Table 1

Continuous Air Monitoring Results
East Palestine Derailment Site
East Palestine, Columbiana County, Ohio

Monitoring Period: 02/11/2023 00:00 to 02/13/2023 14:00

Air Monitoring
Instrument

Analyte

Screening Level

Screening Level
Exceeded?

8-hour Period
Concentration Range

Average of All
8-hour Periods

AreaRAE Pro
S/N: W01A00000610

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

AreaRAE Pro
S/N: W01A00001706

VOC (ppm)

0.5 ppm

No

0.00 to 0.33

0.2

CO (ppm)

9 ppm

No

0.00 to 0.09

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

AreaRAE Pro
S/N: W01A00001707

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.0

CO (ppm)

9 ppm

No

0.00 to 0.10

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

AreaRAE Pro
S/N: 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

AreaRAE Pro
S/N: W01A00001709

VOC (ppm)

0.5 ppm

No

0.00 to 0.02

0.01

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

AreaRAE Pro
S/N: W01A00001712

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00001713

VOC (ppm)

0.5 ppm

No

0.00 to 0.11

0.05

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 0.4

0.0

AreaRAE Pro
S/N: W01A00002175

VOC (ppm)

0.5 ppm

No

0.00 to 0.01

0.00

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

AreaRAE Pro
S/N: W01A00002653

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00002654

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00002655

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

CO (ppm)

9 ppm

No

0.00 to 0.00

0.0

H2S (ppm)

0.1 ppm

No

0.0 to 0.1

0.0

LEL (%)

>5%

No

0.0 to 0.0

0.0

HCN (ppm)

1 ppm

No

0.0 to 0.0

0.0

AreaRAE Pro
S/N: W01A00002656

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00002928

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00002930

VOC (ppm)

0.5 ppm

No

0.00 to 0.00

0.00

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

AreaRAE Pro
S/N: W01A00001710

VOC (ppm)

0.5 ppm

No

0.00 to 0.21

0.05

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 0.3

0.0

See notes on last page.


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Table 1

Continuous Air Monitoring Results
East Palestine Derailment Site
East Palestine, Columbiana County, Ohio

Monitoring Period: 02/11/2023 00:00 to 02/13/2023 14:00

Notes:

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.

Air monitoring for phosgene and hydrogen chloride was conducted while there was active fire at the derailment site, including prior to and during the controlled
burn of vinyl chloride. As a precautionary measure, the monitoring of these parameters continued after the controlled burn was completed. Phosgene has not
been detected via air monitoring since 2023-02-06 17:55 based on telemetry data. Hydrogen chloride has has not been detected via air monitoring since 2023-02-
08 08:05. Air monitoring for phosgene and hydrogen chloride has been discontinued.

< - Less than
> - Greater than
% - Percent

CO - Carbon Monoxide

HCN - Hydrogen Cyanide

H2S - Hydrogen Sulfide

LEL - Lower Explosive Limit

02- Oxygen

ppm - Parts per million

S/N - Serial number

VOC - Volatile organic compounds


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Summary
Obs Used: 72
Obs Without Wind. 4
Avg Speed: 6.2 mph

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/

/	A

/ State

/ Gamelands No

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: 2/12/2023


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