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Table 4 <br />Potential Chemical Hazards <br />Metals <br />CHEMICAL SYNONYMS & <br />TRADE NAMES PROPERTIES <br />EXPOSURE LIMITS (mg/e) ROUTES OF EXPOSURE SYMPTOMS! HEALTH EFFECTS TARGET ORGANS TWA <br />(8-hour workshift <br />40-hour week) <br /> IDLH <br />(exit immediately) <br />Notes: Exposure limits are California OSHA values (unless noted otherwise). If California OSHA values were not available, then NIOSH RELs or ACGIH TLVs were listed. <br />California OSHA Permissible Exposure Limit (CA PEL)- Legally required exposure limit. <br />* NIOSH Recommended Exposure Limit (REL)- Voluntary conservative exposure limit. <br />** ACGIH Threshold Limit Value (TLV)- Voluntary exposure limit (updated most frequently). <br />TWA = Time Weighted Average concentrations that must not be exceeded during any 8-hour workshift during a 40-hour workweek. <br />IDLH = Immediately Dangerous to Life or Health - a condition that poses a threat of exposure to airborne contaminants when that exposure is likely to cause death, <br />immediate or delayed permanent adverse health effects, or prevent escape from such an environment. EVERY EFFORT SHOULD BE MADE TO EXIT IMMEDIATELY! <br />Flashpoint = the temperature at which the liquid phase gives off enough vapor to flash when exposed to an external ignition source. <br />UEL = upper explosive (flammable) limit in air % by volume. <br />LEL = lower explosive (flammable) limit in air % by volume. <br />mg/in' = milligram per cubic meter. <br />inh = inhalation <br />abs = absorption <br />ing = ingestion <br />con = skin and/or eye contact <br />Page 3 of 3 The Source Group, Inc.