2013-02-15_REVISION - C1981020 (2)

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2) Water quality samples of East Salt Creek will be collected quarterly at sites SW -1, SW -4 and SW -8. SW -8 is located between McClane and Munger Canyons on East Salt Creek. SW -4 is located downstream of the confluence of Munger Creek on East Salt Creek. Water quality samples will also be taken on Munger Creek and its tributaries at sites SW -3, SW -6 and SW -7 twice a year; once during spring snow melt and once during a storm event (spring or summer). 3) Surface water samples will be chemically analyzed for the 23 parameters specified in the "Full Suite For Active Mining List ", in Table 2.5 -2 of the permit application. 4) The results of all monitoring will be submitted to the Division immediately following receipt of analytical results. Monitoring results and summary, along with a report addressing mine inflows, discharges, and consumption in the mine will also be included in an annual hydrological report submitted each year, structured around the normal "water year" (October 1 through September 30). 5) During periods of temporary cessation of operations at the Munger Canyon Mine, items 1, 2, and 3 listed above are modified as follows: Water quality samples will be limited to quarterly samples from SW -3. Surface water samples will be analyzed for the 8 parameters listed in the "Short Suite For Temporary Cessation List", in Table 2.5 -2 of the permit application. Ground Water The ground water monitoring program is addressed in Section 2.6 of the application text, the parameter list is presented in Table 2.5 -2, and monitoring site locations are shown on Figure 2.3 -5. Adequate baseline data characterizing the hydrogeology of the permit and adjacent areas was provided in the original permit application, summarized in Section 4.4 of the application text. Drilling in the area indicates the presence of a saturated zone within the Cameo seam (Figure 4.4 -1). Data indicates that the Carbonera seam, which overlies the Cameo seam, also becomes progressively saturated to the northeast of the five -year permit area. The zone of saturation in the Cameo seam is probably recharged at the point where the Cameo seam subcrops below the East Salt Creek alluvium, approximately three miles upstream of the mine Very little recharge of water in coal seams and sandstones occurs along the outcrops due to the low annual precipitation rate (8.8 inches) and the steep slopes, which favor runoff over infiltration. The applicant did not establish monitoring wells in strata overlying the underground mine workings prior to mining. This was due to the relative inaccessibility of the characteristically steep terrain within the mine area to truck- mounted drill rigs. Previous exploration drill holes in the area of the McClane Canyon Mine have been dry to a depth in excess of 200 feet 20