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See Map DIRECTIONS TO HOSPITAL EMERGENCY ROOM ATTACHED IN APPENDIX A Air Monitoring Air quality in the breathing zone will be monitored continuously with a MiniRae2000 photoionization detector (PID) calibrated to isobutylene. Work will proceed in Level D while PID readings are between 0 and 10 parts per million (ppm). In the event that breathing zone readings exceed 100 ppm, all personnel will discontinue work at the location and withdraw from the work area. The appropriate vapor control measures will be implemented (e.g., application of vapor suppression), the necessary emergency response authorities will be notified, and/or the work area will be re-sampled until vapor levels are within acceptable levels prior to reentering the work zone. Please refer to the table below for the Operational Action Levels. Contaminants Action Level Action to Take VOCs (PID) 1 to 10 PPM Above background at the breathing zone and sustained for 5 minutes 10 to 100 PPM Above background at the breathing zone and sustained for 5 minutes 100 to 300 PPM Above background at the breathing zone and sustained for 1 minute >300 PPM Above background at the breathing zone and sustained for 1 minute Level D, continuous air monitoring Upgrade to Level C, continuous air monitoring and ventilate space Upgrade to Level B, continuous air monitoring and ventilate space, or stop work and ventilate Stop work, Evacuate work zones Combustible Gas in Air (LEL meter) Less than 10% lower explosive limit (LEL) Greater than 10% LEL Continue with caution and air monitoring (combustible gas monitoring) Stop work, immediately withdrawal personnel, and ventilate space with manhole blower Oxygen in Air (02 Meter) Less than 19.5% 19.5 to 21.5% Greater than 21.5% Stop work and ventilate or upgrade to Level B Level D, continue work with air monitoring Stop work, immediately withdrawal personnel, and evaluate The PID will be calibrated daily by Terrax 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, 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 Site-Specific Health and Safety Plan Page 3 Version 1.02 September 30,2016