Test Drilling and Geophysical Logging Show Community Water Development Potential
The ISGS, along with Heneghan & Associates, Jerseyville, and Kohnen Concrete Products (drilling contractor), Germantown, test drilled and geophysically logged four locations based on the results of an electrical earth resistivity (EER) survey performed during summer 2007. The survey was a follow-up study from a 1960 EER survey completed by Merlin Buehle that located the existing wells and well field for the Village of Kane. The previous study identified a coarse-grained, alluvial (floodplain) sand and gravel channel running parallel to the existing floodplain and river. However, low data density from the 1960 EER study limited exploratory drilling to a north-south line from the existing wells. The recent study developed an EER grid that covered a 60-acre parcel in order to further delineate the channel deposit that was identified from the 1960 survey. Based on those results, four locations were selected for test drilling. The two surveys had very similar results except for a line of EER stations immediately north of the existing wells. There are several possible explanations for the sharp contrast in data between the two surveys, but, at the moment, the exact reason for the difference has not been determined. One possibility is the presence of drainage tile.
The test drilling and logging indicated that the alluvial aquifer was indeed limited and contained rather well-defined boundaries, which corroborated the results of the 1960 and 2007 surveys. Gamma and resistivity logs provided strong correlation with the surface data, and, considered with the test drilling, confirmed a bedrock channel along with the coarser-grained material. Unfortunately, the bottom 5 feet of unconsolidated material was a dense till/diamicton rather than coarse sand and gravel. Overall, the favorable locations reflected at least double the thickness of sand and gravel over that found at the less favorable locations. The bottom elevation of the alluvial deposit was higher, and the texture was finer, at the less favorable locations based on the EER surveys.
Since the initial EER study was conducted, the land containing the wells has been sold. The new owner has expressed less interest in developing new community wells on the property. The engineering firm and community are working with the landowner to reconsider allowing the community to expand its well field. This change in attitude is much more prevalent in the past five years than previously. Competition for resources, ethanol production, and the price of corn and soybeans have forced small communities such as Kane to consider buying larger tracts of land; in the past, farmers and landowners were much more willing to give up a few acres for wells