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