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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 <br /> situations <br /> 0 Change in site area- work begins on a different section of the site <br /> 0 Change in contaminants -handling containinants other than those first identified <br /> 0 Change in on-site activity - one operation ends and another begins <br /> 0 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 <br /> well 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 /> . ATR MONITORING DEVICE 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 <br /> Detection Meter X X X X <br /> Combustible Gas <br /> Indicator(,) X X�z� <br /> (1) Initially to determine readings in breathing zone <br /> (2) Only required if subsurface trenching is required <br /> 11 <br />