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Sep -02-99 01-05P Evans 3rott.ers Inc. 925 13 0229 '%� _.0V Gateway Protect - Stockton, CA Evans Brothen Inc. possible coma. Toluene can be a skin and mucous membrane irritant and studies have shown that high levels of toluene exposure can cause liver and kidney damage. 5.1.2.3 Ethylbenzene Exposure to ethyl benzene at high vapor concentrations may produce irritation to the skin, eye and upper respiratory tract. Overexposure to ethyl benzene vapors can produce central nervous system depression with symptoms of headache, nausea, dizziness, shortness of breath and unsteadiness. Prolonged skin exposure to ethyl benzene may result in drying and cracking of the skin (dermatitis). Solvent resistant gloves should be worn during sampling to prevent exposure to the skin. 5.1.2.4 Xylenes Depending on exposure factors, inhalation exposure to xylene vapor may produce central nervous system excitation followed by depression. Exposure to xylene vapor can produce dizziness, staggering, drowsiness and unconsciousness. At very high concentrations, xylene vapor may produce lung irritation, nausea, vomiting and abdominal pain. Xylene is not known to possess the chronic bone marrow toxicity of benzene, but liver enlargement and nerve -cell damage have been noted from chronic overexposure. 5.1.2.5 Diesel/Kerosene Diesel and kerosene fuel components are less volatile than gasoline. Aliphatic hydrocarbons may be saturated or unsaturated open chain, branched or unbranched molecule. Health precautions include ventilation for confined spaces. Symptoms of over exposure include nausea, vomiting, lung irritation and headache. . '.M.n.... :4 PNAs are organic compounds which consist of three or more condensed aromatic rings. PNAs are formed by prolysis or incomplete combustion of organic materials containing carbon and hydrogen. PNAs can be found almost anywhere; in the air, soil and water. Burning of fossil fuels causes the main emissions of PNAs in industrial environments. Acute toxicity to pure PNAs appears low when administered orally or dermally to mice or rats; however, prolonged or repeated administration shows that many PNAs have a carcinogenic effect. The long latency between first exposure and symptoms and many other factors makes the establishment of a threshold limit value very difficult. Because of their general low volatility, most likely routes of exposure in this particular project would be dermal contact. Atomization of soils containing PNAs is considered unlikely. The most effective method of controlling exposure would be the use of gloves and frequent changing of contaminated clothing. 6. AIR MONITORING PROCEDURES As all hazardous materials have been removed from the building by others prior to our work, air monitoring will not be required. Page 10 of 25