If the surface stream water at Sample Site 3 is contaminated by the entrance of groundwater, could the pollution have come from either the waste pit or the pasture? How might you tell which is the case?
The question is based on Figure 25-3, a map of a hypothetical landscape with an effluent stream flowing from northeast to southwest. Water table contours are drawn at 2-foot intervals and flow lines show the direction of groundwater movement at the top of the zone of saturation. The waste pit in the north was dug down to a depth just slightly above the water table in that location. A fenced pasture for grazing livestock is in the east. Two wells are shown, and the locations of three water quality sampling sites along the stream are indicated.
What will be an ideal response?
Yes, The type of pollutants can be a clue. For example, organic contaminants such as might be found in animal manure might trace the source back to the pasture.
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