okay---RR is correct. Not only that---many places you'd need a demolition permit to remove and fill in a swimming pool in the prescribed manner. This was not a pool, but a 50-year old brick ranch near me was vacant, and then occupied by squatters. Well, the squatter was a cross-dresser who was living in the basement amid much cardboard and debis and lighting it with candles, which caused a fire that burned through the roof of the house, destroying it and killing the squatter. Well, it only took a day or two to remove the house, but the rest of the week to remove the concrete foundation and basement. They did not just fill 'er in with dirt and call it good.