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Utility Innes The Underground Service Alert (USA) will be contacted a mnrumum of 48 hours before field activities begin. USA will notify pnvate 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 honzontal 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 Workmg 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 sunscreen 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 site temperatures are above 70 degrees Fahrenheit (F). Precautions to prevent heat stress will include work/rest cycles so that rest periods are taken before excessive fatigue occurs, and regular intake of water to replace that lost from sweating. Worktrest cycles will be based on momtonng the heart rate (pulse) of each individual worker. Rest breaks will be long enough to reduce the heart rate (HR)below levels calculated according to the following method: 1. i The worker will initially determine their resting HR prior to starting work activities. 2. At the start of the first rest penod, the worker will determine their HR. This initial HR should not exceed the individual's age-adjusted maximum HR, which equals [(0.7)(220- age in years)]. At 1 minute into the rest period, the recovery HR will be determined. The recovery HR should not exceed 110 beats per minute. F 3. If the uutial HR exceeds,the,age-adjusted maxnmum'HR, or the 1-minute recovery ' HR is greater than `,110 beats r,minute, then the next work nod will b I per pe e , decreasedk by 10'minutes: I , 'k l I i 09IW➢%2.NA�'OfCl SV I J�31�.7_WP5 +�u ,I11 i