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UNITS USED TO DESCRIBE OCCUPATIONAL EXPOSURES TO HAZARDOUS <br /> i 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 8 HOUR PERIOD WITHOUT SUFFERING <br /> SIGNIFICANT HEALTH EFFECTS. THE IS THE <br /> CONCENTRATION LEVEL THAT CANNOT BE EXCEEDED AT ANY TIME; i.®. , A <br /> SUITABLE RESPIRATOR MUST BE WORN IF CONCENTRATION VALUES REACH THE <br /> b - -- - CEILING LIMIT. THE MM LMMM REPRESENTS A MAXIMUM CONCENTRATION -_ <br /> r 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 /> ZxPOSURE LIMIT CEILING LIMIT <br /> BENZENE O.lppm (8hrs) Ippm (15min) CARCINOGEN <br /> TOLUENE lOOppm (10hrs) 200ppm (10min) 2000ppm <br /> XYLENE 100ppm (Shrs) 200ppm (10min) iDOOppm <br /> ETHYL BENZENE 100ppm (8hrs) N.A. 2000ppm <br /> PygF'f <br /> TETRAETHYL LEAD 0.0067PPM H.A. 3.6ppm <br /> PROLONGED EXPOSURES TO CONCENTRATIONS ABOVE THE LIMITS NOTED MAY <br /> AFFECT TETE 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 PAIN, RESPIRATORY DIFFICULTIES, MUSCLE FATIGUE, AND <br /> COMA. <br /> DUE TO THE INHERENT PHYSICAL DANGER OF WORKING IN THE VICINITY OF <br /> MOVING HEAVY MACHINERY, Ate+ 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 SUMMER TIME HEAT MAY INITIATE WEATHER <br /> STRESS-RELATED PROBLEMS AND DECREASE PRODUCTIVITY ON THE JOB SITE. <br /> �f SMOKING IS PROHIBITED AROUND OR NEAR THE WORK AREA. <br />