Well, he's 3000 LF, x 10 ft wide, that gives you 660-680 tons of material, and at his quoted prices, that's $12,500 in just rock; then I figured 40 total operator hours, machine price, mobilization, ect. Maybe a bid price could get down to $25,000 at the absolute lowest, and that wouldn't include pipe. Any contractor who is going to bring out something in the D5 size dozer is going to need mobilzation built into his price. Profit; frankly, 18.75% on top of material and labor is fair. If you want to get technical, depending on how the rock mine writes their bills, you could have sales tax (7% locally) on top of that $12,500.
Honestly, if you can get 4" of roadbase hauled, placed, finished and rolled, 1000lf long,x10ft wide, for $7500; that's an amazing deal.
As an example;
@Lineman North Florida not asking for a bid; but what sounds reasonable for a 3000 lf drive, 10 ft wide, haul, place and finish, 4" of limerock roadbase, including mobilization? I'm thinking $10/sy at the extreme low end; but probably closer to $12.50/sy or maybe more?