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Observed E coli concentrations in T1.1 wells following artificial pond filling on July 1, 2009. The error bars represent 95% confidence intervals and the horizontal dashed line represents the detection limit of 0.5 MPN/100 ml based on duplicate 100 ml water samples40. The data in the box on day 3 has been published previously in Knappett et al. (2012)25.
