AUSTIN, Texas— The Center for Biological Diversity and Save Our Springs Alliance today filed a notice of intent to sue the Texas Department of Transportation and U.S. Fish and Wildlife Service over an Austin highway construction project’s threats to the federally endangered Austin blind and Barton Springs salamanders. The conservation groups recently learned that the MoPac Intersections Project has exposed at least 21 underground caves, sink holes and other karst features that provide habitat for the endangered salamanders. There is a high risk that construction will pollute the two species’ habitat by introducing silt and pollutants to the subsurface. The...