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A38 REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />123 C 122 C 12V 120 C 119 C 118 C <br />40° <br />39' <br />I I <br />EXPLANATION <br />WATER TYPES <br />Magnesium bicarbonate <br />Calcium bicarbonate <br />Sodium bicarbonate <br />Magnesium sodium bicarbonate or <br />sodium magnesium bicarbonate <br />Calcium magnesium bicarbonate or <br />magnesium calcium bicarbonate <br />Sodium calcium bicarbonate or <br />calcium sodium bicarbonate <br />Calcium, magnesium, sodium, chloride, <br />sulfate, and bicarbonate may occur <br />in any combination <br />Sodium or calcium, chloride or sulfate are <br />most common in various combinations <br />No data <br />38' <br />37' <br />36 C <br />35° - <br />c <br />50 100 MILES <br />50 100 KILOMETERS <br />FIGURE 25. Chemical types of ground water in the Central Valley. <br />[Chemical types shown are approximated from maps and descrip- <br />tions in the following reports: Davis and Poland, 1957; Wood and <br />Davis, 1959; Wood and Dale, 1964; Dale and others, 1966; Croft and <br />Gordon, 1968; Page and LeBlanc, 1969; Bertoldi, 1971; Hotchkiss <br />and Balding, 1971; Page and Balding, 1973; Sorenson, 1981; <br />Fogelman, 1983; Evenson, 1985; Johnson, 1985.]