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<150 In this Air Quality Index(AQI)range,it's acceptable to continue work without respiratory protection. i................................—....................................................................................................................................................................................................................................................................................................................................................................................................................................... WILDFIRESMOKE ; Voluntar use of N95 respirator is appropriate. ❑ i........................_151-500..............................<.............................._Y................................................._p..............................._ (AQI for PM 2.5) >500 STOP WORK,or use APR*with approval of Corp.H&S Dept. ❑ <OTHER> ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................. SITE-DERIVED ACTION LEVELS—Sustained breathing zone action levels;derived based on site contaminants;REVIEW WITH CORP.H&S DEPT.REQUIRED. <X ppm Acceptable to continue work without VOC-focused respiratory protection. > m ...........-,........ ........................................ .................... Implement controls(reposition workers,ventilation,containment,eliminate source,etc.) to lower VOC VOCs pp exposures to less than specified action level,or use APR*with approval of Corp.H&S Dept. .......................................................................................❑ <...................................................................................................................................................................................................................................................................................................................................................................................... (Volatile Organic Use APR*with VOC cartridges(yellow or black);do not exceed MUC**for respirator type;confirm Compounds) X to X ppm procedures for respirator usage with Corp.H&S Dept. >X ppm STOP WORK. Implement controls,for persistent levels greater than action contact Corp H&S Dept. <X mg/m3 Acceptable to continue work without particulate-focused respiratory protection. .I......................................................................................:...................................................................................................................................................................................................................................................................................................................................................................................... > m m3 Implement controls(water spray,reposition workers,ventilation,containment,etc.)to lower dust levels to g/ less than specified action level or use APR with approval of Corp.H&S Dept. AIRBORNE DUST _........................_;...................................._p...............................................................c..............................................................._pp......................................_p............................_p................................................................................................................... (Total Particulates) Use APR*with particulate cartridges appropriate for the hazard;do not exceed MUC**for respirator type; X to X mg/m3 confirm procedures for respirator usage with Corp.H&S Dept. >mg/m3 STOP WORK. Implement controls. For persistent levels greater than action level,contact Corp H&S Dept. ❑ <OTHER> .......................................................................................<...................................................................................................................................................................................................................................................................................................................................................................................... *Air-purifying respirator ** Maximum use concentration ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Geosyntec Procedures: HS-111-Air Monitoring,HS-602-Lead,HS-605-Hydrogen Sulfide,Wildfire Smoke THA Addendum E.2. OTHER WORKER EXPOSURE MONITORING 1 SAMPLING -j Applicable ® Not Applicable, Not Anticipated ❑Heat/Cold Stress Testing/Monitoring ❑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 workerexposure) € ❑ Noise Testing Site-Specific Notes,Clarifications: Geosyntec Procedures: HS-109-Hearing Protection,HS-111-Air Monitoring,HS-124-Heat Stress Prevention,HS-125-Cold Stress Prevention HS-126-Radiation Safety Program,HS-128-Ionizing and Non-ionizing Radiation,HS-601-Asbestos, HS-602-Lead HS-604-Respirable Crystalline Silica,HS-605-Hydrogen Sulfide E.3. FENCELINE 1 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 or PD. Corporate H&S staff must be consulted as required or otherwise deemed appropriate". Printed Name Signature Date THA PREPARED BY: THA Printed Name Signature Date REVIEWED/ APPROVED BY: (Project Manager or Project Director,at a minimum) *At a minimum,Corp.H&S 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): Climb ladders to heights>10' Implement lockout/tagout controls Instrument monitoring for critical exposure risks Use a personal fall apparatus Enter a trench/excavation>5'deep Wear a respirator Self-perform tasks classified as construction labor Work near heavy equipment or crane Presence of"high-risk"contaminant(s) Project/Task Name: Geosynte& THA Date: Page 13 consultants