Not sure on most of these. Please go on YouTube and search for how to perc test land. There are lots of off grid build types making very informative videos on this subject. They teach you how to dig a hole about the size of a 5 gallon bucket. Then pour water in the hole and time how long it takes to soak in. Depending on local codes the depth of the hole and the diameter of the hole are dictated. The volume of water is dictated too. Then there is a local guideline about if it takes longer than the allotted time to drain then the land does not perk. These land deals are very do it yourself. You can go perc test any of my land before you buy it. Watch the YouTube videos on how to do it. Then you can feel a lot more comfortable about installing a septic system before buying land.