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. ========================================+=============+=================
========================================+============================== | FOR 1,095 PIPES 55.9 CM. | IN DIAMETER. Materials. +-------------+---------------- | Quantities. | Cost. ----------------------------------------+-------------+---------------- Portland cement, at 8.00 pesos per | | bbl., delivered at pipe-making yard. | 303 bbl. | 2,424.00 pesos. Sand, at 2.65 pesos per cu. m. | 68 cu. m.| 180.20 " Crushed rock, 19-mm. (3/4-in.), at 2.65 | | pesos per cu. m. | 50 cu. m.| 132.15 " No. 6 galvanized-wire hoops. 4 rings | | to each pipe. | 4,380 | 183.00 " ----------------------------------------+-------------+---------------- Totals. | ... | 2,919.45 pesos. ----------------------------------------+-------------+---------------- Cost per pipe. | ... | 2.66 pesos. ========================================+=============+================
_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."