Report - Agence canadienne d'évaluation environnementale

Impacts on the inhabited area and human activities
♦ Finding — The Panel finds that the concentration of air contaminants expected in
inhabited areas during the two years that the LNG terminal will be under construction
will meet the standards of the Regulation respecting the Quality of Atmosphere and
the Draft Air Quality Regulation.
Table 13 Maximum concentrations of air contaminants calculated at the
most exposed residence during the two years of the LNG
terminal’s construction
Contaminant
Year 1 (2007) Year 2 (2008) Period Standard
µg/m 3 BL 1 Constr. 2 Total 3 BL 1 Constr. 2 Total 3 RQA PRAA
Carbon
monoxide (CO)
Sulphur dioxide
(SO2)
Nitrogen dioxide
(NO2)
Total particulate
matters (TPM)
Fine particulates
(PM2,5)
17,000 248 17,248 17,000 248 17,248 1 hr. 34,000 34,000
9 100 50 9 150 9 100 108 9 208 8 hr. 15 000 12 700
107 30 137 107 51 158 1 hr. 1,310 276 4
73 5 78 73 9 82 24 hr. 288 288
7.3 0.3 7.6 7.3 0.7 8 1 yr. 52 52
152 172 324 152 179 331 1 hr. 414 414
90 29 119 90 44 134 24 hr. 207 207
29 2.7 32 29 3 32 1 yr. 103 103
14 14 105 91 29 120 24 hr. 150 –
1 1 35 34 2.7 37 1 yr. 70 –
20 5 25 20 7 27 24 hr. – 30
1. Baseline: Maximum values in the ambient air at the Des Sables monitoring station for contaminants in gaseous
form (CO, SO2 and NO2) and at the De l’Eglise station for TPM from 2001 to 2003. For PM2.5, the baseline is that
specified by the MDDEP (PR5.1, QC-78 and Appendix H of the PRAA).
2. Construction.
3. Sum of maximum concentrations in the ambient air and of expected concentrations during construction based on
the assumption that they occur simultaneously.
4. 525 µg/m 3 over 4 minutes, i.e. the equivalent of 276 µg/m 3 on an hourly basis, applying the formula to this effect
contained in Appendix H of the PRAA.
Sources: adapted from PR5.2.1, QC-62s2 et QC-72s2, Tables 3 et 6; Regulation respecting the Quality of Atmosphere
and Draft Air Quality Regulation.
The Agences de la santé et des services sociaux de la Chaudière-Appalaches and de la
Capitale-Nationale believe that the risks of inhaling dust will be reduced by development of
the planned access road to the terminal from Lallemand Road, along with strict application
of the mitigation measures proposed by the proponent, including frequent applications of
dust suppressants and the use of low sulphur diesel fuel (0.05% wt) (DM602, p. 42).
Rabaska Project – Implementation of an LNG Terminal and Related Infrastructure 189