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Drillincf Procedures A di safe number must be obtained g prior to drilling from appropriate agency. A metal detector should be used before drilling on a site to determine presence of subsurface metal tanks and/or drums. During the drilling operation, two persons (one designated as "driller" and the other as "helper") must be present at all times. The helper (whether Groundwater Technology, 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 drilling operations whenever a hazardous situation is deemed present. The mast of the drilling rig should maintain a preferred clearance of 20 feet from any overhead electrical cables with 10 feet being the minimum clearance. All drilling operations will cease immediately during any hazardous weather conditions. Hard hats shall be worn at all times. Electrical Ecruipnent and Ground Fault Circuit Interrupters All electrical equipment and power cables used in and around wells or structures containing petrochemical 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 volt, single-phase, 15 and 20 amp receptacle outlets on the site which are in use by employees and which are not part of the permanent wiring as defined by the NEC 1987 . Receptacles can 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 cord is plugged into permanent wiring. -26-