DRAFT Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/10/2023 09:56 to 02/11/2023 15:40 Air Monitoring Instrument Analyte Screening Level Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods AreaRAE Pro S/N: W01A00000609 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: W01A00000610 VOC (ppm) 0.5 ppm No 0.00 to 0.06 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: W01A00001706 VOC (ppm) 0.5 ppm No 0.00 to 0.43 0.3 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: 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 0.01 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: W01A00001712 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: W01A00001713 VOC (ppm) 0.5 ppm No 0.16 to 0.21 0.19 CO (ppm) 9 ppm No 0.00 to 0.00 0.0 H2S (ppm) 0.1 ppm Yes* 0.0 to 0.5 0.2 LEL (%) >5% No 0.0 to 0.0 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 0.00 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: W01A00002656 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 0.1 0.0 HCN (ppm) 1 ppm 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 AreaRAE Pro S/N: W01A00002929 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.00 See notes on last page. ------- DRAFT Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/10/2023 09:56 to 02/11/2023 15:40 Notes: * A secondary instrument was used to evaluate H2S and reported H2S as non-detected. The elevated H2S measurements are likely attributable to sensor drift. The H2S sensor was recalibrated. 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. < - 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 ------- Little f "h °ute.., Old'Eno Darlington Twp Jimtown State Gameiands No 285 Cannsltnn Site Location TETRA TECH Reference Map Legend H Continuous Air Monitoring Location Derailment Location One Mile Radius Prepared For: EPA Prepared By: Tetra Tech Inc. East Palestine Derailment ER Site 75 E Main St East Palestine, Columbiana County, OH 44413 Figure 1 Continuous Air Monitoring Stations Date Saved: 2/11/2023 ------- |