Cost of Works.
Reading edition
Table 16 gives the main items of the approximate expenditure. These include all expenses for preliminary location, engineering, superintendence, purchase of lands, water rights, etc., but do not include other heavy expenditures chargeable to the concession, such, for example, as general expenses, interest at the rate of 6% during the construction period, preliminary expenses for investigations, etc., items which would increase the total by nearly 25 per cent.
TABLE 16.—Principal Items of Expenditure.
Pesos, Mexican currency.
Estanzuela Supply:
Aqueduct and dam502,000
South Reservoir429,000
———931,000
San Geronimo Gravity Supply:
Aqueduct, tunnel, and infiltration gallery223,000
Obispado Reservoir436,000
———659,000
San Geronimo Provisional Supply,
including boring operations, etc.130,000
City Water Distribution System1,195,700
City Sewer System1,036,000
Outfall:
Main outfall sewer425,000
Sewage purification works75,000
———500,000
—————
Total 4,451,700
As a general statement, the actual cost of labor is about 331⁄3% of the total cost of the construction work, including materials. Fig. 20 shows in graphic form the amount of the labor pay-rolls and the progress of the work during the whole construction period from 1906 to 1909, inclusive, comprising also that done under contract.
Fig. 20.—Progress diagram showing monthly labor pay-rolls during the construction period.
