Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/11/2023 00:00 to 02/13/2023 14:00 Air Monitoring Instrument Analyte Screening Level Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods AreaRAE Pro S/N: W01A00000610 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.04 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001706 VOC (ppm) 0.5 ppm No 0.00 to 0.33 0.2 CO (ppm) 9 ppm No 0.00 to 0.09 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001707 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.10 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001708 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001709 VOC (ppm) 0.5 ppm No 0.00 to 0.02 0.01 CO (ppm) 9 ppm No 0.00 to 0.01 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001712 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.01 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001713 VOC (ppm) 0.5 ppm No 0.00 to 0.11 0.05 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.4 0.0 AreaRAE Pro S/N: W01A00002175 VOC (ppm) 0.5 ppm No 0.00 to 0.01 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002653 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002654 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.02 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002655 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.1 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 HCN (ppm) 1 ppm No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002656 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002928 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 HCN (ppm) 1 ppm No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00002930 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 HCN (ppm) 1 ppm No 0.0 to 0.0 0.0 AreaRAE Pro S/N: W01A00001710 VOC (ppm) 0.5 ppm No 0.00 to 0.21 0.05 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm No 0.0 to 0.0 0.0 LEL (%) >5% No 0.0 to 0.0 0.0 HCN (ppm) 1 ppm No 0.0 to 0.3 0.0 See notes on last page. ------- Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/11/2023 00:00 to 02/13/2023 14:00 Notes: Air monitoring measurements have been averaged over a 8-hour time period and summarized above. Start and stop times for each air monitoring instrument varies. The monitoring period is based on the earliest start time and latest stop time out of all units. Air monitoring is not performed during inclement weather conditions/rain and thunderstorms. Air monitoring for phosgene and hydrogen chloride was conducted while there was active fire at the derailment site, including prior to and during the controlled burn of vinyl chloride. As a precautionary measure, the monitoring of these parameters continued after the controlled burn was completed. Phosgene has not been detected via air monitoring since 2023-02-06 17:55 based on telemetry data. Hydrogen chloride has has not been detected via air monitoring since 2023-02- 08 08:05. Air monitoring for phosgene and hydrogen chloride has been discontinued. < - Less than > - Greater than % - Percent CO - Carbon Monoxide HCN - Hydrogen Cyanide H2S - Hydrogen Sulfide LEL - Lower Explosive Limit 02- Oxygen ppm - Parts per million S/N - Serial number VOC - Volatile organic compounds ------- 'GoMcf Ponct' Failer St i E Grant £ r_W;Grant St: W North Ave Martin St • E ? M a rt in St * - 3Efp|fk/Ave E^ Taggart St East Pa'lf stine East Palestine Cemetery' j own Windrow Plot ftjr (YNG1 YOUNGSTOWN v Obs Between: 10 Feb 2023 10:51 AM -13 Feb 2023 09:51 Al Summary Obs Used: 72 Obs Without Wind. 4 Avg Speed: 6.2 mph I I / / A / State / Gamelands No Reference Map Location Legend E Continuous Air Monitoring Location Derailment Location One Mile Radius Miles East Palestine Derailment ER Site 75 E Main St East Palestine, Columbiana County, OH 44413 Figure 1 Continuous Air Monitoring Stations It TETRA TECH Prepared For: EPA Prepared By: Tetra Tech Inc. Date Saved: 2/12/2023 ------- |