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re-evaluated by the Site Safety Officer and the Health and Safety Manager in order to determine the necessity of upgrading to Level B respiratory protection. 14.9 Electrical Equipment and Ground-Fault Circuit Interrupters ' All electric equipment and power cables in and around wells or structures suspected of containing chemical contamination must be intrinsically safe and equipped with a three-wire ground lead, reated explosion-proof for hazardous atmospheres. In accordance with OSHA 20 CFR 1926.404, approved ground fault circuit interrupters (GFCI) must be used for all 120 volt, single phase, 15 and 20 ampere receptacle outlets on the site which are in use by employees. Receptacles on the ends of ' extension cords are not part of the permanent wiring and therefore, must be protected by GFCI's whether or not the extension cordis plugged into permanent wiring. ' The GFCI is a fast-acting circuit breaker which senses small imbalances in the circuitcaused 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 an neutral wire in each hand). The GFCI does provife protection against the most common form of electrical ' shock hazard - the ground fault. It also provides protection against fires, overheating and destruction of insulation on wiring. 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 or shorter circuits can prevent tripping caused by the cumulative leakage from several tools or by leakages from extremely long circuits. (Adapted from OSHA 307; ' Ground-Fault Protection on Construction sites, 1987.) 14.10 Damage to a Utility 1 In the event an underground utility (gas, electric, sewer, water, phone, etc.) is struck in the course of subsurface drilling, the local utility shall be notified as soon as ' possible after any fire or injuries are addressed as listed above. 14.11 General Health ' Medicine and alcohol can increase the effects of exposure to toxic chemicals. Unless specifically approved by a qualified physician, prescription drugs should not be taken ' by personnel assigned to operations where the potential for absorption, inhalation or ingestion of toxic substances exists. ' Drinking alcoholic beverages is prohibited. Drinking alcoholic beverages and driving is prohibited at any time. Driving at excessive speeds is always prohibited. CRC Environmental Risk Management,Inc. project#2100-250-2 American Savings Bank 222 North El Dorado Street ' April 6, 1995 31 Stockton,California