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.' ,. Metropolitan Water Supply Investigation Proposal Hydrosphere, Inc. Septmber 17, 1993 Page 47 Spronk Water Engineers, Inc. will summarize the historical development of the system; historical diversion, storage and delivery data; physical system components and storage and ditch losses; water rights and transfers; current operations including internal agreements; Metro wastewater plant pumping facilities, agreements and historical pumping volumes; existing agreements between FRICO and the Colorado Division of Parks and Outdoor Recreation regarding Barr Lake; and a description of FRICO's Milton Division. If needed for modeling purposes, Spronk would also develop estimates of irrigation demands for the various components of the Barr Lake system, Spronk and HRS Water Consultants, Inc. will review the water right decree (Case No. 84CW090) associated with Beebe Draw alluvial storage with a particular focus on those terms and conditions which may determine or influence how the water right is modeled. Consistent with that determination HRS will focus on the hydrogeology of the Beebe Draw. As part of FRICO's Beebe Draw augmentation plan, HRS constructed a a three- dimensional MODFLOW model of the Beebe Draw aquifer from Barr Lake to Milton Reservoir. HRS will review the historical and recent recharge to the system, including the recharge program implemented by FRICO and will retine the existing model incorporating these recent data. The decree for the aquifer allows aquifer storage of 100,000 acre-feel. However, this number was determined early in the application phase and does not have a detailed hydrogeologic foundation. Therefore, various future recharge, storage, and withdrawal scenarios will be analyzed as necessary to provide an estimate of the actual yield of the aquifer under different conditions of water availability and demand. If required, this analysis can include determination of expected increases in evapotranspiration due to the recharge, Because quality of water delivered to the Barr Lake system is a likely consideration in the Barr Lake Plan, Hydrosphere and Spronk will evaluate existing water quality data and standards including existing literature on agricultural water quality standards, existing water quality data for water diverted in the Barr Lake system, water quality characteristics of current Metro Plant discharges, and ambient water quality data for the South Platte River at or near the Burlington headgate. In addition, it will be necessary to look at the South Platte between the Burlington and Evans #2 diversions and to coordinate this effort with studies by the Metro Wastewater Disposal District, the U.S, Geological Survey and the U.S. Environmental Protection Agency. Hydrosphere will meet with TSC and Project Management Team to synthesize these investigations into a set of specified Barr Lake Plan scenarios for modeling. This work will be accomplished through a review of previous work done by the Project team and through a series of meetings with relevant entities including the Barr Lake companies, Thornton, South Adams County Water and Sanitation District, Metro Wastewater Reclamation District, Northern Colorado Water Conservancy District and others. Linkages With Other Tasks This task is part of the Project's Information Development focus area and would complement and be coordinated with Task 4 (Inventory) and Northern area special studies to insure complete coverage of topic areas and efficient use of meetings. The Information Development focus area would build upon the results of Scoping and would precede the Model Development and Opportunities Evaluation focus areas.