about the scientific validity of WDNR's well construction guidance grew. This discovery made it
evident that additional research on well construction techniques would be necessary to attempt to
determine why some wells appeared to fail after following the WDNR's guidance. As a result, the
WDNR decided to conduct a follow up research study that would include re-sampling wells that had
previously participated in the Study of Well Construction Guidance for Arsenic Contamination in
Northeast Wisconsin, and adding additional wells (prompting this study). Since it had become apparent
that the town of Algoma was facing greater problems, the study focused on wells in that area.
Figure 2 shows a diagramatic depiction of this evolution.
Figure 2: Chronology of Arsenic Research and Guidance