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Mountain Coa( Company 1999 Annual Hydrology Report West E!k Mine <br />• MCC, in cooperation with the U.S. Forest Service District Office in Paonia, Colorado, has ageed to <br />informally monitor the U.S. Forest Service surface water resources, as depicted on Map 3, that are <br />located directly over panels to be mined, and within the angle-of--draw per the ageement letter in <br />Exhibit 19C of the permit. These resources are listed in Table 3. <br />Sampling Methods <br />Monitoring included spring flow, field parameters, and laboratory parameters. )n sampling springs, <br />a location was selected which approximated a channel as closely as possible. A step may have been <br />cut into the channel base to facilitate positioning of a container. Flow measurements were made by <br />the timed volumetric method: where a field technician times the filling of a container of known <br />volume to determine the flow rate. Several measurements were taken and averaged prior to <br />reporting. Field parameters of temperature, pH, and conductivity were made at the springs by <br />collecting a sample from the flowing springs and measuring the sample for the parameters using <br />standard instruments that were calibrated in the field. Samples for analysis of laboratory parameters <br />per Table 2, Footnote 2 were collected by filling a clean, pre-fixed sample bottle from non-aerated <br />spring flow. Care was taken to minimize any increases in turbidity. Sample bottles were sealed, <br />labeled, placed on ice, and transported to the laboratory for analysis. <br />Groundwater Monitoring <br />There were twenty-six wells in the WY99 goundwater monitoring program and are summarized in <br />Table 4 along with the formation each of the wells monitor. Table 5 provides more detail on the <br />• completion of each of the wells in the monitoring progam. Wells RPE-1 and RPE-7 were added to <br />the monitoring progam to monitor shallow goundwater levels near the refuse pile expansion. <br />Since well RPE-7 was completed at the end of September 1999, no data were obtained from the <br />well during WY99. Of the twenty-six monitored wells, only well RPE-1 was monitored to establish <br />baseline conditions during WY99; all other wells were monitoring as part of the regular progam. <br />In August ] 999, the Division approved Technical Revision No. 88, which removed nine wells from <br />the monitoring. Consequently, monitoring of wells SW-1, SW-2, SW-3, SW-4, SW-5, SW-6, <br />SOM-C-72-H, SOM-128-H, and SO.W-3 ceased in August 1999. <br /> <br />Field water quality samples were taken three times during the water year at all stations if sufficient <br />volume was present to fill the appropriate sample containers and if the well allowed access to the <br />formation of completion. On an annual basis, all stations were similarly sampled and the samples <br />were analyzed for a full suite of parameters (Table 4), when conditions allowed. <br /> <br />83 /-032.520 Page 8 Wright Water Engineers <br />