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• Rufc 2: Perntils <br />2.04.7 HYDROLOGY DESCRIPTION <br />Groundwater <br />Depth and Extent of Water Bearing Zones <br />Drilling was performed to determine the depth and horizontal extent of the water-bearing zones <br />at the site. Generally, the Primero seam is at 6800 feet and the Ciruela seam is at 7200 feet <br />AMSL. The thickness and extent of each unit aze described within the Geology Technical Report <br />(Exhibit 6). All information collected for the groundwater monitoring program is provided in <br />Exhibit 7, Groundwater Technical Report. <br />Overburden <br />During the drilling of the overburden for the Ciruela wells, no water was encountered, with the <br />exception of the wells at site MW-lA. Nominal amounts of water were encountered in the <br />overburden well MW-lA with a flow rate (estimated during drilling) of less than 5 gpm. At the <br />other two pad sites, MW-2 and MW-3, no water was encountered in drilling through the <br />overburden. Wells were installed in the overburden at the sites MW-lA and MW-2. Two of the <br />• three proposed wells at the MW-3 site were not installed, since groundwater was not encountered. <br />Data from the drilling at MW-2 and MW-3 indicates that the aquifer is discontinuous, at best. <br />Cirue/a Coal <br />Drilling of the Ciruela seams was at locations MW-1, MW-lA, MW-2, and MW-3. Drilling in <br />these areas encountered limited water (<5 gpm) in the location MW-lA. Drilling at the MW-1 <br />location was moved to the MW-lA location after the initial boring determined the coal was <br />pinched out at the MW-1 location. Drilling in the MW-2 and MW-3 locations did not encounter <br />any water. Two of the three wells in the MW-3 site were not installed, since water was not <br />encountered. <br />Interburden <br />Drilling in the second interburden zone (Primero) did not indicate large quantities of water in this <br />zone. Water was encountered in the drilling for MW~ at approximately 25 feet below grade, but <br />this well is located in an alluvial valley, and the alluvium is thought to be the source of this water. <br />Increased production of water was not noted as the boring progressed. Wells were set in the <br />sandstone immediately overlying the Primero, since water production more than 5 gpm was not <br />noted during drilling. The location MW-6 encountered water at approximately 110 feet below <br />grade, but groundwater flow from this formation was also nominal. The location MW-5 <br />encountered groundwater in the boring at 50 feet below grade, and a flow of 125 gpm was <br />• <br />PERMff.d]5\Dcember T0. 19% 2.04-9 <br />