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D.10. ELECTRICAL WORK TASKS Applicable - Not Applicable, Not Anticipated Site-Specific Notes&Clarifications: Use of battery powered PID for air monitoring ® USE OF BATTERIES,BATTERY- ®Follow safe work practices to control hazards of voltage,shock,arcing,overheating,hazardous gases,irritant POWERED EQUIPMENT<50 V,OR electrolytes,secondary hazards. OTHER DC EQUIPMENT<50 V ! ®Prevent short-circuiting of terminals when battery is in use(segregated from tools,metal objects)and during Potential fire hazard(if terminals are transport(use battery transport container or install guard/cover on positive terminal). shorted),eye/skin hazards(when ❑For batteries requiring replenishment of electrolyte,use PPE for eye and skin protection,and have eyewash electrolyte is replenished),inhalation equipment at hand;see discussion of acids/caustics/corrosives in D.14."Commercial Chemical Products." hazard in enclosed spaces. ❑ "NORMAL OPERATION"OF ❑Follow"normal operation"requirements: ELECTRICAL EQUIPMENT CONNECTED ! * All electrical enclosures/guards/covers must be in place/closed/secured. TO AC OR DC POWER SOURCE>50 V: ! * Electrical equipment maintained per codes/standards/manufacturer's recommendations. Electrically powered tools,equipment, * Ensure no indication of damage or impending failure(heat,smoke,buzzing,odors,arcing,melting). machinery,extension cords,portable * Operate equipment in accordance with manufacturer's standard operating procedures. generators,working near electrical ! ❑Follow general electrical safety work practices to minimize shock hazard and secondary hazards: equipment. * Control water-related/wet-location hazards in a manner appropriate for the job tasks/equipment/tool. * Never touch electrical equipment if you are wet or standing/kneeling in water or on wet surfaces. Hazards: * Use extension cords/power cords properly,rated for use conditions and current draw,prevent damage. —Electrical shock * Inspect tool/equipment/extension cords/power cords before each use;remove from use if damaged. —Fire Hazard * Use GFCI-protected outlet or portable GFCI in wet/moist locations,outdoors,basements,concrete floors. —Secondary hazards(falls,other * Do not enter any space delineated by an electrical approach boundary. injuries). HANDS-ON DIAGNOSTICS/REPAIR ON ! ❑Implement electrical safe work practices pertaining to: CIRCUIT(S)CONNECTED TO POWER ! * Workers trained appropriately for the task. SOURCE<50 V: * Shock prevention measures. ❑AC ❑DC * Eye/skin protection for arcing hazards. ❑Battery and/or solar power * Protection from secondary hazards. ❑Capacitor(s) ❑Stray voltage from soil electrodes WORK WITHIN'APPROACH ! ❑Prepare project-specific written"Electrical Safety Program"addressing(at a minimum): BOUNDARY"OF EXPOSED, ! . Workers trained/designated as"Qualified Electrical Workers"per NFPA 70E(US)/CSA Z462(CAN) ENERGIZED(OR POTENTIALLY * Assess risks of electrical shock(voltage levels and sources),arc flash hazard and secondary hazards. ENERGIZED)CONDUCTORS AND/OR * Affix electrical hazard warning label to electrical enclosure(s)to be accessed. CIRCUIT PARTS CONNECTED TO * Physically delineate arc flash-or limited approach boundary,whichever is farthest from hazard source. POWER SOURCE 50-600 V*: * Only"qualified"workers allowed within approach boundaries;prevent entry by non-qualified personnel. ❑AC ❑DC ❑3-phase * Establish electrically safe working condition;work on live circuits prohibited(except for diagnostic testing). ❑Battery and/or solar power * Use PPE for shock/arc flash protection,as required. ❑Capacitor(s) * Use other safe procedures/equipment required for the task,such as lockout/tagout. ❑Induced voltage ❑Stray voltage>50V from soil electrodes *Working on>600 V not permitted for Geosyntec personnel LOCKOUT/TAGOUT(LO/TO)OF ! ❑Prepare site-specific written LO/TO program,and equipment-specific written LO/TO procedures(as ELECTRICAL ENERGY To prevent applicable);implement control procedures for hazardous energy sources,provide locks/tags,train workers, unplanned start-up or release of designate"authorized"personnel,notify"affected"personnel. energy when equipment is under maintenance/repair. WARNING! Confirmed or possible ®Follow safe work practices per D.11."Utility-Related Hazards." close proximity to OVERHEAD ELECTRICAL UTILITY LINES. HSE Program Documents:HSE SOP-434a:Overhead and Underground Utility Hazards(US-only), HSE SOP-452a:Lock-out/Tag-out(North America-only) HSE SOP-454a:General Electrical Safety(US-only) DA 1. UTILITY-RELATED HAZARDS Applicable . Not Applicable, Not Anticipated D.12. CONFINED/ENCLOSED SPACES(Including Hazardous Indoor Spaces) Applicable ® Not Applicable, Not Anticipated D.13. INFECTIOUS/PATHOGENIC BIOHAZARDS ® Applicable C� Not Applicable, Not Anticipated D.14. COMMERCIAL CHEMICAL PRODUCTS(per HAMOM or WHMIS) ® Applicable Not Applicable, Not Anticipated Site-Specific Notes&Clarifications: Decon solution used for equipment between wells.Preservatives including hydrochloric acid in sample bottles. PID calibration gas(100ppm isobutylene). Project/Task Name:Groundwater Gauging and Sampling THA ver.4.0 GeosMtec° THA Date:4/17/2025 Page 13 consultants