Craig.....I did concrete for years plus the job you and I both use to do. I would NEVER bury a box like that into concrete. If it were me, I would put a metal pole (3" or 4" diameter) into the concrete and then bolt the box to the pole. You're just asking for issues with the box rusting out in a few years, coated or not. It looks like you could cut that box down.
You can run the grey pvc electrical conduit up to the box, but you must transition over to metal though the concrete and above ground to the box. I not electrically savvy enough to know if you need the grounding rod, but if you do, you need to make sure it's installed before the concrete work started. The rod is about 8' long and has to be hammered into the ground with about 4"-6" sticking up through the concrete.
Do it all to code and take lots of photos. If you later get caught, you can show that did it to code rather than dig everything up.
Lastly, I ran water to my RV slab and I was lucky enough to be able to run a sewer line about 20' to the front edge of my house where I was able to tap into the sewer system.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab