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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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Table 5.16. Frequency <str<strong>on</strong>g>of</str<strong>on</strong>g> exceedance <str<strong>on</strong>g>of</str<strong>on</strong>g> the selected toxicity threshold for surface water in adult upstream migrati<strong>on</strong> routes in the <strong>Fraser</strong> <strong>River</strong> Basin.C<strong>on</strong>taminant <str<strong>on</strong>g>of</str<strong>on</strong>g>C<strong>on</strong>cernAreas <str<strong>on</strong>g>of</str<strong>on</strong>g> InterestQuesnel <strong>River</strong> Nechako <strong>River</strong>Bowr<strong>on</strong> <strong>River</strong>Reference <strong>Fraser</strong> <strong>River</strong> BasinPre-1990 Post-1990 Pre-1990 Post-1990 Pre-1990 Post-1990 Pre-1990 Post-1990 Pre-1990 Post-1990C<strong>on</strong>venti<strong>on</strong>als (mg/L)Residue: N<strong>on</strong>filterable(TSS)NutrientsNitrogen - Nitrite,dissolved (NO 2 )0% (2) 59% (17) 0% (44) 7% (44) ND ND 0% (20) 0% (56) 35% (331) 28% (443)0% (5) ND 0% (31) 0% (74) ND ND ND 0% (57) 0% (303) 0% (427)Major I<strong>on</strong>sChloride, dissolved 0% (3) 0% (18) 0% (83) 0% (170) ND ND 0% (38) 0% (165) 0% (491) 0% (975)Sulfate, dissolved 0% (5) 0% (18) 0% (70) 0% (62) ND ND 0% (38) 0% (104) 0% (424) 0% (588)MetalsAluminum, total 0% (1) 62% (13) 68% (31) 73% (139) ND ND 100% (1) 84% (132) 83% (111) 83% (685)Arsenic, total ND 0% (17) 0% (42) 0% (139) ND ND 0% (37) 0% (82) 0% (171) 0% (505)Cadmium, total ND 0% (13) 35% (46) 0% (134) ND ND 3% (37) 0% (129) 17% (176) 8% (608)Chromium, total ND 31% (13) 73% (15) 15% (145) ND ND 67% (9) 8% (137) 86% (78) 51% (653)Cobalt, total ND 0% (18) 0% (7) 0% (145) ND ND 0% (9) 0% (137) 0% (28) 0% (723)Copper, total 0% (2) 6% (18) 45% (44) 0% (134) ND ND 38% (37) 1% (129) 40% (192) 13% (579)Ir<strong>on</strong>, total 0% (1) 22% (18) 36% (55) 54% (145) ND ND 16% (37) 6% (137) 61% (281) 62% (710)Lead, total 0% (2) 0% (13) 7% (44) 0% (134) ND ND 0% (37) 0% (129) 2% (193) 1% (566)Mercury, total ND 0% (8) 94% (31) 100% (7) ND ND 100% (11) 100% (17) 72% (142) 85% (54)Nickel, total ND 0% (18) 6% (17) 0% (134) ND ND 0% (9) 0% (129) 1% (71) 0% (613)Selenium, total ND 0% (16) 0% (42) 1% (133) ND ND 0% (37) 0% (82) 0% (164) 1% (439)Silver, total ND 0% (13) ND 4% (114) ND ND ND 2% (100) ND 3% (478)OtherPhenols ND ND 9% (11) 0% (7) ND ND ND ND 6% (53) 0% (7)ND = no data; TSS = total suspended solids.T-236

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