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AIHA WEEL Workplace Environmental Exposure Limits set by the ANA (American Industrial Hygiene Association SKIN Skin absorption NIOSH National Institute for Occupation Safety and Health , CNS Central Nervous System CVS cardiovascular system, ' 'Action Level Table for Air Quality Monitoring • The level for respirator use indicated below is that concentration at which a respirator must be put on. It does not require the job to stop. The respirator is a tool to be used while determining why the exposure has reached that concentration. Take action to reduce the concentration by engineering controls such as water mist, spray foam, plastic cover, etc.- • The level for work stoppage indicated below is that concentration at which work on the job must stop. Determine why exposures have reached that concentration and how they can be reduced. Site evacuation is not necessary at this level. It does-not mean that stopping operations should reduce the likelihood that the concentration will continue to rise. Implement engineering controls to reduce the concentration, and then resume work. • PIDs — Photoionization Detectors are used for general hydrocarbon monitoring;'an example would be benzene, toluene, ethyl benzene and xylene, common on gasoline station sites. The PID typically uses either a 10.6 eV lamp (responds to pentane and higher hydrocarbons), or 99.7 eV lamp (responds to ethane (weakly), propane and higher hydrocarbons) to ionize and detect the gas.. The.PID wdl.measure hydrocarbons that are ionized, and therefore is a screening device, not a chemical-specific measurement instrument. • FIDs — Flame Ionization Detectors — Uses a hydrogen flame to ionize the gas.and detect its concentration. Typically used to measure concentrations of natural gas or gases that cannot be ionized by the PID. Use of an FID may not be intrinsically safe for use on high hazard sites where there is a.danger of reaching the lower explosive limit of the gas being measured. F1Ds are typically,calibrated using methane. Always follow the manufacturer's instructions for calibrating the FiD and for calculating response and correction factors. • Combustible Gas Meters—Measure 10% of the LEL or Lower Explosive Limit for the particular gas of concern—check the MSDS for the LEL. Combustible gas meters are usually equipped with an oxygen monitor measuring in % Oxygen. These meters are used in potentially explosive environments or where the PID measurement is at or above 100ppm. Example: Gasoline has an LEL of 1.7%. 196 = 10,000 PPM. LEL of,1,7% = 17,000 PPM and 10% of that is 9700 PPM. • Draeger Tubes--colorimetric tubes where air sample is pulled through the tube using a pump. The results are read from the color change on the tube. Follow the manufacturer's directions. • Use of PDA's, cell phones, pagers or other electrical devices (with the exception of intrinsically safe monitoring instruments) are prohibited in the exclusion zone until the atmosphere is considered safe through the use of a CGI. • The "levels for work stoppage"listed in the table below are based on measurements taken using PIDs calibrated with isobutylene; PIDs calibrated with gases other than isobutylene may have a different response factor. When calibrating with a calibration gas other than isobutylene, contact Phil Platcow, Director of 1H/H & S, at(617) 232-7355 office/(617)899-5403 cell or STANTEG Consulting Corporation 11-3