Urban Stormwater Quality Characteristics from Paved Surfaces

Urban Stormwater Quality Characteristics from Paved Surfaces
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Constituent (concentrations reported in mg/L)	Wisconsin Data1					Twin Cities Highways2
	Arterial Street	Feeder Street	Collector Street	Collector Street	Residential Driveway
Cadmium	0.0028	0.0008	0.0017	0.0012	0.0005	0.0025
Chromium	0.026	0.007	0.013	0.016	0.002
Copper	0.085	0.025	0.061	0.047	0.02	0.023
Lead	0.085	0.038	0.062	0.062	0.02	0.242
Zinc	0.629	0.245	0.357	0.361	0.113	0.123
Nitrate-Nitrite						0.77
Total Phosphorus	1.01	1.77	1.22	0.48	1.5	0.43
Total Dissolved Phosphorus	0.62	0.55	0.36	0.07	0.87
Chloride3						11.5
Total Suspended Solids	993	1152	544	603	328
Suspended Solids	875	1085	386	474	193

¹ Arithmetic mean concentration; Reference: Roger T. Bannerman and Richard Dodds, Sources of Pollutants in Wisconsin Stormwater, 1992
² Reference: University of Minnesota Water Resources Center, Assessment of Stormwater Best Management Practices Manual, 2008
³ Data represents chloride concentrations during monitoring season, typically April through October. Chloride concentrations in winter snowmelt grab samples have been found to be as great as 3,600 mg/L.