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We compared velocities of the subsurface flow from a mounded onsite septic system towards a depressional wetland with three types of tracer; an inert gas, sulfur hexafluoride (SF 6 ), two fluorescent dyes, fluorescein and rhodamine WT, and a viral tracer, the bacteriophage PRD-1. The movement of both fluorescent dyes was significantly retarded in the soils compared to both SF 6 and...
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