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Table 1 <br /> Hazard Exposure Guidelines' <br /> ::. <br /> CAL QSHA 1990-91' ACGIH <br /> CQMPOUND <br /> PEL <br /> Benzene 1 ppm (TWA) 1 ppm (TWA) <br /> 5 ppm (STEL) <br /> Toluene 100 ppm (TWA) 100 ppm (TWA) <br /> 150 ppm (STEL) 150 ppm (STEL) <br /> Ethylbenzene 100 ppm (TWA) 100 ppm (TWA) <br /> 125 ppm (STEL) 125 ppm (STEL) <br /> Xylenes , 100 ppm (TWA) 100 ppm (TWA) <br /> 150 ppm (STEL) 125 ppm (STEL) <br /> Gasoline 300 ppm (TWA) 300 pprn (TWA) <br /> 500 ppm (STEL) 500 ppm (STEL) <br /> Diesel 100 ppm (TWA) <br /> NOTES: <br /> CAL OSHA = California Occupational Safety and Health <br /> Administration <br /> PEL = Permissible Exposure Limit <br /> ACGIH = American Conference of Governmental <br /> Industrial Hygienist <br /> TLV = Threshold Limit Values <br /> TWA = Time Weighted Average (S hour) <br /> STEL = Short Term Exposure Limit <br /> = Possible Contaminants that could be <br /> encountered as presently known <br /> PERSONAL PROTECTIVE EQUIPMENT <br /> A minimum of US EPA level D protection will be required within the exclusion zone for any <br /> workers engaged in sample collection or other activities. Level D protection will include: <br /> • Disposable Tyvek coverall (When in contact with contaminated material) <br /> H&.SPLAN.WP <br />