2010-02-09_PERMIT FILE - C1982056A (6)

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Colorado Yampa Coal Company and submitted to the DMG (formerly the CMLRD) in January, 1986. A copy of the. report is included as Exhibit 35, Backfill Hydrologic Evaluation. The water quality characteristics of the backfilled areas of the adjacent sulfate mines are represented by analyses of discharge from these materials near Sediment Pond F of CYCC's Eckman Park operation. This data shows a fairly consistent water quality characterized by TDS concentrations of about 4,000 mg /l and a strong calcium - magnesium- sulfate dominance (Figure 4 -g, Ground Water Quality Data). Known Uses of Ground Water As described in the 1983 PAP, ground water in the Twentymile Park Basin is not suitable for most domestic uses. All existing registered wells in the permit and adjacent areas are owned by TCC, and utilized for washdown, dust control and other mine- related purposes. Based on accepted water quality standards, use of ground water in the general area is restricted to livestock watering, irrigation, and limited domestic use. A review of Colorado State Engineers records indicates several adjudicated wells within the general vicinity of the Permit Area. Wells falling within the Permit Area are listed on revised Table 9, Summary of Ground Water Rights, and located on revised Map 15, Alluvial Valley Floors and Water Rights. The location and completion information for these wells was reviewed to assess whether or not there is the potential for adverse impacts to these wells as a result of planned mining and related operations. TCC also conducted an inventory of Trout Creek sandstone wells in the area, including field locating the wells and measurement and recording of baseline water levels. Several wells in the vicinity of the Permit Area are completed within the colluvium of Trout Creek and Middle Creek, upstream from any mine discharge or affected bedrock discharge effects. Two wells (Robert George and Rausler), located in the Foidel Creek drainage in Sections 22 and 27, TSN, R86W, are completed in the Upper Williams Fork Formation, probably in the Holderness member above the Twentymile Sandstone. Five wells (John Adams 1 & 2, Terry Green, Energy Fuels Corp., and New Energy No. 6), which appear to be completed in the Trout Creek sandstone, are indicated in the State Engineer's records. The Trout Creek sandstone potentiometric levels may be lowered if significant mine inflows from this unit are realized as described in the Probable Hydrologic Consequences section of the permit application. Two of these Trout Creek sandstone wells, both recorded as being located in Section 13 of TSN, R86W could not be located in the field by TCC and are assumed abandoned, not in use or the locations recorded in the State's files are incorrect. The other three wells, one of which is owned by TCC, have been located and baseline water levels were recorded on June 25, 1986 for two of the wells as follows: WELL QTR/QTR SECTION TOWNSHIP RANGE WATER LEVEL (FT. BELOW TOP OF CASING Energy Fuels NESE 02 5N 86W 33 Corp. Well Terry Green SENW 36 5N 86W 65 (Pumping Level) Well New Energy SWNW 32 5N 86W Not Measured Well No. 6 TCC extended into the EMD, developing the 9- and 10 -Right Gateroad extensions. The wells which are located within or adjacent to the area overlying this area are presented in Exhibit 6B, Summary of Ground Water Rights. These wells are shown on Map 11A, Well Locations for Eastern Mine District. A review of the wells listed in this exhibit indicates that the wells are relatively shallow. This is important, because the wells are completed in a local sandstone (presumed to be the Fish Creek sandstone) which overlies the massive Marine shale. Subsequent • development in the NMD and WMD will not impact any known existing wells that are not owned by TCC. PR09 -08 2.04 -24 09/15/09