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x <br /> CIa--ton <br /> exposure will reach permissible exposure level (PEL) or threshold limit val-ie <br /> (TLVs) limits set by the Occupational Safety and Health Administration (OSHA), <br /> Following are short descriptions of each contaminant suspected of being present <br /> onsite: <br /> • Gasoline <br /> Gasoline is a clear, aromatic, volatile liquid. It is a mixture of aliphatic <br /> hydrocarbons and has: <br /> Maximum concentration in the soil = 68 ppm <br /> - Flash point = 50°F <br /> Lower exposure limit = 1.3% <br /> - TLV in the air = 300 ppm <br /> OSHA 8-hour time-weighted average (TWA) PEL = 300 ppm <br /> - OSHA short-term exposure limit (STEL) 15 minute W 500 ppm <br /> • Oil and Grease <br /> This material contains heavy hydrocarbons, and presents slight or no inhalation <br /> danger. However, absorption through the skin is possible. Maximum <br /> concentration in the soil of oil and grease is 250 ppm. <br /> • Benzene <br /> This is a carcinogenic (cancer causing) substances. Benzene is a common <br /> constituent of gasoline and other petroleum product materials. It is a clear, <br /> colorless liquid and.has: <br /> Flash point = 12°F <br /> - TLV = 1' Ppm <br /> OSHA PEL = 1 ppm <br /> - STEL (15 minute) = 5 ppm <br /> Benzene was not detected in the soil. <br /> • Ethyl Benzene <br /> This colorless liquid with an aromatic odor has: <br /> - Maximum concentration in the soil 0.33 ppm <br /> Flash point._'59°F <br /> OSHA 8-hour TWA'= 100 ppm <br /> - OSHA STEL = 125 ppm <br /> J <br /> -3- <br />