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When we built ours, we had a hell of a lot of crushed concrete etc delivered, to raise the whole thing about 6 inches off the ground - best drainage ever! Then a load of type 1 to create a decent, smooth and hard surface. Roll that down as hard as you can get it. If you can leave it for a couple of weeks to really settle, make sure it is still all even, and level out any areas that may have sunk. Then put a membrane over the top. Then 4 inches if sand, and 18 tonnes of shredded rubber - works a treat! Keep it wet in the summer, and we find to make it really nice, grade it, then roll it, makes it firm but spongy - just what you want. remember what you are trying to recreate - turf. Thats what horses work and jump best off, when the ground is right. The point of the arena is to have those ideal conditions all year round, whatever the weather. What im trying to say is dont make it just sand, you have to put constnt water on it to make it work and be a decent riding surface - not ideal if you are on clay! Sand with rubber works real good, just buy the decent rubber that will sit on top as much ap poss, and ont mix in too much, although it needs to a bit sorry for the long post!
Ben
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