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Air Monitoring Summary and Action Levels Combustible Lower Explosive Limit(LEL) Reading Action < 4% LEL <2, ppm Site activities will continue with normal monitoring 4%—20% LEL 2,000— 10 m Stop work until levels dissipate to <4% LEL > 20% LEL Potential explosion hazard. Halt all site activities, (>10,000 ppm) research source of release, aerate work area, suppress source. Air Monitoring Summary and Action Levels Hydrogen Sulfide Hydrogen Sulfide (H2S) Reading Action <10 ppm Site activities will continue with normal monitoring Stop work until levels dissipate to <10 ppm; use >10 ppm mechanical ventilation if possible. Consult with CHSD if unable to reduce concentrations below 10 ppm. 8.6.2 Air Monitoring Equipment and Calibration A PID calibrated to an appropriate calibration mixture will be used to detect organic vapors in and around the work areas. Monitoring will be conducted in and around all work areas and at the workers breathing zone before activities commence to establish a background level, then at 15-minute intervals throughout the day. All equipment will be calibrated according to the manufacturer's recommendation. A calibration log will be maintained and will include the name of the person who performed the calibration, the date and time calibrated, and the instrument reading at the time of calibration. A manual bellows pump or equivalent with colorimetric tubes for formaldehyde will be utilized to determine the course of action related to upgrading or downgrading the level of respiratory protection, as applicable. If air monitoring data indicate safe levels of potentially harmful constituents at consistent intervals (5-minute intervals), then monitoring can be conducted less frequently (every 30 minutes). This determination will be made by the on-Site SHSO. Monitoring data, including background readings and calibration records, will be documented. Work to be performed on-Site will conform to Roux's Standard Operating Procedures (SOPs). Conformance with these guidelines as well as the guidelines described in this HASP will aid in mitigating the physical and chemical hazards mentioned throughout this HASP. 8.7 Tailgate Safety Meetings A designated Site worker will provide daily safety briefings (e.g., tailgate meetings) including, but not limited to, the following scenarios: • When new operations are to be conducted; 3989.0001 S.104/HSP Site-Specific Health and Safety Plan I ROUX 131