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Site Health and Safety Plan Page 24 <br />When necessary, multiple layers of protection shall be used to accommodate the range of <br />hazards that may be encountered. All PPE shall be properly fitted, donned and doffed in <br />accordance with manufacturer's recommendations. <br />PPE selection criteria shall include: <br />• Level of PPE required (i.e., Level A, B, C, or D) <br />• PPE components <br />• Expected work tasks and duration <br />• Climatic considerations <br />• Personal tolerances <br />Any changes in PPE selection must be approved by the project SSHO. All PPE ensembles shall <br />be consistent with Appendix B of 29 CFR 1926.65, and used in accordance with manufacturer's <br />recommendations. <br />6.1.1 Levels of PPE Protection <br />Although Levels A, B, and C are not anticipated, site conditions may be encountered that <br />require their use. The following sections describe the requirements and level of protection <br />offered from each PPE ensemble. <br />6.1.1.1 Level A PPE <br />Level A PPE protection is selected and used when the greatest level of skin, respiratory, and <br />eye protection is necessary based on either the measured high concentration of <br />atmospheric papers, gases, or particulates; or site operations and work functions involve a <br />high potential for splash, immersion, or exposure to unexpected vapors, gases, or <br />particulates of materials that are harmful to skin or capable of being absorbed through the <br />skin. Moreover, Level A PPE shall be used when substances with a high degree of hazards to <br />the skin are known or suspected to be present, and skin contact as possible; or, operations <br />must be conducted in confined, poorly ventilated areas, and the absence of conditions <br />requiring Level A have not yet been determined. <br />The following constitute the Level A ensemble: <br />• Positive pressure, full face self-contained breathing apparatus (SCBA), or positive <br />pressure supplied air respirator with escape SCBA, approved by the NIOSH <br />• Totally encapsulating chemical protective suit <br />• Coveralls <br />• Long underwear <br />• Gloves, outer, chemical resistant <br />• Gloves, inner, chemical resistant <br />• Boots, chemical resistant, steel toe and shank <br />• Hardhat (under suit) <br />• Disposable protective suit, gloves and boots (depending on suit construction, may be <br />worn over the totally encapsulating suit)