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..0 lL.lUllYG 1en.1U L11`lL 65-2y <br /> 1 <br /> • Log (Ottani-Later Partition Cosi:ficient) , "1 <br /> PHYSICO- log Ka : 2.13-4.87 (*) <br /> CHEMICAL a Soil Adsworption Coefficient, K : 65-36,000 (*) <br /> DATA • Henry' s Law Constant (atm-ma/mOK at 20-C) : � <br /> (continued) - 4.8 x 10�1 - 3.3 (*) <br /> • Bioconcentration Factor: no data ( ) <br /> Gasoline hydrocarbons are expected to be relatively mobile <br /> and moderately persistent in most soil systems. Persistence <br /> in deep soils and ground water may be higher. Volatiliza- <br /> tion, photooxidation and biodegradation are important fate , y <br /> processes. Surface spills are expected-to be weathered by <br /> PERSISTENCE evaporation and photooxidation. Downward migration of <br /> IN THE SOIL- weathered surface spills and sub-surface discharges repre- � <br /> NATER SYSTEM sent a potential threat to underlying ground water. Bio- <br /> degradation of gasoline hydrocarbons is expected to be sig- <br /> nificant under environmental conditions favorable to micro- <br /> bial oxidation; naturally-occurring, hydrocarbon-degrading Jt <br /> microorganisms have been isolated from polluted soils and, <br /> to a lessax extent, non-pollutad soils. <br /> The primary pathway of concern from the sail/ground-vater _ <br /> system is the migration of gasoline to ground water drinking <br /> PAMNAYS water supplies from leaking underground storage tanks or _ <br /> OF large spills. The use of this water may cause inhalation <br /> EXPOSURE exposures as well as ingestion and dermal exposures. Vapors r � <br /> from leaked or spilled gasoline may diffuse through soil and <br /> migrate into structures, resulting in inhalation exposures. <br /> Signs and S)amtoms _of Short-term HumAn Exposure (54) : <br /> Gasoline vapor is a CNS depressant. Low vapor levels may pro- <br /> duce flushing, staggering gait. slurred speech and mental con- <br /> fusion. High vapor levels may cause coma and death from <br /> respiratory failure. Ingestion and aspiration may cause <br /> chemical pneumonitis, pulmonary edema and hemorrhage. Gaso- <br /> line is irritating to the skin. conjunctiva and mucous mem- <br /> HEALTH brans. Prolonged contact may defat the skin and cause der- <br /> HAZARD matitis. Certain individuals may develop hypersensitivity. <br /> DATA <br /> Toxicity Based on Animal Studies: <br /> X50 (mg/kg) LCLo (mg/ms) r <br /> oral 13,600 [rat) (1924) inhalation (mammal) (51) <br /> skin -- no data 135,000.5 min <br /> 3ange of values for representative hydrocarbons from major component classes <br /> (See Table 65-3) . <br /> 6/87 <br />