Serving the Dallas / Fort Worth area since 1984, Tri Dal, Ltd. has always put its customers' business priorities first! Because of that commitment, and our strong, on-going customer relationships, we have established offices in the Austin areas to serve those markets. And we are still growing, looking for ways to serve you better.. Earthwork/ Mass grading,Underground Utilities; Water,Sanitary Sewer,Storm sewer,Fire lines.