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Exhibit 71 Hydrologic Chazacterization South of [he Divide Area and Monitoring Plan 12 <br />• flow from SOM-3E was less than 0.5 gallons per minute (gpm) (HydroGeo, 2003b). The potentiometric <br />surface of the ground water in the E-Seam (Fall 2005) shows that ground water flows to the northeast at a <br />gradient of about 4 percent and that the E-Seam is dry about 6, 000 feet from the outcrop. The E-Seam <br />potentiometric surface and surface outcrop is shown on Map 1. <br />Monitoring data were collected from well SOM-23-H-2-from 1994 to 1998. Monitoring and data <br />collection at this well was re-initiated in 2005. Monitoring data have been collected continuously from <br />well SOM-3E since 2003. The E-Seam ground water quality data indicate consistently high levels of <br />TDS, iron, and manganese. <br />3.2.3 Strata Above the E-Seam <br />Well 96-2-2 is installed in the strata between the F- and E-seams and is currently being monitored. No <br />permeability data are available for this well. Monitoring data have been collected from this well since <br />1996. The ground water quality data of the strata above the E-Seam indicate consistently high levels of <br />TDS, iron, and manganese. <br />3.2.4 F-Seam <br />Wells SOM-23-H-3 and SOM-C-76 are installed in the F-Seam and are currently being monitored. Based <br />on test data of well SOM-C-76, the calculated hydraulic conductivity of the F-Seam is 2x10'4 cm/sec <br />(0.57 fUday). <br />Monitoring data were collected from well SOM-23-H-3-from 1994 to 1998. Monitoring and data <br />collection at this well were re-initiated in 2005. Monitoring data have been collected from SOM-C-76 <br />since 1978. The F-Seam ground water quality data indicate consistently high levels of TDS and iron. <br />3.2.5 Barren Member above F-Seam <br />Well SOM-23-H-4 is installed in the Barren Member of the Mesaverde Formation above the F-Seam and <br />is currently being monitored. No permeability data are available for this well. Monitoring data were <br />collected from well SOM-23-H-4-from 1994 to 1998. Monitoring and data collection at this well were re- <br />initiated in 2005. The ground water quality data of the Barren Member strata above the F-Seam indicate <br />consistently high levels of TDS. <br />i~ <br />Apri12006 HydroGeo, Ine. <br />