Now showing items 1-2 of 2

    • Ground-water contamination in East Bay Township, Michigan 

      Twenter, F.R.; Cummings, T.R.; Grannemann, N.G. (U.S. Dept. of the Interior, Geological Survey, 1985)
      Glacial deposits, as much as 360 feet thick, underlie the study area. The upper 29 to 118 feet, a sand and gravel unit, is the aquifer tapped for water by all wells in the area. This unit is .underlain by impermeable ...
    • Hydrology and Land Use in Grand Traverse County, Michigan 

      Cummings, T.R.; Gillespie, J.L.; Grannemann, N.G. (U.S. Geological Survey, 1990)
      Glacial deposits are the sole source of ground-water supplies in Grand Traverse County. These deposits range in thickness from 100 to 900 feet and consist of till, outwash, and materials of lacustrine and eolian origin. ...