+---------------------------------------------+--------------------+
| | Pesos, |
| | Mexican currency. |
+---------------------------------------------+--------------------+
| ESTANZUELA SUPPLY : | |
| Aqueduct and dam | 502,000 |
| South Reservoir | 429,000 |
| | ------- 931,000 |
| | |
| SAN GERONIMO GRAVITY SUPPLY : | |
| Aqueduct, tunnel, and infiltration gallery | 223,000 |
| Obispado Reservoir | 436,000 |
| | ------- 659,000 |
| | |
| SAN GERONIMO PROVISIONAL SUPPLY , | |
| including boring operations, etc. | 130,000 |
| | |
| CITY WATER DISTRIBUTION SYSTEM | 1,195,700 |
| | |
| CITY SEWER SYSTEM | 1,036,000 |
| | |
| OUTFALL : | |
| Main outfall sewer | 425,000 |
| Sewage purification works | 75,000 |
| | ------- 500,000 |
+---------------------------------------------+--------------------+
| Total 4,451,700 |
+---------------------------------------------+--------------------+
As a general statement, the actual cost of labor is about 33-1/3% 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.
[Illustration: FIG. 20.--PROGRESS DIAGRAM SHOWING MONTHLY LABOR PAY-ROLLS
DURING THE CONSTRUCTION PERIOD.]