1. American Society for Testing and Materials, Emergency Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites, Designation ES 38-94, 1994
2. American Society for Testing and Materials, Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites, Designation E 1739-95, 1995
3. Illinois Environmental Protection Agency, Tiered Approach to Cleanup Objectives, Guidance Document, Springfield, 1996
4. Massachusetts Department of Environmental Protection, Interim Final Petroleum Policy: Development of Health-Based Alternative to the Total Petroleum Hydrocarbon (TPH) Parameter, Office of Research and Standards, Boston, 1994
5. Michigan Department of Environmental Quality, Risk-Based Corrective Action at Leaking Underground Storage Tanks, 1995