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• Photoionization(PID) field survey instrument(Photovac <br /> Microtip) or Flame-ionization (FID) field survey <br /> instrument (Foxboro OVA). <br /> 6.7.2 Toxicity Action Levels <br /> The toxicity action levels given below are set to comply with OSHA <br /> Permissible Exposure Levels and ACGIH Threshold Limit Values. Some of the more volatile <br /> motor fuels also contain some concentration of benzene. Gasoline averages approximately <br /> 1% benzene. Therefore, for motor fuels which may contain benzene, the action levels <br /> specified below are also set to comply with the proposed TLV of 0.1 ppm. These action <br /> levels are also adjusted for the relative response of common PID or FID instruments to <br /> motor fuel vapors. <br /> Respirators must be worn when meter readings averaged over 10 minutes equal or exceed <br /> the action level for upgrade to Level C PPE. Workers must be evacuated from the area when <br /> organic vapor concentrations exceeding respiratory protective equipment protection factors <br /> are encountered. <br /> TOXICITY ACTION LEVELS FOR GASOLINE <br /> (in ppm) <br /> Action <br /> Instrument Calibration Upgrade to Evacuate <br /> Gas Level C <br /> Photoionization meter` Isobutylene 3 60' <br /> (Microtip with 10.0 to 10.2 300" <br /> eV lamp) <br /> Flame-ionization meter Methane 5 100' <br /> (OVA-128) 500" <br /> X Photoionization instruments do not work and will not be used for work in high (>90%) humidity or rainy <br /> weather. <br /> • for workers wearing 1/2 face respirators. ** for workers wearing full face respirators. <br /> 80500000 H:U1EALTH%FNLHSP April 21. 1997 <br /> FEMA UST,Fr l Gcneric HSP 15 <br />