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6.0 ORGANIC VAPOR MONITORING <br /> The organic vapor concentrations (as measured by the OVM) in the breathing <br /> zone of the individual working closet to the vapor source will be monitored as <br /> needed with the OVM. Respirators must be worn if the concentrations are equal <br /> to or greater than the lowest TLV for the chemicals identified § 4.1.2. <br /> Health and Safety Plan Page 8 <br />