Publication Date


Document Type


First Advisor

Perry, Eugene C., 1933-

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Geology


Water--Composition--Illinois--Glen Ellyn; Groundwater--Illinois--Glen Ellyn


Chemical and stable isotopic data were collected from surface water, groundwater, and unsaturated soil water within the Lake Ellyn system during the interval from June 1982 to May 1983. Chemical data from two groundwater monitoring wells indicate the north well to be about twice as concentrated in total dissolved solids as the south well. A probable explanation is that less saline surface waters are rapidly infiltrating to the south monitoring well before substantial dissolution of minerals in the Pleistocene drift can take place. The relationship between (δ34)^(S)^S[sub SO4] values and sulfate- ion concentration indicates a mixing model with sulfide oxidation and precipitation being the dominant sources of sulfate in all samples collected. Oxygen isotopes in the dissolved sulfate provide evidence that most sulfate within surface and groundwaters is the result of surficial oxidation of sulfides. In addition, it is hypothesized that sulfates in waters from the north monitoring well were oxidized by about 15% atmospheric oxygen and 85% oxygen from local shallow groundwater. Oxygen isotope ratios in the water molecule from the south monitoring well mimic (δ18)^OH₂O values for precipitation, implying a significant rainwater component for that well. Seasonal variations in oxygen isotope ratios lead to the conclusion that there is no evidence to indicate interaction between surface water and the north well or between the two monitoring wells.


Bibliography : pages 58-61.


vi, 61 pages




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