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portions of the equipment. In addition, personnel shall refrain from wearing loose jewelry or clothing, especially when in proximity to rotating tools. Personnel shall also wear hard hats and fluorescent safety vests. Also, carry an air horn whenever working in proximity to heavy equipment where the operator's full view of the work area is impeded. 3_2 Electrical/Utility Hazards Type(s)/Source: • Underground utilities • Overhead utilities Qualified Exposure Risk: Moderate Primary"Control": Isolation (Obtain utility clearance for all boring locations and be aware of overhead powerlines that may be in the way.) 3.2.1 Underground Utilities Hazard: Contact with electrical current can cause shock, electrical burns, and/or be instantly fatal. If heavy equipment (e.g., backhoe, drill rig) makes contact with electrical wires, it may or may not be insulated from the ground by the tires of the carrier. Under either circumstance, the human body, if it simultaneously comes in contact with the drill rig and the ground, will provide a conductor of the electricity to the ground. Control (s): Demarcate all drilling/digging locations, first. Contact Underground Service Alert (USA) (1-800-227-2600) and review as-built plans before performing any excavation/drilling/coring activity. It is advised that a private utility locator be contacted to supplement USAs demarcations, especially when the project is on private property. Soil intrusive work shall not proceed until all locating activities have been completed and fully documented in the site records. The initial site safety orientation meeting for all personnel on-site shall include a review of the underground utility locations and the location of the site map, showing the position of any underground utility lines. The site safety orientation shall include a site walkover of each marked utility or line. A pilot boring equal in diameter to the drilling equipment will be advanced to a minimum of 5 feet below ground surface using a posthole digger and/or hand auger prior to start of drilling operations for each boring advanced with a drill rig. The purpose of the pilot boring is to observe the potential presence of underground utilities not previously identified. Should personnel encounter a sub-surface condition that creates suspicion that there may be an unidentified underground line or utility, such individual shall immediately cease work, secure his/her equipment and notify the Project Manager and SSO. Project No.S8475-06-70 -8- April 25,2003