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Mountain Coal Company 1999 Annual Hydrology Report West Elk Mine • Hydrologic Monitoring Activities Surface Water Monitoring )n WY99, the surface water-monitoring program remained essentially the same as during WY98. No new surface water stations were added during WY99. All surface water stations were monitored as part of the regulaz program since baseline had been established. The locations of all surface water monitoring stations aze shown on Map 2. Field water quality samples were taken three times during the water yeaz at all stations when sufficient flows were present. On an annual basis, all stations were sampled and the samples were analyzed for a full suite of parameters (Table 1). Sampling Methods Surface water monitoring was conducted seasonally. Monitoring measurements included flow, field parameters, and laboratory pazameters as identified in Table 1. Surface water flow was measured through Parshall flumes of varying sizes at the continuously recording stations identified in Table 1. Continuous recording is done with Stevens Type F recorders and dataloggers. Temperature, pH, and conductivity were obtained at each surface water sampling station by selecting a grab sample volume from surface water flow and measuring the sample for the parameters using standazd instruments that were calibrated in the field. Samples for analysis of laboratory pazameters were collected by filling a clean pre-fixed sample bottle from non-aerated flow. Sample bottles were • sealed, labeled, placed on ice, and transported to the laboratory for analysis. All equipment was rinsed before and after sampling with distilled water, as well as sample water, prior to measurement of sample parameters. Seeps and Springs Monitoring During WY99, forty-one springs were included in the West Elk Mine monitoring program (Map ?). Table 2 lists the springs and groups the springs into four broad categories: (])springs above the F-Seam in the North Fork drainage basin; (2) springs in or below the F-Seam in the North Fork drainage basin: (3) springs and other water resources above the B-Seam in the Jumbo Mountain area in the North Fork drainage basin; and (4) springs above the E-Seam in the Dry Fork drainage. Field water quality samples were taken three times during the water yeaz at all stations that were flowing. On an annual basis, all stations were sampled and the samples were analyzed for a full suite of parameters (Table 2). As part of Technical Revision No. 88, approved in August 1999, seventeen springs were removed from the monitoring program as indicated in Table 2. One new spring (11-2) was added to the monitoring program during WY99. While baseline monitoring was initiated on spring 1 1-2, all other springs were monitored as part of the regular progam. • 831-031.510 Pages Wright H'arerEngineers