My wife and I are selling our property and upon a house inspection it was discovered there was an oil tank buried in our back yard. We originally called a number of companies and found only two that we felt comfortable hiring. In the end we hired Cerc because we saw good reviews on a number of websites (including here).
The tank was out fairly quickly, but there was quite a bit of mess because they were working while it was raining, so that took them quite a bit of time to clean up. Overall good experience