How in depth does the plan need to be? Does it need an engineer's stamp? I don't know about where you are, but around here roll offs are brutal. Good luck getting them to drop off a 30, bring back a 10, swap, dump, and come back to get the 10 all before the end of the day. What about fill and grading? You have to rent machines? What is site access like? I think your a little low. That would go for $3,000 at least all day long around here. And that's using a triaxle for disposal.
My estimate:
Plot plan - RFI
Permit - $100 ($50 plus your time)
Concrete disposal - $300
Trash disposal - $300
20 yards of fill - $100
1 day Triaxle rental - $720
1 day Bobcat rental - $800
1 day Excavator rental - $800
Total - $3,120