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SITE-SPECIFIC HEALTH AND SAFETY PLAN FOR WELL INSTALLATIONS <br />Potential Airborne Concerns <br />May 4, 2017 <br />4.1 AIR MONITORING & ACTION LEVELS <br />The Level for Respirator Use is the concentration at which a respirator will be put on; it does not require the job to stop. The respirator is a tool to be used <br />while determining why the exposure has reached that concentration. Take action to reduce the concentration using engineering controls such as <br />water mist, spray foam, plastic cover, etc. <br />The Level for Work Stoppage is the concentration at which work on the job will stop. Determine why exposures have reached that concentration and <br />how they can be reduced. Site evacuation is not necessary at this level. Implement engineering controls to reduce the concentration, and then <br />resume work. <br />Photoionization detectors (PIDs) are used for general hydrocarbon monitoring; an example would be benzene, toluene, ethylbenzene, and xylene, <br />common on gasoline station sites. The PID typically uses either a 10.6 eV lamp (responds to pentane and higher hydrocarbons), or 11.7 eV lamp <br />(responds to ethane [weakly], propane and higher hydrocarbons) to ionize and detect the gas. The PID will measure hydrocarbons that are ionized, <br />and therefore is a general screening device, not a chemical-specific measurement instrument. The Levels for Work Stoppage are based on <br />measurements taken using PIDs calibrated with isobutylene; PIDs calibrated with gases other than isobutylene may have a different response factor. <br />Contact Tony Wong (see Sec. 1.7) for guidance on air monitoring requirements in the following cases: <br />You wish to modify the Action Levels based on particular knowledge of contaminants and site conditions. <br />When calibrating with a calibration gas other than isobutylene. <br />On sites impacted with chemicals other than petroleum products. <br />CHEMICAL <br />(OR CLASS) <br />MONITORING <br />EQUIENT TASK <br />MONITORING <br />FREQUENCY/ <br />LOCATION <br />LEVEL FOR <br />RESPIRATOR USE <br />LEVEL FOR <br />WORK <br />STOPPAGE <br />Volatile Organic <br />Vapors <br />Photoionization <br />Detector (PID). <br />Ultra Rae or Draeger <br />Pump and Tubes for <br />benzene (model 0.5/a). <br />During disruption of <br />potentially <br />contaminated soil, <br />air monitor in <br />breathing zone and <br />at designated <br />perimeter locations <br />from start of <br />mobilization to <br />completion and <br />demobilization. <br />Sampling should be continuous <br />during the project during activities <br />where contaminated media maybe <br />present. <br />Conduct monitoring in breathing <br />zone and record the readings at <br />least every 15 minutes. <br />Sample at the exclusion zone <br />boundaries every 30 minutes. <br />Sample designated perimeter <br />locations during construction <br />activities. <br />If 5 ppm in breathing zone on PID, <br />Respirator to be used will <br />be full-face piece <br />respirator with organic <br />vapor/P 100 combination <br />cartridges, <br />If 25 ppm on PID is <br />sustained in breathing <br />zone for 2 minutes, and <br />no benzene tube <br />discoloration. DON <br />Respirator. <br />If <25 ppm on PID and <br />color change (less than <br />one) appears on tube <br />50 ppm in <br />breathing zone <br />and no <br />benzene tube <br />discoloration. <br />Stop work if <br />tube indicates > <br />lppm for <br />benzene. <br />Continuously <br />attempt to <br />determine <br />cause of <br />exposure and <br />19