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UBC Theses and Dissertations
Trace metals in urban stormwater runoff and their management Li, Tong
Abstract
In the Greater Vancouver Regional District (GVRD), non-point source pollution from an urban watershed and a diesel bus loop was assessed in terms of trace metal contamination in the stormwater runoff. In the Brunette River watershed study, Northwest Hydraulic Consultants (NHC) collected streambed sediment and suspended sediment from selected streams during 7 storm events over 2003. From 1993 to 2003, the major stormwater contamination happened in the most industrialized Still Creek. The streambed Cu, Mn, Fe, and Zn concentration increased by 1.5, 1.7, 1.9, and 1.1 times, respectively. And the suspended Cu, Mn, and Zn increased by a factor of 2.1, 4.2, and 1.5, respectively. The streambed sediment exceeded probable effect level in Still Creek and Stoney Creek to varying degrees with Cu and Zn. The land use is considered to be the origins of these toxicants. Statistically, the magnitude of suspended metal concentration in μg/l is negatively correlated with the drainage areas. While the — concentrations in mg/kg, especially for metal Cu and Zn, showed strongly and positively correlation with the traffic density. Positive correlation existed between the suspended metal loading (kg/yr) and the imperviousness and the catchment area. No apparent trend was observed in terms of export coefficient (g/ha/yr) and land use. 1062 tons of sediments were trapped by Burnaby Lake in 2003. This sediment overloading problem causes serious metal contamination in the lake. Stormwater runoff quality was monitored in 15 storm events from October 2004 to June 2005 in the diesel bus loop in the University of British Columbia. The dissolved Cu and Zn Event Mean Concentration (EMC) exceeded the EPA discharge criteria in 2 and 4 events each, which occurred in the dry season. Diesel bus traffic contributes' a large portion of Cu, Fe, Zn contamination since the average bus loop trace metal levels were much higher than the GVRD urban levels. The runoff trace metal concentrations are strongly related to the antecedent dry period, and are weakly related to the traffic density and the rainfall intensity. From the catch basin filter evaluation, high removal efficiencies on suspended metal/solids were achieved with low particulate loading in the filter chamber. The filter performed well for the dissolved metal removal before the non-reversible saturation was reached. Each kilogram of filter media has an absorption capacity of 52 gram oil and grease, 20 milligram Mn, and 16 milligram Zn.
Item Metadata
Title |
Trace metals in urban stormwater runoff and their management
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2007
|
Description |
In the Greater Vancouver Regional District (GVRD), non-point source pollution from an urban
watershed and a diesel bus loop was assessed in terms of trace metal contamination in the stormwater
runoff.
In the Brunette River watershed study, Northwest Hydraulic Consultants (NHC) collected streambed
sediment and suspended sediment from selected streams during 7 storm events over 2003. From 1993 to
2003, the major stormwater contamination happened in the most industrialized Still Creek. The
streambed Cu, Mn, Fe, and Zn concentration increased by 1.5, 1.7, 1.9, and 1.1 times, respectively. And
the suspended Cu, Mn, and Zn increased by a factor of 2.1, 4.2, and 1.5, respectively. The streambed
sediment exceeded probable effect level in Still Creek and Stoney Creek to varying degrees with Cu and
Zn. The land use is considered to be the origins of these toxicants. Statistically, the magnitude of
suspended metal concentration in μg/l is negatively correlated with the drainage areas. While the —
concentrations in mg/kg, especially for metal Cu and Zn, showed strongly and positively correlation with
the traffic density. Positive correlation existed between the suspended metal loading (kg/yr) and the
imperviousness and the catchment area. No apparent trend was observed in terms of export coefficient
(g/ha/yr) and land use. 1062 tons of sediments were trapped by Burnaby Lake in 2003. This sediment
overloading problem causes serious metal contamination in the lake.
Stormwater runoff quality was monitored in 15 storm events from October 2004 to June 2005 in the
diesel bus loop in the University of British Columbia. The dissolved Cu and Zn Event Mean
Concentration (EMC) exceeded the EPA discharge criteria in 2 and 4 events each, which occurred in the
dry season. Diesel bus traffic contributes' a large portion of Cu, Fe, Zn contamination since the average
bus loop trace metal levels were much higher than the GVRD urban levels. The runoff trace metal
concentrations are strongly related to the antecedent dry period, and are weakly related to the traffic
density and the rainfall intensity. From the catch basin filter evaluation, high removal efficiencies on
suspended metal/solids were achieved with low particulate loading in the filter chamber. The filter
performed well for the dissolved metal removal before the non-reversible saturation was reached. Each
kilogram of filter media has an absorption capacity of 52 gram oil and grease, 20 milligram Mn, and 16
milligram Zn.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-03-02
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0100954
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.