Table 1 Roving Air Monitoring Results Summary Table East Palestine Derailment Emergency Response East Palestine, Ohio Monitoring Period: 02/08/2023 20:44 to 02/09/2023 04:33 Location Date/Time o2 (%) LEL (%) CO (ppm) H2S (ppm) VOC (ppm) PM2.5 (rng/m3) PM10 (mg/m3) HCN (ppm)* Benzene (ppm) Phosgene (ppm) HC1 (ppm) Screening Levels 19.5% to 23.5% 5% 9 ppm 0.1 ppm 0.5 ppm 0.035 mg/m3 0.035 mg/m3 1 (ppm) 0.01 (ppm) 0.002 (ppm) 1.4 (ppm) PCR-N-01 2/9/2023 0:10 20.9 0 0 0 0 0.043 0.045 0 0 0 0 PCR-N-02 2/9/2023 0:01 20.9 0 0 0 0 0.035 0.036 0 0 0 0 PCR-N-03 2/8/2023 23:53 20.9 0 0 0 0 0.04 0.041 0 0 0 0 PCR-N-04 2/8/2023 23:50 20.9 0 0 0 0 0.038 0.038 0 0 0 0 PCR-N-05 2/8/2023 23:24 0 0 0 0 0.004 0.035 0 0 0 0 PCR-N-06 2/8/2023 23:13 20.9 0 0 0 0.028 0.029 0 0 0 0 PCR-N-07 2/8/2023 23:05 20.9 0 0 0 0 0.038 0.045 0 0 0 0 PCR-N-08 2/8/2023 22:56 20.9 0 0 0 0 0.038 0.039 0 0 0 0 PCR-N-09 2/8/2023 21:53 20.9 0 501 0 0 0.019 0.022 0 0 0 0 PCR-N-10 2/8/2023 21:40 20.9 0 0 0 0 0.027 0.028 0 0 0 0 PCR-N-11 2/8/2023 21:29 20.9 0 0 0 0 0.029 0.032 0 0 0 0 PCR-N-12 2/8/2023 21:16 20.9 0 0 0 0 0.031 0.04 0 0 0 0 PCR-N-13 2/8/2023 20:44 20.9 0 0 0 0 0.028 0.035 0 0 0 0 PCR-S-01B 2/9/2023 1:06 20.9 0 0 0 0.07 0.053 0.053 0 0 0 0 PCR-S-01A 2/9/2023 3:02 20.9 0 0 0 0 0.036 0.037 0 0 0 0 PCR-S-02 2/9/2023 1:38 20.9 2/9/2023 3:18 20.9 0 0 0 0 0.038 0.039 0 0 0 0 PCR-S-03 2/9/2023 3:25 20.9 0 0 0 0 0.035 0.036 0 0 0 0 PCR-S-04 2/9/2023 3:33 20.9 0 0 0 0.035 0.036 0 0 0 0 PCR-S-05 2/9/2023 3:41 20.9 0 0 0 0 0.031 0.031 0 0 0 0 PCR-S-06 2/9/2023 3:47 20.9 0 0 0 0 0.03 0.03 0 0 0 0 PCR-S-07 2/9/2023 3:55 20.9 0 0 0 0 0.025 0.025 0 0 0 0 PCR-S-08 2/9/2023 4:05 20.9 0 0 0 0.01 0.024 0.029 0 0 0 0 PCR-S-09 2/9/2023 4:16 20.9 0 0 0 0.01 0.023 0.025 0 0 0 0 PCR-S-10 2/9/2023 4:33 20.9 0 0 0 0.01 0.022 0.022 0 0 0 0 Notes: Highlighted indicate detections above screening levels Grey cells indicate no measurement was collected for that specific parameter * - the screening level is the instrument's limit of detection. 1 - A secondary instrument was used to evaluate CO and reported CO as non-detected. The elevated CO measurements are likely attributable to sensor drift. The primary monitoring instrument was replaced. % - percent CO - carbon monoxide H2S - hydrogen sulfide HC1 - hydrogen chloride HCN - hydrogen cyanide LEL - lower explosive limit mg/m3 - 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 VOC - volatile organic compounds ------- r E Taaaa^t St ast Pales&in Jimtown Reference Map Site Location It Figure 1 Roaming Air Monitoring Locations Legend ^ Derailment Location One Mile Radius O Roaming Air Monitoring Locations East Palestine Derailment ER Site 75 E Main St East Palestine, Columbiana County, OH 44413 TETRA TECH Prepared By: Tetra Tech Inc. Miles Prepared For: EPA Date Saved: 2/8/2023 ------- |