Do I start by grading or spraying the grass to kill it? I will have whatever is recommended hauled in to cover the dirt and would like a good footing for my IR pony who is recovering from laminitis. Any suggestions would be so helpful! I was thinking perhaps a layer of screened sand rock on the bottom, then a thicker layer of coarse sand...would that be ok or is their something better? Thanks so much. 
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Tucker and Indigo
NC, Nov 2018
https://ecir.groups.io/g/CaseHistory/files/Tucker%20and%20Indigo 
https://ecir.groups.io/g/CaseHistory/album?id=80036