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IV. SITE EVALUATION <br /> The primary chemical hazard to which field personnel may be potentially exposed is <br /> gasoline and possible hydrocarbon vapors volatilizing from the excavation of possible <br /> contaminated soils. <br /> The secondary chemical hazard would be the dry ice used to inert the U.S.T.- <br /> A. Chemical Hazards <br /> 1.) Gasoline/ C.A.S. # 8006-61-9-LX3300000 - 1203 27 <br /> • Clear liquid with a characteristic liquid. <br /> • Properties: a complex mixture of volatile hydrocarbons <br /> • flash point: -45°F, boiling point: 102°F, LEL 1,4%, LTEL 7.6%, <br /> • ACGIH TLV: TWA 300 ppm <br /> • ACGIH STEL: 500 ppm <br /> • ODOR Threshold: ,3 ppm <br /> • Gasoline is toxic by inhalation, Human systemic effects by inhalation: cough, <br /> conjunctiva irritation, hallucinations or distorted perceptions. Repeated or prolonged <br /> dermal exposure causes dermatitis. Can cause blistering of the skin. Inhalation or <br /> ingestion can cause central nervous system depression. Pulmonary aspiration can cause <br /> severe pneumonitis, Some addiction has been reported from inhalation of fumes. Even <br /> brief inhalations of high concentrations can cause fatal pulmonary edema. The vapors are <br /> considered to be moderately poisonous. If its concentration in air is sufficiently high to <br /> reduce the oxygen content below that needed to maintain life, it acts as a simply <br /> asphyxiant. A human eye irritant, to fight fire use foam, CO2, dry chemical. <br /> 2.) Diesel/used to operate the backhoe <br /> • Properties: aromatic semi-volatile liquid; flash point -50°F, d. X1.0, Vapor density 3,0- <br /> 4.0, LEL 1.3%, LTEL 6.0%, <br /> • ACGIH TLV: TWA 300 ppm <br /> • ACGIH STEL: 500 ppm <br /> • ODOR Threshold: .3 ppm <br /> • Diesel is mildly toxic by inhalation. Human systemic effects by inhalation: cough, <br /> conjunctiva irritation, hallucinations or distorted perceptions, Repeated or prolonged <br /> dermal exposure causes dermatitis. Can cause blistering of the skin. Inhalation or <br /> ingestion can cause central nervous system depression. Pulmonary aspiration can cause <br /> severe pneumonitis. Some addiction has been reported from inhalation of fumes, Even <br /> t <br />