The soil in and around the Walker quarry has become contaminated! It is up to your students—as forensic scientists—to perform tests and use problem-solving skills to determine who is responsible for the contamination. Students will perform chlorine, iron and pH tests on samples from various locations of the quarry to solve the mystery. A fun activity that will surely peak your students' interest. Kit includes all materials to perform the activity, easy-to-follow procedure, and multiple scenarios to select from. Complete for 30 students working in pairs.