breaking concrete

[swampydrill]

I am planning on putting a wall round part of my garden, i gave work to a guy to do the foundations for a 3ft wall while i was away. When i came back he dug the foundations with a mini digger about 18 inch from the path and the foundations are 22 inch wide. I want to take the wall foundation right up to the path which is my boundry . I then want to take some of the existing foundation out. Whats best thing to break it up and would it weaken what is left.
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[swampydrill]

I have been recommended a Kango 2500 by the tool hire shop to break up this concrete, the guy who is going to do the brick work said get a hydraulic one if possible as the electric ones are not that good, is that wise advice or are the electric ones good enough for concrete 1ft thick

 

[nickjb]

If the concrete isn't that old it won't be especially hard. My cheap electric breaker will do 1 foot of concrete so I can't see it being an issue.

 

[swampydrill]

It has been in around 8 days so I guess it will be hard but not fully