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❑ (Oxygen) <19.5% STOP WORK,ventilate to raise 02 to>19.5%for re-entry. For persistent hazard,contact Corp.HSE Dept.
<br /> >23.0% STOP WORK,ventilate to lower 02 to<23%for re-entry. For persistent hazard,contact Corp.HSE Dept.
<br /> IMPORTANT: Confirm sufficient oxygen is present(min.8-12%)to ensure accurate LEL readings.
<br /> ... ........�.......... .....................- ........................................................... ............
<br /> Ei LEL(Lower <109'o LEL ............. .......................... ..............
<br /> Acceptable to continue working in work area;continue to monitor LEL.
<br /> Explosive Limit)
<br /> >10%LEL STOP WORK. Implement controls(reposition workers,ventilate,contain/eliminate source,etc.);resume
<br /> work ONLY when LEL readings are<10%,sustained.
<br /> I <I PPM Acceptable to continue work without H2S-focused respiratory protection.
<br /> Implement controls(reposition workers,ventilate,contain/eliminate source,scheduling,etc.)to limit
<br /> Ei H2S 1 1-10 ppm exposures to<1ppm,or use APR*with VOClacid-gas cartridges(yellow);do not exceed MUC*for respirator
<br /> I type;confirm acceptability of respirator usage with HSE Dept.
<br /> (Hydrogen Sulfide) r Dept_........................
<br /> Implement controls(reposition workers,ventilate,contain/eliminate source,scheduling,etc.)to limit
<br /> >10 ppm s exposures to<10ppm(with respirator),or<Ippm(without respirator). For persistent levels>10 ppm,STOP
<br /> WORK,contact task lead,PM or HSE Dept.
<br /> CO <25 ppm Acceptable to continue work without CO-focused respiratory protection.
<br /> ............ ................ ......................
<br /> ❑ (carbon i Implement controls(reposition workers,ventilate,contain/eliminate source,scheduling,etc.)to limit
<br /> >Monoxide) 25 ppmexposures to<25ppm. For persistent levels>25ppm,STOP WORK,contact PM and/or HSE Dept.
<br /> <69 respiratory protection.
<br /> .... .. ....... .............................................................
<br /> _quality Index(AQI)range,it's acceptable to continue work without respirato
<br /> >69—<100 Voluntary use of N95 respirator is appropriate.
<br /> Distribute N95 respirators to all personnel
<br /> WILDFIRE i Provide work and/or rest areas in enclosed buildings.
<br /> I Relocate work indoors,or to an outdoor location with a lower AQI;
<br /> ❑ SMOKE i
<br /> i >101—<500 Changing work schedules so outdoor work can occur when the AQI is lower;
<br /> (AQI for PM 2.5) i
<br /> I I Providing portable HEPA filters in enclosed areas;
<br /> Reduce the amount of work that involves physical exertion,and provide additional rest periods.
<br /> Consider rescheduling fieldwork to a date/time when the AQI is likely to be lower.
<br /> >500 STOP WORK,or use APR*with approval of HSE Dept.
<br /> <OTHER
<br /> SITE-DERIVED ACTION LEVELS—Sustained breathing zone action levels;derived based on she contaminants;REVIEW WITH CORP.HSE DEPT,REQUIRED,
<br /> <5 PPM Acceptable to continue work without VOC-focused respiratory protection.
<br /> Vocs ........... ........... ................. ..............
<br /> Implement controls(reposition workers,ventilation,containment,eliminate source,etc.) to lower VOC
<br /> (Volatile Organic >5 PPM exposures to less than specified action level,or use APR*with approval of Corp.HSE Dept.
<br /> Compounds) >10 ppm STOP WORK. implement controls,for persistent levels greater than action contact PM and/or HSE Dept.
<br /> <X Mg/M3 j Acceptable to continue work without particulate-focused respiratory protection. ............ ............
<br /> ........... ................. .......
<br /> AIRBORNE 1 > " Mg/M3 Implement controls(water spray,reposition workers,ventilation,containment,etc.)to lower dust levels to
<br /> DUST less than specified action level,or use APR*with approval of HSE Dept.
<br /> ❑ (Total Xtox Mg/M3
<br /> Use APR*with particulate cartridges appropriate for the hazard;do not exceed MUC**for respirator type;
<br /> i confirm procedures for respirator usage with HSE Dept.
<br /> Particulates) ............... ............... .................... .....................
<br /> >Mg/M3 STOPWORK. Implement controls. For persistent levels greater than action level,contact PM and/or Corp
<br /> HSE Dept.
<br /> F] <OTHER>
<br /> Air-purifying respirator **Maximum use concentration
<br /> ........... ...................... ............
<br /> HSE Program Documents: HSE SOP-460:Field Site Exposure Monitoring HSE SOP-464:Lead Exposure Contra
<br /> HSE SOP-466:Hydrogen Sulfide Exposure_Control HSE SOP 470a Protection from Wildfire Smoke Exposure
<br /> E.2. OTHER WORKER EXPOSURE MONITORING/SAMPLING 0 Applicable 11 Not Applicable,Not Anticipated
<br /> 0 Heat/Cold Stress Testing/Monitoring I El Wildfire Smoke—Tracking AQI(Air Quality index) i0<Other>
<br /> El Air Sampling(sample collection,passive dosimeter) 0 Ionizing or Non-ionizing Radiation Testing 11<Other>
<br /> El Wipe/Bulk Sampling(to evaluate worker exposure) I C3 Noise Testing
<br /> Site-Specific Notes,Clarifications:
<br /> HSE Program Documents:HSE STD-135:Heating Protection Program HSE STD-140.-Radiation Safety Program HSESOP-230 Ionizing and Non-Ionizing Radiation Proteclion
<br /> HSE SOP409:Heat illness Prevention HSE SOP-410.Cold Stress Prevention HSE SOP-462.,Asbestos Exposure Control, HSE SOP464:Lead Exposure Con
<br /> HSE SOP466.Hydrogen Sufflde Exposure Control,HSE SOP468a:Respirable Crystalline Silica Exposure Control 1US-on10.,HSE SOP 470a Protection from Wildfire Smoke
<br /> Exposure
<br /> E.3. IFENCELINE/PERIMETER AIR MONITORING DApplicable 0 Not Applicable,Not Anticipated
<br /> 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
<br /> monitoring shall NOT be used as the sole basis for determining work zone atmospheric hazards.
<br /> Site-Specific Notes,Clarifications:
<br /> lroje,laisk Name:TR0712/Replacernent of Monitoring Wells THA ver.4.0
<br /> Geosyntecl;' THA Date:6/26/2025 Page 18
<br /> consultants
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