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r� N MW _ T_ Chrjvron U.S.A. Inc. Site Safety Plan June 19, 1991 shut down the drilling operations whcn(.;var a hazardous situation its deemed present. Tho mast of the drilling rig nuat maintain a minimum clearance of 20 haat from any overhead €electrical cables. till drilling oporatio-yrs will cease Immediately during hazardoua weather condition:, ouch at; high winds, heavy rain, lightening and snow. Hart hats shall be worn at all tines. tt.aaring protection shall be worn during noisy operations. If product is oncountored during the drilling operation, all work oust atop in order for employees to upgrade porsonal protective equipment to Level C. A full-face respirator should be worn in order to prevent the inhalation of vapors and to provide face and eye protraction from aplauteos. Coated tyve;: suits, gloves, and overbooto should be worn to prevent akin contact with tate soil. Air monitoring must be performed in tl+e work area to document breathing-zone concentration,. If air monitoring ra:ults indicate concentrations greater than 750 ppm, then Level H ronpiratory protection will be implemented. Respirator cartridges must be changed at the and of a work period or if "breakthrough" occurs. If employers experience continuous cartridge "breakthrough", then the employees' work procedures and the level of respiratory protection must be re-evaluated by the Site Safety officer and the Health and S,-)futy Manager in order to determine the necessity of upgrading to LevelD respiratory protection. 9.7 Electrical Z D'"Mont_nna Ground-Fau1 circuit Interruatrara All electrical equipment and power cables in and around wells or structures suspected of containing chenical contamination must be intrinsically safe and equipped with a three-wire ground lead, rated explosion-proof for hazardous atmosphere,. In accordance with OSHA 29 CFR 2925.404, 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 employee.. 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 tho extension cord is plugged into permanent wiring. The GFCI Is a fest-acting circuit breaker which senses small imbalances in the circuit caused by current leakage to ground, and in a fraction of a second shuts off the electricity. However, the OFC1 will not protect the employee from line-to-line contact hazards (such as a person holding two "hot" wires or a hot and neutral wire in each hand) . The GFCI does provide protection against the most common fora of electrical shock hazard -- the ground fault. It also provides _ protection aga3,nut--Bras; _aveewhaatinq _ and destruction-ssf---i n ulzsts,an--on-----------._.__._ siring. 22