The cost of cement included hauling from the bodega to the yard, a distance of about 5 km. At a later date, after the Company had commenced using the "Hidalgo" cement, some additional 55.9-cm. pipes were manufactured, so as to have them on hand as a reserve in case of emergency. In this work only Mexican labor was used, as the previous gang had been dispersed, but the tampers had previous experience. Taking the cost of 418 pipes made during one period of 9 days, the detailed cost was as given in Table 6. TABLE 6.--COST OF 55.9-CM. CONCRETE PIPES. ========================================+=============================== | FOR 1,126 PIPES 63.5 CM. | IN DIAMETER. Materials. +-------------+----------------- | Quantities. | Cost. ----------------------------------------+-------------+----------------- Portland cement, at 8.00 pesos per | | bbl., delivered at pipe-making yard. | 401 bbl. | 3,208.00 pesos. Sand, at 2.65 pesos per cu. m. | 85 cu. m.| 225.25 " Crushed rock, 19-mm. (3/4-in.), at 2.65 | | pesos per cu. m. | 62 cu. m.| 164.30 " No. 6 galvanized-wire hoops. 4 rings | | to each pipe. | 4,504 | 203.00 " ----------------------------------------+-------------+----------------- Totals. | ... | 3,800.55 pesos. ----------------------------------------+-------------+----------------- Cost per pipe. | ... | 3.37 pesos. ========================================+=============+=================