KARNES CITY, Texas -- For four months, Jeanne Shepherd took notes daily on the sounds and smells coming from a natural gas compressor station near her home here. The plant, the Patton Trust South Production facility, gathers and processes natural gas from wells drilled in the Eagle Ford Shale field. Shepherd said it made noises like howitzer fire when its flares lit and it gave off a low-level vibration that kept her from sleeping. The noise has decreased some since state inspectors visited the site in 2012. "Now it sounds like very distant artillery," she said in an interview. She continues to document noises and odors from other drilling sites around her 16-acre property almost daily. But the real bombshell may land in San Antonio, 50 miles to the north.