Table 1 Work Area Continuous Air Monitoring Results East Palestine Derailment Site East Palestine, Columbiana County, Ohio Monitoring Period: 04/14/2023 00:00 through 04/15/2023 09:10 Air Monitoring Instrument: Serial Number Analyte Screening Level1 Screening Level Exceeded? 8-hour Period Concentration Range Average of All 8-hour Periods 8533153005 PM2 5 (mg/m3) 0.035 (mg/m3) Yes"' 0.028 to 0.049 0.038 PM|:| (mg/m3) 0.070 (mg/mJ) No 0.032 to 0.065 0.048 8533183902 PM2 5 (mg/m3) 0.035 (mg/m3) Yes"' 0.014 to 0.053 0.036 PM|U (mg/m1) 0.070 (mg/mJ) No 0.015 to 0.067 0.042 8533213308 PM2 5 (mg/m3) 0.035 (mg/m3) Yes"1 0.008 to 0.037 0.024 PM|:| (mg/m3) 0.070 (mg/mJ) No 0.011 to 0.058 0.039 8533230602 PM2 5 (mg/m3) 0.035 (mg/m3) Yes' 0.012 to 0.055 0.039 PM10(mg/m3) 0.070 (mg/m3) Yes' 0.018 to 0.113 0.072 8533230604 PM2 5 (mg/m3) 0.035 (mg/m3) Yes' 0.010 to 0.035 0.025 PM|:| (mg/m3) 0.070 (mg/mJ) No 0.012 to 0.053 0.035 8533230702 PM2 5 (mg/m3) 0.035 (mg/m3) No 0.014 to 0.024 0.019 PM|:| (mg/m3) 0.070 (mg/mJ) No 0.015 to 0.025 0.020 W01A00000610 VOC (ppm) 0.5 (ppm) No 0.00 to 0.02 0.00 LEL (%) >5% No 0.00 to 0.00 0.00 W01A00000612 VOC (ppm) 0.5 (ppm) No 0.00 to 0.11 0.04 LEL (%) >5% No 0.00 to 0.00 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 LEL (%) >5% 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 0.00 0.00 W01B00002207 VOC (ppm) 0.5 (ppm) No 0.00 to 0.00 0.00 LEL (%) >5% No 0.00 to 0.00 0.00 W01B00002209 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. 2 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/m3 - milligrams per meter cubed PM2 5 - Particulate Matter, diameter 2.5 micrometers and smaller PM10 - 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-call r5_eastpalestine@epa.gov ------- VV01B00002207 85332306Cfo*W|i mTSSm I iV - fV^ *~W01A00000612 ^ —j». . wi n^MRH _ , .^g*g8533.183902 i , W01A00002178 S533153iDQ5# P I W01A00000610 8533230602 W01A00Q02184 W01B00002178 Plot for [YNG1 YOUNG5TOWN Summary Obs Used; 33 Obs Without Wind: 1 Avg Speed: 6.4 rnph Generated: 17 Apr 2023' Reference Map Legend 0 Continuous Air Monitoring Locations with DustTrak [¦"] Continuous Air Monitoring Locations h 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: 4/15/2023 ------- |