More septic info, in case you haven't had enough

Picture all these fields in a sand mound 4' above the ground.

I placed a couple of calls to some engineers I know through work, no luck. Then it dawned on me that I know the town engineer from next door, so I've left him a mesage.

After that I called a friend at the town hall that knows everyone. He told me to stop over because there are 3 engineers! I hope to find out if it is worth paying an engineer for the septic design instead of the almost free county one.

Now, you are asking, well, why pay for an engineer when the county does it all (perc/layout/inspection), for one price? Because the county quite possibly over designs, whereas a qualified engineer may have better and more affordable ways to design the system.
For example, the county only will do a mound system with me. Well, there are a lot of other kinds, like wetland or marsh systems. Whether it is appropriate for this location considering the amount of shale, I don't know. It is worth a phone call, though.