The cost of labor for the floor was:
| Foreman | $0.28 |
| Preparing for mixing | 0.08 |
| Cleaning out forms | 0.05 |
| Handling materials | 0.14 |
| Handling and placing steel | 0.08 |
| Mixing and placing | 0.87 |
| Ramming | 0.36 |
| —— | |
| $1.86 |
This gives a total cost per cubic yard for the concrete in the girders in the completed bridge as follows:
| Materials | $ 7.01 |
| Erecting forms | 4.73 |
| Tearing down forms | 0.61 |
| Labor | 2.57 |
| General expense | 1.60 |
| ——— | |
| $16.52 |
The cost per cubic yard for the floor was:
| Materials | $ 6.13 |
| Erecting forms | 4.73 |
| Tearing down forms | 0.61 |
| Labor | 1.86 |
| General expense | 1.60 |
| ——— | |
| $14.93 |
Included with this is an item for general expense, being expenses of the contractor in bidding on the work, car fare, and other items of expense in looking after the contract.
It will be noticed that a record is here given of three different mixtures and that the labor cost of mixing and placing increases with the richness of the mixture. This is because it takes a greater number of batches to the cubic yard. Record has also been given of cost of preparing the mixing board and other work necessary to start and clean up each day; also when stock piles could not be arranged close to the mixing board, of the cost of handling the materials. These items, it will be noticed, are large enough to be considered in estimating on new work. The cost of sweeping and cleaning out the forms has also been listed, as this work is extremely important.
The cost of the reinforcing steel is given in with the materials, but the labor of handling it and placing it in the forms is listed under labor. This naturally varies with the amount of steel needed, and with the Kahn bar it will vary from 10 cts. to 75 cts. per cubic yard, as the prongs of the bar must be bent into proper position and at times straightened, when bent in shipment. This cost seems large, but it is done with the ordinary labor, while with round rods a large amount of blacksmith work has to be done and a smith and his helper frequently must place them. The patent bars are all lettered and numbered as structural steel is, and can be placed under the direction of the foreman.