Laying a foundation for a large retaining wall

[Tangogreen]

Hello
I am building a high retaining wall. I have the engineer designs. There is a 1.5m x 6m reinforced slab which is has a sheer key so is both 25cm and 50cm deep. The first 1.05m is 25cm deep and the next 45cm is 50cm deep. It is specified to be concreted above a blinding layer of compacted 5cm MOT. I can't figure out how to get the MOT to stick to the edge of what I can only call a sheer cliff! Does it mapper if there is little or no blinding on the cliff edge?
Would be most grateful for any advice!

 

[Wayners]

You dig trench. Pour the concrete. Might need to shutter off?
Then backfill with MOT when shuttering is removed I guess.

Not my area of knowledge but seen it done a few times.