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database for data importation/data entry accuracy on a 10-percent quality control frequency. If <br />errors in the data entry were found, the error was corrected in the spreadsheet. If an error was <br />found then 100 percent of the data from that data source was checked. The spreadsheet was <br />then uploaded into the HydroBase-compatible SPDSS database. This procedure was used to <br />assure quality for all data that was added to the SPDSS database. <br />After the database was checked for quality control purposes and outliers were identified and <br />screened, the resulting database contained 1,572 unique bedrock wells with 24,384 unique <br />bedrock water level measurements in the Denver Basin Region. <br />3.0 Results <br />This section presents a summary of the bedrock aquifer water level data for the Denver Basin <br />Region. The data are presented in Section 3.1 in plan-view maps of the water level surface from <br />each aquifer at specified time periods, in trend maps for the 1990 to 2005 period in Section 3.2, <br />and in hydrographs that depict water level trends over time at individual wells from <br />throughout the Denver Basin Region in Section 3.3. <br />The water level contours, database water level measurements, and control points presented in <br />this section will be provided in shapefile format to the DWR as part of this TM. <br />3.1 Water Level Surfaces <br />The five time periods selected for water level mapping and comparison were 1968, 1978, 1990, <br />2001, 2003, and 2005. These time periods were selected to characterize groundwater levels <br />through the study period, and to be used for calibrating groundwater flow models. Where <br />sufficient data exist, water level maps for each aquifer for these selected time periods were <br />developed, and are shown in Figures 5 to 18. The well locations where water level <br />measurements were available in the selected year are posted on each figure. <br />As presented in Section 1.4, some aquifers have substantially more water level data than others. <br />There were several of the selected time periods where there was not enough data to generate <br />even a partial water level map for a given aquifer layer. This was the case in 1968 for the all of <br />the bedrock aquifers; however, this time period was selected because there is a comprehensive <br />set of water level measurements available for the alluvial aquifer for this year. <br />In 1978, there were sufficient data to generate water level maps for portions of the Dawson and <br />Laramie-Fox Hills Aquifers (Figures 5 and 6). In 1978, water level measurements in the Dawson <br />are primarily located in the southern portion of the aquifer with one measurement in the north <br />(Figure 5). Water level measurements are available for only a limited portion of the Laramie-Fox <br />Hills Aquifer in 1978, in the area north of Denver and west of the South Platte River (Figure 6). <br />This area is commonly referred to as the "Complex Area". As noted in the Introduction there is <br />extensive faulting and vertical displacement in the geology in this area thus; water levels must <br />be viewed with caution. <br />Water level measurements available in 1990 were sufficient to allow general characterization of <br />potentiometric surface gradients in portions of each of the major bedrock aquifers (Figures 7 to <br />SPDSS Phase 3 Task 44.2 TM -Final 12 <br />11/28/2006 <br />