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CHAPTER IV <br /> PROBLEM AREAS <br /> This chapter contains discussions of the water <br /> quality, hydrologic and geologic parameters for particular <br /> areas of the County in which problems did or may develop . <br /> Stockton Area <br /> Stockton is the pivotal area of San Joaquin <br /> County, so the protection of its water supply is of paramount <br /> economic importance to all county residents . Historically , <br /> the Stockton area has had an abundant supply of good quality <br /> ground water. However, there is clearly a present danger <br /> that this supply is being slowly encroached upon by the <br /> poor quality waters underlying the Delta. <br /> Previous studies (11) have indicated that a <br /> "barrier effect" exists between the poor quality chloride <br /> waters on the west and the good quality waters flowing into <br /> the Stockton area from Sierran sources to the east . Results <br /> of the present investigative program indicate that no such <br /> barrier exists ; that , in fact , poor quality waters are <br /> migrating into the Stockton area from the west at a rate <br /> governed by the laws of fluid mechanics , the constant <br /> geologic parameters , and the variable current hydraulic <br /> parameters by which ground water is controlled. There are <br /> no lithologic , structural, or apparent consistent hydraulic <br /> -109- <br />