Say post's growth threatens San Pedro Environmentalists worried about the fate of the San Pedro River filed papers Thursday in anticipation of another lawsuit against Fort Huachuca. The fort's "incremental, piecemeal expansion" - and Sierra Vista's accompanying growth - are threatening one of the continent's hot spots for species diversity, according to activists' notice of intent to sue the military and the U.S. Fish and Wildlife Service. If the fort doesn't do something about the area's declining water table, the post must downsize so the river and its endangered species can survive, says the 83-page notice filed by the Tucson-based...