The educational objective of this exercise is for students to use a risk assessment tool to evaluate a hazardous release site and for students in grades 8-12 to increase their experience with geology, aquifers, soils, land use, pollution, data analysis, and map concepts. Students use background information on hazardous materials, the Environmental Protection Agency, and the Hazard Ranking System to complete a simulation activity. Students are given maps, site reports, and lab reports for a hazard release site and follow steps to assess the risk involved and give a priority ranking to the site. This teaching guide contains answers to worksheets, an introduction to the activity, background information, and instructions and worksheets needed for each step in the risk assessment. Topics related to the exercise include Earth science (geology); environmental science (pollution); mathematics (square roots, division, and formulas); and geography (map reading and natural resources). (LZ)