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Table 2: Aquifers, Time Periods, and Water Level Contour Parameters <br /> <br />Year <br /> <br /> <br />uifer <br /> <br /> <br />loe <br />Number of <br />Water Level <br />Measurements Number of <br />Excluded <br />Water Level <br />Measurements Number of <br />Water Level <br />Measurements <br />Used to Contour <br />1978 Dawson 11.0 34 1 33 <br />1978 Laramie-Fox Hills 2.4 104 0 104 <br />1990 Dawson 1.0 26 1 25 <br />1990 Denver 3.2 41 0 41 <br />1990 Arapahoe 2.5 60 2 58 <br />1990 Laramie-Fox Hills 2.4 53 1 52 <br />2001 Dawson 1.0 17 1 16 <br />2001 Denver 2.9 44 1 43 <br />2001 Arapahoe 3.3 61 2 59 <br />2001 Laramie-Fox Hills 0.8 47 1 46 <br />2003 Dawson 1.0 25 1 24 <br />2003 Denver 3.83 41 1 40 <br />2003 Arapahoe 2.0 52 2 50 <br />2003 Laramie-Fox Hills 1.1 39 0 39 <br />2005 Dawson 4.5 31 3 28 <br />2005 Denver 6.0 47 1 46 <br />2005 Arapahoe 3.4 63 3 60 <br />2005 Laramie-Fox Hills 0.8 44 1 43 <br />After the initial gridding and contouring was performed, each grid was reviewed for water <br />level measurements causing bull's-eye contours or anomalous bends in the contours. Water <br />levels that caused the bull's-eye or anomalous contour shapes were evaluated by comparing the <br />water level at the given time period against the water levels at that well at other times. Water <br />level measurements with an anomalous reading for the period being contoured were excluded. <br />However, when water levels measurements identified for contouring with water levels <br />consistent throughout its time series were left in the data set, even if the water levels differed <br />from neighboring water level measurements. It was assumed that such measurements <br />represented wells near areas of persistent pumping, and removing such measurements would <br />give a false representation of actual water levels. All excluded data are noted in Appendix B. <br />A 100-foot contour interval was chosen for each of the bedrock water level maps developed for <br />this TM. This contour interval was determined to be sufficiently detailed to represent the <br />regional water level trends, and was appropriate due to the large range in water level elevations <br />and the general lack of water level measurements available. Contours are not shown in the <br />portions of each map where insufficient data exists. In general, contour lines extend <br />approximately 5 miles beyond the nearest data point. Contours were trimmed manually in <br />remaining areas where there was no supporting data. The lack of contour lines on many of the <br />maps indicates the sparcity of bedrock water level data available for many areas of the Denver <br />Basin Region. The contours presented in this TM are representative of water levels at a <br />SPDSS Phase 3 Task 44.2 TM -Final <br />11/28/2006 <br />