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Ifiernmrc. ' - if SCBA is worn under the suit, remove the chemical resistant suit, then the SCBA - remove hard hat 5.6 Drilling Procedures During the dnllmg operation, 1w persons (one designated as "operator" and the other as the "supervisor") must be present at all times The supervisor (whether 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 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 All drilling equipment should maintain a preferred clearance of 20 feet from any overhead electrical cables, with 10 feet being the minimum All excavation operations will lie immediately cease during any hazardous weather conditions Hard hats shall be worn at all times Gmund Fault Circum Irate is 5.7 Dechical Equipment and 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 on the site that are in use by employees and that are not part of the permanent wiring as defined by the National Electrical Code (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