Leachate Migration from a Solid Waste Disposal Facility Near Biscayne National Park, South Florida (
by Bradley G. Waller, US Geological Survey, Miami, FL, USA,
James L. Labowski, US Geological Survey, Miami, FL, USA,
Abstract: Leachate from the Dade County Solid Waste Disposal Facility (SWDF) is migrating to the east (seaward) and to the south from the currently active disposal cell. Water levels and ground-water flow directions are strongly influenced by water-management practices. The SWDF is constructed over the salt-intruded part of the highly transmissive Biscayne aquifer and because of this, chloride ion concentrations and specific conductance levels could not be used as indicators of leachate concentrations. Leachate was detected in multi-depth wells located 75 meters to the south and 20 meters to the east of the active cell. Concentrations of water-quality indicators had mean concentrations generally 2 to 10 times higher than baseline conditions. Primary controls over leachate movement in the SWDF are water-management practices in the Black Creek and Gould Canals, configuration and integrity of the liner beneath the active cell, and low hydraulic gradients in the landfill area.
Subject Headings: Leachates | Waste disposal | Solid wastes | Stadiums and sport facilities | Solid mechanics | Aquifers | Water pollution | Groundwater flow | Water flow | North America | Florida | United States
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