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re-evaluated by the Site Safety Officer and the Health and Safety Manager in order <br /> to determine the necessity of upgrading to Level B respiratory protection. <br /> 14.9 Electrical Equipment and Ground-Fault Circuit Interrupters <br /> All electric equipment and power cables in and around wells or structures suspected <br /> of containing chemical contamination must be intrinsically safe and equipped with a <br /> three-wire ground lead, reated explosion-proof for hazardous atmospheres. In <br /> accordance with OSHA 20 CFR 1926.404, approved ground fault circuit interrupters <br /> } (GFCI) must be used for all 120 volt, single phase, 15 and 20 ampere receptacle <br /> outlets on the site which are in use by employees. Receptacles on the ends of <br /> extension cords are not part of the permanent wiring and therefore, must be protected <br /> by GFCI's whether or not the extension cordis plugged into permanent wiring. <br /> J The GFCI is a fast-acting circuit breaker which senses small imbalances in the <br /> circuitcaused by current leakage to ground and, in a fraction of a second, shuts off the <br /> electricity. However, the GFCI will not protect the employee from line-to-line contact <br /> hazards ( such as a person holding two "hot' wires or a hot an neutral wire in each <br /> hand). The GFCI does provife protection against the most common form of electrical <br /> shock hazard - the ground fault. It also provides protection against fires, overheating <br />{� and destruction of insulation on wiring. <br /> GFCI's can be used successfully to reduce electrical hazards on construction sites. <br /> Tripping of GFCI's - interruption of current flow - is sometimes caused by wet <br /> connectors and tools. It is good practice to limit exposure of connectors and tools to <br /> excessive moisture by using watertight or sealable connectors. Providing more GFCI's <br /> or shorter circuits can prevent tripping caused by the cumulative leakage from several <br /> tools or by leakages from extremely long circuits. (Adapted from OSHA 307; <br /> Ground-Fault Protection on Construction sites, 1987.) <br /> 14.10 Damage to a Utility <br />' In the event an underground utility (gas, electric, sewer, water, phone, etc.) is struck <br /> in the course of subsurface drilling, the local utility shall be notified as soon as <br />' possible after any fire or injuries are addressed as listed above. <br /> 14.11 General Health <br /> Medicine and alcohol can increase the effects of exposure to toxic chemicals. Unless <br /> specifically approved by a qualified physician, prescription drugs should not be taken <br />' by personnel assigned to operations where the potential for absorption, inhalation or <br /> ingestion of toxic substances exists. <br /> Drinking alcoholic beverages is prohibited. Drinking alcoholic beverages and driving <br /> is prohibited at any time. Driving at excessive speeds is always prohibited. <br />' CRC Enviranmental Risk Management,Inc. Project#2100-250-2 <br /> American Savings Bank 272 !North El Dorado Street <br /> April 6, 1995 31 SWUM. California <br />