Problem with vibrations from compaction testing

[ctmcmull]

I recently purchased a new automatic rammer to do compaction testing. The thing works great - possibly too great. Now I'm causing vibrations in the office building, which have become a problem for our neighbors. The vibration manifests itself as noise on the third floor, which is the top floor (no noise on the second floor. Hmm.). I think this must be an energy reflection issue at the top of the wall. Short of moving the compactor to a new location (not practical), does anyone have some insight on my proposed solution:
ASTM and AASHTO both require a "rigid foundation," such as a 200-lb concrete block. This provides inertial resistance during compaction. I propose to mount the compactor and concrete block on a cart with large pneumatic wheels, which will reduce the stray vibrations that reach the concrete floor. I can meet the 200-lb block part, but I'm definitely in the gray area as far as the "rigid foundation" part goes. I know that field labs are often in van-trailers, and so are supported by tires. These installations can pass ASTM and AASHTO muster; does my idea sound like it would raise an inspector's eyebrows?
I've considered other ideas, such as saw-cutting the slab around the compactor, but I'd like to try a non-invasive option first.

 

[VAD]

As far as I know trailers are often blocked up so that tires are off the ground. Compaction blocks bear directly on solid ground. My suggestion is that you go with your idea of cutting the slab.