Laserfiche WebLink
Exhibit 71 Hydrologic Characterization South of the Divide Area and Monitoring Plan 8 <br />• 3.0 GROUND WATER HYDROLOGY <br />There aze no significant ground water resources in the SOD azea. The only aquifer in the region is <br />associated with the alluvium of the North Fork of the Gunnison River which is located about 3 miles <br />north of the SOD area. A thin band of alluvium along Minnesota Creek provides a limited ground water <br />source to local users. PR-10 involves mining in the E-Seam in azeas well below the ground surface in the <br />SOD area where the overburden thickness ranges from about 375 to over 1,000 feet. The E-Seam <br />outcrops in the southeast portion of the SOD azea along the upper Minnesota Creek drainage and dips to <br />the northeast (Map 1). The potentiometric surface of the ground water in the E-Seam (fall 2005) <br />generally follows the structure (northeast dip) of the coal bed as shown on Map 1. <br />MCC has collected baseline water quality data and routinely monitors 10 wells in the SOD azea, including <br />2 alluvial wells (Upper Dry Fork Alluvial and Lower Dry Fork Alluvial), and 8 bedrock wells (SOM-23- <br />H-1,SOM-23-H-2,SOM-23-H-3,SOM-23-H-4,SOM-C-76, 96-2-2, SOM-3B, and SOM-3E). The <br />locations of the monitoring wells are shown on Map 1. Additional strategically placed monitoring wells <br />will be added to the ground water monitoring network at least two years prior to mining, as necessary. A <br />summary of the WEM (including the SOD azea) ground water monitoring well chazacteristics for the <br />SOD azea hydrologic chazacterization is presented in Table 3. An abbreviated summary of the ground <br />water quality data is presented in Table 4 and additional baseline water quality and water level data aze <br />presented in Appendix C. The comprehensive hydrologic monitoring plan for the WEM is discussed in <br />Section 4.0 of this document. <br /> <br />Apri12006 HydroGea, Ine <br />