Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/25/2023 00:01 to 02/26/2023 11:52 Air Monitoring Instrument Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods 8533153603 PM2 5 (mg/m3) 0.035 mg/m3 No 0.027 to 0.028 0.0 PM10 (mg/m3) 0.035 mg/m3 Yes 0.038 to 0.041 0.0 8533183117 PM2 5 (mg/m3) 0.035 mg/m3 Yes 0.015 to 0.036 0.0 PM10 (mg/m3) 0.035 mg/m3 Yes 0.026 to 0.044 0.0 8533213306 PM2 5 (mg/m3) 0.035 mg/m3 No 0.007 to 0.020 0.0 PM10 (mg/m3) 0.035 mg/m3 No 0.008 to 0.022 0.0 W01A00000609 VOC (ppm) 0.5 ppm No 0.00 to 0.00 0.0 CO (ppm) 9 ppm No 0.00 to 0.19 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 W01A00000610 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 W01A00000611 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 W01A00000612 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 W01A00001706 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 W01A00001707 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 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 W01A00001709 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 W01A00001710 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 W01A00001712 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 See notes on last page. ------- Table 1 Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 02/25/2023 00:01 to 02/26/2023 11:52 Air Monitoring Instrument Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods W01A00001713 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 W01A00002175 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 W01A00002653 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 W01A00002654 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 W01A00002655 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 HCN (ppm) 1 ppm No 0.0 to 0.0 0.0 W01A00002656 VOC (ppm) 0.5 ppm No 0.00 to 0.04 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 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 0.00 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 W01A00002930 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 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. 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 H2S - Hydrogen Sulfide 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 S/N - Serial number VOC - Volatile organic compounds ------- x Gould Pond Failer St IJLE-Grant Ex> jrth Ave mmmm Park Ave E^Taggart S AliceSt lestine i/?/iajnst State Gamelands No 285 East Palestine i Cemetery ii-rtown Reference Map Location It TETRA TECH Prepared For: EPA Prepared By: TetraTech Inc. Legend E Continuous 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 Continuous Air Monitoring Stations Date Saved: 2/25/2023 ------- |