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TABLE 3-2 <br /> AIR MONITORING FREQUENCY GUIDELINES <br /> Conduct periodic monitoring when:.(1) it is possible that an IDLH condition or a flammable atmosphere has <br /> developed or(2) there is an indication that exposures may approach permissible exposure limits or published <br /> exposure levels since the last monitoring. Look for a possible rise in exposures associated with these situations: <br /> • Change in site area- work begins on a different section of the site. <br /> • Change in contaminants -handling contaminants other than those first identified. <br /> 0 Change in on-site activity,-one operation ends and another begins <br /> • Handling leaking drums or containers <br /> 0 Working with obvious liquid contamination(e.g., a spill or lagoon). <br /> Conduct air monitoring when the possibility of volatilization exists (such as with a new monitoring well or a well <br /> containing known product). <br /> Conduct air monitoring on a well at a site known to have little contamination(documented by experience or <br /> laboratory data), only if an odor emanates from the well. <br /> Table 3-3 <br /> AIR MONITOR SELECTION DECISION TABLE <br /> Monitor. Excavation/ Excavating/ Manual Recovery <br /> Water Well Tank Soil Product System <br /> Sampling Installation Removal Sampling Recovery Installation <br /> Photo-ionization X -X X XO) 3 � <br /> Detection Meter <br /> Combustible Gas X Xaa <br /> Indicator, <br /> (1) Initially to determine readings in breathing zone. <br /> (2) Only required if subsurface trenching is required. <br /> f <br /> 6 <br />