Spring Hill population jumped 1,600 percent since GM facility opened there . Future uncertain for about 3,000 workers ; GM could close , sell or phase out plant . Comment: Resident says anxious father-in-law mowed lawn five times last week .
Spring Hill population jumped 1,600 percent since GM facility opened there . Future uncertain for about 3,000 workers ; GM could close , sell or phase out plant . Facility began building Chevy Traverse SUV instead of Saturn about two years ago . Resident says anxious father-in-law mowed lawn five times last week .