Septic system installers know how to move dirt and lay pipe. Al Roggenkamp believes two other skills are a must for running a successful business — good public relations skills and an understanding of soil science.Roggenkamp, owner of Al Roggenkamp & Sons Excavating & Trenching near Wadena, Minn., recalls installing his first septic system, a concrete block seepage pit with curved, open-joint blocks made by a local silo company, for a widow who added onto her home to have indoor plumbing more than 35 years ago. There have been scores of regulations in the industry since. “The biggest change is
