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1.1.3 Solicited Measurement of Autumn 2006 Water Levels <br />Of the 115 wells identified as candidates for autunul water level measurements, 29 wells have <br />water levels typically solicited by the DWR; water level measurements for an additional 11 <br />wells >11 the Poudre River Basin also were solicited from the City of Thornton. These 40 wells are <br />owned by 13 different entities. Each of the solicited entities was contacted by phone followed by <br />an email or letter that described the SPDSS project and requested an autumn water level <br />measurement for specific wells from October to December 2006. <br />Water level data were successfully collected from 31 of the 40 solicited wells and from 11 of 13 <br />entities (Table 1). Reasons for not obtaining a solicited water level measurement from 9 wells <br />uzclude the followuzg: <br />• Entity did not respond to solicitation requests (8 wells from 2 entities) <br />• Entity did not measure static autunu12006 water level (1 well from 1 entity) <br />Measurement results are presented in Appendix C. If a measurement was not obtained for a <br />well, the reason is explained in the table. This table is sorted first by aquifer and then by the <br />HydroBase identifier. The locations where autunuz water level measurements were obtained are <br />shown in Figure 2. The autumn 2006 solicited measurements were added to data downloaded <br />from HydroBase and used to create water level hydrographs for each well. These are presented <br />>11 Appendix D and discussed in Section 1.2. <br />1.1.4 Quality Assurance/Quality Control <br />A series of quality control steps were undertaken during the autumn water level collection <br />process as described below. <br />In the field, the measurement of t11e water level was repeated at each site. If the two <br />measurements differed by more than 0.5 feet or if there was uncertainty >11 a measurement <br />made using a steel tape due to smearing of the chalk or condensation on the tape, repeated <br />water level measurements were taken until satisfactory agreement was achieved between the <br />measurements. <br />Hard-copy data of field measurements were compiled into an electronic format and merged <br />wit11 electronic data in a Microsoft Excel~R~~ spreadsheet. T11e electronically compiled hard-copy <br />data were then checked for accuracy by comparing 100 percent of t11e values to the original <br />hard-copy data. All electronic solicited data received were checked for data importation errors <br />by comparing 10 percent of the values to the original electronic data sources. If errors in the <br />data entry were fowld or if the values appeared to be suspect >11 any way, the value was <br />confirmed and any errors were corrected in the spreadsheet. This procedure was used to assure <br />quality for all data. T11e data were then provided to the SPDSS project manager for inclusion in <br />HydroBase. <br />1.2 Analysis of Bi-Annual Data <br />Bi-aiu~ual water level measurements from wells measured under different phases of this task <br />are presented in a series of 1ydrographs for each well (Appendix D). There are hydrographs for <br />120 wells, which includes the 109 of the 120 wells targeted at the onset of this task, plus 11 <br />Thornton alluvial wells added in Phase 4. Eleven (3 solicited, 8 field visit) of the original <br />SPDSS Phase 4 Task 39 Technical Memorandum-Final <br />O~i20%2008 <br />