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>23.0% STOP WORK,ventilate to lower 02 to<23%for re-entry. For persistent hazard,contact Corp.HSE Dept. IMPORTANT: Confirm sufficient oxygen is present(min.12%)to ensure accurate LEL readings. LEL(Lower <5%LEL Acceptable to continue working in work area;continue to monitor LEL. Explosive Limit) STOP WORK. Implement controls(reposition workers,ventilate,contain/eliminate source,etc.);resume >5%LEL work ONLY when LEL readings are<10%,sustained. <10 ppm Acceptable to continue work without H2S-focused respiratory protection. ❑ HzS i STOP WORK.Turn off drill rig and vehicles,Move upwind or out of the tank farm.Resume work ONLY after (Hydrogen Sulfide) >10 ppm readings reduced to<10 ppm c0 <25 ppm Acceptable to continue work without CO-focused respiratory protection. ❑ (Carbon >25 ppm STOP WORK.Turn off drill rig and vehicles,Move upwind or out of the tank farm.Resume work ONLY after Monoxide) — ;readings reduced to<25 ppm. WILDFIRE ---------------<150 In this Air Quality Index(AQI)range,it's acceptable to continue work without respiratory protection. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ ❑ SMOKE 151-500 Voluntary use of N95 respirator is appropriate. (AQI for PM 2.5) >500 STOP WORK,or use APR*with approval of HSE Dept. ❑ <OTHER> SITE-DERIVED ACTION LEVELS-Sustained breathing zone action levels;derived based on site contaminants;REVIEW WITH CORP.HSE DEPT.REQUIRED. <1.0 ppm i Acceptable to continue work without VOC-focused respiratory protection. Implement controls(reposition workers,ventilation,containment,eliminate source,etc.) to lower VOC >" ppm exposures to less than specified action level,or use APR*with approval of Corp.HSE Dept. VOcs :.................................................................................................................................................................................................................................................................................................................... ® (Volatile Organic X—X ppm Use APR*with VOC cartridges(yellow or black);do not exceed MUC**for respirator type;confirm Compounds) procedures for respirator usage with HSE Dept. .........................................................+........................................................................................................................................................................................................................................................ >1.0 ppm STOP WORK.Implement controls.For persistent levels greater than action level,contact PM and/or Corp HSE Dept. <X mg/m3 Acceptable to continue work without particulate-focused respiratory protection. AIRBORNE > mg/ma Implement controls(water spray,reposition workers,ventilation,containment,etc.)to lower dust levels to DUST less than specified action level,or use APR*with approval of HSE Dept. ❑ ( ----g/ Total X to X m m3 Use APR*with particulate cartridges appropriate for the hazard;do not exceed MUC**for respirator type; Particulates) E confirm procedures for respirator usage with HSE Dept. -------- -------- ------- ------ - ------- - ----- -- ---- >mg/m3 STOP WORK. Implement controls. For persistent levels greater than action level,contact PM and/or Corp HSE Dept. ❑ <OTHER> ----r------ ------------------------------------------------------------------------------------------------ *Air-purifying respirator ** Maximum use concentration ........................................................................................... ............................................................................................................................................................... HSE Program Documents: HSE SOP-460:Field Site Exposure Monitoring,HSE SOP-464:Lead Exposure Control, HSE SOP-466:Hydrogen Sulfide Exposure Control,Wildfire Smoke THA Addendum E.2. OTHER WORKER EXPOSURE MONITORING/SAMPLING ❑ Applicable ® Not Applicable, Not Anticipated E.3. FENCELINE/PERIMETER AIR MONITORING ❑ Applicable ® Not Applicable, Not Anticipated PART F-APPROVALS,ACKNOWLEDGEMENTS F.1.THA PREPARATION, REVIEW/APPROVAL SIGNATURES A THA is typically prepared by project staff,often with input from an HSC,with review/approval,at a minimum, by PM and/or Field Lead.Corporate HSE staff must be consulted as required or otherwise deemed appropriate*. Printed Name Signature Date PREPARER(S) Taleen Cochran 4/18/2025 Printed Name Signature Date Project/Task Name:Well Install, Development,and Destruction THA ver. aGeosyntec Consultants THA Date: 04/17/2025 Page 14