[TowerTalk] Jackhammer removal of tower base difficulty?

[Rob Santello]

   First, thanks to all for the help identifying the Force 12 XR-5 and 
(probably) Ham IV rotor on that HDX-555 tower last week. Once the tower 
is gone, the widow really wants to  have the concrete base gone too. My 
suggestions of building a deck over it was not an option. I remember you 
guys talking about using a jackhammer to remove the top  down a few 
inches below grade to fill with top soil and throwing some sod over it. 
Has anyone actually done this? How difficult is it to bust a solid block 
of concrete like this. I don't know what concrete mix was used for the 
base if that even makes a difference. If possible, how long would it 
take and is a standard size electric jackhammer from a rental place 
large enough to do the job?

Thanks again for any thoughts or suggestions!
--rob
K6DQ