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Structures built on soils that tend to hold water (clay soils, for example) will have trouble because of the property of thixotropism.

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Oct 16,  · Aquifer vulnerability is represented by soil-drainage characteristics—the ease with which water and chemicals can seep to ground water—and the extent to which woodlands are interspersed with cropland. Credit: USGS. Groundwater can contain hydrogen sulfide or other naturally occurring chemicals.