I don't know your concrete guy, so this might not apply, but be very careful of those guys who don't use chairs for the rebar. I've only seen this done here in East Texas, but for some reason, they like to leave the rebar on the ground, then pull it up by hand to center it in the pour.
I've seen enough jobs done like this to know it doesn't work. They get some of it up, but it's not consistant, and you will have areas where the rebar is at the bottom of your pad.
Rebar needs to be in the middle of the concrete to have it's maximum strength. At the bottom or top of the pad, and it's almost useless.
A very large bag of plastic chairs isn't very much money. If I was you, I would insist that they have chairs under the rebar befor pouring. Don't rely on them saying they will, be sure to make sure!!!
When I'm the General Contractor on a job, I make the concrete subs angry by doing this, but I'll supply the chairs and force them to do it my way. They grumble and tell me it's a waste and it's not needed, but when it's all said and done, I know the rebar is where it's supposed to be.
This is also why I don't like wire for pads. It's impossible to get it centered in the concrete, and even though wire is stronger then rebar when poured correctly, it's rarely true because the wire is always at the bottom of the pour.
Your place sure looks nice after you mowed!!!!
Eddie