry <br /> sand or cement <br /> AMFOREST 21 7 18 <br />