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I I. I I I I I I I Ie I I I I I I I. I I match between observed and calculated heads. Since this model is based on the work of Schenk, it will probably not help in reproducing the results of Banta's simulations. 4.6 Recommendations The results of Banta's model should be used for estimates of expected regional changes in groundwater levels. The smaller size of the grid cells over much of the basin and the resulting better resolution make this a more desirable model for use in this project. If the results of simulations for appropriate pumping rates are available, it should be possible to use these hydraulic head and drawdown values without the need to rerun the model. If appropriate results are unavailable for Banta's model, then it may be necessary to either use Robson's results for the simulation most closely matching the projected demand, recreate Banta's results, or rerun a model to derive groundwater level changes for different pumping rates. For recreation of Banta's results and derivation of new results for different pumping rates or different hydrogeologic parameters, we recommend that the version of the model converted to MODFLOW by Schenk be used. This will likely require limited recalibration to the data used by Banta, but the comparative ease of using the MODFLOW model probably outweighs any possible advantages of using the original Trescott-Larson model. 5.0 Phase 2 Scopes Of Work We have prepared two Phase 2 scopes of work. The first scope is for $30,000. This $30,000 budget matches the budget amount established for Phase 2 work in S.B 96-153. A second scope of work for approximately $33,500 is also presented. The second scope represents additional work which should occur to obtain a more complete study on the Economic Life of the Denver Basin aquifers. 10 HRS WATER CONSULTANTS, INC