1. Standard Methods for the Examination of Water and Wastewater, American Public Health Association, Washington, DC, 14th ed., 1975, p. 565.
2. Fed. Reg., 49 (1984) 43234.
3. URL http://www.epa.gov/opppsps1/piclist.htm
4. URL http://www.epa.gov/opppmsd1/RestProd/
5. Title 40 United States Code of Federal Regulations Parts 141 and 142.