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uniform continuous recharge the groundwater mound will continue to grow until the <br /> .. lateral flow to the San Joaquin River provides a limit, i.e., equilibrium is reached. <br /> _ Numerous optimization and calibration model runs also showed that the groundwater <br /> mounds reaches equilibrium after about a year of the pond operation at the maximum <br /> loading rate. <br /> The groundwater levels in the area after 37 days and 365 days are shown in Figures 3 <br /> and 4. The results show that the mound elevation after 365 days reached a peak value <br /> of approximately 6.0 feet, i.e., 7.0 feet below the bottom of pond. Therefore, under <br /> existing hydrologic conditions, the groundwater mound will maintain the 5.0 feet <br /> separation distance from the bottom of the percolation ponds, and the ponds will <br /> perform adequately. These results are similar to Vector's calculations and <br /> determination. <br /> To model the extreme river condition after the steady state condition is reached, on day <br /> 366 the river elevation was increased to 15.0 feet (24 ft. depth). This represents the <br /> Soodosedithm "83. The total simulation time is 545 days. The river elevation is <br /> below the mound elevation during normal years; hence groundwater moves from the <br /> mound to the river (Figure 4). After the river reaches an elevation of about 8 feet, the <br /> flow direction is reversed and flow moves both away from the river and away from the <br /> mound (Figure 5). The impact of the increase of the river stage to 15 feet over the 6 <br /> month period is to raise the mound from elevation 6 to elevation 8. Once the river <br /> recedes below elevation 8, the river again becomes a "sink" and the mound will recede. <br /> The 5 foot separation from the bottom of the percolation ponds is maintained <br /> throughout the flood period. <br /> It is important to recognize that the Oakwood Lake is maintained at a constant level of <br /> -14.0 feet for recreational purposes. This creates a steep gradient which induces <br /> subsurface flow from the San Joaquin River towards the lake, a naturally occurring <br /> phenomenon, even without the percolation ponds in place. With the addition of the <br /> ` APRIL 1994 CCIP/SHAULATION OF PERCOLATION POND PERFORMANCE PAGE 6 <br />