PS1 staff and students spent a chilly Wednesday along Bear Creek on the 16th of April collecting water samples for the Sierra Club’s Water Sentinels Program.  Kirk Cunningham, Bill Myers, and Dan Ridgeway of the Sierra Club facilitated the outing.  Students collected samples that will be laboratory tested for the presence of E coli, Selenium, Nitrogen, Phosphate, and Copper, as well as taking and recording measurements of water temperature, conductivity, and dissolved oxygen content.  The Water Sentinels Program is an important grass-roots way for the public to monitor the health of their waterways, and to make sure our governmental agencies are doing all they can to keep our watershed clean.