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3. Enhance HydroBase with aquifer property data collected during the Phase 2 field <br />activities. <br />4. Analyze and map the aquifer property data obtained. <br />5. Collect data to support future development and calibration of a groundwater <br />model. <br />This Technical Memorandum (TM) was undertaken for Task 43.2 of Phase 2 of the <br />SPDSS, and summarizes the compilation, analysis and mapping of existing published <br />aquifer property data for the bedrock aquifers in the Denver Basin Region. A draft final <br />version of this TM has been reviewed by a technical Peer Review Committee; their <br />comments are reflected in this final version. <br />Approach <br />The following table summarizes the sections contained in this TM and identifies which <br />section pertains to the objectives outlined above. <br />Section Description <br />1.0 Aquifer Properties Data Collection and Analysis <br />1.1 Sources of Data <br />1.2 Data Anal sis and Processin <br />2.0 Aquifer Properties Database <br />2.1 Database Structure <br />2.2 Database Qualit Control <br />3.0 Results <br />3.1 H draulic Conductivit Data <br />3.2 Specific Yield Data <br />3.3 Storativit Data <br />4.0 Summar and Conclusions <br />5.0 Recommendations <br />6.0 References <br />1.0 Aquifer Properties Data Collection and Analysis <br />Aquifer properties describe the potential for groundwater flow and the water bearing <br />capacity of an aquifer. These aquifer properties include transmissivity, hydraulic <br />conductivity, storage coefficient, and specific yield. The transmissivity (T) defines the <br />flow potential through a unit width of the entire saturated thickness of an aquifer under <br />a unit hydraulic gradient. Typical units of measurement are gallons per day per foot of <br />drawdown (gpd/ft) and ft2/day. The hydraulic conductivity (K) defines the flow <br />potential through a unit volume of an aquifer. It represents the aquifer transmissivity <br />divided by the aquifer saturated thickness. Typical units of measurement for K are <br />ft/day. In the Denver Basin aquifers, which consist of more permeable sand beds <br />interbedded with relatively impermeable shale units, the aggregate sand thickness is <br />typically used to calculate K from T. <br />SPDSS Phase 2 Task 43.2 TM -Final 2 <br />2/ 13/ 2006 <br />