SR0085020 (4) - Laserfiche WebLink

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7.0 Air Monitoring/PPE 7.1 Air Monitoring Air monitoring must be performed on all sites in accordance with APTIM practices. Organic vapor and/or concentrations are monitored in the field with either a PID or FID. Flammable vapors and/or gasses, oxygen-deficient environments, and hydrogen sulfide (HzS) concentrations are monitored with an oxygen/combustible gas/hydrogen sulfide (Oz/LEL/HzS) meter (e.g., CGM 929 or equivalent). Airborne dust/particulate concentrations are measured with a real-time aerosol monitor (using a scattered light photometric sensing cell) when there are visible signs of airborne dust. Personal 4-gas meters (e.g., MSA Solaris or equivalent) offers simultaneous carbon monoxide, oxygen, hydrogen sulfide, and combustible gas detection with both audible and vibrating alarms and is used for monitoring personal breathing space for the wearer. When breathing space monitoring is required and work is performed under the buddy system, at least one person within the group must wear a personal 4-gas meter. Both area and personal air monitoring readings are to be taken to characterize site activities. Air monitoring results must be documented on the Air Monitoring Forms(see Appendix A) or in the field logbook. Calibration and maintenance of air monitoring equipment must follow manufacture specifications and must be documented. Re-calibration and adjustment of air monitoring equipment must be completed as site conditions and equipment operation warrant. Record all air monitoring equipment calibration and adjustment information on forms in (see Appendix A) or in the field logbook. Air monitoring action levels (see Table 4) have been developed that stipulate the chemical concentrations in the breathing zone that require an upgrade in level of PPE. Action levels are typically set at one-half of the OSHA Permissible Exposure Limit, NIOSH REL, or the ACGIH TLV. The rationale for establishing action levels is based on the available data that characterizes COCs in soil or water. All on-site workers must be properly fitted with PPE (i.e., respirators) and have been trained in their use (i.e., donning and doffing). Air monitoring measurements will be taken in the breathing zone of the worker most likely to have the highest exposure. Transient peaks will not automatically trigger action. Action will be taken when levels are consistently exceeded in a 5-minute period. Similarly, if chemical odors are detected that are a nuisance, bother-some, or irritating, an upgrade in respiratory protection can provide an extra level of comfort or protection when conducting site activities. See Section 4.1.1 for guidelines for frequency of air monitoring. See Table 2 for a description of PPE levels. See Table 3 for task-specific protection level and task-specific air monitoring requirements. Conduct air monitoring when the possibility of volatilization exists (e.g., new monitoring well, well containing known product). 7-1