Assume that a solute has a D* of 2.03 x 10-9 m2 / Sec and that w is equal to 0.5. If landfill leachate with a chloride concentration is next to a clay liner that is 2 m thick and the concentration of chloride is 2315 mg/L, what would be the chloride concentration at the outside of the liner after 25 years of diffusion. ? ignore any effects of advection. Defining a "release" from the landfill as a concentration exceeding 1 mg/l, how long will it take for a release to occur by diffusion alone? Provide answer in years to the nearest tenth.  Eg:    10.3

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