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5. Prepare incident report and submit to HSO. <br /> 507.10 VAPOR MONITORING <br /> 507.10.1 MONITORING INSTRUMENTS <br /> G The preferred instrument is a combustible gas meter (CGM) <br /> } with LEL and 0-500 ppm scales calibrated with hexane. If the CGM <br /> available for use does not have a ppm scale, a photoionization or <br /> i ; flame-ionization meter shall be used in combination with the CGM. <br /> 567.10.2 ACTION LEVELS <br /> The toxicity action levels given below are based on the <br /> ACGIH TLV for gasoline of 300 ppm adjusted to comply with the new <br /> OSHA benzene standard and are meter readings equivalent to 10 <br /> -� percent of the TLV. Respirators must be worn when meter readings <br /> r - averaged over 15 minutes equal or exceed the action level. <br /> Calibration Action <br /> Instrument Gas Level (gnm) <br /> Combustible gas meter Hexane 30 <br /> Combustible gas meter Methane 3: <br /> Photoionization meter with <br /> 10 to 10.2 eV lamp Benzene* <br /> 6 , <br /> Photoionization meter With <br /> 10 to 10.2 eV lamp Isobutylene 30 ' <br /> Flame-ionization meter <br /> ` ! (OVA-328) Methane 34 <br /> r.. *NOTE: Although the calibration gas purchased from HNU is <br /> isobutylene, the concentration identified on the cylinder <br /> { for calibration of HNTIs with 10.2 eV lamps. is an <br /> equivalent. <br /> The explosivity action level is 20 percent of LEL for`::.. <br /> hexane calibrated CGHs and 47 percent of LEL for methane calibrated <br /> CGMs. The CGM alarm must be set to sound at the action level. <br /> HAS-PRO507 HS-507-6 November 1990 <br />