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lw� Anheuser-Busch/Arch Road Site Safety Plan February 11, 1992 8.0.2 If PID readings exceed 750 ppm, level B protection will be required. Personnel must leave site immediately and contact site safety officer or Health & Safety Manager for further instructions. 8.0.3 Respirator cartridges will be changed once per day as a minimum. This can be accomplished at the end of the work day during respirator decontamination. If breakthrough (as evidenced by odor, taste, or irritation) is detected while wearing the respirator or breathing becomes difficult, change cartridges immediately. 8.1 Tasks Performed Within a Confined Space When site work takes place in a confined space the air must be monitored for (a) oxygen level; (b) explosive vapors; and (c) toxic vapors. The following air monitoring procedures must be followed before entering a confined space. a. Oxygen Level: Monitor for % Oxygen with a OZ/LEL Meter to ensure a minimum oxygen level of 19.5%. Oxygen level monitoring will be done at the top, middle and bottom of the enclosed space to determine if there is a minimum acceptable oxygen level of 19.5% prior to entry. If ox-ygen is less than 19.5%, do not enter the space. b. Explosive Vapors: Monitor for % of Lower Explosive Limit (LEL) with a 0 /LEL Meter to determine whether vapor concentrations within t9e confined space exceed 20% of the LEL. If readings exceed 20% LEL, personnel shall shut off accessible equipment, leave the site immediately, and contact the fire department. C. Toxic Vapors: Monitor the air within the confined space for organic vapors with a PID or FID following guidelines stated in Section 8. 0 (above) to decide on the respiratory protection needed. Enter the space only if the oxygen level is at or above 19.5%, the %LEL is below 20%, the toxic vapor concentration is determined, and the proper respiratory protection is worn. PID or FID readings will be taken at the top, middle and bottom of a vault, shed, or other confined space to ensure that vapors do not exceed acceptable levels. All monitoring equipment must be calibrated and maintained in accordance with manufacturerls recommendations. Instruments should be calibrated, or the calibration checked (on instruments which cannot be field calibrated) at the beginning of each work shift, or whenever there is reason to suspect the performance of the instrument (e.g. , when inconsistent or erratic readings are obtained) . The results of the calibration or calibration check should be recorded on the Daily 17