My quote 10 x 38 entrance with a 30 x 30 pad. $5700. Includes removal 2 in crushed limestone, wire mesh, 5 inches of concrete, sealed. Im in Buffalo New York. My question is the base. The ground is not normal ground. There was a house there that was torn down and the basement(which will be under the majority of the pad) is filled with brick and a little dirt. My understanding is the base is for drainage and to support the concrete. Is 2 inches ok when you have 10 ft of brick and good drainage? Plan on parking cars, vans and the occasional dirt delivering for gardening. What are you opinions?