Hello, I'm estimating a job that requires 1100 linear feet of 4x 2" duct bank with stacked conduit spacers every 5' , #4 rebar the full length , all four corners (1100' x 4) and a # 4 rebar square ring tied around the whole assembly every 7' . It is then to be encased in 3000 psi red concrete. The gc is doing the excavation and back fill. Any thoughts on cost per ft? or man hours . Thank you