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J <br />Inhalation of chemicals will be minimized by the use of respirators whenever significant <br />concentrations of airborne chemicals are detected. Air purifying respirators with cartridges <br />approved for use against organic vapors shall be utilized when needed, and filter attachments <br />for use against airborne particulates (dust) shall also be available. The need for respirators <br />will be determined by the project CIH, based on air monitoring data collected by either a <br />photoionization detector (PID) or standard industrial hygiene technique. Industrial hygiene <br />sampling results will be compared to either the ACGIH Threshold Limit Value (TLV) or the <br />OSHA Permissible Exposure Limit (PEL), whichever is more restrictive. <br />3.4.2.7 Site Specific Chemical Hazards <br />Gasoline vapor is a central nervous system depressant. The TLV for gasoline is 300 ppm. <br />Specific chemicals of concern and their characteristics include: <br />Chemical <br />PEL <br />TLV <br />Odor Threshold <br />Ionization <br />Constituent <br />(npm) <br />(nnm) <br />(pnm) <br />Potentials (Ev) <br />Benzene <br />1 <br />10 <br />4.7 <br />9.25 <br />Toluene <br />100 <br />100 <br />2.9 <br />8,82 <br />Ethylbenzene <br />100 <br />100 <br />2.3 <br />8,76 <br />Xylene <br />100 <br />100 <br />1.1 <br />8.45 <br />Symptoms of short term benzene exposure include headaches, dizziness, drowsiness and <br />nausea which may progress to convulsions and death at high vapor concentrations. Benzene <br />is a known human carcinogen. Symptoms of short term toluene exposure include headaches, <br />dizziness, fatigue, muscular weakness, drowsiness, and incoordination. Symptoms of <br />ethylbenzene include irritation of the eyes, nose, throat, and skin. Short term exposure to <br />xylene can cause dizziness, drowsiness, nausea, vomiting, loss of appetite and <br />unconsciousness. <br />Lead is also a central nervous system depressant. The TLV for lead is 50 microgram per <br />cubic meter. Lead can effect the nervous system, the blood forming system, the digestive <br />system, the kidneys and the reproductive system. Nervous system effects include: fatigue, <br />headache, irritability, sleep disorders, anxiety, slowed reaction time and hearing difficulties. <br />M7/07-07-92/EES/ENG/2054r 3.6 <br />