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r project cost to derive the remaining joint cost. The remaining joint cost i8 then allocated among the project purposes in proportion to the residuals derived by subtracting the separable cost of each purpose from the justi- fiable expentiture for each purpose. A 2-1/2% interest rate was used for figuring interest during construction and weighting costs and benefits according to time of occurrence. A time period of 100 years was used which 11 is the estimated economic life of the facilities. - The construction of specific recreation and fish and wildlife facilities by the Department of the Interior in connection with the storage units is funded using money provided to the Department under Section 8 of the authorizing act. The act makes the cost of these facilities, including the cost of their operation and maintenance, assignable directly to the recre- ation and fish and wildlife pur~oses and non-reimbursable. Accordingly, the costs are not allocated along with the cost of the reservoirs, power- plants and other basic facilities, and, except by specific reference, are not included in the discussion of costs in this report. They are shown in Table 2. Since 1967 when the storage project facilities -- except some specific power, recreation and fish and wildlife facilities -- were essentially constructed, no separable cost-remaining benefits cost allocation has been made. In lieu of this, for preliminary cost allocation purposes, each unit's costs have been distributed among purposes according to the generally consistent pattern which resulted from the several preliminary separable-costs remaining benefits allocations which were made in 1967 21 and years just prior thereto. - 11 Three Bureau of Reclamation published studies show preliminary allocations ~f the estimated costs of the storage project using the separable costs- remaining benefits method of allocation. They are: "Financial and Economic Analysis, Colorado River Storage Project and Participating Projects," dated February 1958 and December 1958 and "Colorado River Storage Project, Appendix of Attachments for Analysis of Proposal by Private Utilities to Wheel Power to Preference Customers" dated October 1960. The February 1958 study was reprinted as Senate Document 101 by the 2d Session of the 85th Congress. ~I An allocation made in 1966 is included in this report as Attachment 2 7