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----------- (Total X to X mg/m3 I Use APR*with particulate cartridges appropriate for the hazard;do not exceed MUC**for respirator type; Particulates) ;confirm procedures for respirator usage with HSE Dept. -------------------------------------------�--- -------------------- re-----r--------------------------------------H--------ep -------------------------------------------------------------------------------------------- >mg/m3 i STOP WORK. Implement controls. For persistent levels greater than action level,contact PM and/or Corp HSE Dept. ❑ <OTHER> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- *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,HSE SOP 470a Protection from Wildfire Smoke Exposure E.2. OTHER WORKER EXPOSURE MONITORING/SAMPLING — Applicable ❑ Not Applicable, Not Anticipated ®Heat/Cold Stress Testing/Monitoring E ❑Wildfire Smoke—Tracking AQI(Air Quality Index) ❑<Other> ❑Air Sampling(sample collection,passive dosimeter) ❑ Ionizing or Non-ionizing Radiation Testing ❑<Other> ❑Wipe/Bulk Sampling(to evaluate worker exposure) ❑Noise Testing Site-Specific Notes,Clarifications: HSE Program Documents:HSE STD-135:Hearing Protection Program,HSE STD-140:Radiation Safety Program,HSE SOP-230:Ionizing and Non-Ionizing Radiation Protection, HSE SOP-409:Heat Illness Prevention, HSE SOP-410:Cold Stress Prevention, HSE SOP-462:Asbestos Exposure Control, HSE SOP-464:Lead Exposure Control, HSE SOP-466:Hydrogen Sulfide Exposure Control,HSE SOP-468a:Respirable Crystalline Silica Exposure Control(US-only),HSE SOP 470a Protection from Wildfire Smoke Exposure E.3. FENCELINE/PERIMETER AIR MONITORING ❑ Applicable ® Not Applicable, Not Anticipated Fence line/perimeter air monitoring to be conducted in accordance with a separate"Perimeter Air Monitoring Plan"for this work;results from fence line/perimeter air monitoring shall NOT be used as the sole basis for determining work zone atmospheric hazards. Site-Specific Notes,Clarifications: 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 4/17/2025 THA Printed Name Signature Date REVIEWED/ Jason Gross 4/25/2025 APPROVED BY: (Project Manager or PM- Designee,at a minimum)** Elena Robertson 5/30/25 5/30/25 At a minimum,Corp.HSE must review/approve the THA review when Geosyntec staff will encounter"high hazards/high risks,"or perform critical tasks,such as(but not limited to): Work at heights>10',use personal fall apparatus Implement lockout/tagout controls Wear a respirator Work at height near overhead electrical utility lines Enter a trench/excavation>5'deep Presence of"high-risk"contaminant(s) Operate a UTV/ATV,aerial lift or fork-lift Function as a construction"Competent Person' Sustained exposure to wildfire smoke AQIPM 2.5>150 Tow a trailer on roadway Operate a pneumatic or powder-actuated tool Exposure to radioactive isotopes(a,131 y) Oversee a hot-work permit system "Qualified"Electrical testing&maintenance>50 V High-risk exposure to:non-ionizing(microwave,EMF,UV, Enter a hazardous confined/enclosed space High risk,non-typical infectious/pathogenic hazard IR)or ionizing(radio-isotope,x-ray)radiation. Use of unmanned aerial vehicle(drone) Derive action levels for VOCs or toxic dusts Onsite risk of emergency chemical spill High-risk ergonomic/musculoskeletal hazard Instrument monitoring for critical exposure risks Applicability of Chemical Anti-Terrorism Standards Project/Task Name: Well Maintenance THA ver. aGeosyntec° consultants THA Date:4/17/25 Page 17