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r-, <br /> The total Yearly Average Cost of $51,939.31 includes power charges which are <br /> necessary to pump flows both before and after development of the upland basin. The Hillside <br /> Basin is responsible for 56% of this total yearly average cost or $29,086.01. Since the CITY <br /> is responsible for 23% of Hillside Basin flows and sediment loads, the CITY is responsible for <br /> 23% of this figure or $6,689.78. (Another way of expressing this same calculation is to <br /> multiply the Hillside Basin current total runoff of 56% by the CITY's 23% share to arrive at the <br /> CITY's share of total yearly average cost as 12.88% resulting in a figure of $6,689.78.) <br /> 3. Pump Plant Maintenance Costs <br /> For the past five years, pump plant maintenance costs have been as follows: <br /> Year Cost Running Total Yearly Average Cost <br /> a. 2003 12,839.15 12,839.15 <br /> b. 2002 40,760.01 53,599.16 <br /> c. 2001 9,081.01 62,680.17 <br /> d. 2000 15,884.77 78,564.94 <br /> e. 1999 11,647.37 90,212.31 - 5 = $ 15,797.54 <br /> The total yearly average cost of$18,042.46 includes maintenance for pumping flows both <br /> before and after development of the upland. The Hillside Basin is responsible for 56% of the <br /> total cost of runoff or $10,103.78. Since the CITY is responsible for 23% of Hillside Basin <br /> flows, the CITY is responsible for 23% of this figure or$2,323.87. (Another way of expressing <br /> this same calculation is to multiply the Hillside Basin current total runoff proportion of 56% by <br /> the CITY's 23% share to arrive at the CITY's share of total yearly average cost as 12.88%, <br /> resulting in a figure of $2,323.87.) <br /> 4. Pump Plant Replacement Costs <br /> Marshland pumping facilities have aged and a replacement program has been <br /> implemented. Aqua Terra's study for the COUNTY indicates that all six pumps are in need of <br /> replacement, at a current cost of about $50,000 per pump which may be accomplished over a <br /> six year period during which period costs can be expected to increase. Replacement of aging <br /> pumps is necessary because of pumping flows both before and after development of the upland. <br /> The Hillside Basin is responsible for 56% of the total runoff and, therefore, 56% of replacement <br /> cost. Since the CITY is responsible for 23% of Hillside Basin flows, the CITY is responsible <br /> for 23% of this 56% figure or 12.88%. An amortization table for a replacement calculation is <br /> set forth below. <br /> APPENDIX TO INTERGOVERNMENTAL AGREEMENT FOR <br /> ACCOMMODATING SURFACE WATER IN THE MARSHLAND <br /> FLOOD CONTROL DISTRICT BY AND BETWEEN THE CITY OF <br /> EVERETT AND MARSHLAND FLOOD CONTROL DISTRICT-PAGE 4 <br />