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4.0 HAZARD ASSESSMENT According to available information, the major chemical compounds of concern most likely to be encountered during the work appear to be petroleum hydrocarbons(gasoline). The overall hazard to FREY personnel and associated subcontractors is estimated to be low. The following is a brief description of the potential hazards associated with these compounds: 4.1 HAZARDOUS CHEMICAL COMPOUNDS 4.1.1 GASOLINE/Petroleum Hydrocarbons RECOMMENDED EXPOSURE LIMIT MATERIAL CAS # TYPE AMOUNT AGENCY Gasoline B/END Inhalation 300ppm ACGIH Gasoline is a complex blend of petroleum hydrocarbons primarily composed of paraffins, napthenes, aromatics and olefins. It is a colorless to red liquid with a petroleum odor. It is a flammable liquid with a high volatility and its vapors are heavier than air. Under conditions where exposure may occur, mild eye, nose, and throat irritation, headache, nausea, drowsiness and dizziness may possibly occur. In open areas, ventilation is usually adequate to prevent prolonged breathing of high gasoline vapor concentrations. Gasoline containing benzene,toluene and xylene may be potentially carcinogenic in laboratory animals. A hazard assessment of these compounds follows the gasoline assessment. Gasoline has a flash point of-45°C. The flammability limits are 1.4 - 7.6%. Extreme caution must be taken to prevent sources of ignition from coming into contact with gasoline vapors. A 25 foot no smoking zone must be maintained during work hours. Petroleum hydrocarbons are complex blends of petroleum hydrocarbons including aliphatic and aromatic compounds. The following is a brief description of hazards associated with common aromatic petroleum distillates and four common chlorinated solvents. 4.1.2 AROMATIC PETROLEUM DISTILLATES RECOMMENDED EXPOSURE LIMITS Threshold Limit Values (TLV) MATERIAL CAS 3 TYPE AMOUNT AGENCY BENZENE 71-43-2 Inh 10 ppm ACGIH TOLUENE 108-88-3 Inh 100 ppm ACGIH XYLENE 1330-20-7 Inh 100 ppm ACGIH ETHYLBENZENE 100-41-4 Inh 100 ppm ACGIH These aromatic petroleum distillates are a significant portion of gasoline and are colorless liquids with strong petroleum hydrocarbon-like odors. They are flammable, moderately volatile, their vapors are heavier than air and they have low solubility in water. Exposure to the aromatic petroleum distillates in excess of their recommended exposure limits can cause mild eye, nose and throat irritation and can produce a narcotic effect on the central nervous system. Symptoms of exposure at these concentrations include headache, nausea, drowsiness, dizziness and loss of coordination. FREYEnvironmentai, inc. 3 Health & Safety Plan