TABLE 6.—Cost of 55.9-Cm. Concrete Pipes.
| Labor For 9 Days. | ||
| Tampers, 2 at 4 pesos. | 72.00 | Pesos. |
| Cement mixers (hand-mixing) and helpers, 6 at 1 peso. | 54.00 | " |
| Water boy. | 4.50 | " |
| Proportion of time of crusher foreman, one-third of 6 pesos, 2 pesos. | 18.00 | " |
| Making 1,672 wire hoops, at 5 pesos per thousand. | 8.36 | " |
| Man coating pipe, at 1 peso per day. | 5.00 | " |
| ——— | ||
| Cost of labor making 418 pipes. | 161.86 | Pesos. |
| Cost of labor per pipe. | 0.38 | Peso. |
| Material. | ||
| Cement, 1181⁄2 bbl., at 6.40 pesos per bbl., at pipe-making yard. | 758.40 | Pesos. |
| Sand, 24.6 cu. m., at 2.50 pesos per cu. m. | 61.50 | " |
| Rock, 21.6 cu. m., at 2.00 pesos per cu. m. | 43.20 | " |
| No. 6 wire, 3,362 lin. m. | 55.56 | " |
| Lime. | 1.50 | " |
| ——— | ||
| Cost of material for 418 pipes. | 920.16 | Pesos. |
| Cost of material per pipe. | 2.20 | " |
| Add cost of labor. | 0.38 | " |
| Total cost per pipe for labor and material. | 2.58 | Pesos. |
| Equivalent to 4.23 pesos per lin. m., or 1.29 pesos per lin. ft. |
Excavation for Pipe Line and Siphons.—The excavation for the pipe line and for bridge works, etc., was let by contract to Messrs. Scott and Lee, of Monterrey, under three classifications:
(1) "All material which in the judgment of the Engineer can be economically loosened with picks and handled with shovels."
(2) "Indurated earth or gravel, shale or rock which can be loosened without blasting, and 'sillar', locally so-called, whether pure or mixed with other substances, and whether it requires blasting or not."
(3) "All rock not included in the above which requires drilling or blasting."
Locally, this classification is well understood, particularly No. 2, as it covers the sillar soils which are common in the neighborhood of
Monterrey. The contract prices were: No. 1, 50 cents; No. 2, 1.50 pesos; and No. 3, 2.50 pesos per cu. m. These prices were over and above the clearing and grubbing of the line, which was paid for at the rate of 100 pesos per hectare.
The route of the pipe line being along broken country, at some points difficult of access, service roadways, about 3 m. wide, for hauling material were constructed, and, for about 7 km., a roadway was made along the line of the trench.
The prices for the roadway, under the above classification, were: For No. 1, 35 cents; No. 2, 1.50 pesos; and No. 3, 2.50 pesos per cu. m.