Obispado Reservoir: 375,000 pesos, or 9,375 pesos[7] per million liters.
[7] Mexican currency.
These rates may be regarded as reasonable when taking into consideration the special difficulties of construction in Mexico, and the high cost of all imported material, on which heavy duties are levied.
The value of the materials alone in these reservoirs amounted to more than 70% of their total cost.
Analyses of Estanzuela and San Geronimo Waters.
Table 8 shows analyses of the Estanzuela and San Geronimo waters, made in February, 1910, by Messrs. Ledoux, of New York City. The Estanzuela sample was taken at the valve-house of the South Reservoir, while that of San Geronimo was taken in Shaft No. 1 of the infiltration gallery when flowing at the rate of about 450 liters per sec. Both waters are absolutely free from turbidity.
TABLE 8.—Analyses of Estanzuela and San Geronimo Waters.
In Parts per Million.
| Estanzuela. | San Geronimo Infiltration Gallery. | |
| Total solid matter in solution | 209.00 | 305.00 |
| Organic and volatile matter | Not weighable. | Not weighable. |
| Analysis of Solids: | ||
| Silica | 10.5 | 12.0 |
| Iron and Alumina | Traces. | Traces. |
| Lime | 85.4 | 112.6 |
| Magnesia | 3.8 | 22.6 |
| Soda (Na2O) | 13.3 | 20.2 |
| Potash (K2O) | 2.0 | 1.9 |
| Sulphuric Acid | 24.4 | 11.5 |
| Chlorine | 2.0 | 2.8 |
| Probable Combination of Bases & Acid Radicals in the Solids: | ||
| Silica | 10.5 | 12.0 |
| Iron and Alumina | Traces. | Traces. |
| Sodium Chloride | 3.3 | 4.6 |
| Potassium Sulphate | 3.7 | 3.5 |
| Sodium Sulphate | 26.3 | 40.8 |
| Calcium Sulphate | 13.3 | 22.1 |
| Calcium Carbonate | 142.7 | 184.8 |
| Magnesium Carbonate | 8.4 | 49.8 |
| —— | —— | |
| 208.2 | 317.6 | |
| Nitrogen as Free Ammonia | 0.004 | 0.032 |
| Nitrogen as Albuminoid Ammonia | 0.006 | 0.022 |
| Nitrogen as Nitrites (N2O3) | 0.002 | 0.002 |
| Nitrogen as Nitrates (N2O3) | 0.100 | 1.85 |
| Total Hardness (as CaCO3) | 155.0 | 220.0 |
| Alkalinity (as CaCO3) | 121.0 | 180.0 |