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Crossroads Commercial/Industrial Park <br /> SIMULATION OF PERCOLATION PONDS PERFORMANCE <br /> UNDER VARYING HYDROLOGIC CONDITIONS <br /> 1. INTRODUCTION <br /> Kearny Ventures, Ltd. proposes to utilize a portion of its property located southeasterly <br /> of Interstate 5 and easterly and adjacent to the San Joaquin River for sewage treatment <br /> plant (STP) effluent disposal. The site is to be used for a layout of 5 effluent <br /> percolation ponds with a combined area of approximately 23 acres. A preliminary <br /> investigation of the site was performed by Vector Engineering, Inc. to determine the <br /> suitability of the site for the percolation ponds. The report concluded that the site <br /> could accommodate the percolation ponds if the pond bottoms were constructed at <br /> elevation 13.5 which would allow maintenance of a 5 foot separation from the <br /> groundwater mounding expected to develop from pond operation. <br /> One of the issues raised by the County of San Joaquin is the potential impact of the San <br /> Joaquin River flood stage on the performance of the ponds. This scenario was not <br /> analyzed by the Vector studies. On January 17, 1994, Stoddard & Associates submitted <br /> a proposal to assess the potential impact of rise in river stage on the performance of the <br /> ponds. In that proposal, Stoddard & Associates outlined a detailed hydrologic analysis <br /> of groundwater flow in the area by utilizing the numerical model, MODFLOW, <br /> developed by the United State Geological Survey. This report briefly summarizes the <br /> specific tasks performed during the analysis and present the results of the study to date. <br /> APRIL 1994 CCIP/SIMULATION OF PERCOLATION POND PERFORMANCE PAGE 1 <br />