Browsing by Author "Cummings, T.R."
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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. ...