Big Explosion in Elgin, SC

Oddly I heard a sound and felt a rumble like one of the kids jumping from the top bunk around 7:02 PM March, 29th, 2007 around Elgin, SC. It was funny the kids jumped up and all the neighbors piled out of their houses. "What was that?" echoed through the neighborhood. I couldn't localize the sound but here is a Google map near where we heard it. It'd be way cool if we could triangulate the noise using Google maps.