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❑Contagious respiratory illness ®Implement vector-protective measures(see also Section D.1.b.,"Biological Hazards")
<br /> ®Vector-borne infectious risk ®Use"Standard/Universal Precautions"as applicable to mitigate exposures to infectious/pathogenic hazards.
<br /> ❑Wastewater,sewer,landfill ®Low hazard—use basic hygiene:onsite hand washing(soap&water preferred)and protective apparel/PPE.
<br /> El Animal/human waste ElMed/high hazard—added PPE(gloves/barriers/respirator/dust mask),decon,remediation,as appropriate.
<br /> ❑Wildlife contact,infectious risk ❑For bloodborne human pathogens follow Bloodborne Pathogen Program and Standard/Universal Precautions.
<br /> ❑Mold,fungi,valley fever ElContact HR Dept.for project-specific immunization(e.g.tetanus/diphtheria/pertussis[Tdap],hepatitis A/B).
<br /> ❑Implement remedial actions to mitigate infectious hazard source(remove syringes,clean up unsanitary
<br /> ❑Bloodborne pathogens waste/debris,decon/disinfect surfaces,etc.)as appropriate for the scope/scale of work.
<br /> ❑Discarded syringes
<br /> ❑Medical waste HSE Program Documents:HSE SOP-240:Mitigating Respiratory Illness Transmission in the Workplace,
<br /> ®Other(describe above) HSE SOP-408:Biting/Stinging Arthropods and Poisonous Plants, HSE SOP-612a:Bloodborne Pathogens(US-only)
<br /> D.14. COMMERCIAL CHEMICAL PRODUCTS (per HAZCOM or WHMIS) Applicable ® Not Applicable, Not Anticipated
<br /> D.15. SITE CONTAMINANTS, CHEMICAL WASTES ® Applicable ❑ Not Applicable, Not Anticipated
<br /> Site-Specific Notes&Clarifications:Site groundwater COCs are chloroform and carbon tetrachloride.An NFA was issued for soil in 2000 and a conditional NFA
<br /> has been issued for groundwater in April 2026 pending MW destruction.The only detections above MCLs are currently observed at MW-12 for carbon tetrachloride
<br /> (MCL at 0.5 µg/L,detected at 1.3 µg/L in 2025).IDW is not expected to be generated in this scope.
<br /> CHECK ALL THAT APPLY. Provide site-specific notes/clarifications above.
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<br /> ®Soil/groundwater contaminants(historical release) ❑Explosive dust ❑Potential for flammable gas(methane)
<br /> ❑Recent release,known high concentrations ❑Oxygen deficiency ❑Corrosive,acids/caustics,strong irritants
<br /> ❑Former chemical disposal site,landfill ®Chlorinated volatile organic compounds(VOCs) ❑Asbestos abatement work
<br /> ❑Urban fill,residual contaminants ❑BTEX,petroleum derived VOCs ❑Pesticides,herbicides,fungicides
<br /> ElContainerized waste(drums,process equipment) ❑Fuel oils,petroleum,waste oil,lubricants ❑Sensitizers
<br /> ❑Buried drums(known or potential) ❑Metals,metal compounds,metal dusts ❑Radioactive contaminants
<br /> ❑Large containers,potential for spills El Elemental mercury ❑Controlled substances,drugs
<br /> ❑Contaminated building surfaces ❑Polyaromatic hydrocarbons(PAHs) ❑Wildfire smoke,see THA Addendum
<br /> ❑Unexploded ordnance ❑Potential for flammable vapors ❑Other-describe above
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<br /> NOTE:For sites with one or more"high-risk contaminants"(below)designated/recognized as a contaminant of concern,or exceeding an environmental reporting
<br /> threshold,or representing a potential exceedance of an action level or exposure limit,the THA must be reviewed by the HSE Dept.before initiating the work:
<br /> ElAsbestos El Chromium VI hexavalent chromium El -1
<br /> ( )
<br /> ❑Arsenic/arsenic compounds ❑Crystalline Silica(airborne) ❑Methylene chloride
<br /> ❑Benzene ❑Dioxins ❑Polychlorinated biphenyls(PCBs)
<br /> ❑Beryllium ❑Mercury ❑Vinyl chloride
<br /> ❑Cadmium ❑Hydrogen Cyanide(HCN)
<br /> FOR WORK CONSISTING OF CLEANUP OPERATIONS,CORRECTIVE ACTIONS,PRELIMINARY INVESTIGATIONS at an"UNCONTROLLED HAZ.WASTE SITE"
<br /> (per HAZWOPER,29 CFR 1910.120 or equivalent),delineate procedures in"Site-Specific Notes and Clarifications"(or attachments)addressing the
<br /> following,as applicable to the work:
<br /> — Workers attend pre-work orientation on hazards,risks,onsite safety measures,emergency contingencies.
<br /> — Implement site control plan-delineate Exclusion Zone(s),Contaminant Reduction Zone(s),Support Zone(aka EZ,CRZ,SZ).
<br /> — Include site map/figure depicting work locations and other relevant site-specific information.
<br /> — Site workers in EZ or CRZ shall have 40-hour HAZWOPER training,current 8-hour refresher,3 days supervised field experience.
<br /> — Site supervisor(s)shall have 8-hour Supervisor training.
<br /> — Site workers in EZ or CRZ shall participate in medical monitoring program,as applicable.
<br /> — Implement site-specific procedures for worker protection via engineering controls,work practices,personal protective equipment(PPE),air
<br /> monitoring,decontamination procedures,spill containment,emergency preparedness and response.
<br /> — Conduct air monitoring,as appropriate;see Part E,"Air Monitoring,Worker Exposure Monitoring."
<br /> — PPE program:Specify Levels of Protection and specific PPE to be used for applicable tasks;
<br /> o Level D:No respirator,no chemical protective clothing,standard work clothes,basic PPE;(COVID-19 face covers allowed)
<br /> o Modified Level D:No respirator,chemical protective clothing as appropriate;(COVID-19 face covers allowed)
<br /> o Level C:Air-purifying respirator,chemical protective clothing as appropriate;consult with Corp.HSE Dept.required.
<br /> o Level B:Air-supplied respirator,chemical protective clothing/suit as appropriate;consult with Corp.HSE Dept.required.
<br /> o Level A:Fully encapsulating suit,self-contained breathing apparatus(SCBA);Level A prohibited for Geosyntec personnel.
<br /> ® FOR SITE WITH CHEMICAL CONTAMINANTS OR WASTE BUT NOT REGULATED BY HAZWOPER
<br /> — Workers shall be knowledgeable/aware of chemical hazards thru safety training/orientation and availability of hazard information.
<br /> — Implement controls to minimize worker exposure through engineering controls,work practices,PPE,decon,as appropriate.
<br /> — Evaluate worker exposure via air monitoring/sampling,as applicable;see Part E,"Air Monitoring,Worker Exposure Monitoring."
<br /> ® STORAGE/TRANSPORT OF IDW* ®Describe site-specific procedures above for spill containment,container handling,as applicable.
<br /> Spill/Release Risk: ®For liquids,provide secondary containment during storage.
<br /> ®Risk of incidental spill/release ❑Segregate incompatible chemicals during storage.
<br /> ❑Risk of emergency spill/release ®Locate emergency gear(eyewash,fire extinguisher,spill kit,safety signage)near storage area,as applicable.
<br /> Project/Task Name:Well Decommissioning/Former Olin Chlor Alkali Site,Tracy
<br /> Geosyntec THA Date:5/12/2026 Page 11
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