Figure 3.

Concentration as a function of discharge for select hormones and wastewater micropollutants in Main Burlington Vermont wastewater treatment plant samples November 2007 to December 2008. These lines are tobit regression lines used to determine loads from combined sewer overflow bypass and treated plant effluent discharges. For all analytes except caffeine, nondetected values are plotted along the x-axis at a value corresponding to 1/2 of the reporting level concentration. For caffeine, nondetections are plotted at 100 ng/L (1/2 of the reporting level).