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Table 1: Number of Geophysical Well Log Picks Used in Analysis <br /> <br /> <br /> <br /> <br />ormation Name <br /> <br />Queried <br />from <br />HydroBase <br /> <br /> <br />uplicate <br />Picks <br /> <br /> <br />utlier <br />Picks Total <br />HydroBase <br />Picks Used <br />in <br />Analysis <br /> <br /> <br />ontrol <br />Points Total <br />Number <br />of Picks <br />Used in <br />Analysis <br />Dawson top 70 5 6 59 61 120 <br />Upper Dawson bottom 277 0 8 269 1 270 <br />Lower Dawson top 347 0 16 331 1 332 <br />Dawson bottom 799 137 21 641 28 669 <br />Upper Dawson sands 130 0 1 129 197 326 <br />Lower Dawson sands 376 0 1 375 0 375 <br />Dawson sands 493 99 3 391 0 391 <br />Denver top 712 0 29 683 127 810 <br />Denver bottom 1,165 0 12 1,153 101 1,254 <br />Denver sands 852 0 0 852 322 1,174 <br />Arapahoe top 1,777 149 39 1589 220 1,809 <br />Upper Arapahoe bottom 650 0 15 635 0 635 <br />Lower Arapahoe top 629 0 11 618 1 619 <br />Arapahoe bottom 2,037 248 27 1,762 104 1,866 <br />Upper Arapahoe sands 558 0 0 558 383 941 <br />Lower Arapahoe sands 565 0 0 565 0 565 <br />Arapahoe sands 2,722 1282 0 1,440 0 1,440 <br />Laramie-Fox Hills top 2,309 0 37 2,272 262 2,534 <br />Laramie-Fox Hills bottom 2,536 0 11 2,525 120 2,645 <br />Laramie-Fox Hills sands 1,746 0 0 1,746 369 2,115 <br />Total 20,750 1,920 237 18,593 2,297 20,890 <br />1.2.3 Gridding Methodology <br />The aquifer configuration picks for the top, bottom, and net sand thickness for a given <br />aquifer were gridded and contoured using the kriging method in the software package <br />Surfer® (Version 8; Golden Software). Gridding is the process by which randomly <br />scattered data are projected onto a uniformly spaced grid using an algorithm of choice. <br />Contouring is the process by which lines of equal value are fit to the values of the <br />uniform grid. For each surface, a variogram, which defines the variation in data related <br />to distance, was developed. A function was fitted to each variogram that was used when <br />Bidding each surface with the kriging method. Table 2 provides the variogram details <br />for each surface using the terminology from the Surfer contouring package. The <br />geometry of each surface is unique, and therefore, the properties for the variograms vary <br />between surfaces. <br />SPDSS Phase 2 Task 42.2 TM -Final 7 <br />2/13/06 <br />