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Use of a Stormwater Filtration Device for Reducing Contaminants in Runoff From a Parking Lot in Madison, Wisconsin, 2005–2007
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2008-09-01
[PDF-560.39 KB]
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Edition:Draft Final Report
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Abstract:In June 2003, a proprietary stormwater filtration device (SFD) was installed at an employee parking lot in downtown Madison, Wisconsin. A total of 26 filter cartridges were used to treat stormwater runoff from the 0.91 acre asphalt parking lot. Automated equipment was installed to measure flow and collect water-quality samples during storms at the inlet, outlet, and bypass pipes of the SFD. Thirty-three organic and inorganic constituents or physical properties plus particle-size distributions were analyzed for in samples from the inlet and outlet, 18 of which were polycyclic aromatic hydrocarbons (PAHs). Water-quality samples were collected for 51 runoff events from November 2005 to August 2007. Samples from all runoff events were analyzed for suspended sediment concentrations, whereas samples from 31 of the runoff events were analyzed for 15 of the constituents. Samples from 15 runoff events were analyzed for PAHs, and samples from 36 events were analyzed for particle size. The treatment efficiency of the SFD was calculated using the summation of loads (SOL) and the efficiency ratio methods. Constituents for which the concentrations and (or) loads were significantly decreased by the SFD include total suspended solids (TSS), suspended sediment, volatile suspended solids, total phosphorous (TP), total copper, total zinc, and PAHs. The efficiency ratios for these constituents were 44, 43, 38, 55, 22, 5, and 45 percent, respectively. The SOLs for these constituents were 32, 39, 28, 36, 23, 8, and 48 percent, respectively. Both the SOL and efficiency ratio were negative for chloride of about 20 percent. Six constituents or physical properties, dissolved phosphorous, chemical oxygen demand, dissolved zinc, total dissolved solids, dissolved chemical oxygen demand, and dissolved copper, were not included, because the difference between concentrations in samples from the inlet and outlet were not determined to be significant.
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