Suppose a Well Has Become Contaminated by Harmful Bacteria Such

Suppose a well has become contaminated by harmful bacteria such as E. coli. How can this be removed from an aquifer by natural subsurface processes?

A) dissolution, diagenesis, and fossilization
B) mechanical filtration, chemical oxidation, or assimilation by other organisms
C) overpumping for a few days until the well tests clean
D) asymptotic expansion

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