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A18 <br />123 C <br />REGIONAL AQUIFER-SYSTEM ANALYSIS-CENTRAL VALLEY, CALIFORNIA <br />122° 121° 120° 119°118 C <br />40° <br />39° <br />38° <br />37 C <br />36 C <br />35 C <br />EXPLANATION <br /> 120 WATER-TABLE CONTOUR - Shows altitude, in feet. <br />Contour interval, 40 and 100 feet. Datum is <br />sea level <br />FIGURE 11. Estimated predevelopment water table (modified from Williamson and others, 1989).