Irvine et al. (2011) used E. coli concentrations to identify
wastewater contamination in storm sewers. After a preliminary
visual inspection of the flow, the concentrations of E. coli were
measured at the storm sewer outfall, after 72 h of dry weather, even
though there was still some low flow in the sewer. A threshold of
12,000 CFU/100 ml, proposed by Pitt (2004), was used in this study
as indicative of wastewater contamination. In order to track down
the points of contamination entry into the system, the tracking
procedure recommended by Pitt (2004) was followed by collecting
upstream samples until the E. coli concentrations fell below the
threshold (Irvine et al., 2011).
Irvine et al. (2011) used E. coli concentrations to identifywastewater contamination in storm sewers. After a preliminaryvisual inspection of the flow, the concentrations of E. coli weremeasured at the storm sewer outfall, after 72 h of dry weather, eventhough there was still some low flow in the sewer. A threshold of12,000 CFU/100 ml, proposed by Pitt (2004), was used in this studyas indicative of wastewater contamination. In order to track downthe points of contamination entry into the system, the trackingprocedure recommended by Pitt (2004) was followed by collectingupstream samples until the E. coli concentrations fell below thethreshold (Irvine et al., 2011).
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