Imagine That Some of the Wells Around a City Have

Multiple Choice

Imagine that some of the wells around a city have begun to show elevated levels of a toxic substance.Without knowing what the toxic substance is,how can you use groundwater characteristics to determine what the source of the chemicals might be?

A) Without knowing what the toxic chemical is,it would be impossible to pinpoint where the source is.
B) Determine if there are any chemical factories in the area and report them to the authorities.
C) Use the gradient in hydraulic head among contaminated wells to estimate the groundwater flow paths
D) Determine which well shows the highest concentration and determine the closest source to that well.