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Attachment 6 SECOR Action Level Table For Chemical Monitoring (Add or delete contaminant from the following table as appropriate for the site). • 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 we determine why the exposure has reached that concentration. Work to reduce the concentration by engineering controls such as water mist or spray foam or plastic cover, etc. • • The level for work stoppage indicated below is that concentration at which we must stop the job and determine why exposures have reached that concentration and how they can be reduced. It does not mean that we must leave the site. Stopping the operations is a precaution we take to reduce the likelihood that concentration will rise still higher. Following 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. CHEMICAL MONITORING TASK MONITORING LEVEL FOR (OR CLASS) EQUIPMENT FREQUENCY/ LEVELFOR WORK LOCATION RESPIRATOR USE STOPPAGE Volatile Organic FID/PID as appropriate From start of 20 ppm above 50 ppm above Vapors for chemicals of concern. mobilization to Sampling should be continuous during the p project while disturbing potentially background sustained in background in Read manual to completion and breathing zone for 2 breathing zone and determine. demobilization contaminated pip soil or uncovering/removingring. At minutes,and no benzene no vinyl chloride or tanks and piping,or during drilling. e.least and/or vinyl chloride benzene tube Draeger Tube for vinyl every 15 minutes in the breathing zone. tube discoloration. If a discoloration. Stop • chloride(model 1/a part Sample in at the exclusion zone boundaries color change appears on work if tube number 67 28031). every 30 minutes. Continuously sample tube for benzene or vinyl indicates> ]ppm during each soil and groundwater sampling chloride at 10ppm on for benzene or vinyl Draeger Tube for benzene interval. If 10 ppm in breathing zone,collect FID/PID,don respirator. chloride. (model 0.5/a). a Draeger tube for benzene and/or vinyl chloride(depending upon contaminants of If no Draeger Tubes are If no Draeger Tube concern). available,the level for available,stop work respirator use will be 5 at 25 ppm. ppm. SECOR International Incorporated 31 Generic HASP