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Work Plan—PEA Page 3 Former Haley Flying Service GPE Project 474.2 It is not known which, if any, pesticides may be present in the soil, but the most toxic substance likely to be present is DDT (dichlorodiphenyltrichloroethane). DDT is a poison that may be harmful if inhaled or absorbed by dermal contact, and it is a possible carcinogen. It is a bio- accumulative compound that can be stored in body fats. According to available toxicity data, the oral dosage lethal to 50 percent of rats (LD-50) is 87 mg/Kg, and dermal dosage found lethal to 50 percent of rats is 1,931 mg/Kg. The indicated protection from DDT exposure is the use of safety glasses, gloves, and good ventilation. The possibility of inhalation of dust will be mitigated by sampling only when winds are sufficiently calm that dust is not be raised. Heat Stress/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 is not 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 job site is not generally expected to be so noisy as to pose a hazard to hearing. The only equipment expected to be used that generates significant noise is the Geo-Probe drilling rig, a small electrical generator, and a small roto-hammer. This equipment will be muffled and should not pose a health hazard unless prolonged exposure at very close proximity is experienced. By using normal work procedures, no special hearing protection should be needed. Safety Hazards Common physical hazards associated with soil boring and sampling activities, are expected lie primarily with operation of the Geo-Probe drilling rig. 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). 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209) 569-0295