1. Davies, T., 1994. Use of Water Effect Ratio in Water Quality Standards. EPA-823-B-94-001. http://www.epa.gov/waterscience/library/wqstandards/ratiomemo.pdf.
2. Prothro, M., 1993. Office of Water Policy and Technical Guidance on Interpretation and Implementation of Aquatic Life Metals Criteria [“Metals Memo 2”]. EPA- 822F93009. http://www.epa.gov/waterscience/library/wqcriteria/metalsinterpret.pdf.
3. Stephan, C.E., D.I. Mount, D.J. Hansen, J.H. Gentile, G.A., 1985 Chapman and W.A. Brungs. Guidelines for Deriving Numerical National Water Quality Criteria for the Protection of Aquatic Organisms and their Uses. PB85-227049. National Technical Information Service, Springfield, VA. or http://www.epa.gov/waterscience.
4. US Code. 1977. The Clean Water Act (CWA); 33 U.S.C. ss/1251 et seq. http://www.epa.gov/epahome/laws.htm.
5. US Code. 1980. Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA or Superfund) 42 U.S.C. s/s 9601 et seq. http://www.epa.gov/epahome/laws.htm.