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There were two problems encountered during the period covered by the Phase 3 water level <br />data download. First, there are no data from the Upper Arapahoe bedrock well (DSSBR01) from <br />mid-May 2005 to mid-December 2005. The data logger was removed from well DSSBR01 during <br />this time for repair. Second, the data for one of the alluvial wells (DSSI9BBD) from January 2006 <br />to June 2006 have been excluded from the data to be submitted for inclusion to HydroBase <br />because the drift error was 1.8 feet at the time of the download and the maximum water level <br />change during the period was 3.4 feet. Additionally no sudden offset was observed in the water <br />level data for the period of record. The data logger was replaced during the June 2006 data <br />download. <br />Hydrographs for each monitoring well, including all data since the data loggers were installed, <br />are presented in Appendix D. The average daily water level measurements from Phase 3 will <br />be provided to the SPDSS project manager for inclusion into HydroBase. Water level <br />monitoring is anticipated to continue at all wells equipped with data loggers through Phase 5. <br />1.3 Evaluation of Water Level Trends <br />A preliminary review of the hydrographs indicates that water level trends at the SPDSS <br />monitoring wells can be grouped into four different categories: <br />• Category 1- Groundwater levels rise during the winter months and decline during the <br />growing season, <br />• Category 2- Groundwater levels fall during the winter months and rise during the <br />growing season, <br />• Category 3- Groundwater levels appear to be greatly influenced by stream stage in the <br />South Platte River <br />• Category 4- Groundwater levels remain relatively constant throughout the year. <br />Table 1 presents a summary of which SPDSS monitoring wells fall into each category. DSSIIILF <br />does not fit any of the categories since its trend is dominated by a nearby augmentation well <br />with long periods of continuous pumping. DSSI6HND has periods which fall into both <br />Categories 1 and 2. <br />SPDSS Phase 3 Task 39 Technical Memarandum -Final <br />09/27/2006 <br />