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II. Job Hazard Analysis Chemical Exposure The subsurface. soil still contains residual gasoline hydrocarbons including benzene, a known carcinogen. The principal health hazard associated with this condition is inhalation of volatile organic vapor and dermal contact poses a secondary hazard. Ingestion is not considered to be a j likely route of exposure for the proposed work. Gasoline is a variable mixture of a wide variety of volatile organic compounds, hydrocarbons. An MSDS sheet for typical gasoline is attached. Non-chronic exposure to gasoline causes irritation but there generally are no long-term effects. Inhalation of high concentrations of vapors or mists may cause respiratory system irritation and damage. It may also result in the damage and depression of the central nervous system and may cause death. Prolonged contact with the material may cause severe skin irritation. According to available toxicity data, the-oral and dermal dosages lethal to 50 percent of rats(LD- 50) is more than 2,000 mg/Kg. The LD-50 dosage for inhalation exposure is 50 mg/L. Heat Stress l Stroke During periods of high summer heat, heat stress and heat exhaustion can pose a hazard to workers, especially for those site workers wearing impermeable or semi-impermeable protective clothing. In this case, such clothing isnot expected to be needed. Personnel should be aware of the early signs and symptoms of heat stress/exhaustion. These include rapid or pounding heart rate, lightheadedness, fatigue, and excessive sweating. As heat stress continues cramping or muscle spasms may develop and the person becomes weak. As heat stress progresses to heat exhaustion, the person becomes nauseous, develops a headache, and becomes less responsive. Ultimately, heat stroke occurs which is marked by increased body temperature, mental confusion, loss of consciousness, and rapid but weak pulse. These conditions can result in severe injury or death. First Aid—If any of these symptoms occur, immediately move the victim to a shady, cool area with good air circulation. Cool victim; if conscious, he may try to sip water. Remove protective clothing;treat for shock. Get medical attention. Noise The only part of the job site generally expected to be so noisy as to pose a hazard to hearing is the area immediately around the drilling rig. Workers in close proximity to engines or other equipment producing continuous noise in excess of 90 dB shall wear hearing protection. Workers exposed to impact noise in excess of 115 dB shall wear hearing protection. Safety Hazards Common physical hazards associated with drilling activities, are expected. The drilling contractor is responsible for the proper inspection, maintenance and use of their equipment. All work will be conducted in a.safe manner in compliance with appropriate OSHA regulations (29 CFR).