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0 0 <br /> 3.1 Dermal Exposure Hazard <br /> Contact of sufficient duration to cause significant absorption of toxic components <br /> is highly unlikely. Repeated daily or prolonged contact with drilling spoils, <br /> however, may be expected to defat the skin and perhaps over a long period of <br /> time lead to irritation and dermatitis. For this reason, direct contact with <br /> contaminated soils should be avoided when possible by wearing gloves. <br /> However, if prolonged skin contact does occur, the exposed areas shall be <br /> washed with soap and water and rinsed thoroughly. <br /> 3.2 Explosion Hazard <br /> Elevated vapor concentrations of flammables may be present as a result of an <br /> off-site underground fuel tank leak, (though unlikely) which could be a source for <br /> explosion. Caution must be taken to prevent sources of ignition such as <br /> cigarettes, open flames and non-explosion proof electrical motors from operating <br /> within the restricted zone (§ 5.2). Typical 'Lower Explosive Limits (LEL's) for <br /> solvents expected to be encountered are between 0.7 percent (7,000 ppm) and <br /> 2.0 (20,000 ppm). The heavier diesel fuels typically have higher LEL's. In the <br /> event of uncontrolled escape of flammable vapors emanating from the borehole, <br /> drilling will be discontinued and bentonite will be used to cap the hollow-stem <br /> augers in order to prevent area and neighborhood evacuation. <br /> 3.3 Other Hazards <br /> Sufficient attention must be paid to other possible hazards on the site including <br /> but not limited to: <br /> - working near drilling equipment, <br /> - improper use of hand tools, <br /> - dehydration or sun stroke of the personnel, <br /> - tripping on objects, and slipping on wet surfaces, <br /> - coming in contact with underground and overhead utilities. <br /> Health and Safety Plan Page 6 <br />