Naturally occurring concentrations of some toxic elements,such as arsenic,may exceed both recommended "safe" levels and wastewater standards for industry.
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Q27: What develops as a result of migration
Q28: Ground water contaminated with acid rain percolates
Q29: The pump-and-treat method is
A) The surface treatment
Q30: Pump and treat technique is used for
Q31: Use of microorganisms to break down toxic
Q33: Groundwater pollution in situ is commonly handled
Q34: Nonpoint pollution sources are more diffuse and
Q35: The threat posed by some synthetic chemicals
Q36: Dredging of a lake bottom
A) May be
Q37: A factory illegally dumps arsenic-rich wastewater into
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