Abstract
Two bacteriophages, MS-2 and PRD-1, were added to water to an initial concentration of 10 5 -10 6 pfu mL -1 in a trench-to-trench lateral groundwater flow and tracer migration experiment in the upper 5.5 m of a weathered and fractured clay-rich till. Phage were detected in water from seepage collectors set in the wall of a downgradient (gradient=0.24) trench, located 4 m from the source trench, between 1 and 2 days after the start of the injection. Peak phage concentrations in the collectors were typically 10 2 -10 4 pfu mL -1 , and detectable phage (>0.1 pfu mL -1 ) persisted for up to 5 days. In contrast, the travel time for bromide in the same trenches was several months
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