Just got done replacing 50tons of soil with 3/4 clean stone. started a small raised patio on friday and we excavated to what we though was a sutibale base. then we started running the compactor on it just started pumping the water and moving like jello. so we started excavating a little further and what do you know, we found 2' of garbage soil the contractor brought the grade up with on the site. i thought we would never find the bottom of it. this had to be the biggest over dig stabilization we ever did. it looked like we where installing a swimming pool, not a patio. could not have done it with out our new 277B though, it was awesome climbing in and out of the hole with all of that muck. luckily the neighbor wanted all of the fill we dug out. wish i had taken pics, but was to stressed about getting it done and over with to stop and get the camera out.