Thanks Michael, unfortunately proponent does not allow us to start any activity in this area, unless we satisfy him by some written proof that this hammer induced vibration will not harm his system.
Though vibration of hammer in soil would exert some vibrations on pipe. What if I assume this vibration just like harmonic response by a reciprocation compressor (i.e. Soil is sending vibrations on my pipe like a pump, I guess noise as well to some extent but it could be ignored.

If you can guide, what are limitations if I try to generate earthquake spectrum of this case?