Student collecting water sample at one of the watershed locations to test them for E. Coli, total coliform bacteria, and optical brighteners. 
What do the students do?
YSIs are used to test the temperature, pH, salinity, conductivity, and dissolved oxygen levels of the water at each location. 
 Students take water samples and return to the lab to run tests for bacteria such as e. coli and coliform, optical brighteners, ph, and chlorophyll a.