Ongoing Monitoring Results Pilot Stormwater Disposal Facilities, Pierce County, Washington

by Molly Adolfson, Adolfson Associates, Inc, Edmonds, United States,
Dan Clark, Adolfson Associates, Inc, Edmonds, United States,

Document Type: Proceeding Paper

Part of: Water Resources Planning and Management: Saving a Threatened Resource—In Search of Solutions


The three stormwater disposal facilities evaluated appeared to increase in pollutant removal effectiveness after approximately 4 to 5 months of operation. This may be due to the deposition of fine sediments in the pore spaces of the infiltration trenches and/or the filter fabric resulting in enhanced sediment trapping efficiency. At the time of this writing, nine out of a total of 21 storm events have been sampled. Based upon preliminary data, it appears that subsurface disposal facilities (SDF) designs 2 and 3, in particular, are effective in removing some of the constituents contained in stormwater. Greatest removal appears to be with large-diameter particulates, including total copper, lead and zinc, and Total Petroleum Hydrocarbons. The facilities do not appear to significantly affect the removal of soluble constituents. Dissolved metals, in particular, were not significantly removed, however, concentrations in influent stormwater were near the detection limits.

Subject Headings: Stormwater management | Groundwater pollution | Runoff | Sediment | Infiltration | Storms | Non-renewable energy | Water pollution

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