That's what I see too. Why is there a gap at the base of the wall?

Not sure. There should be a buried brick base throughout the entire wall no matter the level correct? He used crush & run in a couple of spots instead of brick to keep it level.

Many such walls have a tamped crusher run base, but placed deeply enough that none of it would show at the grade surface.

Crushed stone makes a terrific footer; it drains extremely well. That's why railroad beds haven't suffered frost heave for several hundred years.

Why the wash away? Is this repairable?

Stuff more back in and see what happens in the next rain storm.

You have an obvious gap. It shouldn't exist.

Your photos tell the whole story. Your gravel base should not be leaking out or exposed above grade. This is not a suitable installation.

Can it be repaired or does the wall have to be removed and rebuilt? I was thinking maybe crush with concrete edge?

Wow scary looking hope you know how to fix it, or where to get help!

The crushed stone base should be bellow surface and have a min 4-6" projection on each side. the way they did it, this will wash away and the wall will sag or fall apart, seen it many times it happens to the improperly installed piers or garden walls.

If you in a 4 season region this will not last one winter.

I would insist on it being rebuilt. Is the wall freestanding or retaining?

Freestanding

The only thing holding those blocks together is glue. The only thing keeping that wall from toppling over is the fact that it's glued to embedded block. If you don't have embedded block there's nothing but luck keeping the wall from falling down and going boom. Dude mismeasured, misestimated, or both, and tried to get away with it.

Spoke with him this morning. He said this was for the water to be able to escape.

(directed at the contractor not you)

No offense taken. I'm just trying to make sure my area gets built correctly

So bottom line, you can't use your base material for drainage. The idea of the crusher run stone we use as a wall base is that it compacts really tight because of all the fine particles. It's kind of the opposite of a stone you would use for drainage. And then obviously, of course, you have a situation like this where you wall is being undermined.

Simplest way to handle drainage would've been to pitch the patio towards the lower grade and put weepholes in the wall. Second simplest would've been to pitch the patio in whatever direction and run a channel drain along the length. Either the contractor really believes this is an acceptable way to drain an enclosed patio (which, yikes) or he's trying to justify something that I wouldn't accept.

Thanks everyone! I've found a pic of what he did when it was being built. @Revolutionary Gardens @GN Builders L.L.C @Yardvaark @Joseph Corlett, LLC @KD Landscape

Thanks everyone! I've found a pic of what he did when it was being built. @David Marciniak @Greg GN Builders. @Yardvaark @Joseph Corlett @John Algozzini

He should have run at least one or two more blocks out on the lower course because of the slope to support the block above it. It is wrong and that will have to be corrected. It is not installed correctly. This was not for drainage. Just an excuse you should not buy.