254 GEOLOGICAL RECONNAISSANCE OF THE DOMINICAN REPUBLIC. 



Mineral analysis and classification of water from Rio de los Cocos, Campo Arenoso 

 Samand, Samand Peninsula, Samand Province. 



[Sample collected by C. P. Ross June 25, 1919. Analyst, M. D. Foster.] 



Constituents. Parts per million. 



Silica (SiOi) 17 



Iron (Fe) 1 . i 



Calcium (Ca) 64 



Magnesium (Mg) 6.0 



Sodium and potassium (Na+K), calculated 8 . 9 



Carbonate radicle (C0 3 ) .0 



Bicarbonate radicle (HC0 3 ) 214 



Sulphate radicle (S0 4 ) 6.7 



Chloride radicle (CI) 15 



Nitrate radicle (N0 3 ) Trace. 



Organic matter 4.2 



Total dissolved solids 242 



Classification. 



Quality for boiler use Poor. 



Quality for domestic use Good. 



Quality foi irrigation Good. 



Chemical character CaC0 3 . 



Mineral content Moderate. 



Mineral analysis and classification of water of Rio San Juan at mouth of Arroyo Santa 



Maria Luisa, Samand Peninsula, Samand Province. 



[Sample collected by C. P. Ross June 24, 1919. Analyst, M. D. Foster.] 



Constituents. Parts per million. 



Silica (Si0 2 ) 39 



lion (Fe) .42 



Calcium (Ca) 58 



Magnesium (Mg) 11 



Sodium and potassium (Na+K), calculated 13 



Carbonate radicle (C0 3 ) .0 



Bicarbonate radicle (HC0 3 ) 224 



Sulphate radicle (S0 4 ) 9.0 



Chloride radicle (Cl) 16 



Nitrate radicle (N0 3 ) 2.3 



Oiganic matter 3 . 6 



Total dissolved sclids 264 



Classification. 



Quality for boiler use Poor. 



Quality for domestic use Good. 



Quality for irrigation Good. 



Chemical character CaC0 3 . 



Mineral content Moderate. 



At many places in the Ciboa Valley ground water could be used to a much 

 greater extent than it is now. In this valley very few wells are in use, but 

 water can be obtained at moderate depths nearly everywhere in it. The 

 outwash deposits from the mountains on both sides of the valley contain 

 gravel beds which should be excellent reservoirs for ground water. The 

 outwash deposits on the north slope of the Cordillera Septentrional have in 

 places a distinct slope valleyward. Suitable locations for artesian wells 

 might possibly be found here. In the vicinity of Azua there are artesian 

 wells of considerable flow. 



