Pumper and Cleaner Environmental Expo International 
Annual event held in February that offers a wide variety of equipment and products for the liquid waste industry.
http://www.pumpershow.com/LECET 1998 Fall Newsletter: Trenchless Technology Training Now Available 
The one week, 40 hour course, Trenchless Pipe Rehabilitation and Remote Camera Operation, provides hands-on training with pipe rehabilitation and camera equipment at the Construction Laborers Training Center in Lino Lakes, Minnesota.
http://solidarity.com/1998Fall.htm
Water Environment Federation's Technical Exhibition and Conference (WEFTEC) 
Where the water and sewer industry does business. Typically, more than 700 exhibitors bring their latest equipment and products on site for demonstrations, plus trained sales staff who can answer technical and purchasing questions.
http://www.wef.org/ConferencesTraining/Conferences/WEFTEC/