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C f'it Ton <br /> s <br /> exposure will rLat.h permissible exposure- level (PEL) or threshold limit value <br /> (TLVs) limits set by the Occupationdl SdiLty and Health Administration (OSHA) <br /> Following arc 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 = 13"". <br /> - TLV in the air = 300 ppm <br /> - OSHA 8-hour time-wcighted average (TWA) PEL = 300 ppni <br /> - OSHA short-term exposure limit (STEL) 15 minute = 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 /> • BenzMe <br /> This is a carcinogenic (cancer causing) substances Benzene is a commoft <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 /> - M=mum 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 /> -3- <br /> �vsii 01 RFP <br />