2024-05-03_PERMIT FILE - C1980007 (2)

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2.05-77 Rev. 11/96- PR07; 04/06-PR10; 12/14- TR136, 04/24 – TR153 An additional well, SOM 128-H, was completed during the fall of 1990 to monitor the Rollins Sandstone beneath the B-Seam. Exhibit 12 contains the well completion information. SOM 128-H is located east of the West Elk Mine's new office and bathhouse and south of the new haul road (Map 34). Baseline data collection was obtained during the 1991 water year. The well was removed from the monitoring program in 1999 because the unusual hydrograph of the well was likely the result of well casing damage, and therefore, was not providing useful data. MCC plans to construct a monitoring well completed to the B-Seam, down-dip of the Box Canyon longwall panels. The well will be drilled prior to longwall mining panel 18 (the northern most Box Canyon panel). MCC will submit a revision to show the location of the well and to include it in the monitoring program, prior to beginning drilling. Typical Hydrologic Sampling Methods-Surface Water Surface water monitoring is measured seasonally as described on page 2.05-71. Monitoring measurements include measurement of flow, field parameters, and laboratory parameters as identified in Table 5. Surface water flow is measured through Parshall flumes (of varying throat widths and heights) at the continuous recording stations identified in the Surface Water Monitoring section of the permit document. Continuous recording is accomplished through use of Stevens Type F continuous recorders. In 1997, computerized data loggers were installed at all of the continuous recorders. The two Deep Creek sites and Middle Dry Fork have Global continuous recording devices (a different type and model of recorder from the ones installed at the Steven’s recorders). These were also installed in 1997. Field data is maintained and compiled at the West Elk mine office. Surface water monitoring sample measurements include field parameters, and laboratory parameters as identified in Table 5. Field parameters of temperature, pH, and conductivity, are procured at the surface water sampling point by selecting a grab sample volume from surface water flow and measuring the sample for the parameters using standard instruments which have been calibrated in the field daily. Samples for analysis of laboratory parameters are collected by filling a clean pre-fixed sample bottle from non-aerated flow. Sample bottles are capped, labelled, placed on ice, and transported to the laboratory for analysis. All equipment is rinsed before and after sampling with distilled water as well as sample water prior to measurement of sample parameters. Typical Hydrologic Sampling Methods-Springs Springs are measured seasonally as described on page 2.05-74. Monitoring measurements include spring flow, field parameters, and laboratory parameters. In sampling springs, a location is selected, which approximates a channel as closely as possible. A step may be cut into the channel base to facilitate positioning of the container measuring volume. Flow measurements are taken through the use of a timed volume approach. The field technician times the spring flow into a specific measured volume container, establishing flow rate. Several measurements are taken and averaged prior to reporting. Field parameters of temperature, pH, and conductivity are procured at the spring by selecting a sample volume from the flowing spring and measuring the sample for the parameters using standard instruments which have been calibrated in the field daily. Samples for analysis of laboratory parameters per Table 5 are collected by filling a clean, pre-fixed sample bottle from non-