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❑O For incidental spills;spill kit on-site for low-hazard releases(low-flammability/toxicity/quantity/volatility)
<br /> *Investigation-Derived Waste ❑ For emergency spills:describe spill/release hazard and response plan/procedure above,and indicate
<br /> Emergency response contact in Part B,"Emergency Response and First Aid.'
<br /> ❑DOT/TDG/IATA-Regulated transport:see D.17."Hazmat/Dangerous Goods Shipping/Transportation."
<br /> : OFF-SITE MIGRATION OF AIRBORNE ❑ Implement controls to minimize hazard migration(dust suppression,covers,foam,etc.).
<br /> CONTAMINANTS ❑Community/perimeter air monitoring will be conducted per perimeter air monitoring plan;see E.3"Fence
<br /> Line/Perimeter Air Monitoring."
<br /> HSE Program Documents:HSE STD-120:Occupational Medical Management Program,HSE STD-125:Personal Protective Equipment Program,
<br /> HSE STD-130:Respiratory Protection Program,HSE STD-145:Safety Training Program,HSE STD-150:Globally Harmonized System for Hazard Communication, HSE
<br /> SOP-301a:Contaminated Site Investigation&Remediation(US-only),HSE SOP-460:Field Site Exposure Monitoring,
<br /> HSE SOP-634:Drum Sampling,HSE SOP-636:Handling of Uncharacterized Hazardous Waste Containers,THA Addendum on Wildfire Smoke
<br /> D.16. RADIATION HAZARDS (Other than Sunlight) ❑ Applicable ® Not Applicable, Not Anticipated
<br /> D.17. SHIPPING/TRANSPORTATION HAZMAT/DANGEROUS GOODS C Applicable ® Not Applicable, Not Anticipated
<br /> PART E-AIR MONITORING, WORKER EXPOSURE MONITORING
<br /> E.I. AIR MONITORING ❑ Applicable ® Not Applicable, Not Anticipated
<br /> E.2. OTHER WORKER EXPOSURE MONITORING 1 SAMPLING Applicable ❑ Not Applicable, Not Anticipated
<br /> ® Heat/Cold Stress Testing/Monitoring ❑Wildfire Smoke—Tracking AQI(Air Quality Index) ❑<Other>
<br /> ❑Air Sampling(sample collection,passive dosimeter) ❑ Ionizing or Non-ionizing Radiation Testing ❑<Other>
<br /> ❑Wipe/Bulk Sampling(to evaluate workerexposure) ❑ Noise Testing
<br /> Site-Specific Notes,Clarifications: Follow procedures in HSE SOP 409 if working in temperatures>80F.
<br /> HSE Program Documents:HSE STD-135:Hearing Protection Program,HSE STD-140:Radiation Safety Program,HSE SOP-230:Ionizing and Non-ionizing Radiation Protection,
<br /> HSE SOP-409:Heat Illness Prevention, HSE SOP-410:Cold Stress Prevention, HSE SOP-462:Asbestos Exposure Control, HSE SOP-464:Lead Exposure Control,
<br /> HSE SOP-466:Hydrogen Sulfide Exposure Control,HSE SOP-468a:Respirable Crystalline Silica Exposure Control(US-only),,Wildfire Smoke THA Addendum
<br /> FENCELINE/PERIMETER AIR MONITORING ❑ Applicable ® Not Applicable, Not Anticipated
<br /> PART F-APPROVALS, ACKNOWLEDGEMENTS
<br /> F.1.THA PREPARATION, REVIEW/APPROVAL SIGNATURES A THA is typically prepared by project staff,often with input from an HSC,with
<br /> review/approval,at a minimum,by PM and/or Field Lead.Corporate HSE staff must be consulted as required or otherwise deemed appropriate*.
<br /> Printed Name Signature Date
<br /> PREPARER(S) Zizheng Qu CT_ 4/27/2026
<br /> THA Printed Name Signature Date
<br /> REVIEWED/ Jessica Ramirez, Project Manager �/ 4/27/2026
<br /> APPROVED BY:
<br /> (Project Manager or PM- Thom Henri, HSC 5/11/2026
<br /> ** i
<br /> Designee,at a minimum)
<br /> *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):
<br /> Work at heights>10',use personal fall apparatus Implement lockout/tagout controls Wear a respirator
<br /> Work at height near overhead electrical utility lines Enter a trench/excavation>5 deep Presence of"high-risk"contaminant($)
<br /> Operate a UTV/ATV,aerial lift or fork-lift Function as a construction"Competent Person" Sustained exposure to wildfire smoke AQIPM 2 e>150
<br /> Tow a trailer on roadway Operate a pneumatic or powder-actuated tool Exposure to radioactive isotopes(a,R,y)
<br /> Oversee a hot-work permit system "Qualified"Electrical testing&maintenance>50 V High-risk exposure to:non-ionizing(microwave,EMF,UV,
<br /> Enter a hazardous confined/enclosed space High risk,non-typical infectious/pathogenic hazard IR)or ionizing(radio-isotope,x-ray)radiation.
<br /> Use of unmanned aerial vehicle(drone) Derive action levels for VOCs or toxic dusts Onsite risk of emergency chemical spill
<br /> High-risk ergonomic/musculoskeletal hazard Instrument monitoring for critical exposure risks Applicability of Chemical Anti-Terrorism Standards
<br /> Q Project/Task Name:Well Decommissioning/Former Olin Chlor Alkali Site,Tracy
<br /> Geosptee THA Date:5/12/2026 Page 12
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