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<br />r;445 <br />Soulh Mi!lro Croundwaler Model Development Report <br /> <br />Del. /1,200] <br />Puge I <br /> <br />I <br /> <br />1.0 <br /> <br />INTRODUCTION <br /> <br />This report summarizes progress in the development of the regional groundwater model <br />to be used in the South Metro Water Supply Study (SMWSS). The report focuses on <br />summarizing work completed to-date on the project, including tasks and rcsults <br />previously reported on, as well as the results of recently concluded data screening and <br />analyses. The described work provides a foundation for development and <br />implementation of the regional groundwater model to be used for the SMWSS project. <br /> <br />') <br />/ <br /> <br />In the interest of completeness, we include summaries and conclusions from the series of <br />letter reports and memos previously provided by Hydrosphere to the SMWSS Board. <br />Those documents include: <br />. 11/27/00 GW Model Requirements Elicitation / Questionnaire <br />. 1/8/01 GW Model Requirements memorandum <br />. 2/28/01 GW Model Comparative Modeling Study Summary <br />. 3/16/01 GW Model Review ofSB-74 C6 Model <br />. 4/19/01 GW Model Development Plan <br />. 5/16/0] GW Model Comparative Modeling Study Summary - Addendum <br /> <br />This set ofdocumcnts, together with the August 3, 2001 letter from Mr. Peter Binney to <br />Dr. John Bredehoeft, constitute the basis for developing a regional groundwater model for <br />analysis of South Metro Water Supply alternatives. <br /> <br />During the course of this model development effort, some concerns have been raised by <br />two of the project Peer Review panelists (e.g., 9/21/01 letter from Parker Water and <br />Sanitation District to Peter Binney). A secondary objective of this letter report is to <br />address those concerns. We do this by describing the work, both completed as well as <br />planned, that directly relates to those concerns. <br /> <br />It is important to recognize that many of the raised concerns relate to use of the Colorado <br />State Engineer's Office (SEO) S8-74 Denver Basin model as the foundation for the <br />SMWSS regional groundwater model. Even though the SB-74 model does represent the <br />most complete integration (into a quantitative predictive tool) of Denver Basin <br />hydrogeologic data and information developed to date, there are a number of assumptions <br />that were made during model development that place limitations on what can, and cannot, <br />be drawn from model results. Section 2 of this report discusses some of the assumptions <br /> <br />Hydrosphere Resource Consultants <br />1002 Walnut Suile 200, Boulder, CO 80302 <br />PO Box 445, Socorro, NM 87801 <br />