Hi folks,
This is a bar graph of Avg concentration of Ammonium, collected July 18, 2006, by Joanna and TJ. I made this using GE Graph . I got the data from your Blackboard site.

There are two data points that I had trouble with - TA Bridge (didn't see a data point for that) and Above Sunset Lake (the software didn't want a negative number.) I put zeros in for both of those points. But you'll get the idea of what can be done with GE Graph.