Report - Agence canadienne d'évaluation environnementale

Impacts on the inhabited area and human activities
♦ Finding — The Panel notes the measures planned by the proponent aimed at
reducing air contaminants that could be emitted on a temporary basis by the LNG
terminal construction site, including development of access to the construction site
via Lallemand Road.
Operation phase
Operation of the LNG terminal is likely to result in the emission of pollutants resulting
from the use of natural gas in the burners of the LNG vaporizers. There also could be
other less significant or intermittent emission sources such as diesel firewater pumps
and emergency generators, the flare stack and fugitive natural gas emissions. Adding
to this would be the occasional presence of an LNG tanker (one day out of six),
mainly at the time of its unloading, and of tugs needed for berthing or setting off. The
project’s expected air emissions are listed in Table 14.
Table 14 Expected air emissions from operation of the LNG terminal and
the jetty with LNG tankers and tugs
Sources Carbon
monoxi
de (CO)
Nitrogen
oxides((N
Ox)
Total
particulate
matter
(TPM)
Fine
particula
tes
(PM2,5)
Sulphur
dioxide
(SO2)
Volatile
organic
compounds
(VOCs)
LNG vaporizers (t/yr) 90 66 3.8 3.8 3.4 5.4
Flare (t/yr) 19.8 3.6 0 0 0.17 0
Fire pumps (t/yr) 0.15 0.69 0.05 0.04 0.01 0.05
Emergency generators (t/tr) 0.44 2.04 0.16 0.13 0.03 0.16
LNG tankers and tugs (t/yr) 21 106 2.7 2.1 63 2.7
Total (t/yr.) 131 179 6.6 6.1 67 8.3
Source: adapted from PR5.1, Appendix H, and Table H.6.
Table 15 shows modeled maximum concentrations of contaminants outside the
project’s property limits during jetty and land facility operation. On examining the
results in the table, the Panel notes that the anticipated addition of air emissions from
terminal operation would result in values well below RQA and PRAA standards,
except for the maximum sulphur dioxide content of 275 µg/m³. This value would come
close to the ambient air quality standard on an hourly basis set at 276 µg/m³ in the
PRAA. Such a situation could arise among Ville-Guay sector homes built on the cliff
along Highway 132, near the jetty.
190 Rabaska Project – Implementation of an LNG Terminal and Related Infrastructure