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IkIFerA%klveoil/JVC. SACRAMENTO 5.6 Drilling Procedures { To determine presence of subsurface metal tanks and/or drums, -a:metal-detector should be used before drilling at a site. During the drilling operation, two persons (one designated as "operk,ator"'and the other as the "supervisor") must be present at alT times': The supervisor (whethe'r Versar, Inc. personnel or subcontractors) must be instructed as to the whereabouts`of the emergency shut-off switch. Every attempt must be made to keep unauthorized personnel 1� from entering the work area. ,If this is not possible, the operation should be shut down until the area is cleared. The:Site Safety Officer or the.Field Team Leader has the authority and responsibility to''shut down the excavation operations whenever a hazardous situation is deemed'present. The mast of the drill should maintain a preferred clearance of 20 feet from.any overhead electrical cables, with 10 feet being the minimum. All excavation operations will immediately cease during any hazardous weather conditions. Hard hats shall be worn at all times. 5.7 Electrical Equipment and Ground Faultt:Circuit Interrupters E All electrical equipment and power cables used in:and around excavations 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 dri 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 GFCI's whether or not the extension cord is plugged into.permanent wiring. 16