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6 <br /> The flows also contribute to sediment being washed downhill and into MARSHLAND <br /> drainage facilities. The Associated Earth Sciences study indicates the increase in Hillside Basin <br /> flows has also increased overall sediment loading approximately 150% to 180% over what was <br /> experienced during pre-hillside development when the MARSHLAND facilities were designed <br /> and constructed. <br /> Thus, for example, there were about 2,132 tons per year of sediment in the pre-hillside <br /> development era. This has increased under development to about 5,650 tons per year, a boost <br /> of about 3,518 tons per year. The Hillside Basin is, therefore, contributing 62.3% of current <br /> sediment load (3,518 _ 5,650). The CITY and COUNTY shares of this percentage can be <br /> calculated by using the same 23% and 77%, respectively, figures for the CITY and COUNTY <br /> shares of the Hillside Basin. Thus, the CITY's share is 14.329% (.23 x .623 = .14329) and <br /> the COUNTY's 47.97% (.77 x .623 = .4797). <br /> These increased flows and loads affect MARSHLAND pond, ditch and canal acquisition, <br /> construction and maintenance costs, pump plant power costs, pump plant maintenance costs and <br /> pump plant replacement costs. By using the percentage of contribution the CITY and COUNTY <br /> constitute, the CITY and COUNTY shares of these costs can be calculated. The results of these <br /> calculations may then serve as a basis for negotiating interlocal agreement payments for the <br /> present and future. The methodology can also be used to analyze future studies which document <br /> changes in the flows and loads. <br /> There are at least two final components. Flows and loads vary year to year. Indeed, <br /> both the Aqua Terra and Associated F2rth Sciences studies are based upon averages over a five <br /> plus (5+) year period. In order to keep data as current and relevant as possible, even without <br /> annual studies by consultants such as Aqua Terra and Associated Earth Sciences, it is prudent <br /> to use "rolling" or "moving" cost averages and/or cost of living increases. <br /> On the basis of all the above, the parties agree that Interlocal Agreement payments should <br /> be negotiated as the sum-of several components. Those components are: <br /> 1. Pond, ditch and canal acquisition, construction and maintenance costs; <br /> 2. Pump plant power costs; <br /> 3. Pump plant maintenance costs; <br /> 4. Pump plant replacement costs; and <br /> 5. Rolling/moving 5 year cost averages. <br /> This Interlocal Agreement has been negotiated based upon the following information <br /> relating to each of these components: <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 2 <br /> L8 <br />