This fact sheet is one of a series of Rural Clean Water Program Technology Transfer fact
sheets prepared by the NCSU Water Quality Group with support from the Extension
Service, U.S. Department of Agriculture (Cooperative Agreement No. 93-EXCA-3-
0241).
Copies of the fact sheet series may be requested from: Publications, NCSU Water Quality
Group, Department of Biological and Agricultural Engineering, Box 7637, North
Carolina State University, Raleigh, NC 27695-7637, Email: wq_puborder@ncsu.edu,
Fax: 919-515-7448.
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