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Approach: <br />Task 38 Collect Historic Aquifer Water Level and Ground Elevation Data <br />• Obtain existing electronic databases that are currently maintained by the State and, if <br />available, the USGS and the available paper-copy reports (as identified in Appendix B7 of <br />the SPDSS Feasibility Study) that contain information on ground water levels. <br />• Obtain digital elevation data from the USGS. Process as appropriate for use in expressing <br />depth to water as an elevation. <br />Task 44.1 Analyze and Map Historic Aquifer Water Level Data <br />• Coordinate with the Relational and Spatial System Integration Consultant to determine the <br />database structure that will be used for entry and/or formatting of these historic data. <br />• Reformat the existing electronic databases into the appropriate DSS (HydroBase) formats <br />The Consultant will obtain and review existing available ground water level data for the 1950- <br />2000 time period. <br />The water level database will include fields for the measurement location, surface elevation, <br />water level and measurement date, accuracy estimate and, where possible, the perforated <br />interval measured and the aquifer being monitored. <br />Evaluate whether the non-electronic historic data is suitable for addition to the SPDSS <br />database. These data will be evaluated to determine if it may provide an enhanced <br />understanding of the Denver Basin and Lower South Platte Regions' ground water <br />systems. Data that are necessary for future use to configure, calibrate and use in the <br />groundwater models that are a part of the SPDSS will be converted to an electronic format <br />and added to HydroBase. <br />• Summarize the database for descriptive purposes, including the database fields, number of <br />entries in each field by aquifer, measurement date, and sources of data. <br />• The water level maps of the Denver Basin Region will be prepared for up to four distinct <br />time periods (likely within the 1950's, 1970's, 1990's and for the current year (2002) <br />conditions for each aquifer layer, including the location of data used in the contouring. <br />For the Denver Basin Region the mapped aquifers include the following, as defined in the <br />SPDSS Feasibility Study: <br />- Alluvium of the South Platte and its tributaries <br />-Upper Dawson <br />- Lower Dawson <br />- Denver <br />- Upper Arapahoe <br />-Lower Arapahoe <br />SPDSS Groundwater SOW, Phase 1 Page 8 <br />