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

Fraser River Action Plan 3rd Research Workshop
Sediment Guidelines
Probable Effects Level (PEL) = level above which adverse effects are
predicted to occur frequently
Threshold Effects Level (TEL) = concentration below which adverse
effects are expected to occur rarely
Between PEL and TEL, the levels are occasionally expected to be
associated with adverse biological effects.
CONCLUSIONS
1) Some point-source pollution is still affecting water quality conditions
in our urban streams
2)
3)
4)
5)
6)
7)
Stormwater runoff can contain high levels of contaminants (metals &
hydrocarbons)
Many stormwater contaminants are associated with particles
Levels of contaminants that enter the waterways are related to the
impervious land areas and vehicle numbers
Source control works (Pb, chlorinated HC)
Management strategies to remove suspended solids in stormwater
will help to control contaminants in urban streams
Contaminants from stormwater runoff are affecting aquatic life in
urban streams
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