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Ms. Maryanne C. Bach 12/28/98 Page 3 000008 losses with a portion of return flows from Colorado River water, Denver is claiming successive use credit due to evaporation as shown in Column (2) of Table IV. West Slope Storage In addition to the tables described above, the following information is provided. Authorized storage in Dillon Reservoir on September 30, 1997, was 254,134 acre-feet and on September 30, 1998, it was 251,768 acre-feet, for a net change of -2,366 acre-feet. Similarly, on September 30, 1997, authorized storage in Williams Fork Reservoir was 90,071 acre-feet and on September 30, 1998, it was 91,019 acre-feet, for a net change of +948 acre-feet. Successive Use Program As shown in Table IV, Denver continued to make successive uses of its Colorado River water in 1998. During the water year, Denver reclaimed 18,515 acre-feet of transmountain effluent for beneficial use in the Denver Metropolitan area. This volume is 14<r>i<> of the average since 1966, but is lower than the successive use during the 1988-1996 period. This is due primarily to higher than average native water supplies available in the South Platte River basin combined with relatively junior water right calls downstream of Denver on the South Platte for significant lengths of time during the high usage season from May to August. These conditions preclude opportunities to exchange reusable effluent. The river call conditions are also demonstrated by relatively low evaporation credit claimed from Denver's South Platte reservoirs. Denver continues to actively pursue maximizing its use of transmountain return flows. During 1998, Denver continued to pursue implementation of the Board of Water Commissioner's near term water supply strategy for producing 55,000 acre-feet of water needed to extend Denver's water supply to the year 2030. The strategy contains the elements of non-potable reuse, small- scale system refinements, water conservation, and cooperative supply projects. These elements were selected after completion of Denver Water's Integrated Resource Plan (IRP). Nonpotable Reuse Project. Nonpotable reuse would greatly enhance Denver's successive use of Colorado River water. The project being planned involves the construction of a 45 mgd nonpotable reuse plant that would receive effluent from the Metro Wastewater Reclamation District plant and further treat the effluent so it can be delivered for irrigation and industrial uses. Denver plans to construct the project in three phases, with the last phase bringing the total amount of water served to about 15,600 acre-feet per year. Currently, Denver is conducting a pre-design study to further define the plant size and processes, distribution system layout, customer demands, and quality needs for the reuse project. Construction is slated to begin the last part of 1999. The first phase of operations is scheduled to begin in 200 I. Denver has already made agreements for delivery of over 8,000 acre-feet of nonpotable reuse water with future users. Public Service Company of Colorado has committed to 5,200 acre-feet of this total for use at their Cherokee Power Plant. Also, the Rocky Mountain Arsenal plans to use about 1,200 acre-feet of reuse water and DIA's Central Plant will use about 260 acre-feet. The remaining commitments are from irrigation users.