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Site Safety and Health Plan Petroleum Hydrocarbon Contamination Terracon Project#67047008 Page 6 hazard. Chronic inhalation results in symptoms that resemble acute poisoning, but are more severe systemically. GASOLINE Permissible Exposure Limit 300 ppm ACGIH TLV Gasoline is irritating to the skin, eyes and mucous membranes. Dermatitis may result from prolonged contact with the liquid. Gasoline acts as a central nervous system depressant. Exposure may cause staggering gait, slurred speech and mental confusion. Gasoline exposure may affect the liver, kidneys and spleen. Absorption of alkyl lead antiknock compounds contained in many gasolines poses an additional health concern, especially where there is prolonged skin contact. DIESEL FUEL (No. 2-D) Permissible Exposure Limit 400 ppm OSHA PEL (As petroleum distillates/naphtha) Diesel fuel is a skin and mucous membrane irritant and a central nervous system depressant. Poisoning may affect the liver and kidneys. Skin contact may result in drying and cracking of the skin. FUEL OIL (No. 6) Permissible Exposure Limit 400 ppm OSHA PEL (as petroleum distillates/naphtha) 0.2 mg/m3 OSHA PEL (Coal Tar Pitch Volatiles, "PNA's") Fuel oil No. 6, or"Bunker Fuel", may be irritating to the eyes and skin. Poisoning may affect the liver, kidneys and digestive system. This substance is likely.to contain polynuclear aromatic hydrocarbons (PNA's), some of which are considered carcinogenic. PNA's present a skin contact hazard. Avoid skin contact with potentially contaminated site materials. 7.2 Physical Hazards Activities to be performed on site may involve drilling equipment and materials. Personnel should be aware that as personal protective equipment increases, dexterity and visibility may be impacted and performing some tasks may be more difficult. Tape all loose protective clothing to avoid entanglement in rotating equipment. Other drilling safety precautions to be observed during this assessment include the following: • Before drilling proceeds, underground utilities must be located and marked. • All personnel working around drill rigs will be familiarized with emergency shut-down procedures and the position of"kill" switches. • No loose fitting clothing,jewelry or unsecured long hair is permitted near the rig.