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Zan, <br /> PRIOR TC CONDUC"N9 ANY SUESURFACE EXCAVATION IN THE VICINITY OF A <br /> r- PURL TANK, THS TANK SHOULD BE SMPT19D OF ALL LIQUID PRODUCT AND <br /> RECE=VR BVFPICINUT QUANTITIES OF DRY ICE (FROZEN CARBON DIOXIDE) <br /> 80 THAT AVAILABLE OXYGEN I8 DISPLACED FROM THE TANK ATMOSPHERE. <br /> A LESSER KNOWN HEALTH HAZARD RESULTING FROM EXPOSURE TO GASOLINE <br /> IS TOXICITY. SEVERAL COMMON CONSTITUENTS OF GASOLINE HAVE BEEN <br /> LINKED TO VARIOUS HEALTH PROBLEMS, THE CONSTITUENTS OF GASOLINE <br /> THAT HAVE BEEN SHOWN TO CAUSE SERIOUS HEALTH PROBLEMS RESULTING <br /> FROM RELATIVELY MINOR EXPOSURES INCLUDE BRNZSNS, TOLUENE, meta, <br /> para, and Ortho XYLENES, ETHYL BENZENE AND TSTRAETHYL LEAD. <br /> TYPICLL PERCENTAGES (BY WEIGHT) OF THESE CONSTITUENTS IN GASOLINE <br /> ARE: BENZENE - 0.12-3.50% , TOLUENE - 2.r3-21.80% , meta XYLENE <br /> 1..77-3. 87% , Parra XYLENE - 0. 77-1.58% , ortho XYLENE - 0.68-2.86% <br /> , AND ETHYL BENZENE - 0.36-2.86% . TYPICAL PERCENTAGE OF <br /> TETRAETHYL LEAD IS NOT AVAILABLE. <br /> 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 LErEL <br /> THAT IS "IMMEDIATELY DANGEROUS TO LIFE AND HEALTH" (IDLH) . THE <br /> EXPOSURE LIMIT DEFINES THE AAXIMjM CONCENTRATION OF A SUBSTANCE TO <br /> WHICH ONE CAN BI`s EXPOSED DURING AN 8 HOUR PERIOD WITHOUT SUFFERING <br /> SIGNIFICANT HEALTH EFFECTS. THE CEILING LIMIT IS THE CONCENTRATION <br /> LEVEL THAT CANNOT BE EXCEEDED AT ANY TIME; i .e . , A SUITABLE <br /> RESPIRATOR MUST BE WORN IF CONCENTRATION VALUES REACH THE CEILING <br /> LIMIT. THE IDLH LEVEL REPRESENTS A MAXIMUM CONCENTRATION FROM <br /> - WHICH ONE COULD ESCAPE wrTHIN 30 MINUTES OF RESPIRATOR FAILURE <br /> WITHOUT EXPERIENCING ESCAPE-IMPAIRMENT OR IRREVERSIBLE HEALTH <br /> DAMAGE. IDLH VALUES ARE NOT LISTED POR SUBSTANCES THAT ARE <br /> POTENTIAL HUMAN CARCINOGENS . <br /> EXPOSURE TABLE <br /> S48STANCE EXPOSURE LIMIT CEILING LIMIT IDLH <br /> BENZENE O. lppm (Shrs) 1ppm (15min) CARCINOGEN <br /> TOLUENE 100ppm (10hrs) 200ppia (10min) 2000ppm <br /> XYLENE 100ppm Mrs) 200ppm (10min) 1000ppm <br /> ETHYL BENZENE 100ppm Mrs) N.A. 2000ppm <br /> TETRAETHYL LEAD 0. 0067ppm N.A. 3.6ppm <br /> page 2 <br />