In a similar situation, I work from home and inside my office I can hear the gun range at Camp Bullis near my house here in San Antonio most weekdays. They go for hours most days, but not today. Some days I think I hear the tracks from a tank or something driving around at the base. Between that and the Quarry blasting away every couple days, it can get a little interesting. The blasts sometimes last more than a few seconds, rattle windows and I can feel the ground shaking.