The graph reflects the monitoring of dissolved oxygen concentrations at six stations along a river. The stations are located 20 m apart, with A the farthest upstream and F the farthest downstream. Where along the river did a sewage spill occur? At which station would you most likely discover dead fish?

Transcribed Image Text:

30 10 BOD Dissolved охудen LOxygen Upstream Downstream Monitoring stations Oxygen concentration (mg dissolved O/L water)