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Fig. 3. Time to appearance of bromide tracer in the percolate at 10 and 50% of the applied concentration (BT10 and BT50, respectively) and their ratio at system start-up after 8 and 45 wk of operation. AF-60, aggregate-free infiltrative surface with 60-cm vadose zone; AL-90, aggregate-laden with 90-cm vadose zone.