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1 <br /> Sustained Breathing Level of Protection <br /> Zone TOV and Dust <br /> Background reading + up to 3 ppm Level-D <br /> TOV no respiratory protection) <br /> 3 ppm to 10 ppm TOV Level-C <br /> (half face air purifying respiratory <br /> equipped with organic vapor/HEPA <br /> cartrid es <br /> 10 ppm to 20 ppm TOV Level-C <br /> (full face air purifying respirators <br /> equipped with organic vapor/HEPA <br /> cartrid es <br /> Above 20 ppm TOV Cease work and notify PM and DINS <br /> immediate) <br /> A copy of ERM's Respiratory Protection Program is attached following <br /> this HSP. <br /> 5-3 <br />