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Approach <br />The following table summarizes the sections contained in this technical memorandum. <br />Section Descri tion <br />1.0 Identification of Candidate Wells <br />2.0 Water Level Measurement Collection and Solicitation <br />2.1 Water Level Measurement Collection <br />2.2 Measurement Solicitation <br />3.0 Results <br />3.1 Water Level Measurement Pro ram <br />3.2 Water Level Measurement Solicitation <br />3.3 Qualit Assurance/Qualit Control <br /> Appendices <br />A Evaluation of Measurement Methods <br />B Sonic Water Level Meter <br />C CWCB Well Owner Letter <br />1.0 Identification of Candidate Wells <br />This section discusses the process used to identify wells from which to collect autumn water <br />levels. The SEO measures water levels in a network of wells throughout the Denver Basin <br />aquifers and the alluvial aquifer of the South Platte River. In alluvial aquifer wells along the <br />mainstem of the South Platte River, the SEO measures water levels in the spring and fall, <br />whereas, for the bedrock aquifers in the Denver Basin Region, only spring measurements are <br />collected. Therefore, this task focused on autumn water level measurements in Denver Basin <br />bedrock wells. <br />The number of wells measured each year varies somewhat so the first step in this task was to <br />identify a set of candidate wells that have been measured for at least ten years and have been <br />measured in the last two years. A review of the data indicated that 269 wells met these criteria. <br />Due to scope and budget limitations not all of these wells could be measured. In this task up to <br />120 wells in the SEO water level monitoring network were scoped for measurement during the <br />fall, so a second step was to identify a subset of wells that would provide a good spatial <br />distribution of measurements within each aquifer and are completed in a single aquifer. <br />A review of well completion information for approximately ten wells in the SEO's bedrock <br />aquifer water level monitoring network by state staff indicated that most of these wells were <br />completed in multiple aquifers. Due to this finding, it was determined by the SPDSS project <br />manager and other state staff that well completion information of all wells in the SEO bedrock <br />water level monitoring network should be reviewed before identifying candidates for fall <br />measurement. Well completion information was used to determine if a well was completed in a <br />single bedrock aquifer as defined by the Denver Basin Rules (2 CCR 402-6), which includes six <br />aquifers. A total of 269 well permits were requested from the State. <br />These permits were reviewed for well completion information including well depth, screen <br />interval, grouting interval, and elevation of ground surface. Using this information, the sensing <br />