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Robson (1983) in Figure 19. Variability exists between some neighboring data points <br />indicating the storage coefficient in this aquifer may be more heterogeneous than other <br />Denver Basin bedrock aquifers. The data generally are higher than those provided by <br />Robson (1983) and are an order of magnitude greater than published estimates in some <br />locations, possibly due to the lack of low permeability beds throughout the aquifer's <br />thickness resulting in large areas in which it is unconfined. The lack of low permeability <br />beds would allow the aquifer to be unconfined throughout its entire thickness while <br />other aquifers that are interbedded would only be unconfined in the upper portions <br />while maintaining a degree of confinement in the lower units. The storage coefficient <br />data are generally slightly higher than the range expected for a confined aquifer. These <br />values will be used, with engineering judgment, in groundwater modeling to determine <br />the range of likely values for this parameter in the Laramie-Fox Hills Aquifer. Data <br />point values are presented with contoured data from Robson (1983) in Figure 23. <br />4.0 Summary and Conclusions <br />CDM completed SPDSS Task 43.2: the collection, analysis and mapping of aquifer <br />property data for the Denver Basin Region. This TM examines the sources and types of <br />data available, the data formats, data availability, and data processing to allow it to be <br />internally consistent and to be HydroBase compatible. The data were used in Phases 1 <br />and 2 to help identify additional data needs in the Denver Basin Region and to support <br />the design of the Phase 2 groundwater field data collection program. Data collected <br />under Task 43.2 will be used to support upcoming groundwater modeling of the Denver <br />Basin aquifers. <br />The Phase 2 Task 43.2 activities satisfied the Phase 2 objectives of collecting available <br />published aquifer property data, analyzing the data, enhancing HydroBase with these <br />data, and helping characterize the hydraulic properties of the bedrock aquifers in the <br />Denver Basin Region to support future groundwater modeling. <br />There is a high concentration of aquifer K data for the Denver Basin aquifers along the <br />Front Range Urban Corridor, but many other portions of the region are lacking in high <br />quality K data, as obtained from aquifer pumping tests, so specific capacity-based K data <br />were obtained to provide broader coverage. <br />This TM is not anticipated to be updated with data collected in future Phases of the <br />SPDSS; however, any aquifer property data received by CDM will be evaluated for <br />usefulness in upcoming SPDSS tasks and forwarded to the CWCB. <br />Below are conclusions from completion of this Phase 2 task. <br />The aquifer property data presented in this TM represent a significant <br />contribution to the knowledge and characterization of the groundwater system <br />within the Denver Basin Region and provided information in areas where little <br />or no data previously existed. These data helped to fill aquifer property data <br />gaps for the bedrock aquifers of the Denver Basin region. <br />SPDSS Phase 2 Task 43.2 TM -Final 25 <br />2/ 13/ 2006 <br />