Using the retardation factor, estimate the time for DDT to reach a well 2km away if the pore water velocity = 0.1 m/day, the soil bulk density = 1.2 g/cm^3, porosity = 0.45, and the average soil organic carbon content = 0.01%. Assume that the soil organic carbon is the primary sorbent, the $K{oc}$ = 670,000 mL/g, and degradation and dispersion are negligible.
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