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Refer to the table below for the Operational Action Levels. Contaminants Action Level Action to Take 1 to 10 PPM Above background at the breathing Level D, continuous air monitoring zone and sustained for 5 minutes VOCs 10 to 100 PPM Above background at the breathing Upgrade to Level C, continuous air monitoring and (PID) zone and sustained for 5 minutes ventilate space 100 to 300 PPM Above background at the breathing Upgrade to Level B, continuous air monitoring and zone and sustained for 1 minute ventilate space,or stop work and ventilate >300 PPM Above background at the breathing zone Stop work, Evacuate work zones and sustained for 1 minute Combustible Less than 10% lower explosive limit(LEL) Continue with caution and air monitoring (combustible gas monitoring) Gas in Air Greater than 10% LEL Stop work, immediately withdrawal personnel, and (LEL meter) ventilates ace with manhole blower Less than 19.5% Stop work and ventilate or upgrade to Level B Oxygen in Air o (02 Meter) 19.5 to 21.5/o Level D, continue work with air monitoring Greater than 21.5% Stop work, immediately withdrawal personnel, and evaluate The PID will be calibrated daily by Partner personnel prior to use. Calibration will be performed in accordance with the manufacturer specifications and recorded in a log book kept with the instrument. Ambient breathing space measurements should be collected every 15 minutes. Personal Protection Equipment Based on the preliminary site information including evaluation of the hazards at the site and Partner's experience, personal protective equipment (PPE) will be required for all personnel and visitors entering the controlled portion of the site. PPE for each potential level of protection is described below. Both Level C and D PPE should be available on-site during all phases of the project, as conditions may change and require additional PPE. Work should be conducted in Level D and no breathing protection will be required as long as monitored breathing zone vapor concentrations remain in the nominal operation action level. If on-site personnel find that breathing zone concentrations remain above nominal operation action level for more than 5 minutes, then the SSO or PM will make a determination if breathing protection is needed. At this time, all work in the affected area should be suspended until a decision is made. Implementation of Level C PPE will be required if work continues during elevated breathing zone concentrations. Donning and use of respirators shall be performed in accordance with manufacturer specifications. Replacement of respirator cartridges shall be performed in accordance with manufacturer specifications. All respirators and cartridges shall be stored in air tight bags while not in use. Refer to the PPE Levels of Protection for a detailed description of the equipment associated for each level of PPE. Partner Site-Specific Health and Safety Plan Page 5 Version 2.0 July 6,2021