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2.3.1 Physical Hazards A direct-reading portable combustible gas indicator (CGI) calibrated to hexane, which measures VOC concentrations as a percentage of the lower explosive limit (LEL) and the percentage of respirable oxygen in the worker breathing zone, will be used to evaluate potential flammable and/ or oxygen deficient atmospheres in and around the work area. CGI use will be every 15 minutes, at a minimum, and collected where tasks involve: chemical use, potential for hazardous wastes, compressed gases, confined spaces, use of internal combustion engines, and hot work. 2.3.2 Chemical Hazards A total volatile organic compounds instrument, (e.g., PID, OVA, OVM,) and a combustible gas indicator CGI will be used to monitor the workers breathing zone during field operations. Prior to starting the task and every 15 minutes thereafter, the Site Responsible Person, or designee, will measure VOC, LEL, Oxygen, and Carbon Monoxide (CO) concentrations in the workers breathing zone and general work area. Exposure monitoring results will be recorded, interpreted, and communicated to all affected workers. Where readings exceed the action levels specified in Table 1 below for 5 minutes or more, sustained, the Site Responsible Person will immediately stop work in a safe manner, evacuate personnel from the work area and report conditions to the PM. The PM and CSM will evaluate the need to upgrade to Level C respiratory protection, or implement additional engineering controls to lower the ambient concentration(s). Direct-reading air monitoring instruments shall only be used by personnel who are trained in the proper calibration and use of the equipment, and data interpretation. Table 1 Air Monitoring Action Levels AIM Equipment Action Level Action(s) Required PID 10.0 ppm Half-face APR required with P100 combination organic vapor/ particulate matter cartridges. Monitor work area every 15 minutes PID 50.0 ppm Full-face APR required with P100 combination organic vapor/ particulate matter cartridges. Monitor breathing zone every 15 minutes CGI/ 02 02 < 19.5% or > 22.0% Stop work and clear work area of all personnel. Implement forced air or exhaust ventilation. Re-assess work area every 15 minutes. CGI/ 02 > 10% LEL Stop work and clear work area of all personnel. Implement forced air or exhaust ventilation. Re-assess work area every 15 minutes. CGI/ 02/ CO 12 ppm Stop work and clear work area of all personnel. Implement forced air or exhaust ventilation. Re-assess work area every 15 minutes. Should CO levels not fall below 12ppm, evaluate need for supplied-air respiratory protection APR = Air Purifying Respirator CGI= Combustible Gas Indicator CO= Carbon Monoxide LEL= Lower Explosive Level PID= Photo Ionizing Detector Notes: Explosion-proof fans are to be used for ventilating organic vapors. Site equipment using internal combustion engines is to be outfitted with exhaust spark arrestors prior to continuing site activities where LEL readings have been identified. BP Arco # HASP Created by: Scott Bittinger Revised by: Evan Lee Eau Template Version: 02.02 Created on: 10/02/2017 Revision date:10/30/2017