The liner for a landfill cell has the cross section shown below. It consists of a 12-in.-thick clay layer sandwiched between sand layers of thickness 6 in. Permeability of the sand is approximately 100 times that of the clay. Water collects to a depth of 6-in. on top of the clay liner and flows through the 12-in. layer into a leachate collection system, which is drained to maintain a water level at the bottom of the clay layer. The time (days) for a contaminant to flow through the clay liner is most nearly: A. 1,000 B. 1,500 C. 2,500 D. 3,500
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