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Bohling, Geoffrey C. / A ground penetrating radar study of water table elevation in a portion of Wisconsin's central sand plain
[DNR-050] (1988)

I. Introduction: motivation and objectives,   pp. 1-9 PDF (2.5 MB)


Page 3

et al. (1986), conclude that " regardless of application rate, timing and
frequency, residues of aldicarb are leached beyond the rooting zone of
potatoes grown in irrigated sandy soils into underlying groundwater."
Aldicarb was first detected in groundwater in Wisconsin's Central
Sand Plain in 1980 (Wartenberg, 1988; Harkin et al., 1986). The Wiscon-
sin Department of Agriculture, Trade and Consumer Protection has
responded by declaring a moratorium on aldicarb use within a one-mile
radius around each drinking water well showing aldicarb concentrations
higher than the enforcement standard of 10 ppb. This regulation strategy
could be made more effective by delineating those areas which are particu-
larly sensitive and those areas which are less sensitive to contamination
and regulating the use of aldicarb (and other agricultural chemicals) based
on that knowledge. Rothschild et al. (1982, p. 444), conclude, " Delinea-
tion of sensitive areas should be based on the potential for aldicarb to
reach the water table and on the potential for the chemical to persist after
it has entered the ground-water system."
Recent investigators (Stoertz, 1985; Faustini, 1985) attempted to
map the distribution of areas of groundwater recharge and discharge in the
Buena Vista Groundwater Basin in the Central Sand Plain. Recharge
areas are those areas in a drainage basin where the net flux of water near
the water table is downward (into the groundwater flow system) and
discharge areas are those where the net flux of water near the water table


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