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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 1

I. INTRODUCTION: MOTIVATION AND OBJECTIVES
A. Contamination and Recharge
Incidents of contamination of groundwater by agricultural chemi-
cals in Wisconsin's Central Sand Plain (Figure 1) have led to increased
interest in protecting groundwater in this area. In particular, contamina-
tion by the pesticide aldicarb has received much attention in the past few
years. Aldicarb, marketed by Rhone-Poulenc Agricultural Company
(formerly Union Carbide Agricultural Products Division) under the trade
name Temik, is a water-soluble, soil-incorporated systemic pesticide. In
Wisconsin's Central Sand Plain it has been used primarily on potatoes to
control the Colorado potato beetle and the golden nematode (Harkin et al.,
1986).
Although it is only one of a number of agricultural chemicals that
could potentially contaminate groundwater, aldicarb has become the sub-
ject of particular attention for at least two reasons: 1) Its initial detection
in drinking water wells on Long Island, New York, in the summer of 1979
received much publicity and generated a number of studies of aldicarb's
contamination potential. For a summary of events related to aldicarb con-
tamination on Long Island, see Wartenberg (1988). 2) Aldicarb is viewed
as a worst case contaminant because it is highly soluble in water and it is
poorly adsorbed by soil matrix material (Rothschild et al., 1982). Harkin


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