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~. ~~ a <br />EXHIBIT A-4 <br />• <br />Scope of Work <br />South Platte Decision Support System Phase 4 <br />Groundwater Component <br />September 15, 2006 <br />Introduction <br />Following is the Phase 4 Scope of Work for the groundwater component of the South Platte <br />Decision Support System (SPDSS). The Scope of Work is based on the SPDSS Feasibility Study <br />(FS) final report dated October 2001 and from work associated with Phases 1, 2 and 3. The data <br />collection and analysis activities will occur within the Denver Basin and the Lower South Platte <br />Regions and are an extension of data collection that occurred in Phases 1 through 3. <br />The SPDSS implementation is occurring in phases. The objectives of this Phase 4 groundwater <br />scope of work are to build on work that was done in Phases 1, 2 and 3, and are as follows: <br />• Collect water level data, <br />• Develop estimates of stream gain/loss, <br />• Enhance HydroBase and Phase 1 through 3 Technical Memoranda describing our <br />understanding of the groundwater system based on Phase 4 data, <br />• Calibrate the alluvial groundwater model developed under Phase 3, <br />• Review and monitor USGS modeling efforts for the Denver Basin, <br />• Evaluate area for underground water storage. <br />Table 1 lists the Phase 4 ground water activities identified in the SPDSS Feasibility Study to <br />achieve these objectives. The Task numbers were assigned by the Colorado Water Conservation <br />Board, the lead agency on this project, with activities corresponding to those listed in Appendix C <br />of the SPDSS Feasibility Study. Cost and schedule to complete these Phase 4 tasks are presented <br />in Exhibits B-3 through E-3, which are attached at the end of this Scope of Work. <br />Table 1 -Phase 4 Ground Water Tasks <br />Task 39 Collection of Water Level Data <br />Task 46 Develo Stream Gain/Loss Estimates <br />Task 47 USGS Denver Basin Modelin Coordination <br />Task 48 Alluvial Groundwater Modelin <br />Task 49 Under round Water Stora e Evaluation <br />Task 50 Data Centered Modelin Tool Im lementation <br />Task 51 Phase 4 Mana ement and Meetings <br />SPDSS_Phase4_gw_SOW_09-15-06.doc <br />