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basin and reduces the net water use to something less than the amount that i summarized in Table 2. s pumped by the well Since the amount that recharges the groundwater a monitonn Program cane of be accurately quantified without g P gram of measuring water loss in the Percolation pond and adjusting for evaporation, it is assumed for the purposes of this stud Table 2, represents the net water use b the quarry Y that the water produced, as shown in Y q rry operation. Based on a linear relationship between the water demand an � d aggregate production, it is Projected that the groundwater extraction will increase from 217 acre feet feet annually. The projection assumes that production will be limited to 2 73 wally to 1,119 acre maximum production allowed in the air resources permit. � 6 tons per day, the , figures to the other components of water use field P t' Applying typical consumptive use yields the estimate of current demand of 2,339 acre feet, or 2.67 ac. ft./yr. as shown in Table 3. Table 3 Estimated Current Total Water Demand r AREA WATER USE LAND USE Acres Ac. Ft.lYr. Mined Area 12 217 Almonds 337 1,122 i Tota! 1,339 ' 2.67 Ac. Ft./Ac As part of the mining application, a reclamation plan is proposed as shown in Figure 4. Presented on the figure is the expected post-project land use: grazing, 32 acres; row crops on bottom lands, 69 acres; transition slopes, 298 acres; and orchard, 70 acres. Of these land uses, the row crop land, trees, and the transition slopes (if planted to some type of permanent crop) will require irrigation. Assuming an average consumptive use of these acres of 3 acre feet per acre, the reclaimed water demand is estimated at 1,311 acre feet per acre annually. STODDARD&ASSOCIATES Assessment of Water Supply Impacts AUGUST 1995 -0-PAGE 6