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engineering controls and administrative controls are deemed not feasible, respiratory protection will be <br /> required. <br /> Site personnel must also understand the limitations of air purifying respirators and the End-of-Service <br /> Life cartridge change-out schedule for the particular type of respirator that will be used. Manufacturer's <br /> data has been evaluated for three types of respirators (Scott, MSA, and Survivair). <br /> Any site personnel requiring respiratory protection must also adhere to the site-specific respiratory <br /> protection program. Personnel using a respirator that is not listed above should contact their HSR to <br /> determine the change-out schedule for the particular respirator used. Any questions regarding the site- <br /> specific respiratory protection program must be directed to the HSM or PM. <br /> 7.2.5 Levels of Protection <br /> Each activity conducted on site presents different hazards and, therefore, requires different levels of <br /> protection. There are four basic levels of protection established by U.S. Environmental Protection <br /> Agency field operating procedures. They are A, B, C, and D, with Level A being the highest level of <br /> protection and Level D being the lowest. <br /> The initial level of protection for each activity is Level D. PPE appropriate for each level of protection are <br /> presented in Table 2. <br /> 7-4 <br />