Table 1 Roving Air Monitoring Results Summary Table East Palestine Derailment Emergency Response East Palestine, Ohio Monitoring Period: 03/01/2023 09:10 to 03/01/2023 11:04 Location Date/Time LEL (%) CO (ppm) H2S (ppm) VOC (ppm) PM2 5 (mg/m3)1 PM10 (mg/m3)1 HCN (ppm)* Screening Levels 5% 9 ppm 0.1 ppm 0.5 ppm 0.035 mg/m3 0.035 mg/m3 1 ppm PCR-N-03 03/01/2023 09:28 0 0 0 0 0.014 0.015 0 PCR-N-04 03/01/2023 10:40 0 0 0 0 0.004 0.005 0 PCR-N-05 03/01/2023 10:51 0 0 0 0 0.005 0.009 0 PCR-N-06 03/01/2023 10:29 0 0 0 0 0.003 0.004 0 PCR-N-07 03/01/2023 09:37 0 0 0 0 0.01 0.014 0 PCR-N-08 03/01/2023 10:03 0 0 0 0 0.007 0.009 0 PCR-N-09 03/01/2023 10:11 0 0 0 0 0.005 0.006 0 PCR-N-10 03/01/2023 10:18 0 0 0 0 0.005 0.006 0 PCR-N-11 03/01/2023 10:57 0 0 0 0 0.003 0.004 0 PCR-N-12 03/01/2023 11:04 0 0 0 0 0.003 0.004 0 PCR-N-13 03/01/2023 10:36 0 0 0 0 0.007 0.01 0 PCR-S-10 03/01/2023 09:10 0 0 0 0 0.012 0.011 0 Notes: Highlighted indicate detections above screening levels Grey cells indicate no measurement was collected for that specific parameter 1 - Site-Specific Public Health Screening Levels for particulate matter are based on 24-hour time-weighted averages (TWAs). Fixed discrete monitoring readings are discrete readings, and so do not represent conditions over a full 24-hour period. * - the screening level is the instrument's limit of detection. % - percent CO - carbon monoxide H2S - hydrogen sulfide HCN - hydrogen cyanide LEL - lower explosive limit mg/nf - milligrams per cubic meter 02 - oxygen PM2 5 - particles that are 2.5 micrometers and smaller PM10 - particles that are 10 micrometers and smaller ppm - parts per million TWA - time-weighted average VOC - volatile organic compounds ------- x Gould . MS§md VcCtufe Ave 'artin S' - East Palestine East Palestine Cemetery Jimtown Legend O Roaming Air Monitoring Locations A Derailment Location One Mile Radius East Palestine Derailment ER Site 75 E Main St East Palestine, Columbiana County, OH 44413 Figure 1 Roaming Air Monitoring Locations TETRA TECH Prepared For: EPA Prepared By: TetraTech Inc. Reference Map Location Date Saved: 3/2/2023 ------- |