Septic fields, am I being ripped off?

Hey
Sounds way, way too high. I would double-check with municipality and you may have other option such as employing a backhoe operator to do the excavating and another contractor to do the "plumbing". Once set up and barring any discoveries like additional rock, blasting, etc.... you can be the boss and save the profit margin.

I would boot them off my property just for being rude to one of the homeowners and report them to BBB and tell all my neighbors and, and, and...

Pete