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............................................................................................ Carbon Monoxide) Im lement controls(reposition workers ventilate contain eliminate source scheduling,etc. to limit ❑ ( >25 ppm p ( p / g, ) exposures to<25ppm. For persistent levels>25ppm,STOP WORK,contact Corp.H&S Dept. <150 In this Air Quality Index(AQI)range,it's acceptable to continue work without respiratory protection. WILDFIRESMOKE —..................................................:...................................................................................................................................................................................................................................................................................................................................................................................... ® 151-500 Voluntary use of N95 respirator is appropriate. (A IforPM2.5 ........................................................................................ Q ) P..............................p............................................................................................................................................................................... >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. <15 ppmAcceptable to continue work without VOC-focused respiratory protection. Implement controls(reposition workers ventilation containment eliminate source etc. to lower VOC p ( p ) VOCs 15-50 ppm exposures to less than specified action level. ................................................................................................................ .................... .................................................................................................................................................................................................................................. ® (Volatile Organic Use APR*with VOC cartridges(yellow or black);do not exceed MUC**for respirator type;confirm Compounds) N/A procedures for respirator usage with Corp.H&S Dept. ................................................................................................ ........ .............. .................................................. >50 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. .......................................................................................:........ .............. .................................................................................................. > mg/m3 1 Implement controls(water spray,reposition workers,ventilation,containment,etc.)to lower dust levels to less than specified action level or use APR with approval of Corp.H&S De AIRBORNE DUST p pp t.p p (Total Particulates) X to X mg/ma Use APR*with particulate cartridges appropriate for the hazard;do not exceed MUC**for respirator type; 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-Ar8jonitHS-602-Lead HS-605-Hydrogen en Sulfide Wildfire Smoke THA Addendum E.2. OTHER WORKER EXPOSURE MONITORING 1 SAMPLING ® Applicable ❑ Not Applicable,Not Anticipated ®Heat/Cold Stress Testing/Monitoring El 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: Follow Geosyntec HS-124-Heat Stress Prevention procedures 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 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 Megan Houlihanp��` F 3/1/2022 BY: THA Printed Name Signature Date REVIEWED/ Kimberly Brandt I/, ,_ k�,� 1 3/2/2022 APPROVED BY: (Project Manager or Project Director,at a Joe Esseichick h� 3/4/2022 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 Project/Task Name:WR2501B; UST817B Investigation Geosyntec THA Date:3/4/2022 Page 11 consultants