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4.3• Water Usage Rates The City's water usage rates consist of five components: Zone 7 Supply,Base, Peaking, and Recycled Water Surcharge. The recycled water usage rate is solely made up of the recycled water cost component.The following sections will present the calculations for each of the components. 4.3.1.PEAKING COMPONENT Error! Reference source not found. shows the Peaking unit cost calculation for each customer class and tier. P eaking costs(Column B)are the sum of Max Day and Max Hour costs for each class and tier(Table 3-18, Columns F and G).Peaking costs are divided by annual use(Column C)to determine the Peaking unit cost for each class and tier(Column D). Table 4-3: Peaking Unit Cost Calculation T ine Customer Class Peaking Costs Annual Use(ccf) Peaking Unit Cost 1 Single Family Residential 2 Tier 1 999,092 1,642,987 0.61 3 Tier 2 930,110 610,595 1.52 4 Tier 3 574,175 279,195 2.06 5 Tier 4 1,103,591 480,174 2.30 6 Multi-Family Residential 302,153 527,984 0.57 7 Commercial 323,588 456,989 0.71 8 Industrial 11,956 16,886 0.71 9 Irrigation 1,561,861 1,017,153 1.54 4.3.2.RECYCLED WATER SURCHARGE Table 4-4 shows the Recycled Water Surcharge unit cost calculation.The surcharge is charged to Single Family Residential Tier 4 usage and all other customer classes. The surcharge costs(Column B)are divided by the annual use(Column D)to derive the unit cost(Column E). Table 4-4: Recycled Water Surcharge Unit Cost Calculation Line Customer Class RW Surcharge Applied Annual Use(ccf) RW Surcharge Usage Unit Cost 1 Single Family Residential 29,938 480,174 0.06 2 Tier 1 0% 1,642,987 0.00 3 Tier 2 0% 610,595 0.00 4 Tier 3 0% 279,195 0.00 5 Tier 4 100% 480,174 0.06 6 Multi-Family Residential 5,246 527,984 0.01 7 Commercial 4,541 456,989 0.01 8 Industrial 168 16,886 0.01 9 Irrigation 10,107 1,017,153 0.01 4.3.3.ZONE 7 VARIABLE COSTS Table 4-5 shows the unit cost calculation for each customer class for the Zone 7 variable cost component. Zone 7 use(Column C)is equal to Annual Use(Column B). Zone 7 costs are divided into each customer class by their WATER AND RECYCLED WATER RATE STUDY REPORT 51