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report 84-4083
U.S. Department of the Interior Attenuation of Stormwater Contaminants From Highway Runoff Within Unsaturated Limestone, Dade County, FloridaWater-Resources Investigations Report 84-4083 By Bradley G. Waller, Howard Klein, and Lawrence J. Lefkoff
Infiltration of stormwater in heavily urbanized parts of Dade County, Florida, constitutes a prime source of recharge to the unconfined Biscayne aquifer, the source of drinking water for southeast Florida. Ponded stormwater at the test site contained greater concentrations of lead, zinc, manganese, nitrogen, (except nitrate), and phosphorus than that water which percolated through the unsaturated limestone. Attenuation of some stormwater contaminants in the surface soils and limestone is indicated at the test site adjacent to a busy roadway. Lead concentrations of 610 micrograms per gram and zinc concentrations of 91 micrograms per gram were found in the thin (about 1 inch) surface soils, nearly 20 times more than the concentrations of these metals at greater depth. In contrast, soil and rock samples at a control site remote from heavy traffic contained low concentrations of metals and showed little variation in concentration with depth.
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U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 04 January, 2005 @ 08:39 AM (KP)