Date of Award


Degree Name

Master of Science


Geological and Environmental Sciences

First Advisor

Dr. Michael J. Barcelona

Second Advisor

Dr. Michael R. Stoline

Third Advisor

Dr. Alan E. Kehew

Access Setting

Masters Thesis-Open Access


Data on the distributions of VOC’s (volatile organic compounds), principally trichloroethane and dichloroethylenes, in a shallow sand and gravel aquifer near Rockford, IL have been collected for a number of years. Synoptic sampling events from a dense monitoring well network within a greater than 4 mi^2 area, provide the basis for the evaluation of sources of variability in concentrations in space and time. Sampling, and analysis-related variability in these data contribute less than 10% of total variance. Spatial and temporal variability over periods of months to years are significant Results suggest that contaminant distributions can be resolved best by using more spatially distributed sampling points and fewer (i.e., quarterly rather than more frequent) sampling events per year.