Shallow seismic data are generally recorded such that multiple source impacts at the same location are stacked in the recording instrument, so finding data suitable for this ground roll removal scheme is difficult. One well-suited data set was available, a set of six separately recorded impacts with constant source location, recorded at a copper mine in Arizona. The fit of the ground roll appears to be very good, but there is precious little signal and plentiful noise. A single source impact from the mine data set is shown in Figure 1. A power spectrum for each impact is shown in Figure 2.