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b : <br /> APPENDIX E <br /> RESPIRATORY AND DERMAL PROTECTION LEVELS <br /> RESPIRATORY PROTECTION <br /> l <br /> The appropriate levels of respiratory protection for site activities depend upon air <br /> s monitoring measurements. Selection of respiratory protection will be based on the <br /> following tables. in the event that the three monitoring systems indicate the need for <br /> different levels of respiratory protection, the most conservative protection level will be <br /> a <br /> used. <br /> i BENZENE <br /> . , Airborne Concentration of Benzene Respiratory Protection <br /> <1 ppm No protection needed <br /> >1 ppm to <50 ppm Full facepiece respirator with organic <br /> vapor cartridges <br /> Full facepiece gas mask with chin style <br /> canister <br /> >50 ppm to <l OQ ppm Full facepiece,powered air purifying <br /> respiratory with organic vapor canister <br /> >100 ppm to <1,000 ppm Supplied air respirator with full <br /> facepiece in positive pressure mode <br /> >1,000 ppm or unknown concentration Self-contained breathing apparatus with <br /> full face piece in positive pressure mode <br /> .: Full facepiece,positive pressure <br /> supplied air respirator with auxiliary <br /> self-contained air supply <br /> E-1 <br /> 172.030 31419! <br />