The regular carpenter gang consisted of a foreman carpenter at $5 per day, a carpenter at $3.50 per day, and two helpers at $2.75 per day. During the early concrete work of making footings and floor, where forms were not required, the carpenter force was employed in erecting the steel skeleton for the walls. The upright bars were placed in position and secured by temporary wooden stays extending from the upper portion of bars to the surface of ground outside of excavation. These stays were removed after concreting had advanced to a sufficient height to hold the steel securely in place.
The wages paid the concrete gang which mixed and placed all the concrete and the carpenter gang which constructed and erected the forms and placed the reinforcement have been given above. The costs of construction materials on the site were:
| Cement, per barrel | $2.57 |
| Sand, per cu. yd. | 1.80 |
| Stone, per cu. yd. | 3.15 |
| Lumber, per M. ft. B. M. | 27.50 |
The quantities in the completed concrete structure were as follows:
| Total volume of concrete in reservoir | 704.71 cu. yds. |
| Total volume of steel reinforcement in reservoir. | 5.57 cu. yds. |
| —————— | |
| Total volume of material in completed structure. | 710.28 cu. yds. |
| The steel was, therefore, about 0.8%. | |
| Volume of material in structure exclusive of roof slab | 648.35 cu. yds. |
| Volume of material in roof slab | 61.93 cu. yds. |
| —————— | |
| Total | 710.28 cu. yds. |
The cost of the structure per cubic yard of concrete, exclusive of the roof slab, was as follows:
| Item. | Per cu. yd. |
| Crushed stone | $ 3.168 |
| Sand | .842 |
| Cement | 3.859 |
| Reinforcement | 4.959 |
| Labor, mixing and placing concrete | 1.721 |
| Forms, labor and material | 2.960 |
| ——— | |
| Total | $17.509 |
In constructing the roof slab the expanded metal reinforcement raised the unit cost. For this portion of the work the costs were:
| Item. | Per cu. yd. |
| Expanded metal reinforcement | $ 5.241 |
| Other items, same as above | 12.550 |
| ——— | |
| Total | $17.791 |
The floor and the inside surface of reservoir walls were covered with a coating of cement mortar composed of one part Portland cement and one part sand. The wall plastering was from ½ in. to ¾ in. thick; it was applied in two coats. The floor finish was laid in alternate strips about 1 in. thick and 3 ft. wide. After the strips first laid had hardened the remaining strips were laid, the edges being grouted to ensure tight joints.