I would just go with an electric jack hammer. You don't need anything huge.
I did the same thing in my basement last year. I wouldn't bother with the
saw as it makes a huge mess. I'm talking about chunks and flying all over
the place. You can make a pretty clean line with just a round point on the
jack hammer. When you fill in the trench later, you want the edges a bit
rough for the new concrete to adhere to. But I'm far from a professional.
I'm sure at least one person will correct me if I'm wrong.
Just did that last month. Rented a 60lb electric jack hammer. I don't
think anything smaller would work very well. Used a pointy bit to get
started and then used a spade bit on the rest. It went well except for
where I had to go through a footing.
Here is a tip. To keep the dust down I filled my garden sprayer with
water, tightened the nozzle up to a mist and had my son occasionally
spray where I was hammerin' cement. Helped a lot.
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