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~ 53-4'9 ( . long term effective use of the Denver Basin aquifcr as an integrated component of the conjunctive use concept; . the regulatory and institutional constraints to a "South Platte River water-only" conjunctivc usc alternative; . all monetary, regulatory, and environmental costs, including costs to mitigate environmental impacts and the costs to obtain any South Platte water; . a determination of what, ifany, additional waterrcsources are necded beyond "South Platte-only conjunctive use" for both thc planning period through the year 2050 as well as for years beyond that time as may be identified by the Study Board and confirmed by the Management Team. This second planning condition will be addressed qualitatively; . a "paper study" of the large-scale feasibility of regional ground water recharge using the results ofrccent recharge programs at Willows Water District and Centennial WSD, as well as discussions with USGS and others; and . a preliminary design, study protocol, and estimated cost for a large scale recharge and recovery demonstration project will be prepared and submitted to the Study Participants and the Management Team. It is assumed that the demonstration project will use existing infrastructure or nominal interconnections to convey renewable supplies to specific locations throughout the Study Participants' service area. The implementation of any demonstration project is not part of the Study effort. ( ,- Task 4: Conjunctive Use That Requires Importation Of Water From Beyond The South Platte Drainage Basin And That Potentially Increases Colorado River Depletions - a feasibility study of conjunctive use alternatives using surface water sources from existingfacilities of Denver Water throughout its collection system. Conjunctive use options using surface water sources from all existing Denver Water facilities (on either side of the Continental Divide) will bc analyzed as a component of a long term water supply strategy for Study Participants use. The Study Board will direct the timing and integration of this approach prior to any work by the consultant. The consultant will assume that all reasonable conservation and non-potable reuse programs are in place and operational and the most efficient groundwater management option, as agreed to by the Study Board in Task 3, is in place and operating. it is assumed that thc identified South Platte supplies for conjunctive use purposes are available. Based upon these assumptions, the consultant will conduct a feasibility analysis of these components, including the following items: . the monetary, regulatory, and environmental costs including costs to mitigate impacts to the Colorado River Basin; . the regulatory, environmental, and institutional issues for a conjunctive use componcnt that potentially increases depictions of Colorado River water; and c dcwra scope orwork 12101/99 7