Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/13/2023 00:01 to 02/15/2023 05:39 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 VUC (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 W01A00001706 VOC (ppm) 0.5 ppm No 0.00 to 0.30 0.1 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 W01A00001707 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 W01A00001708 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 W01A00001709 VOC (ppm) 0.5 ppm No 0.00 to 0.02 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 0.07 0.0 CO (ppm) 9 ppm No 0.00 to 0.13 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 0.06 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 0.11 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 0.00 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 W01A00002653 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.22 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 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 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 W01A00002655 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.05 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 0.00 to 0.05 0.0 See notes on last page. ------- Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/13/2023 00:01 to 02/15/2023 05:39 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 VOC (ppm) 0.5 ppm No 0.00 to 0.00 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 HCN (ppm) 1 ppm No 0.0 to 0.0 0.0 W01A00002928 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 W01A00002930 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 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 Poncfi L/ Je Grant -i\ W Grant St W North Av? W Martin St Park Ave E Taggart St < 33 stine State Gamelands No 285 East Palestine ^ ¦ Cemetery' <1? Jimtown Wtncltow Plot ftjr tVNO] YOUNGSTOWN ;i v Obs Between: li Feb 2023 12:51 AM -15 Feb 2023 06:51 Al Summary Obs Used: 55 Obs Without Wind: 0 Avg Speed: 8.9 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 Figure 1 Continuous Air Monitoring Stations It TETRA TECH Prepared For: EPA Prepared By: Tetra Tech Inc. Date Saved: 2/14/2023 ------- |