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' types and concentrations of contaminants are potentially present, how the planned activities may result <br /> in dermal exposures, and what protective garments and devices are most effective against the probable <br /> dermal exposures Unfortunately, no one material is universally effective <br /> ' Published literature and manufacturer's guides must be consulted to determine the best <br /> protective clothing ensemble for each situation <br /> A problem related to the use of chemically protective clothing is heat stress Persons wearing <br /> ' protective clothing must recognize this constraint, and in most cases, the HSP will address specific <br /> work limitations to reduce heat stress The degree of dermal protection cannot be modified (except <br /> ' by an authorized plan approver) for personal comfort because such an action could compromise <br /> dermal protection <br /> ' Personnel must wear protective equipment when engaged in site activities that involve known <br /> ' or suspected atmospheric contamination due to vapors, gases or particulates, or when direct contact <br /> with known or suspected skin-affecting substances may occur Full-face respirators, chemical- <br /> resistant clothing, and safe work practices help to reduce worker exposure These and additional <br /> rpieces of equipment designed to protect workers from exposure to known or anticipated toxic <br /> chemicals are divided into four categories based on the degree of protection supplied by the <br /> ' equipment <br /> ' • Level A should be worn when the highest degree of respiratory, dermal, and eye <br /> protection is needed This level is necessary when the organic vapor (OV) <br /> ' concentration is greater than 200 parts per million (ppm) Work will be discontinued <br /> if conditions require Level A PPE <br /> • Level B should be worn when the highest degree of respiratory and eye protection is <br /> ' needed but a lesser degree of dermal protection is anticipated If OV concentrations <br /> are greater than 10 times the action level specified in this plan, but less than or equal <br /> to 200 ppm or the situation may be immediately dangerous to life and health ODLH), <br /> ' Level B protection is required <br /> • Level C should be worn when a lesser degree of respiratory and dermal protection is <br /> needed and conditions at the site meet certain criteria for using air-purifying <br /> respirators Level C is required when the OV concentration is above the action level <br /> specified within this plan Level C protection is discussed in greater detail in Section <br /> ' 3 0 of this attachment <br /> E - 2 <br /> 1 <br />