BAYPORT CHANNEL COLLISION
UNIFIED COMMAND
Preliminary Air Monitoring Summary
La Porte, TX
May 10, 2019
Project #111608

 1.0

Introduction

On May 10, 2019, the Bayport Channel Collision Unified Command requested that CTEH® conduct air
monitoring after a barge collision in La Porte, Texas. CTEH® arrived on-site on May 10, 2019 and began air
monitoring operations. CTEH® is currently conducting air monitoring in the surrounding community areas.
The present summary discusses real-time air monitoring data collected within community areas from May
10, 2019 17:37 to May 11, 2019 00:00. During this reporting period, CTEH® performed real-time air
monitoring in community areas west of the incident site including Seabrook, La Porte, El Lago, Pasadena,
Clear Lake Shores, League City, Texas City, and Bacliff.

2.0

Air Monitoring Methods

CTEH® developed and implemented a preliminary Community Air Sampling and Analysis Plan (SAP) to
document and quantify the release of fugitive emissions, if any, from the incident. All instrumentation
was calibrated at least once per day or per manufacturer’s recommendations. Target analytes were
measured as listed in Table 1, below. Roaming air monitoring was performed in community areas with
hand-held instruments. All hand-held air monitoring was conducted in the breathing zone.

3.0

Air Monitoring Results

Attachment A provides maps of hand-held air monitoring locations in the community during this reporting
period. Table 1 summarizes the results for community hand-held air monitoring.
Table 1: Community Hand-Held Real-Time Air Monitoring Results
# of Readings

# of Detections

Detection Range1

3

0

<0.05 ppm

UltraRAE

136

0

<0.025 ppm

%LEL

MultiRAE

99

0

<1 %

Toluene

Gastec #122L

1

0

<0.5 ppm

VOCs

MultiRAE

261

30

0.1 - 11.6 ppm

Xylene

Gastec Tube #123L

8

0

<1 ppm

Analyte
Benzene

Instrument
Gastec #121L

1

Maximum detections preceded by the “<” symbol are considered non-detections below the limit of detection (LoD) value to the right.

Between May 10, 2019 17:37 to May 11, 2019 00:00, CTEH® performed air monitoring for benzene, %LEL,
toluene, VOCs, and xylene. During this reporting period, CTEH® personnel observed 30 detectable
concentrations of VOCs in the community, ranging from 0.1 – 11.6 ppm. Following detections of VOCs,
benzene readings were taken at those locations to determine if further action was required. In total,

Page   1

 CTEH® personnel observed no detectable concentrations of benzene, %LEL, toluene, and xylene in the
community during this reporting period.

4.0

Weather Conditions

Attachment B contains a wind rose depicting wind speed and direction for this reporting period. Data
was acquired from the Texas Commission on Environmental Quality (TCEQ) Seabrook Friendship Park
meteorological station located on Park Drive approximately 4 miles west of the incident site.

Page   2

 Attachment A

 

CTEH Community Air Monitoring

Locations

 

Page 1 .
CTEH
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Bayport Channel Collision

 

City: La Porte, TX
County: Har'is

 

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Community Ha nd?Held Real?Time Monitoring Locations May 11, 2019 00:00 to May 11, 2019 05:00 

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Incident Location
Real-Time Reading

 

Last Updated: 4:43:19 AM

 

 

Document Nen?e 

 

Projection System: Transverse Mercator Datum: WGS 1984 UTM zone on

Coordinates are Approxim ate

Attachment 

 

Meteorological Conditions

 

Page A-2 
CTEH
IE- SKIS-NICE 

ri-

WIND ROSE PLOT:

DISPLAY:

Station #Seabrook Friendship Park

Wind Speed
Direction (blowing from)

NORTH

43.8%
35%
26.3%
17.5%
8.75%
WEST

EAST

WIND SPEED
(mph)
>= 20.99
17.00 - 20.99
11.00 - 17.00
7.00 - 11.00

SOUTH

4.00 - 7.00
0.99 - 4.00
Calms: 0.00%

COMMENTS:

DATA PERIOD:

COMPANY NAME:

Start Date: 5/10/2019 - 17:00
End Date: 5/10/2019 - 23:00
MODELER:

WRPLOT View - Lakes Environmental Software

CALM WINDS:

TOTAL COUNT:

0.00%

7 hrs.

AVG. WIND SPEED:

DATE:

2.71 mph

5/11/2019

PROJECT NO.:

111608