Need help with a ground level deck...

I am looking into building a ground level L-shaped deck, roughly 12 x 10. Needs to be low as the bulkhead is right in the middle on the plan, and the access to the cellar must remain.
I recently decontrcuted a sandbox that was on my property that was 8 x 8 and made with pressure treated wood that is still in decent shape. I was thinking to use these as beams to lay the decking on.
I want to anchor these beams into the ground, but not sure how to do this. 2 foot dep holes and quick dry cement?
Also, as the deck will be about 6 inches high, do I have to remove the grass underneath, or will it just turn brown and die?
Thoughts are appreciated.
Bluesman
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I built a 16' x 24' deck directly on grade 15 years ago, and it has lasted well without any shifting.
I used a non-selective weed killer (Killex or RoundUp)then I built up 2 ridges of small crushed stone (maximum 1/4") about 6" high and 3' wide and as long as the deck design. The stone needs to be firmly compacted and carefully leveled.
On top of the ridges, I placed 4'x4' beams, laid landscaping fabric to prevent weed growth, then I placed the deck joists on top of the 4x4s at 90 degrees at 16" centers. I used pressure treated lumber all-round.
Good luck.
Mr. Fixit eh.
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