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Extra resources for A review of the USGS National Water Quality Assessment Pilot Program
Page breaks are true to the original; line lengths, word breaks, heading styles, and other typesetting-specific formatting, however, cannot be retained, and some typographic errors may have been accidentally inserted. Please use the print version of this publication as the authoritative version for attribution. NAWQA DESIGN EVALUATION 34 those of the surface water CSUs; in some cases, ground water CSU boundaries coincided with those of surface water CSUs. Each set of CSUs was screened using a modified linear programming model (Fox and Scudder, 1986).
The committee, however, believes strongly that the USGS must include in NAWQA consideration of those lakes that significantly affect downstream or downgradient water quality. This consideration should involve more than just upstream and downstream monitoring of water quality, and should include some degree of mathematical modeling. If developed in the early stages of a study unit, a preliminary model can be used to establish the potential significance of existing lakes, and to guide the monitoring program.
For example, aldicarb is often associated with high ground water tables and sandy, mineral soils, where its fate and transport are controlled and its mobility limited by sorption on mineral surfaces and microbiological degradation under fully saturated conditions. However, in the presence of a large unsaturated zone and/ or more organic soils, aldicarb may behave quite differently because of the potential for partitioning into the soil gas and organic solids. Designing management practices to control contamination by this pesticide and then evaluating those practices cannot be accomplished without understanding the mechanisms responsible for its fate and transport.