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