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' Beacon Cardlock Station Number 610 <br /> 3300 Waterloo Road SSB 92-1001-01 <br /> Stockton, California Page 11 <br /> TABLE 1 <br /> ' HYDROCARBON VAPOR CRITERIA AND RESPONSES <br /> HYDROCARBON CONCENTRATIONS RESPONSE <br /> ' <30 ppmv Total Volatile Hydrocarbons Limited hazard, no special p action <br /> 30-100 ppmv TVH General Work Areas Benzene detector tube measurements <br /> taken each 30 minutes <br /> 100-1400 ppmv TVH General Work Areas Half-mask OV Respirators worn by <br />' all in work area <br /> Benzene detector tube measurements <br /> taken each 30 minutes <br /> >1400 ppmv TVH Well Head Emissions Flush downhole with nitrogen as <br /> (near bore hole or auger flights) g g <br /> X1400 ppmv TVH General Work Areas Half mask OV respirators worn by <br /> all in work area. <br /> M Benzene detector tube and measurements <br /> taken each 15 minutes until levels are <br /> well below 1 ppmv <br /> >10 ppmv Benzene in General Work Areas Work stops, procedures taken to subdue <br /> excessive vapor levels <br /> Benzene detector tube measurements <br />' taken each 15 minutes until concen- <br /> trations are below 1 ppmv <br /> OV = Organic Vapor <br /> SSB ENVIRONMENTAL CONSULTANTS, INC <br />