i know this has probable been asked before but i did a search and could not come up with a solid answer. I am buinding a 32 foot long wall, highest section is about 2.5 feet high, and it will taper off to about 2 courses on the other end.. the soil has a sandy texture and will be backfilled with black dirt. In this type of application is geogrid necessary? I do have fabric to put behind the wall, and a load of 1" crushed stone for drainage. Is the 1" crushed stone also ok for under the wall or would something else be better? i have built only 1 other wall before and it was not as large so I di dnot use geogrid or fabric, but a lot of stone and it seems to still be holidng well. I am just concerned to be sure i do this one right.