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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, then resume work. • These values can be modified with particular knowledge of contaminants and site conditions. Contact Director of Industrial Hygiene & Health and Safety, Philip Platcow to discuss(617) 232-7355. • On Sites impacted with chemicals other Petroleum products, contact Phil Platcow, Director of IH/H&s, at(617) 232-7355 office/(617)899- 5403 cell or Pat Wilson, CIH, at(817) 640-9621X34 office/(817) 296-3165 cell, for guidance on the air monitoring requirements CHEMICAL MONITORING MONITORING LEVEL FOR LEVEL FOR WORK (OR CLASS) EQUIPMENT TASK FREQUENCY/ RESPIRATOR USE STOPPAGE LOCATION Sampling should be continuous Respirator to be used will be full- Volatile Organic FID/PID as From start of mobilization during the project while disturbing face piece respirator with organic 50 ppm in breathing zone Vapors appropriate for to completion and potentially contaminated soil or vapor/P 100 combination and no vinyl chloride or chemicals of concern. demobilizationbenzene tube Read manual to uncovering/removing tanks and cartridges. discoloration.Stop work if determine. piping,or during drilling. At least tube indicates> 1 m for every 15 minutes in the breathing 20 ppm sustained in breathing pp Draeger Tube for vinyl zone. zone for 2 minutes,and no benzene or vinyl chloride. chloride(model 1/a Sample at the exclusion zone benzene and/or vinyl chloride If no Draeger Tube part number 67 boundaries every 30 minutes. tube discoloration. If a color available,stop work at 25 28031). Continuously sample during each change appears on tube for ppm on the PID/FID. soil and groundwater sampling benzene or vinyl chloride at< Draeger Tube forintervalIf 5 20ppm on PID/FID,don Continuously attempt to benzene(model . ppm in breathing respirator. determine cause of 0.5/a). zone,collect a Draeger tube for usage and a of benzene and/or vinyl chloride exposure g (depending upon contaminants of If no Draeger Tubes are available, engineering controls to concern). the level for respirator use will be attempt to never reach the 5ppm on the PID/FID. stop work level At donning respirator level, determine cause of exposure and implement engineering controls to reduce concentrations. 13.0 DETAILED PROJECT STEPS WITH HAZARD ASSESSMENTS AND PRECAUTIONS Traffic Guidance and Control Plan: PG&E SECOR International Incorporated SECOR Project No.050T.50234.00.0003 PG&E French Camp HASPB.doc 12