(near Webster City, Hamilton
Three dedicated groundwater monitoring wells were drilled at
Briggs Woods Park
near Webster City in Hamilton County. Briggs Woods 1 is 35 feet deep and is
monitoring the water table in the Quaternary till above the bedrock aquifer. The
next deepest well (Briggs Woods 2) is 110 feet deep and allows us to monitor an
upper aquifer zone (St. Louis-Pella Formations) in the Mississippian aquifer.
Briggs Woods 3 is 410 feet deep and taps water from the lower portion of the
Mississippian aged Maynes Creek Formation.
Core descriptions (Quaternary
stratigraphic section have been prepared for each well.
Pump tests were performed on all three wells to determine the water level
response when the wells were pumped. During the well drilling, isolated
intervals were selected for water quality analysis. These intervals were
isolated using a packer (an inflatable device) and then water samples were
Water quality analyses were performed on the two deep wells in July 2002 and
April 2003 (click
here for analysis results). At these times, the shallow well was not producing enough water for
sampling. These wells will continue to be sampled to monitor the water quality
in these aquifers.
Water level data (feet below ground surface)
Photos (click to enlarge)
Close-up of rig