This is taking shape.
You don't provide quantities anywhere. This is essential for a teacher planning to use this. Put it up front in the materials list. Don't force yourself to have to read the entire thing to make a shopping list each time you want to run this. Think efficiency!
This should be expanded. What specifics can be discussed with students. What can they actually do? Provide some leading questions, and some web-based resources (EPA comes to mind) to facilitate additional research and questioning.
This project is ripe for a writing assignment. How might you facilitate that