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-20- Cameo seam subcrops below the East Salt Creek alluvium, approximately 3 miles upstream of the mine. Very little recharge of water in coal seams and sandstones will occur along the outcrops due to the low annual precipitation rate (8.8 inches) and the steep slopes which favor runoff over infiltration. The applicant has no monitoring well completed in strata overlying the underground mine workings. This is because of the inaccessibility of the characteristically steep terrain of the "Book Cliffs" region to truck-mounted drill rigs. Previous explorations drill holes in the area of the McClane Canyon Mine have been dry to a depth in excess of 200 feet below the Cameo seam. The Cameo seam's associated roof and floor strata are not saturated in the area of the mine. The mine is not a recharge area for these strata (see Figure 4.4-1 and Appendix G). The Munger Canyon Mine is located updip of the t4cClane Canyon Mine, which suggests that the same situation will be the case. The rock strata within the permit and mine plan areas dip uniformly to the northeast at 2 degrees. No faults have been identified in the permit and mine plan areas of the Munger Canyon Mine, but two high angle faults form a graben structure into which the adjacent McClane Canyon Mine is developed. These faults may contribute to the equilibrium of ground water levels in the bedrock aquifers in the region. One set of entries in the McClane Canyon Mine encountered a fault on the south side of the graben structure in July of 1982. The fault produced water which reached a peak inflow rate of approximately 5.4 gpm during February of 1983. Since that time, the inflow rate has decreased to about 1.6 gpm recorded during the first quarter of 1985. Minor unmapped faults may be encountered by the mine at a future time and produce mine inflows. In order to monitor the effect of the operation on ground water resources and to assist in the prediction of hydrologic impacts of future permit terms, the following stipulation is required: Stipulation No. 3 THE APPLICANT MUST SUBMIT TO THE REGULATORY AUTHORITY AN ANNUAL REPORT CHARACTERIZING THE INFLOWS, DISCHARGES AND THE CONSUMPTION OF WATER WITHIN THE MINE. THIS REPORT IS TO INCLUDE A CURRENT MINE WORKINGS MAP SHOWING THE LOCATION AND QUANTITY OF INFLOWS: A TABLE KEYED TO THE MINE MAP WHICH SHALL CONTAIN THE SOURCE (i.e., FAULTS, FRACTURES, ETC.), QUANTITY, DURATION, AND QUALITY (i.e., pH, ELECTRO-CONDUCTIVITY AND TEMPERATURE) OF ALL NON-SEEP INFLOWS; A TABLE CONTAINING RECORDS OF WATER DISCHARGED FROM THE MINE, CONSUMED IN THE MINE AND IMPORTED FOR USE WITHIN THE MINE; A DISCUSSION OF THE WATER BALANCE WITHIN THE MINE; AND, A.PROJECTION OF HYDROLOGIC IMPACTS OF MINING IN THE UPCOMING YEAR. An alluvial ground water aquifer has been identified along East Salt Creek. Monitoring wells established in the alluvium indicate that alluvial water levels fluctuate seasonally in response to flow in East Salt Creek, which in turn fluctuates primarily in response to flow in tributary ephemeral streams. Data collected by the applicant from the Salt Creek alluvial aquifer thus far indicate a sodium-system, as would be expected. No significantly adverse affects on ground water resources are anticipated from the proposed underground mining activities.