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APP/SSHP Soil Excavation at California National Guard Armory Lodi, California All electrical equipment must use a ground fault circuit interrupter system or an assured equipment grounding program as required in 29 CFR 1926.405(j)(1)(iii)(A-D). Electrical equipment must be stored in a dry area and must not be used outside in the rain. Electrical hazards associated with intrusive investigation tasks include contact with buried utility lines or overhead power transmission lines as well as lightning strikes during electrical storms. In the event that electrical power lines with 750 volts or higher are present within work areas, OTIE will coordinate with the RPM to obtain the necessary permits before performing work in the vicinity of the lines. During heavy equipment operations, the equipment and any overhead power transmission lines will be separated by at least 10 feet. In the event of a lightning storm, equipment operation will be halted, and personnel will maintain at least a 10-foot distance from the equipment. Safe working distances from power lines for drill rigs/heavy equipment are indicated in Table 2 (from Table 11-1 in EM 385-1-1, 15 September 2008). Table 2. Minimum Clearance from Energized Overhead Electric Lines* (All dimensions are distances from live part to employee) Voltage Minimum rated clearance (Nominal, kV, alternating current) feet(meters) 0to50 10ft(3m) 51 to 200 15 ft(4.6 m) 201 to 350 20 ft(6 m) 351 to 500 25 ft(7.6 m) 501 to 650 30 ft(9.1 m) 651 to 800 35 ft(10.7) 801 to 950 40 ft(12.2 m) 951 to 1100 45 ft(13.7 m) *Clearance values calculated using: (Initial kV-50kV) x (4 in/10kV) x (1 ft/12 in) = increased distance (ft) over 10 ft. Add this value to 10 ft to yield minimum rated clearance. 4.5.2 Heavy Equipment Operation The operation of heavy construction equipment poses the most common threat to ground-based personnel on any excavation or construction project. The ability for ground-based personnel to be "hidden"from an equipment operator in the many "blind spots"that typical construction equipment inherently possesses is significant. The ability for ground-based personnel to emerge from a blind spot "unnoticed" by an equipment operator involved with his current "task at hand" is also significant. All employees entering an active "work area"will be required to wear high visibility fluorescent orange or yellow safety vests in addition the required hard hats, safety glasses, and steel-toed safety shoes. At this site, heavy equipment is not expected, beyond drill rig operations. In the instance of neighboring work with heavy equipment by other contractors or Shipyard personnel, OTIE employees will be aware of safety hazards of these activities. OTIE 11