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It. DATA REVIEW AND ANALYSIS The analysis is based upon the hydrogeologic information provided by Vector Engineering in a report to Kearny Ventures (Vector, 1993). According to the report, over most of the site the uppermost 1.5 to 2.5 feet of soil consists of gray sandy clay or brown clayey sand to clayey silt with relative low density. The uppermost horizon is underlain by 3.5 to 6.0 feet of brown sand. The third horizon is 3 to 4 feet thick and consist of brown sand and silty sand. The logs of the monitoring wells depict similar _ soils to those of the test pits. Below about 8 feet to the depth of the water, the soil consists of silty sand to sand, as described by the local well drillers. To confirm the conditions described by Vector, site conditions were discussed with Earth Systems Consultants, Inc., the geotechnical firm who performed the soils investigation for the Vector study. They described the site as uniformly distributed medium to fine clear sand with < 15% silt after a few feet of clayey topsoil. The single layered unconfined aquifer is considered 50 feet thick with a bottom elevation of -50± feet. According to the Vector's preliminary investigations the current groundwater level in the area of the proposed ponds ranges from 14 to 16 feet below the existing ground surface with elevation in the -1.0 to -3.0 feet range. Also, Kier & Wright, Inc measurements of groundwater elevation in monitoring wells located at the site (Figure 1) showed groundwater below mean sea level along the east side of the pond area and above mean sea level near the San Joaquin River during 1992 (Table 1). Therefore, to represent the existing conditions, the water elevation is assumed -2.0 feet throughout the domain except in the cells near Oakwood Lake. To depict existing lake conditions, an elevation of -14.0 feet is used and remains fixed during transient simulations. Oakwood Lake Resort maintains the lake at this elevation by pumping to the San Joaquin River. APRIL 1994 CCI'/SIMULATION OF PERCOLATION POND PERFORMANCE PAGE 2