No. 96-21074. September 30, 1997. Craig L. Stahl, Stephen J. Joncus, Bracewell Patterson, Houston, TX, Dale Ossip Johnson, Johnson Bearden, Austin, TX, for Plaintiff-Appellant. Rick Brass, Houston, TX, Charles Richard Fine, Ray, Wood Fine, Austin, TX, for Intervenor Plaintiff-Appellant. Henry Clay McGuffey, Dewey E. Helcamp, III, Austin, TX, for Defendants-Appellees. Appeals from the United States District Court for the Southern District of Texas. Before DUHE and BARKSDALE, Circuit Judges, and COBB