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• i The CEILING LIMIT is the concentration level that cannot be exceeded at any time. A suitable respirator and/or other suitable breathing apparatus and body protective equipment must be worn if concentration values reach or exceed the ceiling limit. The IDLH LEVEL represents a maximum concentration from which one could escape within 30-minutes of respirator failure without experiencing escape-impairment or irreversible health damage. The notation "Ca" appears in the IDLH column for all substances that NIOSH considers to be potential human carcinogens. 8XV080" T"Ln SCMSTANCE TLV-TWA TLV-STEL TLV-CEILING IDLH Benzene .01 ppm N/A N/A 3000 ppm (Ca) Toluene 100 ppm 150 ppm WA 2000 ppm Xylene 1.00 ppm 150 ppm N/A 1000 ppm Ethyl benzene ioo ppm 125 ppm N/A 2000 ppm Gasoline 300 ppm Soo ppm N/A ---- Prolonged exposures to concentrations above the limits noted may affect the Central Nervous system, Cardiovascular System, Respiratory System, eyes, skin, kidneys, bones and bone marrow. Research has shown that Benzene and some of the heavy metals are suspected or known carcinogens. Immediate symptoms of over-exposure ,include: Eye irritation, nose and throat irritation, headache, nausea, dizziness, drowsiness, meakneas, confusion, euphoria, excitement, staggered gait, a-bdominal pain, respiratory difficulties, muscle fatigue, and coma. It should be noted that summertime heat may initiate weather stress-related problems and decrease productivity on the job site. All RAH personnel will monitor for heat stress and take adequate precautions against it. Symptoms of heat streas .include: Heat rash, heat cramps, muscle spasms, pain in the hands and feet, heavy sweating, dizziness, nausea, fainting. 77�' Ro F. Butler Ra nd A. Henry, J Geologist Project Manager 12