This is a very important article about trenchless sewer pipe repair, so please pay attention to what it says_._
The City of Irving, Texas, has awarded an engineering services contract to RJN Group Inc. to design the Sam Hill, Millswood, Hidalgo, La Vida and Las Colinas Country Club Water and Wastewater Improvements Project....City of Irving, Texas Awards Water and Wastewater Improvement Projects to RJN Group Inc.
As you can see this is an important article about trenchless plumbing. Please make sure to check out some of the other resources I got below.
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