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Attachment 6a 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,lob 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 hkelthood 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. CHEMICAL MONITORING TASK MONITORING LEVEL FOR (OR CLASS) EQUIPMENT FREQUENCY/ LEVEL FOR WORK LOCATION RESPIRATOR USE STOPPAGE Volatile Organic FID/PID as appropriate From start of 20 ppm above 50 ppm above Vapors for chetmproject cals of concern mobilization to Sampling shouldhile disturbing bing potentially continuous during the background sustained in background in project w Read manual to completion and breathing zone for 2 breathing zone and determine demobilization tacontaminateds andip soil or uncovering/removing ringddrilling tle mutes,and no benzene no vinyl chloride or tanks and piping,or during drilling At least and/or vinyl chloride benzene tube Draeger Tube for vinyl every 15 minutes m the breathing zone tube discoloration if a discoloration Stop chloride(model Va part Sample to at the exclusion zone boundaries color change appears on work if tube number 67 2803 1) every 30 minutes Continuously sample tube for benzene or vinyl indicates> I 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 at 25 ppm 5ppm SECOR International Incorporated 26 Genenc HASP 6-14 01