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UNITS USED TO DESCRIBE OCCUPATIONAL EXPOSURES TO HAZARDOUS <br /> SUBSTANCES INCLUDE EXPOSURE LIMIT, ALSO KNOWN AS THE "THRESHOLD <br /> LIMIT VALUE" (TLV) , CEILING LIMIT, AND THE CONCENTRATION LEVEL <br /> THAT IS "IMMEDIATELY DANGEROUS TO LIFE AND HEALTH' (IDLH) . THE <br /> DEFINES THE MAXIMUM! CONCENTRATION OF A SUBSTANCE TO <br /> WHICH ONE CAN BE EXPOSED DURING AN S HOUR PERIOD WITHOUT SUFFERING <br /> SIGNIFICANT HEALTH EFFECTS. THE IS THE <br /> CONCENTRATION LEVEL THAT CANNOT BE EXCED AT ANY TIME; i.e. , A <br /> SUITABLE RESPIRATOR MUST BE WORN IF CONCENTRATION VALVE$ REACH THE <br /> CEILING LIMIT. THE Se + REPRESENTS A MAXIMUM CONCENTRATION <br /> u u FROM WHICH ONE COULD ESCAPE WITHIN 30 MINUTES OF RESPIRATOR <br /> FAILURE WITHOUT EXPERIENCING ESCAPE-IMPAIRMENT OR IRREVERSIBLE <br /> HEALTH DAMAGE,, IDLH VALUES ARE NOT LISTED FOR SUBSTANCES THAT ARE <br /> POTENTIAL HUMAN CARCINOGENS. <br /> CEILING LIMIT <br /> BENZENE O.ippm (Ohre) 1ppm (13mi.n) CARCINOGEN <br /> TOLUENE looppta (10hrs) 200ppm (10min) 2000ppm <br /> XYLENE 100ppm (Ohre) 200ppm (lomin) 100oppm <br /> # ETHYL BENZENE looppm (Ohre) N.A. 2000ppm <br /> TETRAETHYL LEAD 0.0057PPMI N.A. 3.6ppm <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 IS A KNOWN CARCINOGEN. <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 PAINT, RESPIRATORY DIFFICULTIES, MUSCLE FATIGUE, AND <br /> COMA. <br /> DUE TO THE INHERENT PHYSICAL DANGER OF WORKING IN THE VICINITY OF <br /> MOVING HEAVY MACHINERY, ALL PERSONNEL WILL WEAR HARDHATS AND STEEL <br /> TOED FOOTWARE AT ALL TIMES. <br /> PERSONNEL EXPOSURES TO EXCESSIVE JOB-RELATED HAZARDS ARE EXPECTED <br /> TO BE MINIMAL USING THESE SAFEGUARDS. <br /> IT SHOULD BE NOTED THAT SLIMMER TIME HEAT MAY INITIATE WEATHER <br /> ' STRESS-RELATED PROBLEMS AND DECREASE PRODUCTIVITY ON THE JOB SITE. <br /> SMOKING IS PROHIBITED AROUND OR NEAR THE WORK AREA. <br /> s <br /> h <br />