Laserfiche WebLink
I <br /> The CEILING LIMIT is the concentration level that cannot be <br /> exceeded at any time. A suitable respirator and/or other suitable <br /> breathing apparatus and body protective equipment must be worn if <br /> concentration values reach or exceed the ceiling limit. The IDLH <br /> LEVEL represents a maximum concentration from which one could <br /> escape within 30-minutes of respirator failure without experiencing <br /> escape-impairment or irreversible health damage. The notation "Ca" <br /> appears in the IDLH column for all substances that NIOSH considers <br /> to be potential human carcinogens. <br /> EXPOSURE TABLE <br /> SUBSTANCE TLV-TWA TLV-STEL TLV-CEILING IDLH <br /> Benzene . 01 ppm N/A N/A 3000 ppm (Ca) <br /> Toluene 100 ppm 150 ppm N/A 2000 ppm <br /> Xylene 100 ppm 150 ppm N/A 1000 ppm <br /> Ethyl benzene 100 ppm 125 ppm N/A 2000 ppm <br /> Gasoline 300 ppm 500 ppm N/A ---- <br /> Prolonged exposures to concentrations above the limits noted may <br />• affect the Central Nervous System, Cardiovascular System, <br /> Respiratory System, eyes, skin, kidneys, bones and bone marrow. <br /> Research has shown that Benzene and some of the heavy metals are <br /> suspected or known carcinogens. <br /> Immediate symptoms of over-exposure include: Eye irritation, nose <br /> and throat irritation, headache, nausea, dizziness, drowsiness, <br /> weakness, confusion, euphoria, excitement, staggered gait, <br /> abdominal pain, respiratory difficulties, muscle fatigue, and coma. <br /> It should be noted that summertime heat may initiate weather <br /> stress-related problems and decrease productivity on the fob <br /> site. All RAH personnel will monitor for heat stress and take <br /> adequate precautions against it. <br /> Symptoms of heat stress include: Heat rash, heat cramps, muscle <br /> spasms, pain in the hands and feet, heavy sweating, dizziness, <br /> nausea, fainting. <br /> Ro F. Butler Ra nd A. Henry, J . <br /> Geologist Project Manager <br /> 12 <br />