Filling a Pit to Create a Concrete Pad
I have a concrete pit in an area of my patio. It is about 8' by 10' and about 3' deep. It had a self-contained hot tub in it until pack rats set up housekeeping underneath the hot tub and destroyed all the wiring.
I've removed the hot tub unit from the pit.
The patio surrounding the pit is flag stone. There is a 220V service in to bottom of the pit
Now I want to, as economically as possible, bring that electric service up to patio level, and fill in the pit making the surface a decorative concrete flush with the flagstone patio.
Can anyone advise me as to some ways of filling the pit and creating a firm, level foundation for the concrete pad?