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equipment is operated. Excess noise levels can be estimated using the following rule of thumb. When normal voice communication is not possible between field personnel who are no more than three feet apart, hearing protection will be utilized. Hearing protection typically involves the use of disposable ear plugs for the duration of the excessive noise level and will be used during drilling operations and other operations that present a noise hazard. Utility Lines and Buried Objects All field vehicles and equipment will be maintained at a minimum distance of 10 feet, in 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 will be increased by 4 inches for every 10 kv over that voltage. The location and marking of such lines and equipment will be coordinated with Underground Utility Alert prior to the start of field activities. Excavations Excavations deeper than five feet will either have shoring with ladder ingress/egress benched or sloped walls as per current OSHA regulations. Sunburn Working outdoors on sunny days for extended periods of time can cause sunburn. Excessive exposure to sunlight is associated with the development of skin cancer. Field staff will take precautions to prevent sunburn by using sun-screen lotion and/or wearing hats and long-sleeved garments. [feat 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. Indications of heat stress are: profuse sweating, ashen color, and weakness. When these symptoms appear, the individual should cease working, go to a cool place, and drink as much cool water as possible. If the individual collapses, faints, or begins to vomit,emergency personnel should be contacted and he/she should be given immediate medial attention. Hypothermia/Frost Bite Working in the winter can create exposure problems associated with hypothermia and frost bite. Personnel that are excessively shivering or with white patches on exposed areas should immediately cease working and proceed indoors or to a warm area. J. COMMUNICATION PROCEDURES If due to the close proximity of field crew members, the necessity for radio communication may be alleviated. The following standard hand signals may be used if deemed appropriate by the Field Team Leader: Hand drawn across throat......................................... Cease operation immediately Hand gripping throat................................................ Out of air,can't breath Hand on top of head................................................. Need assistance Thumbs up................................................................ Ok, I am all right, understood Thumbsdown........................................................... No, negative