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3.1 Selection of Wells <br />Wells were evaluated for this task by applying t11e following criteria approved by the State <br />SPDSS team: <br />• Well must be completed in only one aquifer as defined by the Denver Basin Rules, <br />2 CCR 402-6 (DWR 1985) <br />• Well must be located in t11e Denver/Sout11 Metro area or in t11e Colorado <br />Springs/Monument area, which are considered pumping centers of the Denver Basin <br />• Well must not pump during the duration of the water level data collection <br />• Well must not have an obstruction which would prevent installation of a data logger <br />• Well must be able to be secured for the protection of t11e data logger <br />• Access to the well will be granted by owner twice per year for the next two to three <br />years for data retrieval <br />• No nearby pumping well in t11e same aquifer (within approximately one half mile) is <br />active during t11e duration of the water level data collection <br />A list of candidate wells was compiled from wells identified through the measurement program <br />discussed in Section 1.0 and from mtulicipal and consultant contacts established during SPDSS <br />Phase 2 Task 37. Task 37 included the solicitation of aquifer pumping tests from entities and <br />also the completion of new aquifer pumpuzg tests. The candidate list was evaluated using the <br />criteria fisted above. Four wells, each of which is completed in a different one of the four <br />principal Denver Basin bedrock aquifers, were selected and presented to t11e State for approval. <br />Verification t11at each well was completed in only one aquifer was accomplished by comparing <br />the construction reports to the SPDSS Phase 2 bedrock aquifer configuration data. The four <br />wells are located northeast of Castle Rock at the Castle Oaks 3 (C03) and Castle Oaks 6 (C06) <br />well fields; the locations are shown in Figure 3, near the south-central part of $Ze figure. These <br />well fields are owned by a private entity. The well names and the aquifers they are completed in <br />are as follows: <br />o C03-LTDW (Lower Dawson Aquifer) <br />o C03-TKD (Denver Aquifer) <br />o C03-KLF (Laranue-Fox Hills Aquifer) <br />o C06-KA (Arapahoe Aquifer) <br />A site visit was performed to evaluate eac11 well according to the above criteria and to measure <br />the depth to water. Following the site visit, final approval was given by the State SPDSS project <br />team to instrument the wells wit11 data loggers. A locking well cap was designed and built for <br />each well to allow the data logger and its associated cable to be secured inside t11e well. <br />3.2 Installation of Monitoring Equipment <br />On May 2, 2006, non-barometric cotnpensatilzg data loggers were installed in t11e four wells and <br />programmed to collect water level readings on hourly intervals. Additionally, to allow for <br />compensation for barometric pressure changes on the water levels, separate barometric <br />pressure transducers and data loggers were installed. Table 6 presents the initial depth to <br />groundwater piezometric Head, date of measurement, and t11e approximate depth of the data <br />logger. <br />SPDSS Phase 4 Task 39 Technical Memorandum-Final 19 <br />O~i20%2008 <br />