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Sorry, but you're going to have problems with your decking. The supports should be 4" posts concreted 2' into the ground. At very least, jack it up and replace the bricks with 18" slabs to spread the load. Also, get some weedproof permeable membrane and put it under the entire deck or you'll have grass growing up through the gaps. If you would like any free advice, send me a PM with your number and I'll give you a bell. PS: I build deckings for a living....
Cross post from the DIY thread but you can see the grass here too