I have removed a large root ball prior to building a patio. The size of the hole is approximately 3 feet by 12 feet and a depth of 3 feet. I plan on raising the area another foot above grade. After compation of remaining soil, I will place a geotex. I spoke to my supplier and he said compacted crusher run best. An engineer friend said 57 stone, then geotex and complete with crusher run. The archives indicate various opinions including a layer of concrete. What is the best way to proceed?