Proceedings - Teaching and Learning Centre - Simon Fraser ...

Fraser River Action Plan 3rd Research Workshop
Sampling Period
January, 1995 to December, 1995
Results Expected
1. The site is between 2 major traffic arteries (HWY 1 and HWY 7), so we expected
to see chemical composition similar to that for transportation sources.
2. A “finger print” of vehicle emissions will be compared to those at this site.
3. The topography and the meteorology of the area would indicate that the
prevailing winds would be primarily from the east, then the west and then from
other directions.
4. If the particulate is from transportation sources, than the expected particle size
would be < 2 µm.
Actual Results
1. Because we have just received the bulk of the data we have not been able to
evaluate most of the dry deposition data.
2. For the wet deposition, from partial data we see periods of short rainfall with
higher concentrations of PAHs that will need to be evaluated for ‘toxic
concentrations.’
3. Rainfall of longer duration is less concentrated because of dilution.
4. Particulate sizes have been generally < 2 m in size, and will be compared to
vehicle traffic data from in the Cassiar Tunnel.
5. Wet deposition sources appeared to be from easterly wind-bearing sources.
6. PAH deposition values appeared to be relatively consistent in their amounts
relative to each other.
7. A preliminary estimate of wet deposition of PAH to the area is about
1.9 μg /m 2 /day, or about 0.7 mg/ m 2 /year.
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