Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/20/2023 02:16 to 02/21/2023 01:09 Air Monitoring Instrument: AreaRAE Pro Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods W01A00000610 VUt (ppm) 0.5 ppm No 0.00 to 0.08 0.1 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00001706 VOC (ppm) 0.5 ppm No 0.00 to 0.03 0.0 CO (ppm) 9 ppm No 0.00 to 0.03 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 W01A00001707 vut (.ppm; 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00001708 vut (ppm) 0.5 ppm No 0.00 to 0.05 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00001709 vut (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00001710 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.04 to 0.14 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 W01A00001712 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 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 W01A00001713 VOC (ppm) 0.5 ppm No 0.00 to 0.07 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 W01A00002175 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00002653 VOC (ppm) 0.5 ppm No 0.00 to 0.01 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 W01A00002654 vut (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00002655 vut (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 ------- Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/20/2023 02:16 to 02/21/2023 01:09 Air Monitoring Instrument: AreaRAE Pro Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods W01A00002656 vut (.ppm; 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.1 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 W01A00002928 vut (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 W01A00002930 vut (.ppm; 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.0 to 0.0 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 Notes: 1 Site-Specific Action Level stated in the Tetra Tech Air Monitoring and Sampling Plan. Air monitoring measurements have been averaged over a 8-hour time period and summarized above. Air monitoring is not performed during inclement weather conditions/rain and thunderstorms. < - Less than > - Greater than % - Percent CO - Carbon Monoxide H2S - Hydrogen Sulfide HCN - Hydrogen Cyanide LEL - Lower Explosive Limit 02 - Oxygen ppm - Parts per million S/N - Serial number VOC - Volatile organic compounds ------- i Gom PonTii Failer St W, Grant St W North Avi1 W Martin St W Clark St State Line , lLake Park Ave E Taggart St State Gamelands No 285 East Palestine „ s < t - Cemetery' Jimtown Windrow Plot for [VN61 YOUNGSTOWN Obs Between: 20 Feb 2023 02:51 AM -, Figure 1 Continuous Air Monitoring Stations TETRA TECH Prepared For: EPA Prepared By: Tetra Tech Inc. Summary Obs Used: 23 Obs Without Wind: 0 Avg Speed: 6-7 mph 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 Date Saved: 2/20/2023 ------- |