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-RNJ <br />• Working To Restore Nature <br /> Evaluation of Groundwater Gradient <br /> The elevation of the top of each well casing was measured by RESNA using well MW-4 as the <br /> datum point. The U.S.G S. Quadrangle Map, Stockton West, California 1976, was used to <br /> evaluate the elevation of the ground surface around well MW-4. The tops of the monitoring <br /> and recovery wells were surveyed relative to mean sea level on September 9, 1992. The <br /> elevation of the well casing and the depth to groundwater measured in each monitoring well <br /> were combined to evaluate the relative elevation of the groundwater surface in each well and <br /> the slope of the groundwater surface across the site. <br /> 98009-1013QSR94 doe <br />