Anyone know an easy formula for bidding on cutting a trench in a slab. I am working a job and they asked me to cut a trench for plumbers. And to let them know what they owe me. I always try to be fair and competitive but I have not ever cut a trench like this. It is 6" concrete that is going to be cut one time 144' long. It is up against the back of a building and will be a 3' trench and I will have to breakup and haul off. Any advice would help Thanks.