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HYDROLOGIC CHARACTERIZATION AND MONITORING PLAN 8 <br />3.0 SOD AND DFL AREAS GROUNDWATER HYDROLOGY <br />There are no significant groundwater resources in the SOD and DFL areas. The only aquifer in <br />the region is associated with the alluvium of the North Fork of the Gunnison River, which is <br />located about three miles north of the SOD and DFL areas. A thin band of alluvium along <br />Minnesota Creek provides a limited groundwater source to local users. The leases in the SOD <br />and DFL areas involve mining in the E -Seam in areas well below the ground surface where the <br />overburden thickness ranges from about 375 to over 1,000 feet. The E -Seam outcrops in the <br />southeast portion of the SOD area along the upper Minnesota Creek drainage, dips to the <br />northeast, and does not outcrop in the DFL area (Plate 1). The potentiometric surface of the <br />groundwater in the E -Seam generally follows the structure (northeast dip) of the coal bed. <br />MCC has collected baseline water quality data and routinely monitors three wells in the SOD <br />area, including two alluvial wells (Upper Dry Fork Alluvial and Lower Dry Fork Alluvial), and <br />one bedrock well (SOM-C-76). The locations of the monitoring wells are shown on Plate 1. A <br />summary of the WEM (including the SOD and DFL areas) groundwater monitoring well <br />characteristics for the SOD area is presented in Table 3. A summary of the groundwater quality <br />data for select parameters is presented in Table 4. Additional baseline water quality and water <br />level data for WY 2015 are presented in Appendix D. Complete historical well water quality and <br />flow data are presented in AHRs prepared by HydroGeo (2002 through 2016a). The <br />comprehensive hydrologic monitoring plan for the WEM is discussed in Section 4.0 of this <br />document. <br />Revised 09/07- PRI 2; 08/16- TRI 39 H droGeo, Inc. <br />