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> report 91-4135
US Department of the Interior
US Geological Survey
WRI 91-4135
Effects of Dried
Wastewater-Treatment Sludge Application on Ground-Water Quality in South
Dade County, Florida
Water-Resources Investigations Report 91-4135
By Barbara Howie
PURPOSE
AND SCOPE
This report evaluates
the effects on ground-water quality caused by the application of Dade County's
domestic wastewater-treatment sludge to farmland. The evaluation is based
on onsite field measurements and on the analysis of nutrients, selected
major ions, trace elements, and organic priority pollutants sampled at the
four test sites from 1985 to 1988. These data were interpreted by: (1) the
quantitative comparison of presludge and postsludge concentrations: (2)
the statistical comparison of upgradient, center-field, and downgradient
concentrations: and (3) an assessment of the results in terms of what is
known about chemical attenuation processes. This report discusses results
related to sludge application only. It does not consider water-quality changes
related to other agricultural practices, as discussed in Howie (1986), nor
does it discuss changes related to preexisting trends, such as increasing
salinity.
(The entire report
is available below.)
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