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A pollutant is dumped into a clean lake at a constant rate starting on July 1, 2000. When the pollutant's concentration reaches 90% of its steady-state value, the flow of the pollutant is stopped. On what date will the concentration of the pollutant fall to 1% of its maximum concentration? Assume that the rate constants of the increase and decrease are both 0.35 year-1.

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