Laserfiche WebLink
AZ <br /> discontinuities which would stop the incursion of water in <br /> an easterly direction from the Delta. <br /> ' The problem of poor quality water encroachment <br /> ' has been developing in Stockton for some time but it has <br /> been most noticeable in the last several years as shown on <br /> ' figures and plates included in this report .fig p � <br /> One of the ways to trace the movement of water, <br /> ' both with respect to direction and apparent velocity , is by <br /> observing the course and amount of decrease or increase of <br /> chloride ion concentration, with time , in a well network. <br /> In the Stockton area, a number of wells are present on which <br /> excellent long-term chemical data are available . By charting <br /> the chloride content of critical wells against time and <br /> ' against distance from a base line (here chosen as the 300 X <br /> parts per million chloride quality line for 1953) an indication] <br /> of chloride increase is obtained. Analyses of data from these : � <br /> wells indicate that poor quality chloride waters are locally <br /> moving into the Stockton area at a lateral rate of 140 to t <br /> F <br /> ' 150 feet per year. Figure 17 illustrates the approximate <br /> position of the 300 parts per million chloride line in 1953 i <br /> and in 1963 . Fair agreement was obtained by checking the <br /> flow rate by use of the Darcy flow equation. <br /> It is interesting to note on Figure 17 that the <br /> ' greatest separation between the time-chloride lines is in - <br /> the area of the deep water channel , and that expansion <br /> ' is apparently in a direction north of east rather than <br /> _110- <br /> ' t <br />