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proportionate use of Zone 7 water. These Zone 7 costs by customer class(Column D)are then divided by the total annual water use by class(Column B)to derive the Zone 7 unit cost by customer class(Column E) Table 4-5: Zone 7 Variable Unit Cost Calculation by Class Annual Use Zone 7 Use Zone 7 Unit Line Customer Class (ccf) (Ccf) Zone 7 Costs Cost 1 Single Family Residential 2 Tier 1 1,642,987 1,642,987 $5,630,929 $3.43 3 Tier 2 610,595 610,595 $2,092,661 $3.43 4 Tier 3 279,195 279,195 $956,872 $3.43 Tier 480,174 480,174 $1,645,676 $3.43 6 Multi-Family Residential 527,984 527,984 $1,809,533 $3.43 7 Commercial 456,989 456,989 $1,566,216 $3.43 8 Industrial 16,886 16,886 $57,871 $3.43 9 Irrigation 1,017,153 1,017,153 $3,486,041 $3.43 10 Total 5,031,962 5,031,962 $17,245,800 4.3.4.RECYCLED WATER VARIABLE RATE Table 4-6 shows the calculation of the recycled water variable water usage rate. The fixed revenue(Column B, Line 2)is calculated by multiplying the recycled water meter bills per year with their corresponding fixed meter charge. The remaining revenue(Column B)to be collected through the variable rate is divided by the annual recycled water use(Column B,Line 4)to derive the recycled water variable rate(Column B,Line 5). 52 CITY OF PLEASANTON