I agree that management of the property, and associated liabilities, are a significant concern.
I'm not holding my breath for any full size ORV access on SC state owned land with the current economic environment.
By SCEPA you must mean SCDHEC. There will be some erosion and sediment control issues with disturbed land, just like with grading land for development but I don't think those will be so onerous, arbitrary and/or capricious that they will keep a full size vehicle ORV park from opening in SC on private land.
USEPA's locally represented by SCDHEC, but still another entity to contend with. The overall problem isn't with private land I was more so speaking of the Gov. owned lands. They do have reach onto private lands as well, and will lean on anyone they do not like. They don't like the 4x4 community as a whole. All they see is the redneck trash asses that trespass, and destroy property. It's an unfortunate stereotype that goes along with our sport.