We are in the process of ensuring this document is accessible to all audiences. If you need assistance accessing this document, or any material on the EPA East Palestine, Ohio emergency response web pages, please contact the Region 5 Public Information Officer on-call at: R5_EastPalestine@epa.gov Table 1 Work Area Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 05/29/2023 00:00 through 05/30/2023 10:21 Air Monitoring Instrument: Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods 8533230604 PM2 5 (mg/m3) 0.035 (mg/m3) Yes2 0.017 to 0.038 0.027 PM10 (mg/m3) 0.070 (mg/m3) No 0.029 to 0.044 0.037 8533153004 PM2 5 (mg/m3) 0.035 (mg/m3) No 0.005 to 0.011 0.007 PM10 (mg/m3) 0.070 (mg/m3) No 0.009 to 0.014 0.011 8533213308 PM2 5 (mg/m3) 0.035 (mg/m3) No 0.020 to 0.031 0.024 PM10 (mg/m3) 0.070 (mg/m3) No 0.026 to 0.040 0.031 8533230602 PM2 5 (mg/m3) 0.035 (mg/m3) Yes2 0.024 to 0.038 0.030 PM10 (mg/m3) 0.070 (mg/m3) No 0.039 to 0.057 0.047 8533183902 PM2 5 (mg/m3) 0.035 (mg/m3) No 0.003 to 0.007 0.006 PM10 (mg/m3) 0.070 (mg/m3) No 0.003 to 0.008 0.006 W01A00000610 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 LEL (%) >5% No 1.93 to 1.93 1.93 W01A00000611 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 LEL (%) >5% No 0.00 to 0.00 0.00 W01A00002176 VOC (ppm) 0.5 (ppm) No 0.00 to 0.01 0.00 W01A00002178 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 W01A00002184 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 W01B00002178 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 LEL (%) >5% No 0.00 to 0.65 0.04 W01B00002207 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 LEL (%) >5% No 0.00 to 0.00 0.00 Notes: 1 Site-Specific Screening Levels stated in the Tetra Tech Air Monitoring and Sampling Plan. Screening levels were modified on March 16, 2023 to reflect updated operation procedures on when to apply mitigation methods to reduce dust. Action levels set by health departments have not changed. " Vehicle traffic observed during monitoring period near monitoring instrument. 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. Abbreviations: > - Greater than % - Percent LEL - Lower Explosive Limit mg/m - milligrams per meter cubed PM2 5 - Particulate Matter, diameter 2.5 micrometers and smaller PMio - Particulate Matter, diameter 10 micrometers and smaller ppm - Parts per million S/N - Serial number VOC - Volatile organic compound We are in the process of ensuring this document is accessible to all audiences. If you need assistance accessing this document, or any materials on the EPA East Palestine, Ohio emergency response webpages, please contact the Region 5 Public Information Officer on- ------- W01AQ0002173 8533153*004 Summary Obs Used; 34 Without Wind: 1 Speed: 7.0 mph Reference Map Location Legend 0 Continuous Air Monitoring Locations with DustTrak [¦"] Continuous Air Monitoring Locations Derailment Location One Mile Radius East Palestine Derailment ER Site East Palestine, Columbiana County, OH 44413 Figure 1 Continuous Air Monitoring Work Area Stations TETRA TECH Prepared For: EPA Prepared By: TetraTech Inc. Date Saved: 5/31/2023 ------- |