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I just reread the OP and see that he wants the wall 10' back. Can you make the front shale wall, or perhaps a short wall like the other wall, at the edge of the grass where it is flat so that you can build your base over the shale and build the grade in front of your wall to make it work?
How much higher does your base have to be than what is at the lawn (or driveway or walk) where the shale becomes a nonissue?
A low border wall even as high as 18" will compliment the taller wall without seeming big and intrusive.
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