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Cost-Efficient Ditch Provides A Sustainable Solution 
"Munising, Mich., needed a system that would weather the Upper Peninsula's harsh winters"
Water & Wastes Digest, June 2009 by Shawn Brown.
Link to Article - Link to PDF of Article - Tri-Oval
"Deep Ditch Minimizes Footprint," Water & Wastes Digest, Sept. 26, 2008 by Cheri Cohen. 
Lin An, Zhejian Province, China
Link to Article - Link to PDF file of Article - Tri-Oval
"Designed for Generations," Water & Wastes Digest, May 2, 2008 by Cheri Cohen. 
Madison, SD
Link to Article - Link to PDF of Article - Tri-Oval
"DO Control Maximizes Oxidation Ditch Treatment Efficiency," WaterWorld, February 2006 by Shawn Brown. 
Dawson, MN
Link to Article - Link to PDF of Article - Tri-Oval