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.. depletions will be made using the long.term averages since 1975. The CRDSS Colorado River Mainstem Water Right Planning Model will be used, and two model runs will be required. RUN I. The Cl scenario will be run for the updated study period (e.g., 1975 to year n, where year n would be 2005, 2010, 2015, etc.) at the 1995 level of demand for the entire study period. RUN 2. A second model run (call it C,) would be made for the same updated study period using year n demand levels over the entire period. Comparing the difference between the long. term averages of the two model runs (Cl & C,) will identifY the increase in depletions over that time period. Model calibration and verification will be done with each update. There are no "cap" amounts identified in this process; the trigger is whether or not the difference between the two model runs exceeds either the 60,000 acre. foot or the 120,000 acre.foot levels identified in this Biological Opinion. Also, the criteria to determine positive or negative fish population responses is presented in the reinitiation notice of this biological opinion and in Appendix D. As described in the reinitiation notice, the status of fish populations will be reviewed prior to new depletions reaching 60,000 acre-feet/year. This review will begin when actual new depletion levels reach 50,000 acre.feet/year or the year 2015, whichever comes first. Therefore, every 5 years it will be determined if new depletions are approaching 50,000 acre. feet/year. 4) A report will be prepared documenting the assumptions used and changes in depletions and other model results. The report will be prepared on a water year basis October I to September 30. The report will also document any changes made to the model such as updated demand information. 5) Reports will be provided on a five year basis. The report covering the period 2001.2005 will be completed by December 31, 2006. The report covering the period 2006-2010 will be completed by December 31, 20 II, The reason for the one year lag is to allow the data for the previous year to be reduced and finalized. 6) This process as currently envisioned has the potential to become labor intensive depending on the number of model changes and degree of "backcasting" involved. Costs or appropriate cost. share arrangements will be worked out during the development of the Recovery Program's annual work plan. A Scope of Work will be prepared for the FY 2005 Recovery Program's work planning process to fund the development of the depletion report and model runs, Furthermore, because of cost considerations, the process identified above is subject to change with the agreement of the Recovery Program's participants through the current management process.