New Wells Constructed in the Mahomet Aquifer to Support Water Supply Planning in Mason County

Mahomet Aquifer drilling and well equipment

Two new stratigraphic test holes were drilled and three new wells were constructed by the ISGS in southeastern Mason County in early November to further develop a regional groundwater monitoring network for the Imperial Valley Water Authority. Geologic interpretations made from continuous cores collected from the stratigraphic test holes were used to locate new wells accurately in the Mahomet aquifer and overlying Glasford aquifer, and to determine the geologic unit in which an existing well was screened. The construction of new wells was done for the purpose of characterizing the hydrogeology of the region in support of regional water supply planning in east-central Illinois.

Mahomet Aquifer Drill equipmentJack Aud, Richard Padilla, and Aaron Blacker completed the drilling and well construction; Andrew Stumpf catalogued and described the cores; Timothy Young collected geophysical logs in open boreholes; and Kevin Rennels (Illinois State Water Survey) installed downhole sensors in the wells that collect groundwater levels continuously. George Roadcap (Illinois State Water Survey) led the project, which received partial funding from the Imperial Valley Water Authority to conduct the drilling and well construction. The ISGS provided additional funding to collect the continuous core and geophysical data from the test holes. These stratigraphic boreholes were drilled in an area rarely studied, and the two cores are the first collected over this part of the Mahomet aquifer.