http://psep.cce.cornell.edu/facts-slides-self/facts/gr-wh-hw-grw85.aspx

It's intended to answer some questions relating to groundwater, as: what is it?; why is it important?; how to protect it?; where it comes from?; how it moves?; and, what are the grounwater contaminants? It presents a table of potencial groundwater contaminant sources, and one of community actions for protecting groundwater, and suggestions for further reading.