This study investigates whether the processes of natural attenuation of volatile organic compounds (VOCs) that function in groundwater at small-scale sites such as spills and leaking underground storage tanks also apply at large-scale municipal solid waste (MSW) landfills.

The purpose of this report is to document the activities completed under Wisconsin Department of Natural Resources Grant Nos. NMH00000183 and NMI00000261.

The basis for understanding the abundance and distribution of arsenic in groundwater is reliable chemical analysis. Improvements in sample collection, sample pre-treatment, and on-site and off-site laboratory determination methods are sought to insure that information about arsenic is of high quality.

The principal objective of this report is to determine what is well known and what is less well known about the regional groundwater system in southeast Wisconsin in preparation for a comprehensive model aimed at addressing important water-supply issues.

Because traditional culture-based methods of bacterial detection are of limited usefulness for environmental applications, molecular methods for the detection and quantification of bacteria are essential.

Nitrate contamination has long been known to be a problem in Wisconsin's sandy aquifers with shallow depth to groundwater (Jackson and others, 1987). Recent data suggest that 10-20 percent of domestic wells in agricultural counties across the state exceed the drinking water standard