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TABLE 1 GROUNDWATER ELEVATION (ft.) AT CROSSROADS COMMERCIAL/INDUSTRIAL PARK DURING 1992-1993, FROM KIER & WRIGHT, INC. MONITORING WELL 4-7-92 5-23-92 6-8-92 6-23-92 7-6-92 7-3092 10-16-92 1-20-93 3-9-93 MW-J -2.5 -2.8 1 -2.8 1 -2.9 -3.0 -2.9 -3.1 -2.3 -1.3 _ MW-K -6.9 -7.1 -6.8 -6.8 -6.8 -6.5 -6.8 -5.9 MW-L 1.5 2.0 1.9 1.5 1.6 2.1 2.1 5.9 3.0 MW_M __ MW_N MONITORING WELL 3-30-93 4-27-93 6-10-93 9-24-93 10-20-93 11-10-93 12-8-93 MW-J -0.8 -1.2 -1.38 -1.4 0.1 1.1 1.6 MW-K -5.6 -5.5 -4.9 22.7 0 -4.6 -4.1 -3.6 MW-L 3.5 3.6 3.03 3.3 2.3 1.6 MW-M -0.9 0.20.67 9 0.3 O -0.4 MW-N -1.5 0.6 .20 0 0.5 0.8 1.30 The recharge rate at the water surface due to pond operation is calculated based upon the pond loading rate of 600,000 gallons per day (gpd). The 600,000 gpd loading rate will be discharged in the percolation ponds in Phase III, ultimate buildout. The actual annual loading, even with a 100 year return period precipitation, will be less than the 600,000 gpd, since evaporation from the pond surface easily exceeds the rainfall caught in the ponds. For this analysis, only the maximum loading condition is examined. The infiltration rate required to percolate 600,000 gpd over 23 acres as calculated by Vector Engineering is approximately 31 feet/year (9.83 * 10-7 cm/sec). This recharge rate is assumed to occur continuously and uniformly to the water table from the total pond area regardless of the pond operation cycle as contrasted to Vector's approach. This assumption reduces the model's complexity without a significant loss in the accuracy of the results. APRIL 1994 CCIPISIMULATION OF PERCOLATION POND PERFORMANCE PAGE 3