Background:
The fire at the Intercontinental Terminals Company (ITC, Deer Park,
La Porte, TX, USA) from March 17-20, 2019 resulted in substantial releases
of chemical contaminants to the environment, including the surface waters of
the Houston Ship Channel.
Objective:
To characterize spatial and temporal trends, as well as potential
human health risks, from these releases.
Methods:
Out of 433 substances with available data, seven were selected for
analysis: benzene, toluene, ethylbenzene, xylenes, oil & grease,
suspended solids, and total petroleum hydrocarbons. Spatial and temporal
concentration trends were characterized, and hazard quotients and cancer
risks were calculated to estimate the potential for human health impacts
from these contaminants.
Results:
Temporal analysis showed presence of these chemical contaminants in
water immediately after the event; their concentrations dissipated
substantially within 4 weeks. The spatial distribution of contaminants
indicated the highest concentrations in the waterways within about 1km of
the ITC. The greatest potential human health risks stemmed from presence of
benzene.
Significance:
A short-term but substantial spike in the concentrations of a number
of hazardous contaminants occurred near the incident, with concentrations
returning to apparent baseline levels within one month likely due to a
combination of volatization, dilution and degradation.