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any hazardous weather conditions. Hard hats and safety boots shall be wom at all times. Caution tape will be used to mark off the excavation. 5.7 ELECTRICAL EQUIPMENT AND GROUND FAULT CIRCUIT INTERRUPTERS All electrical equipment and power cables used in and around wells or structures containing chemical contamination must be explosion -proof and/or intrinsically safe and equipped with a three -wire ground lead that has been rated as explosion -proof for hazardous atmospheres (Class 1 Div 1&2). In accordance with OSHA 29 CFR 1926.404, approved ground fault circuit interrupters (GFCI) must be utilized for all 120 vault, single-phase, 15 -and 20 -amp receptacle outlets on the Site that are in use by employees and that are not part of the permanent wiring as defined by the NEC 1987. Receptacles on the ends of the extension cords are not part of the permanent wiring and therefore, must be protected by GFCPs whether or not the extension cord is plugged into pennanent wiring. The GFCI is a fast -acting circuit breaker that senses small imbalances in the circuit caused by current leakage to ground, and in a fraction of a second, shuts off the electricity. However, the GFCI will not protect the employee from line -to -line contact hazards such as a person holding two "hot" wires or a hot and neutral wire in each hand. The GFCI does provide protection against the most common form of electrical hazard, the ground fault. It also provides protection against fires, overheating, and destruction of wire insulation. GFCI's can be used successfully to reduce electrical hazards on construction sites. Tripping of GFCI's interruption of current flow, is sometimes caused by wet connectors and tools. It is good practice to limit exposure of connectors and tools to excessive moisture by using watertight or sealable connectors. Providing more GFCI's on shorter circuits can prevent tripping caused by the cumulative leakage from several tools or by leakages from extremely long circuits. (Adapted from OSHA 3007; Ground -Faulting Protection on Construction Sites - 1987.) 5.8 FIRE PROTECTION Only approved metal cans will be used to transport and store flammable liquids. All gasoline and diesel -driven engines requiring refueling must be shut down and allowed to cool before filling. No open flame or spark is allowed in any area containing petroleum products or other flammable liquids. Smoking is not allowed during any operations within the work area in which petroleum products or solvents in fi•ee-floating, dissolved or vapor forms, or other flammable liquids may be present. 3025-03/114700.4766.023/.TUL23'03 17