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6.6 NOISE HAZARDS <br /> Past experience has shown that the use of heavy equipment for investigations may <br /> generate noise levels at or above the Cal/OSHA action level of 85 dBA (decibels <br /> measured on A scale) measured within the worker's hearing zone. If normal <br /> conversation is impeded, personnel of PSI and its subcontractors will wear hearing <br /> protection. <br /> 6.7 SOLAR RADIATION HAZARD <br /> Ultraviolet rays (UV) from the sun can damage the exposed areas of the skin and cause <br /> the skin to become hot or even burn. The American Conference of Governmental <br /> Industrial Hygienists (ACGIH) has established UV guidelines. Tanned individuals can <br /> tolerate skin exposure in excess of the threshold limit value (TLV) without experiencing <br /> inflammatory redness of the skin. However, such conditioning may not protect persons <br /> from exposure to skin cancer. Therefore, for all work performed outside on sunny days, <br /> personnel of PSI and its subcontractors will be required to apply a sunscreen designed <br /> to protect the exposed areas of the skin from the sun. <br /> 6.8 VIBRATIONS <br /> Vibrations can result from the use of mechanical equipment and can cause blanching of <br /> the fingers, numbness and could be chronic (Raynaud's Syndrome). The effects of <br /> vibrations on the body are complex and affect individuals differently. Because of the <br /> vibration hazard, PSI and its subcontractors are required to take frequent breaks or <br /> preferably wear antivibration (leather) work gloves during the operation of vibration <br /> equipment. <br /> 6.9 BIOLOGICAL HAZARDS <br /> No biological hazards are expected. <br />