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`Airborne TWA established by Cal/OSHA and published in Title 8 California Code of Regulations Section 5155. Physical Hazards Nonchemical hazards are safety hazards associated with heavy equipment including drill rigs, other equipment used for sampling, slips, trips, falls, uneven terrain, lifting equipment in and out of trucks, heat stress depending on time of year and weather conditions, noise, and possible electrical hazards. The work location will be in the middle lane of two-way traffic. As a result, traffic is a potential hazard. The subcontractor will supply all traffic control devices. This will include traffic cones, flagging, and signs. In addition, each member will wear a traffic safety vest for visibility. Noise Noise is a potential hazard in areas where heavy equipment including drill rigs, power tools, or generators are operated. Heavy equipment operation may produce noise levels that reach or exceed 85 decibels (dBA), the action level established by the OSHA. Elevated noise levels will be evaluated by the SSO when the drill rig is operated. Exposure to elevated noise levels can lead to temporary or permanent hearing loss, and can also cause muscle tension and irritability. The SSO will ensure hearing protection is utilized when noise levels are elevated, e.g. when the drill rig is in operation. The rule of thumb to follow for evaluating noise levels is when a conversation cannot be held within 3 feet hearing distance. Utility Lines The Underground Service Alert (USA) will be contacted a minimum of 48 hours before field activities involving underground disturbance begin. USA will notify private utility companies about their responsibility to locate and mark all buried utility lines. USA can be reached through an 800 number which is listed in the white pages for the local area. All field vehicles and heavy equipment will be maintained at a minimum distance of 10 feet in all vertical and horizontal directions from all electrical power lines (energized lines) and/or electrical equipment with a voltage less than or equal to 50 kilovolts (kV). If the voltage exceeds 50 kV, the clearance shall be increased by 4 inches for every 10 kV over that voltage. Sunburn Working outdoors on sunny days for extended periods of time can cause sunburn to the skin. Excessive exposure to sunlight is associated with the development of skin cancer. Field staff should take precautions to prevent sunburn by using sun-screen lotion and/or wearing hats and long-sleeved garments. Heat Stress The potential for heat stress is a concern when field activities are performed on warm, sunny days, and is accentuated when chemical protective clothing is worn. Heat stress prevention measures and monitoring will be implemented if ambient temperatures are above 70 degrees Fahrenheit(F). 5 01/31/991E'.UfEMOSV.0922092-MSSH-GPC DOC