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Section Descri tion <br />D H drooraphs of Wells with Autumn Water Level Measurements <br />E Hydrographs of SPDSS Monitoring Wells with Continuous Data <br />LoaQers <br />F Monitoring Well Surve Results <br />1.0 Si-Annual Water Level Data <br />An objective of Task 39 is to collect autumn groundwater level data in the SPDSS study area <br />and download water level data from the data loggers installed in the SPDSS monitoring wells, <br />which are in both alluvial and bedrock aquifers. <br />1.1 Autumn Water Level Data Collection <br />The DWR measures water levels in a network of wells located throughout the Denver Basil <br />bedrock aquifers and the alluvial aquifers of the South Platte River Basin. The DWR measures <br />water levels in tlne spring and fall for the alluvial aquifer along the main stem of the South Platte <br />River. In contrast, the DWR measures water levels only in the spring for the alluvial aquifers of <br />some of the Designated Basins and in the bedrock aquifers of tlne Denver Basin. Therefore, the <br />focus for this task was to collect autumn water level measurements for wells in the Denver <br />Basin bedrock aquifers and tlne alluvial aquifers of some of tlne Designated Basins. In addition, <br />for Phase 4, water levels were collected in the alluvial aquifer of the Poudre River Basin. <br />The first step during Phase 2 for Task 39 was to identify a set of candidate bedrock wells of the <br />269 wells that had been measured by the DWR since 2000. Using the Phase 1 Task 42.2 bedrock <br />aquifer configuration data and well completion information, 109 of these wells were determined <br />to be completed in a single bedrock aquifer. These 109 bedrock wells were supplemented with <br />11 alluvial wells from Designated Basins to bring the total list of wells to be measured in the fall <br />of 2004 to 120 wells. These wells were selected to provide a good spatial distribution of <br />measurements within each aquifer. Tlnis group of wells was targeted in all subsequent pleases. <br />If a well could no longer be measured, it was removed from the target list for subsequent years <br />(e.g. if well owner denied access to well, it was not measured in subsequent years). The <br />exception to the initial target group of 120 wells is the addition of 11 alluvial wells owned by the <br />City of Thornton in the Cache La Poudre P`iver Basin. These 11 wells were added to the target <br />set in Phase 4. <br />A total of 83 of the 120 wells were successfully measured in tlne fall of 2004 for Phase 2. During <br />Phase 2 data collection, eight wells lead issues that caused them to be removed from tlne list of <br />Phase 3 wells to be measured: two wells were found to be capped, one well could not be found, <br />one well no longer existed and four wells were not visited due to weather constraints. The total <br />number of wells targeted for measurement in Phase 3 therefore was reduced from 120 to 112, <br />and 90 well measurements were obtained in Phase 3. <br />From this list of 112 candidate wells, the total number was reduced to 104 for Phase 4 activities <br />due to the following Please 3 occurrences at eight wells: <br />SPDSS Phase 4 Task 39 Technical Memorandum-Final <br />O~i20%2008 <br />