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Potential Effects of Contaminants on Fraser River Sockeye Salmon

Potential Effects of Contaminants on Fraser River Sockeye Salmon

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3.1.2.4 Run<str<strong>on</strong>g>of</str<strong>on</strong>g>f from Linear DevelopmentsLinear developments in the <strong>Fraser</strong> <strong>River</strong> Basin include road networks, rail networks,electrical transmissi<strong>on</strong> lines, and seismic lines used in oil and gas development (Figure3.20). The road network in the study area c<strong>on</strong>sists <str<strong>on</strong>g>of</str<strong>on</strong>g> public highways and roads that arec<strong>on</strong>structed and maintained by provincial and municipal governments and a substantialnumber <str<strong>on</strong>g>of</str<strong>on</strong>g> industrial roads that are used in forest management, mining development, andother industrial activities. The rail network is also well developed within the study area,with the major operators including VIA Rail Canada, Canadian Pacific Railroad, and CN.Releases <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>taminants to aquatic ecosystems can occur during the c<strong>on</strong>structi<strong>on</strong>,maintenance, or decommissi<strong>on</strong>ing <str<strong>on</strong>g>of</str<strong>on</strong>g> linear developments. Spills <str<strong>on</strong>g>of</str<strong>on</strong>g> hazardous substancesduring transport can also result in c<strong>on</strong>taminati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> receiving water systems. Thesubstances <str<strong>on</strong>g>of</str<strong>on</strong>g> greatest c<strong>on</strong>cern relative to linear developments include:• C<strong>on</strong>venti<strong>on</strong>al variables (TSS);• Major i<strong>on</strong>s (e.g., chloride, as a result <str<strong>on</strong>g>of</str<strong>on</strong>g> road salt applicati<strong>on</strong>s);• Nutrients (e.g., nitrates, nitrite, and amm<strong>on</strong>ia, which are associated withblasting);• Metals (arsenic, cadmium, copper, chromium, lead, mercury, nickel, zinc,which may be released during combusti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> fossil fuels);• Polycyclic aromatic hydrocarb<strong>on</strong>s;• Petroleum hydrocarb<strong>on</strong>s (e.g., oil and grease, diesel-range organics, alkanes);and,• In-use herbicides (glyphosate, triclopyr, picloram, and 2,4-D, which may beused to maintain rights-<str<strong>on</strong>g>of</str<strong>on</strong>g>-way).3.1.3 Atmospheric SourcesTransport in the atmosphere can represent an important process for distributingc<strong>on</strong>taminants originating within the watershed, elsewhere in North America, andworldwide. Accordingly, potential atmospheric sources <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>taminants to the <strong>Fraser</strong><strong>River</strong> Basin are described in the following secti<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> the report.3.1.3.1 Natural Sources <str<strong>on</strong>g>of</str<strong>on</strong>g> Atmospheric PollutantsPoint source discharges and n<strong>on</strong>-point source releases associated with anthropogenicactivities represent the primary sources <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>taminants in the <strong>Fraser</strong> <strong>River</strong> Basin.40

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