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<br /> <br /> <br /> 4 <br /> TABLE I <br /> <br /> HYDROCARBON VAPOR CRITERIA AND RESPONSES <br /> <br /> <br /> <br />Hydrocarbon Concentrations Response <br /> <br /> <br /><30 ppmv No special action. <br /> <br />30 ppmv - 300 ppmv Half-mask Organic Vapor (OV) <br />respirators worn by all in work area. <br /> <br />>300 ppmv Discontinue work activities and <br />evacuate area. Evaluate measures to <br />subdue excessive vapor levels. <br /> <br /> <br /> <br /> <br /> <br />* in parts-per-million by volume within breathing zone, measured by photoionization detector equipped with <br />10.04 eV bulb.