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<br />. <br /> <br />. <br /> <br />EXHIBIT A <br /> <br />Scope of Work <br />StateCU and StateWB Maintenance <br />December 5, 2001, <br /> <br />INTRODUCTION <br /> <br />The Colorado Water Conservation Board (CWCB) has requested upgrades, maintenance, and continuing <br />support for the StateCU consumptive use program and the State WB water budget program developed as <br />part of the CDSS system of models. As the programs are exercised by new users, including personnel at <br />the State Engineers Office, the CWCB, the Colorado River Water Conservation District (CRWCD), and <br />the Upper Gunnison River Water Conservancy District (UGRWCD), additional support and training have <br />been requested of the staff at Leonard Rice Engineers, Inc. (LRE). In addition, the users have asked that <br />new capabilities be added to the programs to help meet their specific needs. These are needs that were <br />not required for the initial CRDSS and RGDSS consumptive use analysis, but will likely be useful in <br />continuing CDSS efforts. <br /> <br />A new data management interface (OM!) called precu is being developed by Riverside Technology, Inc. <br />(RTi), under a separate contract with the CWCB, that will extract data from Hydrobase to create many of <br />the input files used by StateCU, As the primary developer of StateCU, LRE will assist RTi in <br />determining the options and functionality for precu. This new OM! will be tested on both the RGDSS <br />Historic Consumptive Use Scenario and the Upper Gunnison Scenario (developed by the CRWCD and <br />the UGRWCD) to re-create the input files used in those analyses. The precu command files used to <br />create the Upper Gunnison input files, and an associated step-by-step procedure memorandum, will be <br />developed for use in future Upper Gunnison depletion analyses. <br /> <br />LRE's RGDSS Scope of Work included the development of two water budgets for the Rio Grande Basin, <br />one for the entire basin in Colorado and one for the area defined by the ground water modeling efforts. <br />These water budget tasks were completed in May, 2001 using available data from other RGDSS <br />Contractors, including the Surface Water and Ground Water Contractors. As work continued on the <br />RGDSS, some of the components of the water budgets have been updated to reflect more detailed <br />modeling efforts. The CWCB has requested that the water budgets be updated to include these more <br />detailed components. <br /> <br />LRE recently completed a pilot study for the simulation of the monthly CRDSS surface water models <br />using the StateMod enhancements including variable efficiency and soil moisture accounting. The <br />resulting cost/benefit analysis recommended this approach be used to update CRDSS basins either when <br />regular updates occurred, for instance to coincide with updated irrigated acreage assessments, or when <br />applications required a better representation of the interactions between hydrology, diversions, and return <br />flows during dry or wet periods. The CWCB has requested that the CRDSS Gunnison River Basin <br />Monthly StateMod Model be enhanced to allow simulation with variable efficiency and soil moisture <br />accounting. <br /> <br />Boyle Engineering Corporation has recently completed an investigation of appropriate methods for <br />simulating the CRDSS river basin models using StateMod's daily time-step capabilities. It has been <br />recognized that monthly models do not capture daily variations in streamflow and call regimes that are <br />required for certain model applications. The Daily Pattern Approach was recommended as the <br /> <br />Page 10 <br />