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<br /> ®Risk of incidental spill/release ❑Segregate incompatible chemicals during storage.
<br /> El Risk of emergency spill/release ®Locate emergency gear(eyewash,fire extinguisher,spill kit,safety signage)near storage area,as applicable.
<br /> ®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 ❑ Applicable Not Applicable, Not Anticipated
<br /> PART E-AIR MONITORING, WORKER EXPOSURE MONITORING
<br /> E.1. AIR MONITORING ❑ Applicable ® Not Applicable, Not Anticipated
<br /> E.2. OTHER WORKER EXPOSURE MONITORING/SAMPLING ❑ Applicable ® Not Applicable, Not Anticipated
<br /> E.3. 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
<br /> Megan Ogburn 4/25/2025
<br /> THA Printed Name Signature Date
<br /> REVIEWED/ Jessica Ramirez, Project Manager
<br /> APPROVED BY:
<br /> (Project Manager or PM-
<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 lockoutltagout controls Wear a respirator
<br /> Work at height near overhead electrical utility lines Enter a trench/excavation>5'deep Presence of"high-risk"contaminant(s)
<br /> Operate a UTV/ATV,aerial lift or fork-lift Function as a construction"Competent Person' Sustained exposure to wildfire smoke AQIPM 2.5>150
<br /> Tow a trailer on roadway Operate a pneumatic or powder-actuated tool Exposure to radioactive isotopes(a,0,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 /> Corporate HSE must also be consulted when Geosyntec subcontractors(under Geosyntec's oversight)perform high hazard/high risk work(such as demolition,blasting,crane critical
<br /> lifts, confined space entry, testing/maintenance of electrical systems, Iockout/tagout, HAZWOPER cleanup activities). Consultation with Corp. HSE is encouraged for all
<br /> questions/concems regarding worker safety,regulatory compliance,risk/liability aspects,or project-specific safety requirements.
<br /> **It is recommended that THAs be approved/signed by both the PM and Field Lead(or alternate PM designee),unless due to small scope/scale or routine nature of task,or staff
<br /> unavailability,only one approval is deemed sufficient by PM.Additional review and approval will be performed by Corp.HSE for high-hazard/high-risk tasks,or as otherwise requested.
<br /> HSE Program Documents:For more information,see"HSE STD-105,Proiect Safety Management Handbook".
<br /> Project/Task Name:Well Decommissioning/Former Olin Chlor Alkali Site,Tracy
<br /> Geosyntec° THA Date:04/28/2025 Page 10
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