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RESPIRATORY <br /> EXPOSURE LIMITS' <br /> COMPOUND IDLH' TLV° <br /> Benzene 10(1)0 <br /> Ethylbenzene 2000 100 <br /> Toluene 2000 100 <br /> Xylene 1000 100 <br /> 1,1 DCA 4000 100' <br /> NOTES <br /> Units are parts-per-million (ppm) in air. <br /> b Immediately dangerous to life and health (published by <br /> National Institute for Occupational Safety and Health—NIOSH, <br /> 1985). <br /> Carcinogen. <br /> ' Threshold Limit Value expressed as time weighted average <br /> (American Conference of Governmental Industrial <br /> Hygienists—ACG I H, 1987-1988). <br /> 1 ppm 15 minute ceiling (NIOSH, 1985). <br /> f NIOSH, 1985 <br /> During this undertaking, on-site respirators will consist of the half-face type fitted with <br /> organic vapor cartridges (AO-R51 HE). Resoirators will be worn if photoionization <br /> detector (PID) monitoring indicates total organic vapors of 10 ppm or greater within <br /> the primary work zone breathing space for more than 15 minutes. If the total organic <br /> vapors are consistently greater than 50 ppm, full-face respirators will be will be worn <br /> and consideration will be given to upgrading protection and/or initiating engineering <br /> controls. <br /> EXPLOSION HAZARD <br /> During PID eir monitoring, 10 percent of the Lower Explosive Limit (LEL) for <br /> ethylbenzene would be considered the project safety standard. The LEL for <br /> ethylbenzene has been set by the National Institute for Occupational Safety and Health <br /> (NIOSH) at 1 .0 percent in air. Ten percent of 1.0 is equivalent to 1000 ppm. This <br /> monitoring would be performed on vapors emanating from the bore hole and auger <br /> cuttings. All equipment would be shut-down and ventilation would be initiated while <br /> further safety alternatives are evaluated if PID readings indicate near 1000 ppm levels. <br /> A dry chemical fire extinguisher would be on-hand at all times during this undertaking. <br /> ■ Geotechnical <br /> T <br /> ccd <br /> C <br /> W <br />