Pre-cast concrete is simply concrete that has been mixed

 Pre-cast concrete is simply concrete that has been mixed, formed and vibrated in a very controlled "plant" type environment and then delivered or trucked to its final destination and installed. Your first step is to locate a pre-cast concrete product dealer. This "spec sheet" will tell you how much digging needs to be done and what size doorway your concrete cutter needs to cut in the foundation. A standard pre-cast bulkhead will generally cost less than $1000 and this includes the steel bulkhead cover and installation.I recommend calling each of your sub-contractors a day prior to their arrival just to verify that there are no scheduling conflicts.  A pre-cast concrete dealer can be located in your local phonebook, or better yet, your online yellow pages. Ask them how much they charge and when they can schedule your job. So you can now schedule your bulkhead delivery and installation for about 12 noon.As soon as your bulkhead and metal bulkhead cover have been successfully installed you will need to "back fill" or replace the dirt that was removed from the hole. You can dig it by hand with a pick and shovel (not recommended), you can rent a small excavator (cost about $300) from a tool rental outfit and use the machine to dig it out or you can call a professional excavation contractor and have them dig it out for you (cost between $300 and $500).  You need to choose the size and style that is right for your project.