Geo textile grid and about 8" of stone would tie everyting in just fine LOL

That whole hillside needs to be cut back in order to add either geotextile fabric or some sort of deadman holdback.

Took a LOT of digging, some special geotextile fabric, and a lot of replacement dirt to fix it... until the next area opened up.Good luck.  

So if you figure your area and convert to yards, multiply by 500 and divide by 2000 will give you tonnage also.If you're needing a base you can use a geo textile if you do not want to buy #2 stone (big rock, 2 to 3").

Dynamic soil problems (clay on schist, etc.) have historically only been stabilized with expensive pylons or other mechanical methods, although advances in geo-textiles and other high tech engineered solutions are becoming more widely used and available.A problem purely related to a foundation, such as a cracked slab, can be identified and the remedy and its cost/risk estimated fairly closely and kept within budget.Many years ago I sued (and won) a large tract home builder and their grading engineering firm.

If you can't do much to change the grade, you can install a Geotextile membrane around the perimeter.You don't want to put this all back together until it's right or else you will haven this problem again and again.

There must be an adequate number, space, and length of the deadmen to keep the wall in place.4) The geotextile wall is a variation of the deadman wall.

It can be as crude as a trench filled with gravel or include piping and geotextile fabric.- When the drain system cannot be terminated to daylight, then the system is often terminated in a sump crock/pit in which a sump pump is added.