1. EBA, Inc., P.O. Box 554, 2900 Quakenbush Road, Snow Camp, North Carolina 27349, USA
2. Current address: Springborn Smithers Laboratories, Inc., P.O. Box 2005, Sisters, Oregon 97759, USA
3. Parametrix, Inc., 1600 SW Western Blvd. Suite 350, Corvallis, Oregon 97333, USA
4. Current address: USEPA, NHEERL/Western Ecology Division, 200 SW 35th St., Corvallis, Oregon 97333, USA
5. ENVIRON-METAL, 1307 Clark Mill Road, Sweet Home, Oregon 97386, USA