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Project No 58080-06-01 July 7, 1994 Suspected Chemical Hazards The results of soil sampling and laboratory testing available for the subject site indicates that potential exposures to petroleum hydrocarbons as diesel fuel potentially containing organic lead are of primary concern during the proposed onsite activities Inhalation of volatile petroleum hydrocarbons is the exposure route of primary concern Potentially toxic substances may also enter the unprotected body by skin absorption, eye contact, and/or inadvertent ingestion Chemical exposures are generally divided into two categories acute and chronic Symptoms resulting from an acute exposure usually occur during or shortly after exposure to a sufficiently high concentration Symptoms resulting from a chronic exposure generally occur following prolonged or repeated exposures to lower concentrations The concentrations required to produce symptoms of exposure depend upon the medium in which the compounds occur, the duration of exposure, and the number of exposures These factors can vary widely in uncontrolled environments Generally, symptoms resulting from an exposure to the previously-noted volatile organic compounds (i e ,petroleum hydrocarbons including the aromatic volatile organics benzene, toluene, xylenes, and ethylbenzene) are first indicated by an intoxicating affect (i e , lightheadedness, nausea, headache, etc ) Since many volatile organic compounds possess ideal warning properties (i e , odors at low concentrations), harmful exposures via inhalation can be avoided Harmful exposures to metal such as organic lead via inhalation of fugitive dust may be avoided by the use of respirators equipped with dust filters A summary of the NIOSH/OSHA ambient air standards to select volatile hydrocarbons and organic lead is presented in Table I The reported routes of exposure, symptoms and Page 7