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Mountain Coa(Compnny 2000 Annual Hydrology Report West E!k Mine • Hydrologic Monitoring Activities Surface Water Monitoring Prior to WY00, two surface water stations-Upper Gribble Gulch and West Gulch, East of Horse Gulch-were removed from the monitoring program as pari of TR88. No new surface water stations were added during VV1'00. All surface water stations were monitored as part of the regular program since baseline had been established. The locations of all surface water monitoring stations are shown on Map 2. Field water quality samples were taken three times during the water year 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 parameters 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 standard instmments that were calibrated in the field. Samples for analysis of laboratory parameters 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 WY00, twenty-four springs were included in the West Elk Mine monitoring program (Map 2). Table 2 lists the springs and groups the springs into four broad categories: (1) springs above the F-Seam in [Ire 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 ~~-ater quality samples were taken three times during the water year at all stations that were flowing. On an annual basis, all stations were sampled and the samples were analyzed for a full suite ofparameters (Table 2}. As part of Technical Revision No. 88, approved in August 1999, seventeen springs were removed from the monitoring program prior to the beginning of the water year. No new springs were added to the monitoring program during WY00. While baseline monitoring continued on spring I 1-2, all other springs were monitored as pari of the regular program. • 831-032.550 Page 5 Wright Water Engineers