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.•a Y .qi � � ra f!I 7 1 j 507.10.3 MONITORING GUIDELINES �y Vapor monitoring should be performed as often as necessary and wherever necessary to protect field personnel from F-g hazardous vapors. Monitoring must be performed by individuals re of the required instruments. Because trained in the use and ca rably lower tkien explosivity toxicity action levels are conside � efforts should focus initially on action levels, monitoring - detection of toxic vapors. The presence of explosive levels of 3 gases and vapors should be performed only when gas/vapor • ° concentrations exceed the ppm range of the monitoring instruments and when explosive levels are expected (e.g. , inside tanks and other enclosed spaces) . During drilling operations, vapor emissions may be are measured measured continuously or periodically. If vapors continuously and the instrument must be unattended, the sample intake orifice or, in the case of instruments that operate by diffusion, the detector, must be positioned in a safe place , and the instrument alarm set to sound at downwind Of the borehole the action level. If the alarm sou!ids while monitoring conti.nuoi:jl;! fos 4 toxic concentrations, the sample intake orifice/detector should be moved so that vapor concentrations in the breathing zones of individuals ceasurLd. Decisions losest to -the boring are m regarding respirator use should be based on breathing zone vapor concentrations. If the alarm sounds while continuously monitoring fire explosive concentrations, initiate shut-down and evacuation procedures immediately. if vapor „fissions are measured periodically, they should be measured whenever fixe boring is open. Measurements may be limited to breathing zone air. - HS-507-7 November 1990 HAS-PR0507 i .�